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16-101443
CITY OF �. Federal Way CITY HALL 33325 8th Avenue South Federal Way, WA 98003-6325 (253) 835-7000 www. cityoffederalway.. com Jim Ferrell, Mayor May 12, 2016 Mr. Ken Miller Lakehaven Utility District PO Box 4249 Federal Way; WA 98063-4249 FILE Re: File #16-101443-00-AD; CRITICAL AREAS PARTIAL EXEMPTION DETERMINATION Lakehaven Utility District Cold Creek Project, Parcel #1862700470 Dear Mr. Miller: On March 24, 2016, the City of Federal Way received the Request for Administrative Decision and supporting documentation for a Critical Areas Partial Exemption for the Cold Creek Sanitary Sewer Trunk Line Crossing Project on King County Parcel #1862700470. Per Federal Wray Revised Code (FWRC) 19.145.120: 19.145.120, "Partial Exemptions" "The following activities are partial exemptions to the provisions of this chapter and require written approval from the director. "(1) Essential public facilities, public utilities and other public improvements. The director may permit the placement of an essential public facility, public utility or other public improvements in a critical area if no practical alternative with less impact on the critical area(s) exists. The specific location and extent of the intrusion into the critical area must constitute the minimum necessary encroachment to meet the requirements of the public facility or utility and not pose an unreasonable threat to the health, safety, or welfare on or off the subject property. The intrusion shall attempt to protect and mitigate impacts to the critical area function and values. The "public utility and other public improvements" shall not include improvements whose primary purpose is to benefit a private development, including without limitation interior roads or privately owned detention facilities installed within or during the construction of a residential subdivision, binding site plan, or other commercial development. The director may require supporting documentation to demonstrate compliance with partial exemptions...." The proposed project area is located along Cold Creek within a forested ravine. The project description is as follows: For several years prior to November 2015, a 24-inch cast iron sanitary sewer pipe crossing Cold Creek was exposed. In the exposed condition, the sewer pipe functioned as a weir and was vulnerable to damage and failure due to undermining, falling trees, and landslides. Since failure of the pipe would result in significant environmental impacts resulting from spillage of raw sewage into the Mr. Ken Miller Page 2 May 12, 2016 creek, the Lakehaven Utility District was in the process of preparing maintenance plans to adequately protect the pipe. Significant storm events in November 2015 resulted in high stream flows and movement of woody materials, which in turn, helped to rebury the pipe with sediments. However, since the materials covering the pipe are considered unstable and temporary, the Lakehaven Utility District decided to proceed with preparing plans to permanently protect the pipe with a rounded - rock streambed substrate mixture thai is formulated to be stable under conditions of high flows. Woody materials including logs, root wads, and limbs will also be included in the materials used to re-form the channel. Prior to in -stream work, fish will be removed and excluded from Cold Creek and stream flow will be temporarily diverted. The plans have been designed to enable fish passage, even with the steep gradient. It is the intent of the proposed project to leave the pipe and existing materials covering the pipe in - place, with the addition of supplemental material as described above. However, should the sewer line become re -exposed due to natural action prior to construction, additional protection will be provided to the pipe by placing a steel casing around it, or providing additional pipe joint support, and then ensuring sufficient cover and placing the streambed rock mixture extending downstream as described above. There is an additional 8-inch sewer cast iron lateral from the southwest that serves the 4th Avenue cul-de-sac. The sewer lateral connects to the sewer manhole on the southwest side of the creek crossing. Running parallel to the sewer lateral is an 18-inch storm drain that drains into Cold Creek. It is apparent that some years ago the lower part of the storm drain became dislodged, causing undermining of the sewer and storm drain pipes. Both pipes were temporarily stabilized. This project proposes to permanently stabilize the 8-inch sewer pipe by adding quarry spall fill over the sewer pipe, surfaced with rounded gravel and cobbles, and to stabilize the storm drain main by adding additional pipe anchors. The partial exemption includes the following critical areas and portions of their buffers: Cold Creek, Wetlands A and B adjacent to the creek, and the geologically hazardous areas (erosion and landslide hazards) on parcel #1862700470 in the vicinity of the proposed project. The submitted mitigation plan is contained within the CriticalArea Report, Cold Creek Exposed Sewer Trunk Line Cover and Stabili.Zation (March 2016), prepared by The Watershed Company. The plan notes that mitigation sequencing was implemented to ensure impacts were avoided, minimized and mitigated to the greatest extent possible. The report states, "...a mitigation plan is proposed to ensure there is no net loss of ecological functions and values as a result of the project. The proposed mitigation plan will compensate for limited vegetation impacts through removal of invasive species and installation of a diverse mix of native trees, shrubs and groundcover species that are suitable for the area. Stream modification may also result in improved fish access and habitat due to installation of woody debris. A 57year maintenance and monitoring plan will help ensure the success of the project long term." The city reviewed the request and supporting documentation in conjunction with applicable sections of FWRC 19.145, and finds that continued placement of the existing public utility in the critical areas qualifies for a partial exemption as no practical alternative with less impact on the critical areas exists. The specific locations and extent of the intrusions into the critical areas constitutes the minimum necessary encroachment to meet the requirements of the public utility and not pose an unreasonable threat to the health, safety, or File #16-101443-00-AD Doc. I.D. 73234 Mr. Ken Miller Page 3 May 12, 2016 welfare on or off the subject property. The intrusions protect and mitigate impacts to the critical areas function and values. The public utility does not include improvements whose primary purpose is to benefit a private development. Supporting documentation was submitted to demonstrate compliance with the partial exemption. In accordance with FWRC 19.145.120.1, the partial exemption request and mitigation plan are approved. Should you have any questions about this letter contact Senior Planner Stacey Welsh at 253-835-2634, or s tacgy.welsh@cirvo ffederalxvay. eom. Sincerely, Isaac Conlen, Planning Manager for Scott Sproul, Acting Community Development Director c: Stacey Welsh, Senior Planner Ann Dower, Senior Engineering Plans Reviewer Doc I.D. 73234 File #I6-101443-00-AD Stacey Welsh From: Ken Miller <kmiller@lakehaven.org> Sent: Tuesday, April 19, 2016 3:58 PM To: Stacey Welsh Cc: 'Greg Johnston' Subject: RE: Cold Creek project (16-101443-AD) Attachments: Cold Creek Geotechnical Report.pdf Stacey No appeals filed. We did talk to the tribes . Soils report attached March 2016. If you need any additional information let me know. Ken From: Stacey Welsh [mailto:Stacey.Welsh*cityoffederalway.comj Sent: Tuesday, April 19, 2016 3:37 PM To: Ken Miller Subject: Cold Creek project (16-101443-AD) Ken, Were any SEPA appeals filed on Lakehaven's SEPA determination for the Cold Creek project? Also would you send over a copy of the geotechnical report (Robinson Noble, Inc. February 2016)? The Critical Areas partial exemption needs to cover the stream, wetlands, and the geo-hazard areas. Thank you, Stacey Welsh, AICP Senior Planner enr a Federal Way 33325 81h Avenue South Federal Way, WA 98003-6325 Phone:253/835-2634 Fax: 253/835-2609 www.cityoffederalway.com The contents of this email may be determined to be a public record and subject to disclosure pursuant to RCW 42.56 regardless of any expectations or claims of confidentiality or privilege asserted. GEOTECHNICAL ENGINEERING REPORT COLD CREEK SANITARY SEWER TRUNK LINE PROJECT FEDERAL WAY, WASHINGTON FOR LAKEHAVEN UTILITY DISTRICT MARCH 2O16 r ROBINSON NOBLE March 2, 2016 Mr. Ken Miller Lakehaven Utility District PO Box 4249 Federal Way, Washington 98063 Geotechnical Engineering Report Cold Creek Sanitary Sewer Trunk Line Project 515 South 288th Street Federal Way, Washington RN File No. 1529-056C Dear Mr. Miller: This letter serves as a transmittal for our geotechnical engineering report for the sewer crossing Cold Creek upstream and southeast of the Redondo Treatment Plant. The proposed creek improvements will provide additional protection for the existing 24-inch sewer main that crosses Cold Creek and the existing 8-inch sewer located in a steep hillside ravine to the southwest of the crossing. We evaluated and discussed several options to improve the existing conditions. Lakehaven Utility District has selected the option to raise the creek bed to create a gradient that allows cover over the existing pipe. Our intent with the addition of creek friendly various -sized rock and trees is to improve and stabilize the existing natural cover over the 24 inch pipe. We appreciate the opportunity of working with you on this project. If you have any questions regarding this report, please contact us. Sincerely, Rick B Powell, PE Principal Engineer RBP:am Three Figures 2105 South C Street 17625 1301" Avenue NE, Suite 102 Tacoma, Washington 98402 www.robinson-noble.com Woodinville, Washington 98072 P: 253 475.7711 1 F: 253.472.5846 P: 425.488.0599 1 R 425.488.2330 Table of Contents INTRODUCTION ......... .................. --......................... '....... ...... ...................................... ............. ........... � PROJECT HISTORY ................................. ....................... --.—_~--.---.--,.,—.--_—_—____.. � PROJECT OESCR|PTK]N-----_...--,~.~--,-------------.---'_-~--___.----u ScopeofVVork---.------------.--..-....__---'—_----'--'—_~-----~—.-2 SITECONDITIONS ....................................................................................................................................... x SurfaceConditions ................... ..'.......... ................................................... —......... ........................... 3 Geology.-------'—.---.-------.----.—'''--'.~~-~-----_'---'--u Slope Reconnaissance and Explorations ................................................................................................ 4 HydrologicConditions ............................................................................................................................. 5 Landslide and Seismic Hazards .............................................................................................................. 5 CONCLUSIONS AND RECOMMENDATIONS ............................................................................................ O General-------..... ....... --... ................................................................................................. .... 0 24-nchSewer Crossing ............................................................................. ............................................. DesignFlow Events and Rack Sizing .............. ............ _.... .--.. ......... ....................................... / Rebuild Creek Bed Gradient ........................................ ....................................... .... ,,_...... u LogoRoot wads and Anchors .................................................. .......................................................... 8 ConstructionAccess ......................................................................................................... ................... 8 O-innhSewer ............................................................................................................................................. u Repair........ .................................................... ........ ......................... ~..................... ........................ 8 USEOFTHIS REPORT ................................................................................................................. ............... e Robinson Noble, Inc INTRODUCTION This report presents the results of our geotechnical engineering investigation for a 24-inch sewer main crossing Cold Creek southeast of the Redondo Treatment Plant. The treatment plant is located at 515 South 28811 Street in Des Moines, Washington, as shown on the Vicinity Map, Figure 1. The trunk line project is within the City of Federal Way, upstream and southeast of the treatment plant. You requested that we complete this report to evaluate subsurface conditions and provide recommendations for repairs necessary to extend the design life of the 24-inch sewer main crossing Cold Creek. At the start of our study, about one half of the 24-inch pipe was exposed within Cold Creek because of down -cutting scour from the creek's flow. There is also an 8-inch line that connects to the 24-inch main that has been uncovered because of scour/erosion within the steep slope. This scoured ravine is located to the southwest of the 24-inch creek crossing. Recently during heavy rain -storm events, the pipe was covered with sediment as a result of the natural process of the creek. PROJECT HISTORY The Redondo Treatment Plant is located within a ravine with steep side slopes. A perennial stream, Cold Creek, is located at the base of the ravine and flows from southeast to northwest, discharging into Puget Sound. The creek flows all year from natural springs and seeps that are located within the ravine. Cold Creek enters a 72-inch, 250-foot long concrete culvert that flows beneath the southwestern portion of the treatment facility, discharging into Puget Sound downstream of the culvert outlet after passing through an off -site residential area. The 24-inch diameter sewer main trunk line extends down most of the western side of the drainage ravine. A system of concrete maintenance hole structures connect the gravity running sewer main until the line eventually must cross Cold Creek, approximately 275 feet upstream of where the creek enters the concrete culvert at the plant. The 24-inch cast-iron pipe is 66 feet long at the crossing and is attached to concrete maintenance hole structures. The cast-iron pipe has mechanical joints at the connections. There is also an 8-inch sewer line that connects to the south maintenance hole. The 8 inch sewer line is also undermined due to scour and erosion of the steep slope. The undermining is most likely from scour from the breakage of the parallel storm drain system that discharges into Cold Creek near the sewer crossing. The 8- inch line has a restrained joint and is currently being supported by a temporary jack system on a shallow foundation. We understand that Lakehaven Utility District many years ago completed some slope stabilization measures to protect the sewer crossing. Details of the repair are unknown, but we expect this was some type of emergency measure to reduce or avoid damage to the sewer crossing. We have also been mapping the upper reaches of the creek for seeps and stream flows as part of the Oasis Project. Although we are mapping seeps, we are aware of some local "shallow" landslides within the ravine. These shallow landslides could impact or hinder the flow of Cold Creek. We understand that on occasion the creek stops flowing because of landslide events that have dammed up the water. Recently, about one half of the pipe was exposed within Cold Creek because of down -cutting scour from the creek's flow. However, during recent heavy rains and high flows, we expect logs and rocks moved in a manner to allow a build-up of sediment to recover the pipe. Robinson Noble, Inc. Geotechnical Engineering Report Cold Creek Sanitary Sewer Trunk Line Project Federal Way, Washington March 2, 2016 RN File No. 1529-056C Page 2 Therefore, the pipe is currently covered but the gradient of the stream has increased significantly immediately downslope of the pipe. PROJECT DESCRIPTION The District plans to repair the area where the pipe was previously exposed by leaving the materials in -place that have naturally built-up around the pipe and rebuilding the creek bed gradient by flattening the grade to 16%. The rebuilding of the creek bed gradient will consist of adding free draining rock and logs. The diameter of the rocks will range up to 36+ inches. The logs are to be attached to the ground using anchors. Estimates of the fill depth are 4 to 5 feet. The width of the channel will be approximately 16 feet as designed by our subconsultant The Watershed Company. To be fish friendly, The Watershed Company has also included in their design, logs approximately 16 inches diameter anchored into the underlying hard silt. Some of the root wads may be up to 6 feet in diameter. Our subconsultant LPD Engineering, PLLC has completed an estimate of the peak flows for various flow events, as shown in their Technical Memorandum, dated October 14, 2015. It is our design intent to size the creek material for the 100-year event if possible. Therefore, the flow from Cold Creek over the sewer crossing is estimated to be 108.2 cubic feet per second (cfs) and the flow from 41h Avenue is 9.6 cfs. We have utilized these flow rates in our geotechnical design analyses to determine the size of rock needed to withstand the dynamics of the creek. A temporary road, through a small portion of wetland and steep slope area, will be constructed to allow construction equipment to reach the repair location. We understand that Lakehaven Utility District has consulted with a couple contractors and they both feel that the site can be accessed from the northeast, which is down a steep slope from the access roadway. Special equipment such as spyder excavators may be needed. The contractor is to restore the area as they remove their equipment from the site once the repairs are finished according to restoration plans provided by The Watershed Company. Scope of Work We completed our work by performing a preliminary geotechnical assessment of the sewer main crossing Cold Creek. The scope of services provided by Robinson Noble includes the following: ■ Review available reports, documents, photos, and geologic maps for the site. • Conduct a site reconnaissance of the soil and groundwater conditions in the area of the sewer main crossing. ■ Evaluate pertinent physical and engineering characteristics of the soils encountered within the area of the site reconnaissance. ■ Evaluate the steep slopes and comment on potential impacts based on the repair alternatives. Retain consultants whose specialty is wildlife, fisheries, and stream mitigation and civil design. Robinson Noble, Inc. Geotechnical Engineering Report Cold Creek Sanitary Sewer Trunk Line Project Federal Way, Washington March 2, 2016 RN File No. 1529-056C Page 3 Attend meetings with Lakehaven Utility District (District) to identify potential alternatives for the creek crossing repair. Prepare a geotechnical report with recommendations for geotechnical design elements of the project. This study is not intended to address the stability of the upper reaches of the ravine slopes. We have also discussed several different types of crossings with Lakehaven Utility District and with the local agencies. It was determined that that the most feasible and fish friendly alternative would be to rebuild the creek gradient in a manner to resemble a natural creek. SITE CONDITIONS Surface Conditions The Redondo Treatment Plant is located .within the Cold Creek drainage in Des Moines and Federal Way, Washington. Cold Creek extends from the northern section of Federal Way down a ravine to the final discharge point along the Redondo shore into Puget Sound. The treatment plant is located on a southern facing and northeastern side bench within the mid to lower portion of the drainage ravine. The topography of the drainage ravine varies from very steep slopes to flat level benches. Cold Creek is partially fed by springs that seep from the surrounding slopes. We understand that the creek may or may not flow during the dry -summer months based on the current elevations of natural groundwater levels of the nearby slopes. In the past few years the groundwater levels are within about 10 feet of record highs; therefore, Cold Creek has been flowing throughout the year. It appears that Class A sized WSDOT Standard Specification 9.13.4 quarry rock has been placed in the creek sewer crossing area to provide armor cover for the pipe and reduce erosion of the ravine side slopes. The relatively large quarry rock has moved/shifted downstream by the dynamic water forces. This movement is an indicator of the high creek velocity during larger storm events. Geology Most of the Puget Sound Region was affected by past intrusion of continental glaciation. The last period of glaciation, the Vashon Stade of the Fraser Glaciation, ended approximately 14,000 years ago. Many of the geomorphic features seen today are a result of scouring and overriding by glacial ice. During the Vashon Stade, areas of the Puget Sound region were overridden by over 3,000 feet of ice. Soil layers overridden by the ice sheet were compacted to a much greater extent than those that were not. Part of a typical glacial sequence within the area of the site includes the following soil deposits from newest to oldest: Artificial Fill (af) — Fill material is often locally placed by human activities, consistency will depend on the source of the fill. The thickness and expanse of this material will be dependent on extent of fill required to grade land to the desired elevations. Density of the fill will depend on earthwork activities and compaction efforts made during placement of the material. Robinson Noble, Inc. Geotechnical Engineering Report Cold Creek Sanitary Sewer Trunk Line Project Federal Way, Washington March 2, 2016 RN File No. 1529-056C Page 4 Mass -wastage deposits (QMW) — These deposits were derived from landslides. Undifferentiated colluvium, soils and landslide debris having indistinct morphology. Alluvial fan deposits (Qf) — boulders, cobbles, gravels, and sand deposited in lobate form where streams emerge from confining valleys and where the reduced gradient causes the sediment load to be deposited. Recessional Outwash (Qvr) —These deposits were derived from the stagnating and receding Vashon glacier and consist of mostly of stratified sand and gravel, but include unstratified ablation and melt -out deposits. Recessional deposits were not compacted by the glacier and are typically not as dense as those that were. Recessional Coarse -grained Lacustrine Deposits (Qvrs) — Similar to recessional outwash but generally coarse -grained sand deposited by streams into ice -dammed lakes during ice recession. Vashon Till (Qvt) —The till is a non -sorted mixture of clay, sand, pebbles, cobbles and boulders, all in variable amounts. The till was deposited directly by the ice as it advanced over and eroded irregular surfaces of previously deposited formations and sediments. The till was well compacted by the advancing glacier and exhibits high strength and stability. Drainage is considered very poor in the till. Advance Outwash Deposits (Qva) — Well bedded sand and gravel deposited subaqueous or by streams and rivers in front of the advancing ice sheet. Older Glacial Deposit- Coarse -grained (Qpogc) — Predominately sand and gravel deposits. This is a Pre -Olympia "Pleistocene" age deposit. Older Glacial Deposit - Fine-grained ((Qpogfl — Predominately silt and clay deposits. This is a Pre -Olympia "Pleistocene" age deposit. The geologic units for this area are mapped on the Geologic man of the Poverty Bay Quadrangle, King and Pierce Counties Washington by D.B. Booth, H.H. Waldron, and K.G. Troost (2004). The site is mapped in the area of the sewer crossing Cold Creek as being underlain by the older glacial fine-grained deposits, as shown in Figure 2. Mass wastage deposits extend off the upper slopes and up the narrow drainage ravine valley northern sidewalls. Recessional and advance outwash deposits were mapped along the upper ravine sections of the site. The map also shows the alluvial fan deposits extending out from the discharge along the Redondo shoreline of the cold creek drainage. The alluvial fan is evidence that mineral soil is migrating out of the ravine during storm events. Our site observations and explorations generally encountered the Recessional coarse -grained lacustrine deposits, recessional outwash, and older glacial fine-grained deposits. Slope Reconnaissance and Explorations We completed a site reconnaissance in the area of the creek crossing. We used a shovel to dig shallow explorations and to observe exposed soil conditions within the cut banks. The creek is cutting into undisturbed silt and clay layers that we interpret as the older glacial deposits described in the Geology subsection of this report. We observed what appear to be previous Robinson Noble, Inc. Geotechnical Engineering Report Cold Creek Sanitary Sewer Trunk Line Project Federal Way, Washington March 2, 2016 RN File No. 1529-056C Page 5 graded trails completed for the construction of the sewer utility and for maintenance. We expect some fill was used to create the access trails. During our reconnaissance, we observed a surface slide located northeast of the creek crossing. We observed that some of the wet, soft slide debris is deposited on some of the trail areas. The slide appears to be a relatively shallow surface type failure. Hydrologic Conditions Cold Creek runs from south to northwest from Easter Lake at an elevation of 425 feet above sea level through a narrow urban corridor to a concrete culvert just north of Dash Point Road. This concrete culvert runs below the Marine Hills Swim Club downstream approximately 1,000 feet to an elevation of approximately 200 feet above sea level. This section of the stream channel from Easter Lake to the culvert discharge is typically a dry ephemeral stream that is only active during rainfall events. Just below the culvert discharge, small springs and seeps appear that make Cold Creek a perennial channel and water flows year round to the discharge into Puget Sound on Redondo Beach. Coldbrook Spring is a tributary to Cold Creek that appears as a spring out of the eastern side of the drainage ravine at an elevation of approximately 162 feet above sea level. This spring was used in the past as a major source of drinking water for the surrounding area until the late 1970's. In 1986, flow from the spring was no longer visible at the discharge location. The spring reappeared in 1999 with a very light volume of discharge, but was dry again by 2001. Between September 2011 and April 2012, the spring had recharged and was flowing again. Based on Robinson Noble work on the Oasis Project, it was determined that the spring is a discharge point for the Mirror Lake Aquifer. Work on the Oasis project also provides that both the Redondo Milton Channel (RMC) and the Mirror Lake Aquifer (MLA) contribute most of the water for the flow of Cold Creek. Due to the increased flow of Cold Creek, and the moderate inclination of the drainage, the sewer crossing is acting like a weir thus scour is occurring below the pipe crossing. While seasonal conditions will affect the volume of flow and scour of Cold Creek, the RMC and the MLA will directly affect the volume of water being emitted from springs. Landslide and Seismic Hazards The Cold Creek drainage ravine extends down and through very steep slopes and variable soil conditions that are extremely susceptible to surface slides and potentially deep seated landslides. We observed a relatively straight evergreen and deciduous second to third growth forest on the southern to western side of the drainage without signs of recent movement. However, the northern to northeastern side has barren sections in regards to tree growth and other evidence of recent slides in the last few years. We also observed multiple springs and seeps that are flowing year round north to northeast of the sewer crossing area. We expect an increase in the groundwater aquifers near the slope face will reduce slope stability and failures could occur more frequently now that the groundwater table has been restored. It is difficult to know how the slopes will perform with the higher groundwater levels and seepage. The past many years are not an adequate performance measure of how the slopes will perform because the groundwater level has been artificially lowered for drinking water and therefore improved slope stability for that period of time. Robinson Noble, Inc. Geotechnical Engineering Report Cold Creek Sanitary Sewer Trunk Line Project Federal Way, Washington March 2, 2016 RN File No. 1529-056C Page 6 We have reviewed topographical, geological, and LIDAR maps of the ravine that provide visual evidence that large slides or a combination of many small to moderate events have occurred in the post glacial period. The geologic map also shows a large area of mass wasting, which is slide debris. We expect that similar slides will continue to occur with the current soil and groundwater conditions. There is also the potential of larger failures similar to the size shown on the geologic map and in the LIDAR data. These slides could impact the area of the creek crossing either in a more solid debris flow damming the creek, or a fluid type debris flow. Seismic events could also have an impact on the stability of the surrounding slopes. These events could cause a horizontal force that would decrease the slope stability to a level that triggers the slide event. There is also a potential that some liquefiable flow type failures could occur during a seismic event because of the groundwater pore pressure. CONCLUSIONS AND RECOMMENDATIONS General It is our opinion that the sewer pipe should not be left "as is" in a dynamic -creek environment, as it could result in unnecessary damage to the pipe and potential loss of effluent. Currently, we received an unexpected reprieve with the natural deposition conditions recovering up the existing 24 inch sewer pipe crossing. Nonetheless, the natural covering of the pipe has created a steeper gradient slightly downslope of the pipe and therefore the velocities have increased. We expect the recent natural covering of the pipe could be temporary and scour could and most likely will eventually expose the pipe again. To reduce the likelihood of emergency repairs, the District has requested that we continue with our design to improve the gradient of the creek. It has been decided by the District to leave the existing soil over the pipe in its current condition and requested we design the option of adding additional material to the creek bed which will lessen the creek gradient and help stabilize the natural covering over the crossing. The existing LIDAR data shows that this creek area has had some slide events especially on the northern slope. The noticeable slide conditions and the recent observation of shallow, smaller events show that this area is subject to landslides. We have also had reports in the past few years that the creek stops flowing on occasion. The lack of flow has been attributed to slides damming up the creek. Eventually the natural dam fails and the creek resumes its course and flow. From an engineering perspective, it is difficult and nearly impossible to predict the flow events after a breach in natural damming process. These potential higher flows could greatly increase the velocity and therefore provide additional scour to the area we are attempting to repair. This is a risk that cannot be accurately quantified. We have recommended additional rock size and anchored timbers in an effort to mitigate these issues. Another option would be to immediately investigate the creek if the stream stops flowing. This would be a prudent measure to control damage to the repaired creek and also the entire sewer treatment plant. We recommend that the existing buried maintenance hole on the northeast side of the creek crossing be uncovered during construction. Slide debris has covered up the maintenance hole. Robinson Noble, Inc. Geotechnical Engineering Report Cold Creek Sanitary Sewer Trunk Line Project Federal Way, Washington March 2, 2016 RN File No. 1529-056C Page 7 24-inch Sewer Crossing Design Flow Events and Rock Sizing: The design flow event is a critical element in estimating a stable creek channel. Significant creek velocities will cause the large boulders to move and therefore scour will continue. LPD Engineering has provided estimated peak flows for Cold Creek based on numeric modeling. Actual flow for peak events are unknown and not recorded by Robison Noble during our OASIS flow measurements. We have combined the Cold Creek Basin with the 4th Avenue South Basin and have utilized a design flow event of 118 cfs to estimate the size of the rock needed for the creek. We evaluated two methods for sizing the average rock size for the creek to be stable: • U.S. Department of Transportation Federal Highway Administration Hydraulic Engineering Circular No. 15, Third Edition: Design of Roadside Channels with Flexible Lining. The calculated average rock size is D50 = 2.05 feet with the planned conditions. This method is for sizing riprap rocks in a manner so they do not move down gradient. This method is not specifically for stream design. Water Crossing Design Guidelines rearranged JC Bathurst (Bathurst 1987) equations to determine the intermediate axis of the 8411 Percentile particle (D84) in the sediment distribution. The calculated average rock size is D50=0.50 feet with the planned conditions. This method also assumes sediment transport of similar size material. Even though there are cobbles and boulders upstream of the crossing, the average D5o in the natural creek is less therefore a factor of safety to reduce the larger rocks had to be placed in the design. We used a factor of safety of 2 on the average rock size using the JC Bathurst method, which the D50 would be 1 foot. Therefore, we have recommended the design D50 for this creek improvement should be 1 foot or larger. We have recommended the following rock sizes should be used for the creek: Rock Dimension (inches)* Rock Weight (%) 3/8 to 3 inches 15 3 to 6 inches 15 6 to 12 inches 15 12 to 18 inches 15 18 to 24 inches 15 24 to 36 inches 15 36+ inches 10 *The rock should be rounded rock, essentially free from fines and confirming closely to the percentages. The above sizes have been recommended with the understanding that some logs will be anchored into the earth eliminating the need for larger boulders. In our opinion the placement of larger boulders would be somewhat impractical. Robinson Noble, Inc. Geotechnical Engineering Report Cold Creek Sanitary Sewer Trunk Line Project Federal Way, Washington March 2, 2016 RN File No. 1529-056C Page 8 We recommend that the medium and larger rocks be buried in the fill section to reduce the impact from the dynamic forces of the creek. A more uniform flow is preferred with the largest creek width possible. We expect that the natural stream depositional process will adequately fill in the small voids of the rock, therefore, fine grained material and sand is not needed in the filling process. Rebuild Creek Bed Gradient: The Watershed Company describes rebuilding the appropriate grades and creek bed to span over the pipe. The creek gradient would be as steep as feasible to reduce the amount of rock and material imported into the sensitive site. The plan is to fill the creek to a gradient of approximately 16 percent with imported round rock. The rock would only cover the pipe as needed. The creek would have to be reestablished to create the ecosystem required by permitting agencies. This allows the pipe to be buried to reduce impacts from the environment. This will also reduce the continued downcutting of the creek in the area of the pipe, and therefore will improve the local stability. Given the need to protect the sewer line against damage, with associated environmental consequences, and working within difficult project area constraints, re-forming the creek bed to provide adequate pipe cover is considered to be the most practical and effective approach. Logs, Root wads and Anchors: The rebuilding of the creek bed gradient will consist of rock, logs and root wads. The diameter of the logs will be approximately 16 inches; the root wads will range up to 6 feet in diameter. The logs and root wads are to be secured into the ground using anchors. For this design we have recommend the use of two Manta Ray MR-3 earth anchors per log. Other anchors could be used but should be approved by the geotechnical engineer. Each anchor is to be driven a minimum of 7 feet into the ground and be set. We recommend a 5,000 pound tension load will be available with the anchor provided the above installation guidelines are followed. At least one anchor should be load tested to 200% of the design load. The load test should be completed in 25% increments until 200% is achieved. Only the 200% loading condition should be held for 10 minutes to confirm an acceptable creep deformation. Construction Access: The contractor should plan for the acceptable means and methods to import the material and equipment into the site for construction. The contractor will need to stay within the approved areas for construction and follow the specifications of the project. We have provided a detail in Figure 3 recommending the use of "Hog Fuel" for the construction road access with soil stabilization fabric. Use of clean crushed rock could also be used in place of the hog fuel. 8-inch Sewer Repair: The 8-inch pipe is functioning but we recommend that that pipe be supported by a mechanical system, such as pipe piles and a collar. We recommend that three sets of 2-inch pipe piles be installed with an acceptable collar to support the currently exposed sewer pipe. Each pipe pile will be driven with a 90-pound jack hammer until the refusal criteria of less than inch of movement is achieved in 60 seconds. This refusal criterion will support a load of approximately 2 tons per pile. Each set of piles will be connected in a manner to provide support to the sewer line. The pile on the downslope side of the pipe will be driven at an angle Robinson Noble, Inc. Geotechnical Engineering Report Cold Creek Sanitary Sewer Trunk Line Project Federal Way, Washington March 2, 2016 RN File No. 1529-056C Page 9 of at least 30 degrees to provide additional lateral support, The contractor will provide a detail, and receive approval, on the pipe pile/sewer line connection prior to installing, We recommend that quarry spalls, WSDOT Standard Specification 9-13.6, be placed below the 8-inch sewer pipe and compacted with the backhoe. The rock spalls will be placed in a manner to connect with the native slope conditions. The rock spalls should form a prism below the pipe with a wider bottom. The placement of the spalls should be approved and evaluated by the geotechnical engineer during construction. The pipe and spalls should be capped with similar material as used in the repair of the creek bed described above. We recommend the following rock size for the 4th Avenue ravine: Rock Dimension (inches)* I Rock Weight (%) 3/8 to 3 inches 25 3 to 6 inches 25 6 to 12 inches 25 12+ inches 25 We recommend at least 2 feet of cover of the rounded or subrounded river rock be placed in the area. We recommend that the material be placed in a manner where the permanent slope angles will be less than 2 Horizontal to 1 Vertical. This geometry may require that some of the parallel storm pipe is covered during placement of the fill. We also suggest that the installation of a log at the toe of the slope may help the toe stability. USE OF THIS REPORT We have prepared this geotechnical report for Lakehaven Utility District and their agents, for use in preliminary planning and design of this project. The report should be provided to prospective contractors for their bidding and estimating purposes, but our report, conclusions and interpretations should not be construed as a warranty of surface or subsurface conditions. The scope of our services does not include services related to construction safety precautions, and our recommendations are not intended to direct the contractors' methods, techniques, sequences or procedures, except as specifically described in our report, for consideration in design. There are possible variations in subsurface conditions, We recommend that project planning include contingencies in budget and schedule, should areas be found with conditions that vary from those described in this preliminary technical report. Within the limitations of scope, schedule and budget for our services, we have strived to take care that our services have been completed in accordance with generally accepted practices followed in this area at the time this report was prepared. No other conditions, expressed or implied, should be understood. •M Robinson Noble, Inc. Geotechnical Engineering Report Cold Creek Sanitary Sewer Trunk Line Project Federal Way, Washington March 2, 2016 RN File No. 1529-056C Page 10 We appreciate the opportunity to be of service to you. If there are any questions concerning this report or if we can provide additional services, please call. Sincerely, Robinson Noble, Inc. Kevin H. Biersner, EIT Staff Engineer Rick B Powell, PE Principal Engineer KHB:RBP:am Three Figures Robinson Noble, Inc. ATTACHMENTS �:� a'5254TH �i S?4OM ST id t r+ j : , N s:eisirr r �� L1'nridiannt ICENT Beitch � s fiarrr sr DES t� MOINES I srsr y . � k J e1 t X' Star Lake [� Si,; L -� Redoadn% 0. J Project Site 1 p ry e [IttennALL ,� N_ar•;r�r si - I _-�• ..�Z— r �'-_ 5.7617x 51'. C s �msr 1-<r��• �fpjo IT -108 _ rl iS1V.3Yi TH57 ! ` S 3t27H ST i z - --7 `r s•7irai sr o . I iIl r - D .v •� .4 rf1� t__ —V�4e _1 53Mi+f 5T 1: SNS 3Z4iN.S}' r l� _ i , lr ��6W 7i5iN Ae 1TnFRA 1, W.53 _I T7Y� % J` -3 �• Cry .f. Sr �+ Note: Basemap taken PM: RBp Figure 1 from Poverty Bay ROBINSON Quadrangle 7.5 minute March 2016 Vicinity Map series. USGS 2014. 1529-056C NOBLE I Lakehaven Utility District: Redondo Treatment Plant Creek Crossing AkL ICD LL O N U CD cl _ O 1 - �L I co m � m N O _ o �l - N �o O O �. N N�N CO O CL _ + O O .: • � � O N C r •''�' C Cl n C7 a •a Yin�Y O y C N C I ,•� E 00 o `r f Ur o� i m��� r m 1 ,1 N d U Y: p F a = Z w 2 f O W (n J m o °z CY) C E @ .o % ) e 3 U m L- m R $ o o n Q E CL) 2 2 ° cu B § � 2 k 2 0 C) Q m : / _0 0 / § R E 2 c ) \ _ 7 0 ® / 0 / Mn¢ \ § % ƒ / n @ 3 @ � � •x / � � s / 7cn � / § § > 0 > 2 / I 2 0= Q o a- @ o o :t� •- - @ m cc R (n q 2: @ 4- @ = � ' cn 0 E 2 m§ q 2 o X o E 2 R 3 v 7 } U) _ § 2 m 2 2 � 2 R cr R - R ® ° o \ § ) ) § � \ 3 t z - —�§ IIR O2 I Stacey Welsh From: Stacey Welsh Sent: Tuesday, April 19, 2016 3:37 PM To: 'Ken Miller' Subject: Cold Creek project (16-101443-AD) Ken, Were any SEPA appeals filed on Lakehaven's SEPA determination for the Cold Creek project? Also would you send over a copy of the geotechnical report (Robinson Noble, Inc. February 2016)? The Critical Areas partial exemption needs to cover the stream, wetlands, and the geo-hazard areas. Thank you, Stacey Welsh, AICP Senior Planner C fr Feqldelral Way 33325 8th Avenue South Federal Way, WA 98003-6325 Phone:253/835-2634 Fax: 253/835-2609 www.citvoffederalway.com King County Department of -Assessments: eReal Property Page 1 of 2 5irrtpic sign I_Ip an.:; sit t.: _ r131u s it r- asy P paypal it/r c�1s(on Icrs to �iaSr you:. Payloal credit processing ADVERTISEMENT New Seareh Property Taz Bill Map This Property Glossary of Terms Area Report Print Property Detail PARCEL DATA Parcel 186270-0470 Name FEDERAL WAY CITY OF Site Address Residential Area 052-011 (SW Appraisal District) Property Name Legal Description rCROWN POINT OPEN AREA PLat Block: Plat Lot: TRACT A Jurisdiction FEDERAL WAY Levy Code 1205 Property Type R Plat Block / Building Number Plat Lot f Unit Number TRACT A Quarter -Section -Township- Range NW-5 -21-4 LAND DATA Highest & Best Use As If Vacant SINGLE FAMILY Highest & Best Use As (unknown) Improved Present Use Vacant(Single-family) Land SgFt 527,631 Acres 112.11 Rainier Territorial Olympics Cascades Seattle Skyline Puget Sound Lake Washington Lake Sammamish Lake/River/Creek Other View Views Desionations Historic Site Current Use (none) Nbr Bldg Sites Adjacent to Golf Fairway NO Adjacent to Greenbelt NO Other Designation NO Deed Restrictions NO Development Rights Purchased NO Easements NO Native Growth Protection Easement NO DNR Lease IND Percentage Unusable 10 Unbuildable YES Restrictive Size Shape NO Zoning RS15.0 Water WATER DISTRICT Sewer/Septic PUBLIC Road Access PUBLIC Parking 1ADEQUATE Street Surface IPAVED Ware Rronr Waterfront Location Waterfront Footage 0 Lot Depth Factor 0 Waterfront Bank Tide/Shore Waterfront Restricted Access Waterfront Access Rights IND Poor Quality IND Proximity Influence INO Nuisances topography YES Traffic Noise Airport Noise Power Lines NO Other Nuisances INO Problama Water Problems IND Transportation Concurrency INO Other Problems IND Environmental Environmental NO BUILDING TAX ROLL HISTORY This is a government owned parcel. Change to state law (RCW 84, 40.045 and 84.40.175) by the 2013 Legislature eliminated revaluation of government owned parcels. http://blue.kingcounty.com/Assessor/eRealProperty/Detail.aspx?ParcelNbr=1862700470 3/30/2016 King County Department of Asses, ants: eReal Property Page 2 of 2 SALES HISTORY Excise Recording Document Sale Seller Sale Buyer Name Instrument Number Number Date Priee Name Reason KING CITY OF Warranty 118'097 199104230197 112/199, $0.00 COUNTY FEDERAL WAY Deed Other REVIEW HISTORY PERMIT HISTORY HOME IMPROVEMENT EXEMPTION New Search Property Tax Bill Map This Property Clus?;i� of Terms Area Report Print Property Detail im http://blue.kingcounty.com/Assessor/eRealProperty/Detail.aspx?ParceINbr=1862700470 3/30/2016 CITY OF FEDERAL WAY COMMUNITY DEVELOPMENT DEPARTMENT DEVELOPMENT REVIEW COMMITTEE TRANSMITTAL DATE: 3-30-16 TO: E.J. Walsh, Development Services Manager FROM: Stacey Welsh, Planning COMMENTS: Please provide any comments by 4-13-16. FILE NUMBER(s): 16-101443-00-AD RELATED FILE NOS.: None PROJECT NAME: LAKEHAVEN UTILITY DISTRICT PROJECT ADDRESS: Parcel #1862700470 ZONING DISTRICT: RS 15.0 PROJECT DESCRIPTION: Partial exemption to cover and protect a vulnerable sewer trunk line that crosses Cold Creek. LAND USE PERMITS: Administrative Decision PROJECT CONTACT: LAKEHAVEN UTILITY DISTRICT KEN MILLER PO BOX 4249 FEDERAL WAY, WA 98063 MATERIALS SUBMITTED: Request for Administrative Decision SEPA Determination SEPA Checklist JARPA Critical Area Report Plan set REQUEST�JR ADMINISTRATIVE DECISION CITY OF Federal Way MAR 2 4 2016 CITY OF FEDERAL WAY CDS COMMUNITY DEVELOPMENT DEPARTMENT 33325 814 Avenue South Federal Way, WA 98003-6325 253-835-2607;Fax 253-835-2609 www.cityoffedera(wgy.com FILE NUMBER I `� - O ✓ ' Date 3 Applicant NAME PRIMARY PHONE Ken Miller 253-946-9552 BUSINESS/ORGANIZATION ALTERNATE PHONE Lakehaven Utility District MAILING ADDRESS E-MAM 31627 1st Avenue South kmiller@alakehaven.org CITY STATE ZIP FAX Federal Way WA 98063 Property Address/Location Parcel # 1862700470 Lat: 47.3400710 Long:-122.329451 ° Description of Request This request is for a partial exemption pursuant to FWRC 19.145.120(1). This partial exemption is requested to authorize a proposal to cover and protect a vulnerable sewer trunk line that crosses Cold Creek. The proposed project will result in temporary minor impacts to Cold Creek, adjacent wetlands, adjacent steep slopes and associated buffers. A mitigation plan is proposed to ensure that there is no net loss in the functions and values of the impacted critical areas. List/Describe Attachments Document Number of Copies Critical Area Report 6 Mitigation Plan 6 JARPA I SEPA Checklist (Lead Agency: Lakehaven Utility District) 1 For Staff Use ❑ Code Interpretation/Clarification ❑ Critical Areas Letter/Analysis/Peer Review ❑ Request for Extension (Land Use/Plat Approval) ❑ Revisions to Approved Permit ❑ Tree Removal ❑ Zoning Compliance Letter Critical Areas Partial Exemption - No Fee - No Fee (Actual Cost if Applicable) - Check Current Fee Schedule - Check Current Fee Schedule No Fee Check Current Fee Schedule - Planning hourly fee Bulletin #079 — January 4, 2016 Page 1 of 1 k:\Handouts\Request for Administrative Decision LAKEHAVEN UTILITY DISTRICT DETERMINATION OF NONSIGNIFICANCE Cold Creek Sanitary Sewer Trunk Line Crossing Project Lakehaven Utility District MAR 2 4 Z016 P.O. Box 4249 Federal Way, WA 98063-4249 CITY OF FWERAL WAY DATE OF ISSUANCE: March 10, 2016 CDS DESCRIPTION OF PROPOSAL: For several years prior to November 2015, a 24-inch cast iron sanitary sewer pipe crossing Cold Creek was exposed. In the exposed condition, the sewer pipe functioned as a weir and was vulnerable to damage and failure due to undermining, falling trees, and landslides. Since failure of the pipe would result in significant environmental impacts resulting from spillage of raw sewage into the creek, the Lakehaven Utility District was in the process of preparing maintenance plans to adequately protect the pipe. Significant storm events in November 2015 resulted in high stream flows and movement of woody materials which, in turn, helped to rebury the pipe with sediments. However, since the materials covering the pipe are considered unstable and temporary, the Lakehaven Utility District decided to proceed with preparing plans to permanently protect the pipe. The designs supplement the existing cover materials by filling in 75 feet of stream channel downstream of the pipe with a rounded -rock streambed substrate mixture that is formulated to be stable under conditions of high flows. Woody materials including logs, root wads, and limbs will also be included in the materials used to re-form the channel. Prior to in -stream work, fish will be removed and excluded from Cold Creek and stream flow will be temporarily diverted. The plans have been designed to enable fish passage, even with the steep gradient. It is the intent of the proposed project to leave the pipe and existing materials covering the pipe in -place, with the addition of supplemental material as described above. However, should the sewer line become re - exposed due to natural action prior to construction, additional protection will be provided to the pipe by placing a steel casing around it or providing additional pipe joint support, and then ensuring sufficient cover and placing the streambed rock mixture extending downstream as described above. There is an additional 8-inch sewer cast iron lateral from the southwest that serves the 4t' Avenue cul-de-sac. The sewer lateral connects to the sewer manhole on the southwest side of the creek crossing. Running parallel to the sewer lateral is an 18-inch storm drain that drains into Cold Creek. It is apparent that some years ago the lower part of the storm drain became dislodged, causing undermining of the sewer and storm drain pipes. Both pipes were temporarily stabilized. This project proposes to permanently stabilize the 8-inch sewer pipe by adding quarry spall fill over the sewer pipe, surfaced with rounded gravel and cobbles, and to stabilize the storm drain main by adding additional pipe anchors. PROPONENT: Lakehaven Utility District LOCATION OF PROPOSAL: The proposed project is located along Cold Creek in a forested ravine within the City of Federal Way. Cold Creek is a direct tributary of Puget Sound; the project site is located about 1/3 of a mile upstream from the mouth of the creek. The project area is located in Section 5; Township 21 North, Range 4 East. The project site is about 275 feet upstream of the Lakehaven Utility District Redonda Treatment Plant, on the northeast corner of parcel #1862700470. THRESHOLD DETERMINATION: The lead agency for this proposal has determined that it does not have a probable significant adverse impact on the environment. An environmental impact statement is not required under RCW 43.21C.030(2)(c). This decision was made after review of a completed environmental checklist and other information on file with the lead agency. This information is available to the public on request. WRITTEN COMMENTS AND APPEALS: This Determination of Non -significance (DNS) is issued under the Lakehaven Utility District Resolution 84-984 and WAC 197-11-340(2). The lead agency (Lakehaven Utility District) will not act on this proposal for 15 days from the date of this DNS or date of legal notice, whichever is later. Comments must be submitted to the District by 4:30 pm on Thursday,March 315 2016. Unless modified by the District, this determination will become final following the comment deadline. Any person aggrieved of the District's final determination may file an appeal, along with the appropriate fling fee, within 15 days of date of the determination or of the date whenever any required notice is made, whichever is later; provided that if there are any state statutory requirements for appeals specified therein, such requirements shall control. Responsible official: Position/Title: Phone: Address: Publication Date: Comment Deadline Appeal Deadline: Staff Contact: Date 1 John Bowman, P.E. General Manager (253) 941-1516 P.O. Box 4249 Federal Way, WA 98063 March 16th, 2016 March 318t, 2016 March 315t, 2016 Ken Miller, P.E. Project Manager Phone Email: Sign Department of Community Development Services 33325 81' Avenue South PJKZIVM Federal Way, WA 98003- CITY OF 6325 253-835-2607; Fax 253- Federal Waywww. MAR 2 4 2016 835-2609 cit offederaEwa .corn Cri t OF FEDERAL WAY CDS SEPAENVIRONMENTAL CHECKLIST Purpose ofcheckbsr~ Governmental agencies use this checklist to help determine whether the environmental impacts of your proposal are significant. This information is also helpful to determine if available avoidance, minimization, or compensatory mitigation measures will address the probable significant impacts, or if an environmental impact statement will be prepared to further analyze the proposal. Instructions for applicants htlpj This environmental checklist asks you to describe some basic information about your proposal. Please answer each question accurately and carefully, to the best of your knowledge. You may need to consult with an agency specialist or private consultant for some questions_ You ruay use "rrat appkabk"or "does not app#"only 11lhenyou can explain u�hy it doer not *ply arfd riot 11i+ien the arrsrmris rnikwivir. You may also attach or incorporate by reference additional studies and/or reports. Complete and accurate answers to these questions often avoid delays with the SEPA process, as well as later in the decision miaki g process. The checklist questions apply to all parts ofyourpmpora4 even if you plan to do them over a period of time or on different parcels of land. Attach any additional information that will help describe your proposal or its environmental effects. The agency to which you submit this checklist may ask you to explain your answers or provide additional information reasonably related to determining if there may be significant adverse impact. Instructions for Lead Agencies: Additional information may be necessary to evaluate the existing environment, all interrelated aspects of the proposal, and an analysis of adverse impacts. The checklist is considered the first, but not necessarily the only source of information needed to mane an adequate threshold determination. Once a threshold determination is made, the lead agency is responsible for the completeness and accuracy of the checklist and other supporting documents. Use ofchecklistfornonprojectproposals: hel For nonproject proposals (such as ordinances, regulations, plans, and programs), complete the applicable parts of sections A and B, plus the SUPPLEMENTAL 5FIXT FOR NONPROlEQ: A-C—nO_NS_(p�rt n�. Please completely answer all questions that apply and note that the words "project;,' "applicant,,, and "property or site" should be read as "proposal," "proponent," and "affected geographic area," respectively. The lead agency may exclude (for nonprojects) questions in Part B (Environmental Elements) that do not contribute meaningfully to the analysis of the proposal. Bulletin #050 —May 1, 2014 Page 1 of 16 k:\Handouts\Environmental Checklist May 2014 A. BACKGROUND iid 1. Name of proposed project, if applicable: Cold Creek Sanitary Sewer Trunk Line Crossing Project 2. Name of applicant Djdp� Ken Miller, P.E. Engineering Manager 3. Address and phone number of applicant and contact person: Applicant: Ken Miller, P.E. Lakehaven Utility District 31623181 Avenue South, P.O. Box 4249 Federal Way, WA 98063 253-946-5405 253-941-1516 kmiller@Lakghaven.org Contact: Kenny Booth, AICP The Watershed Company 750 Sixth Street South Kirkland, WA 98033 425.822.5242 kb o oth(e).watershedco. cam 4. Date checklist prepared: Jelpp February la', 2016 5. Agency requesting checklist: Lakehaven Utility District 6. Proposed timing or schedule (Including phasing, if applicable): Construction involving in -water work (not including revegetation) is estimated to take approximately four weeks to complete. In -water work is proposed to occur in 2016, during the approved work window for streams, extending from July 16th through September 301s as listed generally by the Washington Department of Fish and Wildlife for King County Streams. Revegetation work will occur in the fall of 2016. 7. Do you have any plans for future additions, expansion, or further activity related to or connected with this proposal? If yes, explain. 1� No future activities are related to or connected with this proposal. 8. List any environmental information you know about that has been prepared, or will be prepared, directly related to this proposal. Robinson Noble, Inc. February 2016. Geotechnical Report The Watershed Company. February 2016. Critical Areas Report: Cold Creek Sanitary Sewer Trunk Line Crossing Project. The Watershed Company. February 2016. Biological Evaluation for Cold Creek Sanitary Sewer Trunk Line Crossing Project. 9. Do you know whether applications are pending for governmental approvals of other proposals directly affecting the property covered by your proposal? If yes, explain. hel Bulletin #050 —Map 1, 2014 Page 2 of 16 k:\Handouts\Environmental ChecklistMg2014 Besides the proposed project, there are no known pending applications or proposals related to the subject parcel. 10. List any government approvals or pemuts that will be needed for your proposal, if knownDLelpj City of Federal Way Administrative Decision Department of Fish and Wildlife Hydraulic Project Approval (HPA) Section 401 Water Quality Certification and Coastal Zone Management Consistency determination from Ecology Section 404 Nationwide Permit Verification from the U. S. Army Corps of Engineers 11. Give brief, complete description of your proposal, including the proposed uses and the size of the project and site. There are several questions later in this checklist that ask you to describe certain aspects of your proposal. You do not need to repeat those answers on this page. (Lead agencies may modify this form to include additional specific information on project description.) jl,.c1p1 For several years prior to November 2015, a 24-inch cast iron sanitary sewer pipe crossing Cold Creek was exposed. In the exposed condition, the sewer pipe functioned as a weir and was vulnerable to damage and failure due to undermining, falling trees, and landslides. Since failure of the pipe would result in significant environmental impacts resulting from spillage of raw sewage into the creek, the Lakehaven Utility District was in the process of preparing maintenance plans to adequately protect the pipe. Significant storm events in November 2015 resulted in high stream flows and movement of woody materials which, in turn, helped to rebury the pipe with sediments. However, since the materials covering the pipe are considered unstable and temporary, the Lakehaven Utility District decided to proceed with preparing plans to permanently protect the pipe. The designs supplement the existing cover materials by filling in 75 feet of stream channel downstream of the pipe with a rounded - rock streambed substrate mixture that is formulated to be stable under conditions of high flows. Woody materials including logs, root wads, and limbs will also be included in the materials used to re-form the channel. Prior to in -stream work, fish will be removed and excluded from Cold Creek and stream flow will be temporarily diverted. The plans have been designed to enable fish passage, even with the steep gradient. It is the intent of the proposed project to leave the pipe and existing materials covering the pipe in -place, with the addition of supplemental material as described above. However, should the sewer line become re -exposed due to natural action prior to construction, additional protection will be provided to the pipe by placing a steel casing around it or providing additional pipe joint support, and then ensuring sufficient cover and placing the streambed rock mixture extending downstream as described above. There is an additional 8-inch sewer cast iron lateral from the southwest that serves the 4th Avenue cul-de-sac. The sewer lateral connects to the sewer manhole on the southwest side of the creek crossing. Running parallel to the sewer lateral is an 18-inch storm drain that drains into Cold Creek. It is apparent that some years ago the lower part of the storm drain became dislodged, causing undermining of the sewer and storm drain pipes. Both pipes were temporarily stabilized. This project proposes to permanently stabilize the 8-inch sewer pipe by adding quarry spall 51i over the sewer pipe, surfaced with rounded gravel and cobbles, and to stabilize the storm drain main by adding additional pipe anchors. 12. Location of the proposal. Give sufficient information for a person to understand the precise location of your proposed project, including a street address, if any, and section, township, and r u-ige, if known. If a proposal would occur over a range of area, provide the range or boundaries of the site(s). Provide a legal description, site plan, vicinity map, and topographic map, if reasonably available. While voxl should submit any plans required by the agency, you are not required to duplicate maps or detailed plans submitted with any permit applications related to this checklist. 1h The proposed project is located along Cold Creek in a forested ravine within the City of Federal Way. Cold Creek is a direct tributary of Puget Sound; the project site is located about 1/3 of a mile upstream from the mouth of the creek. The project area is located in Section 5; Township 21 Noah, Range 4 East. The project site is about 275 feet upstream of the Lakehaven Utility District Redondo Treatment Plant, on the northeast corner of parcel #1862700470. B. ENVIRONMENTAL ELEMENTS he_ 1. Earth a. General description of the site Didw (underline/circle one): Flat, rolling, hilly, steepslopes mountainous, other. ravine b. What is the steepest slope on the site (approximate percent slope)? Viellpj Btilledia #050 — May 1, 2014 Page 3 of 16 k:\Handouts\Environmental Checklist May 2014 Approximately 70%. c. What general types of soils are found on the site (for example, clay, sand, gravel, peat, muck)? If you know the classification of agricultural soils, specify them and note any agricultural land of long-term commercial significance and whether the proposal results in removing any of these soils. lh� Site soils data is based on review of the United States Department of Agriculture (USDA) Web Soil Survey. The soils within the project area are Alderwood and Kitsap soils. These soils are moderately well drained. Alderwood soils are described as gravelly ashy sandy loam, and the Kitsap soils are described as ashy silt loam. These soils are classified as hydrologic soil group (HSG) C, having slow infiltration rates. d. Are there surface indications or history of unstable soils in the immediate vicinity? If so, describe. 1_r 1p,1 Yes; prior to November of 2015, the 24-inch sewer pipe was exposed and acting as a weir. Major storm events in November caused woody debris to enter the stream and partially block the channel. This blockage caused gravel and other sediments to back up, reburying the pipe. As the woody material begins to degrade, the materials that it holds back may become unstable and wash down stream exposing the pipe. The project site is in the middle of a ravine with steep slopes and has been designated by the Washington State Department of Ecology as unstable as part of the Coastal Zone Atlas of Washington. The project site is also designated as a landslide hazard area and an erosion hazard area by the City of Federal Way. e. Desceibe dze purpose, type, total area, and approximate quantities and total affected area of any filling, excavation, and grading proposed. Indicate source of fill. Fill materials will be introduced to reform the stream channel in a manner that will ensure the pipe is adequately covered and protected. Fill materials will consist of a rounded -rock streambed substrate mixture. The substrate mixture will be sized large enough to be stable under conditions of high stream flows. As such, the proposed substrate mixture includes large gravel, cobbles and boulders for stability, but is well -graded such that smaller gravel particles are also included. Rock is specified to be rounded rather than angular to improve habitat and better match natural conditions for the project setting. The total stream channel area vill be approximately 75 feet long and 30 feet wide (totaling 2250 SF). The depth and width of the fill varies based on the topography, but will average around 3-4 feet in depth. The total amount of fill anticipated for this project is approximately 250 cubic yards. Fill material will be sourced from a local construction company. Significant quantities of both large and smaller woody materials will also be placed along with and partially buried by the boulder channel substrate. Adjacent to Cold Creek, an 8-inch sewer lateral from the southwest will be stabilized by adding quarry spall fill over the sewer pipe, surfaced with rounded gravel and cobbles. Approximately 75 cubic yards of material will be placed, covering an area of approximately 1,000 square feet. Little excavating or dredging will occur and no soil or rock materials will be removed from the site. Minor excavation may occur in the streambed, but only through previously -placed rock armoring materials and/or recently -deposited sediments, and only to the extent needed to form depressions to accept root wads such that they may be placed as low as desired in the channel. An existing sewer manhole cover above the right bank is now buried and will be re -exposed as part of the project. Only materials originally disturbed during sewer line construction or recently disturbed by localized soil instability or tree falls will be excavated to re -expose this manhole. A spyder-type hoe or excavator will be used for all of these activities. f. Could erosion occur as a result of clearing, construction, or use? If so, generally describe. sly iL14 Some minor erosion and settling could occur as a result of clearing and construction. However, the project is specifically designed to minimize down -cutting and erosion in Cold Creek in order to protect the sewer pipe. During construction, any exposed soils will be protected by using Temporary Erosion and Sediment Control best management practices. g. About what percent of the site will be covered with impervious surfaces after project construction (for example, asphalt or buildings)? 20l No impervious surfaces are proposed as part of this project. h. Proposed measures to reduce or control erosion, or other impacts to the earth, if any iel Bulletin #050—May 1, 2014 Page 4 of 16 k:\Handouts\Environmental Cheddist Mg 2014 Temporary erosion and sediment control (TESC) plans were prepared as part of the designs to address erosion concerns. TESC plans include: • Mark clearing limits • Establish construction access • Control flow rates ■ Install sediment controls, (including silt fence at the OHWM) • Stabilize soils • Protect slopes • Stabilize channels and outlets • Control pollutants • Control dewatering • Maintain BMPs • Manage the project 2. Air a. What types of emissions to the air would result from the proposal during construction, operation, and maintenance when the project is completed? If any, generally describe and give approximate quantities if known. hel Construction activities have the potential to create temporary fugitive dust emissions from materials handling, and earth - moving activities. Also, mobile and stationary equipment would be used to construct the proposed project, generating exhaust emissions (e.g. carbon monoxide, sulfur, and particulates) due to the combustion of gasoline and/or diesel fuels. These dust and exhaust emissions are expected to be minimal, localized, and temporary. b. Are there any off -site sources of emissions or odor that may affect your proposal? If so, generally describe. �gl j There are no off -site sources of emissions or odor that might affect the proposed project. c. Proposed measures to reduce or control emissions or other impacts to air, if any: During construction, impacts to air quality will be reduced by keeping equipment in good repair and adhering to standard federal, state, and local emission control criteria for vehicles and equipment. 3. Water a. Surface Water hel 1) Is there any surface water body on or in the immediate vicinity of the site (including year-round and seasonal streams, saltwater, lakes, ponds, wetlands)? If yes, describe type and provide names. If appropriate, state what stream or river it flows into. Yes; Cold Creek is a perennial stream that flows directly into Puget Sound. Wetlands have also been delineated along the north ravine sideslope above the creek. 2) Will the project require any work over, in, or adjacent to (within 200 feet) the described waters? If yes, please describe and attach available plans. ftlpj Yes; the project will require work within Cold Creek. The streambed reconfiguration will take place in and directly adjacent to the creek channel. Temporary access across some wetland areas will occur, to be restored by implementation of a native revegetation plan. 3) Estimate the amount of fill and dredge material that would be placed in or removed from surface water or wetlands and indicate the area of the site that would be affected. Indicate the source of fill material. VLdpi The total amount of fill anticipated to be placed within Cold Creek for this project is around 250 cubic yards over 2,250 square feet. The creek will be dewatered during placement. Fill material will be sourced from a local construction company. Significant uantities of both lax a and smaller wood materials will also be placed along with and pUtially buried by the Bulletin #050 —May 1, 2014 Page 5 of 16 kk\Handouts\Environmental Checklist My 2014 boulder channel substrate. 4) Will the proposal require surface water withdrawals or diversions? Give general description, purpose, and approximate quantities if known. VLe1W Yes; prior to in -stream work, the channel will be temporarily dewatered and diverted following safe fish removal and exclusion procedures. The stream diversion will avoid and minimize turbidity and water quality impacts that would otherwise be associated with the in -stream construction. 5) Does the proposal lie within a 100-year floodplain? If so, note the location on the site plan. DLelp No; this proposal does not lie within a FEMA mapped 100-year floodplain. 6) Does the proposal involve any discharges of waste materials to surface waters? If so, describe the type of waste sand anticipated volume of discharge. P"e . The proposal does not involve any discharges of waste materials to surface waters. However, when stream flow is redirected into the reconfigured channel after construction, some of the fine sediments within the gravel substrate mixture may become mobilized and result in minimal, temporary turbidity impacts. b. Ground Water 7) Will groundwater be withdrawn from a well for drinking water or other purposes? If so, give a general description of the well, proposed uses, and approximate quantities withdrawn from the well. Will water be discharged to groundwater? Give general description, purpose, and approximate quantities if known. VidW No ground water withdrawals are associated with this project. 8) Describe waste material that will be discharged into the ground from septic tanks or other sources, if any (for example: domestic sewage; industrial conoining the following chemicals... ; agricultural; etc). Describe the general size of the system, the number of such systems, the number of houses to be served (if applicable), or the number of animals or humans the system(s) are expected to serve. VLe1W No waste material discharges into the ground or from other sources are associated with this project. b. Water runoff (including stormwater): 1) Describe the source of runoff (including stormwater) and method of collection and disposal, if any (include quantities, if known). Where will this water flow? Will this water flow into other waters? If so, describe. li This project will not modify runoff patterns. Cold Creek receives runoff from a tributary basin that extends to above Easter Lake, totaling 450 acres. Cold Creek collects the runoff and carries it to Puget Sound. 2) Could waste materials enter ground or surface waters? If so, generally describe. 1 ell This project could potentially enable small amounts of fine rock sediments (silt) to enter Cold Creek from the installed stream substrate mix. During construction, fuel, lubricant, or other material spills from equipment could enter surface waters. However, risks will be minimized through employment of a spill prevention and response plan. Heavy equipment used for in- and near -water work will utilize non -toxic (vegetable based) hydraulic fluids, in case of spills, and will be re -fueled away from the stream. Spill avoidance and containment procedures and equipment will be in place, and a temporary erosion and sedimentation control plan, as detailed, will be implemented. Stream flows will be diverted around the in -channel work area. This project would not otherwise generate waste materials that could enter ground water or surface waters. 3) Does the proposal alter or otherwise affect drainage patterns in the vicinity of the site? If so, describe. While the project will not affect general drainage patterns, it will modify the flow patterns of Cold Creek. Installation of a rounded boulder, cobble, and gravel substrate with included woody materials downstream of the sewer pipe will cause flows over the submerged pipe to slow and deposit sediment, ensuring that the pipe stays buried and protected. Stream velocity may decrease slightly immediate downstream of the sewer pipe due to a reduction in streamgradient. Bulletin #050 — Mav 1, 2014 Page 6 of 16 k:\Handouts\Environmental Checklist May 2014 c. Proposed measures to reduce or control surface, ground, and runoff water, and drainage pattern impacts, if any: The erosion control measures described under questions Blf and h would help control impacts to surface and runoff water. 4. Plants Lh1 a. Check the types of vegetation found on the site: -XL-deciduous tree: alder, maple, aspen, other -XL--evergreen tree: fir ced= pine, other X shrubs _grass pasture crop or grain orchards, vineyards, or other permanent crops X wet soil plants: cattail, buttercup, bulrush, skunk cabbageother water plants: water lily, eelgrass, milfoil, other other types of vegetation b. What kind and amount of vegetation will be removed or altered? !ML Some limited vegetation disturbance is expected to occur in order to enable site access and construction. The site will be accessed using a spyder excavator to minimize vegetation impacts. Vegetation impacts will be primarily to shrubs and ground cover, however two existing downed maple logs bridging the stream channel and two small live alders (less than 10- inch diameter) will need to be moved and removed, respectively. Since shrubbery will not be removed, only disturbed, it is expected that much of the disturbed vegetation will be able to return to full vigor after the project is completed, particularly in view of additional vegetation to be planted. c. List threatened and endangered species known to be on or near the site. lei 1g� No threatened or endangered plant species are known to be on or near the site. d. Proposed landscaping, use of native plants, or other measures to preserve or enhance vegetation on the site, if any. VidW Only two small alder trees, near the stream channel, will need to be removed to gain site access and conduct the proposed in - channel work (see 4.b, above). It is intended that all other trees in the project area will be retained and protected. Areas where vegetation has been temporarily impacted associated with access and construction will be restored through the implementation of a native revegetation plan. The proposed restoration plan covers a total of approximately 11,830 square feet and includes native plantings, invasive weed control, maintenance, and monitoring. e. List all noxious weeds and invasive species known to be on or near the site. The site is mostly free of invasive species, although there are scattered patches of Himalayan blackberry (Rubus armeniacus) and reed canary grass (Phalaris arundinacea). 5. Animals a. List any birds and other animals which have been observed on or near the site, or are known to be on or near the site. Examples include: V2dpJ birds: hawk, heron, eagle• songbirds, other: mammals: deer, bear, elk, beaver, other: fish: bass, salmon, trout, herring, shellfish, other b. List any threatened and endangered species known to be on or near the site. According to mapping on the Washington Department of Fish and Wildlife's SalmonScape website, fall Chinook salmon and Winter Steelhead are modeled to be present downstream of the project site. However, an observed steep cascade migration barrier downstream of the project site would indicate that anadromous salmonid fish presence in the project area is unlikely. Chinook salmon, Steelhead, or bull trout presence has not been documented at the project site. Current USFWS and NMFS Bulletin #050 — May 1, 2014 Page 7 of 16 k:\Handouts\Environmental Checklist Mg 2014 species lists have been consulted and a Biological Evaluation prepared which concludes that there are no other threatened or endangered species known to be on or near the site. c. Is the site part of a migration route? If so, explain. DLel As described above, adult and juvenile Chinook and Steelhead are likely to exist below the project site and may migrate up and downstream. Coho salmon are modeled to be present in and above the project area and could migrate through the project site, except for the observed migration barrier below the site. d. Proposed measures to preserve or enhance wildlife, if any. Jg14 The project will implement a detailed restoration plan that includes planting native species and controlling invasive species. The project also includes the installation of woody debris in the stream channel. Vegetation enhancement may improve wildlife habitat. The native vegetation may also improve slope stability and the woody debris may improve stream habitat complexity over the current conditions. e. List any invasive animal species known to be on or near the site. There are no known invasive animal species on or near the project site. 6. Energy and Natural Resources a. What kinds of energy (electric, natural gas, oil, wood stove, solar) will be used to meet the completed project's energy needs? Describe whether it will be used for heating, manufacturing, etc. 1hel This project has no new energy needs. b. Would your project affect the potential use of solar energy by adjacent properties? If so, generally describe. D20W The proposal will not affect the potential use of solar energy by adjacent properties. c. What kinds of energy conservation features are included in the plans of this proposal? List other proposed measures to reduce or control energy impacts, if any. VIdW No such measures are necessary. 7. Environmental Health a. Are there any environmental health hazards, including exposure to toxic chemicals, risk of fire and explosion, spill, or hazardous waste that could occur as a result of this proposal? If so, describe. Typical environmental health hazards associated'with construction could occur during this project. 1) Describe any known or possible contamination at the site from present or past uses. At the project site, there is no known contamination from present or past uses according to the Washington Department of Ecology Toxic Hazard Cleanup Site Index. 2) Describe existing hazardous chemicals/conditions that might affect project development and design. This includes underground hazardous liquid and gas transmission pipelines located within the project area and in the vicinity. The sewer trunk line carries raw sewage underground to the Lakehaven Sewage Treatment plant. If ruptured, this pipe would be hazardous to the operators, to adjacent properties downstream and to fish and wildlife. There are no other known liquid, gas or other pipelines located within the project area and vicinity. 3) Describe any toxic or hazardous chemicals that might be stored, used, or produced during the project's development or construction, or at any time during the operating life of the project. Chemicals typically associated with construction vehicles (fuel, lubricants, hydraulic fluids) may be stored and used on site Bulletin #050 — Map 1, 2014 Page 8 of 16 k:\Handouts\Environmental Checklist May 2014 temporarily during construction. 4) Describe special emergency services that might be required. Special emergency services are not anticipated at the site. In the unlikely event that an accident (spill, fire, other exposure) occurs involving toxic chemicals or hazardous wastes, the local fire department and emergency medical services would respond. Spill response procedures must be implemented in a timely manner to prevent the release of pollutants. Any non- hazardous accidents may also require medical services. The full range of safety and accident response supplies will be on -site to treat any emergency. 5) Proposed measures to reduce or control environmental health hazards, if any. All pollutants, including waste materials and demolition debris, that occur on -site during construction shall be handled and disposed of in a manner that does not cause contamination of runoff. Good housekeeping and preventative measures will be taken to ensure that the site will be kept clean, well -organized, and free of debris. Cover, containment, and protection from vandalism shall be provided for all chemicals, liquid products, petroleum products, and non -inert wastes present on the site. On -site fueling tanks shall include secondary containment. All potential pollutants other than sediment will be handled and disposed of in a manner that does not cause contamination of runoff. b. Noise 1) What types of noise exist in the area which may affect your project (for example: traffic, equipment, operation, other)? h 1 The site is in a densely vegetated ravine; external sources of noise will be minimal. Stream noise is not expected to affect the project. 2) What types and levels of noise would be created by or associated with the project on a short-term or a long term basis (fox example: traffic, construction, operation, other)? Indicate what hours noise would come from the site. 1 Noise and vibration levels in the vicinity of construction would temporarily increase during construction. Noise and medium vibration are expected to result from operation of spyder excavators. Temporary construction noise is exempt from state noise limits during daytime hours, per WAC 173-60-050(3)(a). The completed project would not contribute noise or vibration beyond that which already exists in the area. 3) Proposed measures to reduce or control noise impacts, if any: ftla Construction equipment would be muffled in accordance with applicable laws, and the project would comply with environmental noise standards set by the State of Washington, WAC 173-60, which establish limits on the level and duration of noise crossing property boundaries. 8. Land and Shoreline Use a. What is the current use of the site and adjacent properties? Will the proposal affect current land uses on nearby or adjacent properties? If so, describe. h�� The subject parcel is currently vacant and undeveloped. Parcels (17) to the adjacent south and west are currently used for single-family homes. A mobile home park exists to the northwest of the subject parcel. Directly north of the subject parcel is the Lakehaven Redondo Sewage Treatment Plant. To the east is a large, mostly undeveloped parcel which contains a forested ravine and the PowellsWood gardens. This project will not affect any of the current land uses on nearby or adjacent properties. b. Has the project site been used as working farmlands or working forest lands? If so, describe. How much agricultural or forest land of long-term commercial significance will be converted to other uses as a result of the proposal, if any? If resource lands have not been designated, how many acres in farmland or forest land tax status will be converted to nonfarm or nonforest use? The project site has not been used as working farmlands or as working forest lands. 1) Will the proposal affect or be affected by surrounding working farm or forest land normal business operations, such as Bulletin #050 —May 1, 2014 Page 9 of 16 k:\Handouts\Environmental Checklist M y 2014 oversize equipment access, the application of pesticides, tilling, and harvesting? If so, how. The proposed project will not affect or be affected by working farm or forestland businesses. c. Describe any structures on the site. VLe1W On site there are two stormwater drainage pipes and a sewer trunk line with two manhole access points. No other structures exist in the project area. d. Will any structures be demolished? If so, what? hel No structures will be demolished as part of this project. e. What is the current zoning classification of the site? VLe1W The project site is zoned as RS-15.0, or residential single-family 1 unit/15,000 square feet. £ What is the current comprehensive plan designation of the site? 11 � n l The subject parcel is designated as Single Family, Medium Density in the City of Federal Way's Comprehensive Plan. g If applicable, what is the current shoreline master program designation of the site? j Linn i Not applicable. h. Has any part of the site been classified as a critical area by the city or county? If so, specify. DLe1W Yes; Cold Creek is classified as a critical area by the City of Federal Way. Additionally, there are two wetlands in the vicinity of the project. Wetland A is a Category III slope wetland that extends downslope to the banks of Cold Creek. Wetland B is also a Category III wetland that is located just northeast of the dirt access road at the base of a large wooden retaining wall near the municipal boundary. The project site is also designated as an erosion hazard area and a landslide hazard area. i. Approximately how many people would reside or work in the completed project? No people would work or reside in the completed project. j. Apprcr.imately how many people would the completed project displace? Vielp This project would not displace any people. k. Proposed measures to avoid or reduce displacement impacts, if any. VLeIW No such measures are necessary. 1. Proposed measures to ensure the proposal is compatible with existing and projected land uses and plans, if any. 1�1 No such measures are necessary; the proposal is compatible with existing and projected land uses and plans. m. Proposed measures to ensure the proposal is compatible with nearby agricultural and forest lands of long-term commercial significance, if any. No such measures are necessary. 9. Housing a. Approximately how many units would be provided, if any? Indicate whether high, middle, or low-income housing. �l This project would not provide any housing units. Bulletin #050 —May 1, 2014 Page 10 of 16 k:\Handouts\Environmental Checklist May 2014 b. Approximately how many units, if any, would be eliminated? Indicate whether high, middle, or low-income housing. hel This project would not eliminate any housing units. c. Proposed measures to reduce or control housing impacts, if any. Vielpj No such measures are necessary. 10. Aesthetics a. What is the tallest height of any proposed structure(s), not including antennas; what is the principal exterior building material(s) proposed? VLelpl No structures are proposed as part of this project. b. What views in the immediate vicinity would be altered or obstructed? V164 Views in the immediate vicinity would not be altered or obstructed in any noticeable way. c. Proposed measures to reduce or control aesthetic impacts, if any. jhjejpj No such measures are necessary. 11. Light and Glare a. What type of light or glare will the proposal produce? What time of day would it mainly occur? DicLol The proposal would not produce any light or glare. b. Could light or glare from the finished project be a safety hazard or interfere with views? L l _ l d Not applicable. c. What existing off -site sources of light or glare may affect your proposal? D2dW There are no existing off -site sources of light or glare that will affect the proposed project. d. Proposed measures to reduce or control light and glare impacts, if any. No such measures are necessary. 12. Recreation a. What designated and informal recreational opportunities are in the immediate vicinity? PowellsWood garden is directly south of the proposed project site. No other designated or informal recreation opportunities are in the immediate vicinity. b. Would the proposed project displace any existing recreational uses? If so, describe. VLelpl The proposed project would not displace any existing recreational uses. c. Proposed measures to reduce or control impacts on recreation, including recreation opportunities to be provided by the project or applicant, if any. No such measures are necessary. 13. Historic and cultural preservation Bulletin #050—May 1, 2014 Page 11 of 16 k.\Handouts\Environmental Cheddist Afg 2014 Are there any buildings, structures, or sites, located on or near the site that are over 45 years old listed in or eligible for listing in national, state, or local preservation registers located on or near the site? If so, specifically describe. VidW There are no buildings, structures, or sites located on or near the site listed in national, state or local preservation registers. b. Are there any landmarks, features, or other evidence of Indian or historic use or occupation? This mayinclude humanburials or old cemeteries. Are there any material evidence, artifacts, or areas of cultural importance on or near the site? Please list any professional studies conducted at the site to identify such resources. LelW No landmarks, features, or other evidence of Indian or historic use is documented according to Department of Archeology and historic Preservation's (DAHP) WISAARD (Washington Information System for Architectural and Archaeological Records Data). Describe the methods used to assess the potential impacts to cultural and historic resources on or near the project site. Examples include consultation with tribes and the department of archeology and historic preservation, archaeological surveys, historic maps, GIS data, etc. Je14 No such landmark or evidence is known to be on or next to the project site. d. Proposed measures to avoid, minimize, or compensate for loss, changes to, and disturbance to resources. Please include plans for the above and any permits that may be required. Should historic, archeological, scientific or culturally significant items be encountered during implementation of maintenance activities, work would be temporarily stopped while the appropriate agencies are notified. 14. Transportation a. Identi4, public streets and highways serving the site or affected geographic area and describe proposed access to the existing street system. Show on site plans, if any. DLelp The site will be accessed via the Lakehaven Redondo Sewage Treatment facility at the end of Sound View Drive South. No additional access streets are proposed as part of this project. b. Is the site or affected geographic area currently served by public transit? If so, generally describe. If not, what is the approximate distance to the nearest transit stop? h 1 The site is not currently served by public transit. The nearest bus stop is at the intersection of SW 301 Street and 1s, Ave S. This bus stop is about a 1.3 mile walk from the site and is served by the King County Metro 901 route. c. How many additional parking spaces would the completed project or non -project proposal have? How many would the project or proposal eliminate? hRi This project would not add or eliminate any parking spaces. d. Will the proposal require any new or improvements to existing roads, streets, pedestrian, bicycle, or state transportation facilities, not including driveways? If so, generally describe (indicate whether public or private). [1 1� This project would not require any new or improved roads or transportation facilities. e. Will the project or proposal use (or occur in the immediate vicinity of) water, rail, or air transportation? If so, generally describe. DiL14 This project would not use, or occur in the vicinity of water, rail or air transportation. How many vehicular trips per day would be generated by the completed projector proposal? If known, indicate when peak volumes would occur and what percentage of the volume would be trucks (such as commercial and non -passenger vehicles). What data or transportation models were used to make these estimates? VLOW Bulletin #050 —Map 1, 2014 Page 12 of 16 k:\Handouts\Environmental Checklist May2014 This project would not change the amount of vehicular trips in the area. g. Will the proposal interfere with, affect, or be affected by the movement of agricultural and forest products on roads or streets in the area? If so, generally describe. This project would not affect or be affected by the movement of agricultural and forest products. h. Proposed measures to reduce or control transportation impacts, if any. No such measures are necessary. 15. Public services a. Would the project result in an increased need for public services (for example: fire protection, police protection, public transit, healthcare, schools, other)? If so, generally describe. Vidp4 This project would not result in an increased need for public services. b. Proposed measures to reduce or control direct impacts on public services, if any. 1, J1 No such measures are necessary. 16. Utilities a. Underline/circle utilities currently available at the site: VLe-lpj electricity, natural gas, water, refuse service, telephone, sanitary sewer, septic system, other b. Describe the utilities that are proposed for the project, the utility providing the service, and the general construction activities on the site or in the immediate vicinity which might be needed. lhel_p� This project would not require any utilities. However, the project does aim to protect the sanitary sewer service provided by the Lakehaven Utility District. C. SIGNATURE UMLPI The above answers are true and complete to the best of my knowledge. I understand that the lead agency is relying on them to make its decision. Signature: Printed Name of Signee: Position and Agency/Organization: Date Submitted: - Bulletin #050 —May 1, 2014 Page 13 of 16 k:\Handouts\Environmental Checklist May 2014 Location and Vicinity Maps Y Bulletin #050 — May 1, 2014 Page 14 of 16 k:\Handouts\Environmental Checklist May 2014 D. SUPPLEMENTAL SHEET FOR NONPROJECT ACTIONS Lhel (IT IS NOT NECESSARY to use this sheet for project actions.) Because these questions are very general, it may be helpful to read them in conjunction with the list of the elements of the environment. When answering these questions, be aware of the extent the proposal, or the types of activities likely to result from the proposal, would affect the item at a greater intensity or at a faster rate than if the proposal were not implemented. Respond briefly and in general terms. 1. How would the proposal be likely to increase discharge to water, emissions to air, production, storage, or release of toxic or hazardous substances; or production of noise? Proposed measures to avoid or reduce such increases are: 2. How would the proposal be likely to affect plants, animals, fish, or marine life? Proposed measures to protect or conserve plants, animals, fish, or marine life are: i 3. How would the proposal be likely to deplete energy or natural resources? Proposed measures to protect or conserve energy and natural resources are: 4. How would the proposal be likely to use or affect environmentally sensitive areas or areas designated (or eligible or under study) for governmental protection; such as parks, wilderness, wild and scenic rivers, threatened or endangered species habitat, historic or cultural sites, wetlands, floodplains, or prime farmlands? Proposed measures to protect such resources or to avoid or reduce impacts are: Bulletin #050 — May 1, 2014 Page 15 of 16 k:\Handouts\Environmental Checklist May 2014 How would the proposal be likely to affect land and shoreline use, including whether it would allow or encourage land or shoreline uses uicoinpauble with existingplans? Proposed measures to avoid or reduce shoreline and land use impacts are: 6. How would the proposal be likely to increase demands on transporradon or public services and utilities? Proposed measures to reduce or respond to such demand(s) are: 7. Identify, if possible, whether the proposal may conflict with local, state, or federal laws or requirements for the protection of the environment Bulletin #050—May 1, 2014 Page 16 of 16 k:\Handouts\Environmental ChecklistM92014 LrSATrny � Corps of Erigineer WASHINGTON STATE Seattle Distnct ^ Joint Aquatic Resources Permit Application (JARPA) Form1,2 ,,L.i Pj USE BLACK OR BLUE INK TO ENTER ANSWERS IN THE WHITE SPACES BELOW. •- MAR 2 4 Z016 Part I—Prniar_t Irlpntifir_atinn CITY OF FEDERALWAY -------------------------------------- AGENCY USE ONLY r � Date received: r � r � Agency reference #: Tax Parcel #(s): r � r � L---------_----------- --------- -.---1 _ . .. _.J--- .w--------------- -- CU5 1. Project Name (A name for your project that you create. Examples: Smith's Dock or Seabrook Lane Development) hei Cold Creek Sanitary Sewer Trunk Line Crossing Project Part 2—Applicant The person and/or organization responsible for the project. het 2a. Name (Last, First, Middle) Miller, Ken P. E., Engineering Manager 2b. Organization (If applicable) Lakehaven Utility District 2c. Mailing Address (Street or PO Box) 31623 1st Avenue South, P. O. Box 4249 2d. City, State, Zip Federal Way, WA 98063 2e. Phone (1) 2f. Phone (2) 2g. Fax 21h. E-mail (253) 946-5405 (253) 941-1516 (253) 946-9552 kmiller@lakehaven.org lAdditional forms may be required for the following permits: • If your project may qualify for Department of the Army authorization through a Regional General Permit (RGP), contact the U.S. Army Corps of Engineers for application information (206) 764-3495. • If your project might affect species listed under the Endangered Species Act, you will need to fill out a Specific Project Information Form (SPIF) or prepare a Biological Evaluation. Forms can be found at ht llwww.nws.usace.arm .mil/MissioWCivilWorWR ulato IPermitGuideboaklEndan ered5 ecies.as x. • Not all cities and counties accept the JARPA for their local Shoreline permits. If you need a Shoreline permit, contact the appropriate city or county government to make sure they accept the JARPA. 2To access an online JARPA form with [help] screens, go to http:/Iwww.epefmitfing.wa.gov/sitelalias resourcecenterl'a a 'ar a form199841'a a form.as x. For other help, contact the Governor's Office for Regulatory Innovation and Assistance at (800) 917-0043 or heloRaria.wa_gov. JARPA Revision 2015.1 Page 1 of 27 Part 3-Authorized Agent or Contact Person authorized to represent the applicant about the project. (Note: Authorized agent(s) must sign 11 b of this application.) l,eil 3a. Name (Last, First, Middle) Booth, Kenny, AICP 3b. Organization (If applicable) The Watershed Company 3c. Mailing Address (street or Po Box) 750 6tn Street South 3d. City, State, Zip Kirkland, WA 98033 3e. Phone (1) 3f. Phone (2) 3g. Fax 3h. E-mail (425) 822-5242 (425) 827-8136 kbooth@watershedco.com Part 4-Property Owner(s) Contact infnrmation for nannies nr nrnanizatir;n� n Aininn +hc rn or+ Pies% �e,he, ee the project will occur. %. I I er boti i r ....r... ...0 .� .. p, p..yk,.. , ..g �,� p , upland and aquatic ownership because the upland owners may not own the adjacent aquatic land. I,elpJ ❑ Same as applicant. (Skip to Part 5.) ® Repair or maintenance activities on existing rights -of -way or easements. (Skip to Part 5.) ❑ There are multiple upland property owners. Complete the section below and fill out JARPA Attachment A for each additional property owner. ❑ Your project is on Department of Natural Resources (DNR)-managed aquatic lands. If you don't know, contact the DNR at (360) 902-1100 to determine aquatic land ownership. If yes, complete JARPA Attachment E to apply for the Aquatic Use Authorization. 4a. Name (Last, First, Middle) 41b. Organization (If applicable) 4c. Mailing Address (street or Po Box) 4d. City, State, Zip 4e. Phone (1) 4f. Phone (2) 4g. Fax 4h. E-mail JARPA Revision 2015.1 Page 2 of 27 Part 5—Project Location(s) Identifying information about the property or properties where the project will occur. hei ❑ There are multiple project locations (e.g. linear projects). Complete the section below and use JARPA Attachment B for each additional project location. 5a. Indicate the type of ownership of the property. (Check all that apply_) [help] ❑ Private ❑ Federal ® Publicly owned (state, county, city, special districts like schools, ports, etc.) ❑ Tribal ❑ Department of Natural Resources (DNR) — managed aquatic lands (Complete JARPA Attachment E) 5b. Street Address (Cannot be a PO Box. If there is no address, provide other location information in 5p.) el N/A (City of Federal Way Owned — Crown Point Open Area) 5c. City, State, Zip (If the project is not in a city or town, provide the name of the nearest city or town.) hel Federal Way, WA 98003 5d. County fteipj King 5e. Provide the section, township, and range for the project location. Lei 1/4 Section Section Township Range NW'/4 Section 5 Township 21 N Range 04 E 5f. Provide the latitude and longitude of the project location. hel I • Example: 47.03922 N lat. /-122.89142 W long. (Use decimal degrees - NAD 83) 47.340265 N lat. /-122.329686 W long. 5g. List the tax parcel number(s) for the project location. Lei • The local county assessor's office can provide this information. 1862700470 (City of Federal Way Owned — Crown Point Open Area) 5h. Contact information for all adjoining property owners. (if you need more space, use JARPA Attachment C.) [help_) Name Mailing Address Tax Parcel # (if known) Diane Powell 29607 8th Avenue South ------------------------- ------------- 0521049011 Federal Way, WA 98003 Lakehaven Utility District PO Box 4249 ................ 0521049094 Federal Way, WA 98063 JARPA Revision 2015.1 Page 3 of 27 5i. List all wetlands on or adjacent to the project location. hei Wetlands A and B, see delineation report. 5j. List all waterbodies (other than wetlands) on or adjacent to the project location. hel Cold Creek (WRIA # 09-0381), direct tributary to Puget Sound 5k. Is any part of the project area within a 100-year floodplain? rf ei ❑ Yes ® No ❑ Don't know (Not in FEMA floodplain) 51. Briefly describe the vegetation and habitat conditions on the property. tr,.jipj Cold Creek near the formerly -exposed sewer line crossing flows through a well -forested ravine with steep sideslopes including a saturated -soil riparian wetland (Wetland A) approaching the streambank along the right (east) bank in the project area. Residential housing is prevalent above the sideslopes. The project area includes access down the east slope of the ravine and a section of the Cold Creek channel in the ravine bottom where in - stream work is proposed. Based on a topographic survey, average steepness of the ravine sideslopes ranges between 30 and 40 percent. Existing vegetation includes piggy -back, stink currant, salmonberry, dewberry, osoberry, lady fern, sword fern, and bracken fern in the understory, with bigleaf maple, red alder, western hemlock, Douglas -fir, and western red cedar included in the mix of trees forming the canopy. Forested and scrub -shrub Cowardin vegetation communities comprise Wetland A. Prominent vegetation includes red alder, salmonberry, red -osier dogwood, stink current, skunk cabbage, lady fern, and piggy -back plant. Wetland B is located upslope of an existing access road and includes a forested Cowardin vegetation community composed of red alder, salmonberry, small -fruited bulrush, lady fern, and giant horsetail. The ravine at and near the project area and extending upstream includes forested areas consisting of a mixed, second- or third -growth, deciduous -coniferous forest with comparatively few maturing conifers. Those conifers present are mostly Douglas -fir. No expansive tracts of pure conifer forest remain in the action area, and individual trees average less than 20 inches dbh. Baseline site conditions do not include mature and old growth coniferous forest stands of suitable size, continuity, structural diversity, and complexity to be suitable as habitat for northern spotted owls or, in addition, the large, high mossy branches needed to be suitable for marbled murrelets. The area is isolated by surrounding development. Suitable foraging and nesting habitat for marbled murrelet and northern spotted owls does not exist in the action area. Though somewhat unstable due to urbanized stream flows and ravine sideslope failures, Cold Creek generally appears to have a gravel substrate which is at least marginally suitable for use by salmonid fish species for spawning and for the growth of aquatic insect larvae. Streambed gravel includes cobbles and small -to -large gravel, yet it is somewhat too sandy to be ideal for fish spawning. Deposition of these fines is noted along the margins. Substantial wood occurs along the upper channel sections, though much of it is deciduous in origin and so is not persistent or long-lasting. Existing woody pieces are numerous and varied, and provide roughness and scour to result in pool formation. The stream supports numerous riffles although pools are less common and shallow. Some near -vertical slopes composed of hard silt form the streambanks at some locations just upstream of the exposed pipe (see photo 6 below). According to PHS data on the web (accessed January 11, 2016), coho salmon (O. kisutch) are shown to occur in the project area and vicinity along Cold Creek (stream #09-0385). The presence of winter steelhead (Oncorhynchus mykiss), fall Chinook salmon (Oncorhynchus tshawytscha) or bull trout (Salvelinus confluentus) is not indicated by the PHS data for the site, however WDFW's SalmonScape website mapping indicates the modeled presence of Chinook and steelhead beginning at and extending downstream from roughly the project area. Coho salmon presence in the project area is mapped as presumed as opposed to documented b JARPA Revision 2015.1 Page 4 of 27 SalmonScape. However, an observed steep cascades migration barrier identified downstream of the project area on the Redondo Sewage Treatment Plant site (see photo 8 below) brings into question the actual presence of any of these anadromous species within the project area. Coho salmon presence is mapped by SalmonScape as documented in the lowermost sections of the stream near the mouth, downstream from the vicinity of this barrier, and also downstream of the project area. In summary, anadromous salmonid fish use of Cold Creek at the project location is not documented, and is unlikely due to migration barriers located downstream. However, the presence of beneficial year -around stream flows suggests the possible or likely presence of non -migratory, resident cutthroat trout. 5m. Describe how the property is currently used. hei The parcel (#1862700470) which includes the project area where in -water work along Cold Creek will occur is owned by the City of Federal Way as the Crown Point Open Area. The parcel primarily consists of a wooded ravine down which Cold Creek flows, and other adjoining wooded open space areas. The parcel includes no buildings. Access is through the Redondo Wastewater Treatment Plant site. 5n. Describe how the adjacent properties are currently used. of The parcel to the north, 0521049094, is the site of the Lakehaven Utility District's Redondo Wastewater Treatment Plant. The parcel to the east (0521049011) is a large, undeveloped wooded parcel, similar to the property containing the project area in that it consists largely of the wooded ravine down which Cold Creek flows and additional wooded areas. Approximately 15 other, smaller parcels adjoin the parcel which includes the project area (the Crown Point Open Area). These are comparatively smaller, single-family residential lots, most of which, but not all, have been developed. 5o. Describe the structures (above and below ground) on the property, including their purpose(s) and current condition. they The property has no buildings on it, but it does include the a 24-inch cast iron sanitary sewer trunk line pipe crossing Cold Creek (WRIA # 09-0381) approximately 275 feet upstream of the Lakehaven Utility District Redondo Treatment Plant. The combined protection of this pipe and repair of its stream crossing is the purpose of the proposed project. The sewer trunk line itself is presumed sound (see technical Memorandum dated 2/18/16, LPD Engineering), however repairs and improvements at the crossing location are needed in order to provide permanent cover to the pipe and protect it from potential damage. A manhole on the east side of the stream at the crossing location has been buried with soils due to landsliding and/or trees being uprooted. This manhole will be re -exposed and risers added as needed to bring the rim to existing grade as part of the proposed project. Another, smaller sanitary sewer pipe and a storm drainage pipe and associated features lie on the property immediately to the west of the crossing, and these will also be reinforced as part of the proposed project. 5p. Provide driving directions from the closest highway to the project location, and attach a map. L[ieip] Driving directions: From Interstate 5 north or south at Federal Way: Take exit 143 for South 320tt' Street, head west. Turn right to head north on Pacific Highway S. (SR 99). Turn left onto South Dash Point Road (SR 509), and then immediately right onto Redondo Way South. Turn left on Sound View Drive South, keep right onto 4th Place South. Follow road through curves to dead end at the Redondo Sewage Treatment Plant. The project area is located in the City of Federal Way; Section 5, Township 21 North, Range 4 East; Central Puget Sound Drainage Basin; Water Resource Inventory Area 9 (WRIA 9) (Duwamish-Green). JARPA Revision 2015.1 Page 5 of 27 - - Redojid0 i n — V d Redondo f!r Treatment a s 2,,+h4> ` Planf-,_ C11 a /h S 25.3rd 31 . o-a. Project Area r (' m 211811, PI �q Sa al�,raa r - y� ti 79n�1` M1i - n Q i� O N S 301c1 SS � a 96 'At 3Ulyd St Q y t b 3031d Sr �a c 30ath S1 -041h P - - 3ii-th SI 'n 53051hP� Ucr Q January 14, 2016 1:18,056 0 0.15 0.3 06 M i S- 1 iT- - , 0 025 05 1 km Figure: Project Area and Vicinity Part 6—Project Description 6a. Briefly summarize the overall project. You can provide more detail in 6b. hei The existing trunk sewer line pipe at the Cold Creek crossing location is presently covered with 18 to 24 inches of loose, recently -deposited materials consisting largely of deciduous tree limbs and sandy streambed gravel. It is intended to leave the pipe and existing materials covering the pipe in -place and fill in the channel at and extending downstream from the pipe with a stable streambed rock mixture to ensure that pipe cover is maintained and to prevent undermining. See attached project plans for profiles and cross sections depicting this design. However, should the sewer line become re -exposed prior to construction due to action of the stream, consideration will be given to providing additional protection to the pipe such as by placing a casing around it prior to ensuring sufficient cover and placing the streambed rock mixture extending downstream as described above. JARPA Revision 2015.1 Page 6 of 27 The rounded -rock streambed substrate mixture will extend for approximately 75 feet downstream at up to 16% slope to match the existing streambed. By keeping the stream channel fairly steep along the project section extending downstream from the sewer pipe crossing, the length of channel affected as well as the quantity of rock material needing to be placed are minimized. The substrate mixture has been sized large enough and otherwise formulated to be stable under conditions of extreme stream flows, up to the 100-year event, at the relatively steep gradient needed. As such, the proposed substrate mixture includes large gravel, cobbles, and boulders for stability, but is also well -graded such that smaller gravel particles are also included. Rock is specified to be rounded rather than angular to improve habitat and better match natural conditions for the project setting. Small gravels are included to help stabilize the larger cobbles and boulders, and to limit subsurface flows. Significant quantities of both large and smaller woody materials will also be placed along with and partially buried by the bouldery channel substrate mixture. The placed rock will largely hold the wood in place, though additional anchoring will be provided. Rock and wood placement will be somewhat random to form a cascade - type feature or habitat with numerous short plunges separated by shallow pools. Configuration details may shift somewhat over time due to boulders shifting or wood decaying, but the overall form and function of the feature is expected to persist. Since Cold Creek flows through a steep -sided ravine near the project location, providing access to the project area for equipment and materials is difficult. It is proposed to move a spyder excavator into position at the bottom of the ravine on the downstream side of the sewer line crossing, and then proceed to work on positioning rock and wood materials to re-form the channel and stabilize the combination of materials now covering the pipe. Some existing maple logs bridging the stream channel and two small alders will need to be removed. Rock and wood materials will be brought on -site on small trucks to an existing access and staging area part way up the ravine sideslope, remaining from previous work in the area. Conventional equipment will be stationed there to feed materials down the ravine sideslope to the spyder excavator working below. Boulders may be rolled down the slope on the ground or on steel plates or other type of chute system. Gravelly materials and fines may be fed down the ravine sideslope using a half -pipe or other type of chute. At the bottom of the ravine, the spyder would place the larger woody pieces first and then place the rock materials and smaller woody materials over and around them to form the cascade habitat feature described above. Materials access down the ravine sideslope will be along two pathways, each 20 feet wide or less. Though salmonberries and other vegetation will be disturbed, much of it is expected to grow back from the roots the following year. A manhole on the right (east) bank is covered over by soils, possibly from the root ball of a maple tree that fell down next to it. This manhole will be located, but avoided and left covered during in -stream work. It will be exposed by the spyder as it is leaving the site after the other work is done, with manhole risers added as needed to bring the rim to existing grade. There is also an additional 8-inch sewer lateral from the southwest that serves the 41 Avenue cul-de-sac. The sewer lateral connects to the sewer manhole on the southwest side of the creek crossing. Running parallel to the sewer lateral is an 18-inch storm drain that drains into Cold Creek. It is apparent that some years ago the lower part of the storm drain became dislodged, causing undermining of the sewer and storm drain pipes. Both pipes were temporarily stabilized. This project proposes to permanently stabilize the sewer by adding quarry spall fill up to the bottom of the sewer pipe to support it, surfaced with rounded gravel and cobbles, and to stabilize the storm drain main by adding additional pipe anchors. Stream flows will be diverted around the work area during in -stream work following safe fish removal and exclusion procedures as shown on the plans and described in the notes. Any accumulating silty seepage water will be collected and infiltrated and or biofiltered in areas along the stream channel. If this proves to be ineffective or otherwise infeasible, such turbid water will be discharged through one of two manholes in the area to the sanitary sewer system, as a contingency. JARPA Revision 2015.1 Page 7 of 27 6b. Describe the purpose of the project and why you want or need to perform it. neip The goal of the project is to provide adequate cover and otherwise protect the trunk sewer line pipe at the stream crossing location. Since failure of the pipe could result in obvious and significant environmental impacts due to the potential for spillage of raw sewage into the creek, the Lakehaven Utility District seeks to bring about a suitable repair of the crossing which will result in adequate long-term cover over the pipe to protect it within the stream channel at the crossing. Obvious benefits of preventing pipe breakage or leakage at that location would be to avoid serious environmental consequences and interruptions in service. 6c. Indicate the project category. (check all that apply) Jhei ❑ Commercial ❑ Residential ® Institutional ❑ Transportation ❑ Recreational ® Maintenance ® Environmental Enhancement (Protection) 6d. Indicate the major elements of your project. (check all that apply) [help] ❑ Aquaculture ❑ Culvert ❑ Float ❑ Retaining Wall ® Bank Stabilization ❑ Dam / Weir ❑ Floating Home (upland) ❑ Boat House ❑ Dike / Levee / Jetty ❑ Geotechnical Survey ❑ Road ❑ Boat Launch ❑ Ditch ❑ Land Clearing ❑ Scientific Measurement Device ❑ Boat Lift ❑ Dock / Pier ❑ Marina / Moorage ❑ Stairs ❑ Bridge ❑ Dredging ❑ Mining ❑ Stormwater facility ❑ Bulkhead ❑ Fame ❑ Outfall Structure SwimmingPOO ❑ BuoyEl ❑ Ferry Terminal ❑ Piling/Dolphin ❑ Utility Line ® Channel Modification ❑ Fishway ❑ Raft ❑ Other: 6e. Describe how you plan to construct each project element checked in 6d. Include specific construction methods and equipment to be used. [,n_e pj • Identify where each element will occur in relation to the nearest waterbody. • Indicate which activities are within the 100-year floodplain. The detailed construction sequence below is also included on Sheet 15 of the attached plans. 1) Install all temporary erosion control measures, general and site -specific, as noted on the plans and supporting documents or as required by various permits and authorizations. 2) Under the supervision of the Stream Restoration Consultant, construct a sandbag and plastic coffer dam (or approved alternate) across the stream channel at or upstream of the limit of the affected in -stream work area, to create a pool. Place flexible diversion pipe of sufficient size to carry flow and any fish in the upstream pool to a point downstream of the downstream limit of the work area. This diversion pipe may be moved from side to side as needed to stay out of the way during in -stream channel re-formation activities. Alternatively, flow may be pumped around the work area. If a pump is used, the pump intake is to be screened by an inner screen with maximum 1/8-inch mesh to keep fish from entering the pump and an outer screen with maximum 1/2-inch mesh to retain debris. The inner screen area is to be large enough to ensure velocities through the screen of less than 0.4 feet per second under maximum expected flows during the period of project duration. The discharge is to be positioned to minimize erosion or turbidity resulting from the discharge velocity of the water. JARPA Revision 2015.1 Page 8 of 27 3) Construct a second sandbag and plastic dam across the downstream limit of the affected work area to retain any silt -laden water that may collect as a result of implementation activities. Collected silt -laden water is to be pumped to upland areas for discharge, biofiltration, and/or infiltration. 4) Any fish isolated in the localized in -stream work area will be removed by the Stream Restoration Consultant. Given the size and characteristics of Cold Creek, it is expected that stranded fish can be located and captured using dipnets or small seines, followed by electrofishing. Efforts to capture and relocate fish by netting methods are to precede electrofishing. Captured fish are to be released in unaffected reaches upstream and downstream of the project area. 5) It is anticipated that a spyder-type hoe or excavator will be used to place the wood and rock materials in the streambed to re-form it, with these materials delivered to within reach by a chute system from a staging area upslope. 6) Excavate any depressions in the stream channel bottom to accommodate the placement of proposed log structures. Any such excavation is anticipated to be minimal, generally as required to accommodate rootwads which may otherwise tend to prop some logs up too high along the profile. Any non -gravel or non -rock spoils generated may be used to re -grade stream banks above ordinary high water only. 7) Place the majority of the specified woody materials along the affected channel section as shown and positioned on the plans prior to placing the specified gravel/cobble/boulder cascade mix (see specifications and below). Anchor as and where indicated. Four types of woody materials are specified for this project: 1) upright cedar or fir rootwads, 2) cedar tree tops with limbs, 3) cedar or fir trunks with root wads, and 4) detached cedar limbs (small woody debris). All or nearly all of the wood in the first three categories (that is, excluding small woody debris) is to be placed prior to placing the specified gravel/cobble/boulder cascade mix. Some small woody debris is also to be placed initially, with the remainder interspersed with the rock mix as it is placed. Modify or remove short sections of filter fencing, where present, as necessary to allow log structure placement. 8) Place the specified gravel/cobble/boulder mix, interspersed with the remaining small woody debris, between and amongst the placed wood structures. Place these materials, as detailed, to form the desired cascade habitat consisting of numerous and varied, somewhat random, short plunges interspersed with shallow pools. Coordinate with the Stream Restoration Consultant to individually place and position the larger, specimen boulders to achieve this effect and functioning. 9) Install pipe restraints and anchors on the 8-inch sewer and 18-inch storm pipes as shown on the plans. Place specified rock materials over and around an exposed 8-inch ductile iron sanitary sewer line entering the manhole on the left (west) bank. 10) Following completion of in -stream work, ensure that silt fencing is installed and in good condition along both streambanks bordering areas to be planted, and any other disturbed areas. 11) Any silt -laden water collecting in the in -stream work area is to be allowed to settle or dissipate prior to reconnecting the de -watered work area to the flowing stream by removal of first the downstream then the upstream sand bag and plastic dams and associated bypass piping. 12) A manhole on the right (east) bank is covered over by soils that have slid down the steep ravine sideslope. This manhole and the area immediately around it are to be avoided during construction, but it is to be exposed and manhole risers added to bring the rim to existing grade, then fine -graded after in -stream work is complete and before excavating or grading equipment leaves the site. See detail 1, Sheet C5.0. 6f. What are the anticipated start and end dates for project construction? (Month/Year) Leilil ■ If the project will be constructed in phases or stages, use JARPA Attachment D to list the start and end dates of each phase or stage. Start date: July 16. 2016 End date: September 30, 2016 ❑See JARPA Attachment D 6g. Fair market value of the project, including materials, labor, machine rentals, etc. Ihelpj Approximately $250,000. 6h. Will any portion of the project receive federal funding? LPip] ■ If yes, list each agency providing funds. ❑ Yes ® No ❑ Don't know JARPA Revision 2015.1 Page 9 of 27 Part 7—Wetlands: Impacts and Mitigation ® Check here if there are wetlands or wetland buffers on or adjacent to the project area. (If there are none, skip to Part 8.) l2p] 7a. Describe how the project has been designed to avoid and minimize adverse impacts to wetlands. LqeM ❑ Not applicable Access to the project area will need to pass through delineated wetland areas. Given the location of the project area in the bottom of a steep -sloped ravine with seeps along the sideslopes, it would not be possible to avoid all direct impacts to critical areas and/or their associated buffers, and no other feasible or less -impacting options for site access are available. An existing dirt access road and staging area remaining from previous sewer line work exists part way up the ravine sideslope, and will be utilized. From there downslope, a spyder-type hoe will be used to move and place materials across the steep and rugged terrain. This equipment can "walk" after a fashion across ravine sideslope areas vegetated with native shrubs. This will do less damage to vegetation than conventional equipment. Little or no grading of wetlands is proposed beyond re -exposing a presently -buried sewer manhole top. Wetland impacts are limited to vegetation impacts due to needs for site access and so are temporary. A wetland and buffer mitigation plan is included consisting primarily of a native revegetation plan including soils amendments if and where needed, erosion control, and performance monitoring with contingencies. 7b. Will the project impact wetlands? hl eipl ® Yes ❑ No ❑ Don't know 7c. Will the project impact wetland buffers? < ® Yes ❑ No ❑ Don't know 7d. Has a wetland delineation report been prepared? Li-eip] • If Yes, submit the report, including data sheets, with the JARPA package. ® Yes ❑ No 7e. Have the wetlands been rated using the Western Washington or Eastern Washington Wetland Rating System? heir ■ If Yes, submit the wetland rating forms and figures with the JARPA package. ® Yes ❑ No ❑ Don't know 7f. Have you prepared a mitigation plan to compensate for any adverse impacts to wetlands? [heipt • If Yes, submit the plan with the JARPA package and answer 7g. • If No, or Not applicable, explain below why a mitigation plan should not be required. ® Yes ❑ No ❑ Not applicable JARPA Revision 2015.1 Page 10 of 27 7g. Summarize what the mitigation plan is meant to accomplish, and describe how a watershed approach was used to design the plan.[ttipj As described above, only temporary wetland impacts associated with disturbance to vegetation would occur. The mitigation plan consists primarily of a native revegetation plan for wetland and buffer areas disturbed in the process of gaining site access for necessary repairs to a sanitary sewer line crossing of Cold Creek. Erosion control and performance monitoring with contingencies are included. The plan is intended to maintain and restore native vegetated conditions consistent and compatible with conditions in the subbasin, which is characterized as a wooded ravine draining developed residential areas. Non-native plant species encountered within and adjoining the bounds of the revegetation plan or mitigation area will be removed and disposed of off - site in a manner which prevents their spread. 7h. Use the table below to list the type and rating of each wetland impacted, the extent and duration of the impact, and the type and amount of mitigation proposed. Or if you are submitting a mitigation plan with a similar table, you can state (below) where we can find this information in the plan. [l e Activity (fill, Wetland Wetland Impact Duration Proposed Wetland drain, excavate, Name' type and area (sq. of impact3 mitigation mitigation area flood, etc.) rating ft. or type (sq. ft. or category2 Acres) acres Disturb for Access Wetland A Il] 5,075 ft2 < 3 months R 5,075 square ft. ' if no official name for the wetland exists, create a unique name (such as "Wetland V). The name should be consistent with other project documents, such as a wetland delineation report. 2 Ecology wetland category based on current Western Washington or Eastern Washington Wedand Rating System. Provide the wetland rating forms with the JARPA package. 31ndicate the days, months or years the wetland will be measurably impacted by the activity. Enter "permanent' if applicable. "Creation (C), Re-establishmentlRehabiiitation (R), Enhancement (E), Preservation (P), Mitigation Banwin-lieu fee (B) Page number(s) for similar information in the mitigation plan, if available: 7i. For all filling activities identified in 7h, describe the source and nature of the fill material, the amount in cubic yards that will be used; and how and where it will be placed into the wetland. hel Not applicable. Substrate materials will be placed within the Cold Creek stream channel, but no wetlands are proposed to be filled in association with this project. 7j. For all excavating activities identified in 7h, describe the excavation method, type and amount of material in cubic yards you will remove, and where the material will be disposed. hl� Not applicable. No wetlands are proposed to be excavated in association with this project. JARPA Revision 2015.1 Page 11 of 27 Part 8—Waterbodies (other than wetlands): Impacts and Mitigation In Part 8, "waterbodies" refers to non -wetland waterbodies. (See Part 7 for information related to wetlands.) i ® Check here if there are waterbodies on or adjacent to the project area. (If there are none, skip to Part 9.) 8a. Describe how the project is designed to avoid and minimize adverse impacts to the aquatic environment. e i ❑ Not applicable The shortest stream length practicable is proposed to be disturbed to provide adequate and durable cover for the sewer line. Protection of the sewer line is needed in and of itself to protect the aquatic environment from potential raw sewage discharges to the stream should the sewer line be broken or damaged to the extent that leakage or spillage would occur. Rounded gravel, cobble and gravel substrate materials will be used in combination with densely packed large and small woody debris to form cascade habitat at and immediately downstream of the sewer line crossing location. This is a well -functioning and beneficial habitat type for use by fish and other aquatic wildlife. Wetland and buffer impacts will be mitigated by implementation of the wetland mitigation plan, including primarily 5075 square feet of wetland revegetation. These plan improvements will occur with adequate temporary sedimentation and erosion controls, and detectable water quality impacts in Cold Creek are not anticipated. Direct Effects on Salmonids Water Quality (substrate disturbance discharge of waste „products, and turbid runoff from disturbed uplands): Placing large woody debris and substrate materials consisting of rounded gravel, cobbles, and boulders waterward of the OHWIVI could produce temporary, localized sediment plumes that would dissipate following cessation of activity. The proposed project would not create and/or cause hazardous or toxic wastes or other products to be released into the water. Rather, the project's primary purpose is to prevent or greatly reduce the risk of such discharges should the sewer line become damaged or broken to the extent that it leaks or discharges to the stream. Construction would be completed using a spyder-type hoe to be positioned within the stream while flow is diverted, or above the OHWM. The proposed project would not affect water quantity or water temperature within Cold Creek. To minimize construction impacts associated with increased turbidity during construction, the following timing restrictions and conditions are proposed: a) Once started, large woody debris and substrate placement is estimated to take less than three weeks. Construction would begin as soon as permits and scheduling would allow, but no in -water work (wood and substrate placement) would occur from 1 October through 15 July, or as otherwise permitted by the regulatory agencies. b) The contractor shall stockpile any construction materials in designated staging areas above the OHWM. c) All construction debris shall be properly disposed of on land in such a manner that it cannot enter into the waterway or cause water quality degradation (Section 13, Rivers and Harbors Act). d) The work area will be isolated by constructing a sand bag and plastic barrier, water filled bladder, or "super sack" dams above and below the work area and diverting stream flows around the work area during in -stream work activities. Any fish would be safely removed from the so -isolated work area, and any silt -laden water collecting in it would be pumped to upland areas for discharge, biofiltration, and/or infiltration. Discharge to the available sanitary sewer system will serve as a contingency. e) Erosion and sediment control measures would be implemented as appropriate during and following placement of the proposed log structures and streambed substrate materials, including measures for both the short-term and permanent stabilization of exposed soils. Turbidity is generally considered an undesirable condition for salmonids. Exposure to turbid water can result in lethal and sublethal effects on salmonids. However, localized temporary turbidity from an individual construction activity would not represent a permanent sediment source and would not produce conditions of chronic exposure, but exposure could be acute. Considering that the turbidity produced by construction activities would be localized and temporary, the most probable impact on juvenile salmonids would be a behavior modification JARPA Revision 2015.1 Page 12 of 27 (avoidance response) rather than injury or reduction in growth potential. An effective strategy for minimizing or eliminating potential construction -related impacts is to restrict construction to periods when the presence of anadromous salmon is improbable. The fish -protection prohibition on in -water construction is expected to result in an allowable in -water construction window of 16 July through 30 September. This window is adequate to minimize the probability that anadromous salmonids would be present in the action area during construction, though cutthroat trout could be present. The precautionary conditions that have been proposed would also minimize the potential for the release of waste products or construction debris to the stream. Noise: Streambed substrate and log placement is proposed. Therefore, some noise and vibration will be generated by the proposed project. Minimizing fish exposure to potentially loud noise -generating activities by following scientifically based, construction -timing restrictions is an accepted method for avoiding or minimizing adverse effects on listed species. In order to minimize the impacts of construction noise on salmonids, the above timing restriction (no in -water construction from 1 October through 15 July) would be followed. This restriction is adequate to minimize the probability that salmonids would be in the action area during construction. Thus, noise impacts would be insignificant and/or discountable. Habitat Health (riparian vegetation): Placement of streambed substrate and large woody debris will temporarily affect streamside vegetation in the immediate area. However, placement of large woody debris below the OHWM will improve site -specific fish and wildlife habitat functions, and vegetation restoration will be addressed through implementation with a native revegetation mitigation plan addressing disturbed wetland and both stream and wetland buffer areas. Given the project location at the bottom of a wooded ravine, the stream is presently well -shaded and will remain so with only minor and temporary interruptions due to project implementation. Thus, short-term impacts to vegetated habitat would be insignificant and/or discountable, while long-term impacts will likely be beneficial. Direct Mortality: The potential to kill salmonids exists to the extent that they could be present in the action area during construction activities. In order to minimize the impacts of construction activities on salmonids, the above timing restriction (no in -water work at a minimum from 1 October through 15 July) would be followed. This restriction along with the presence of migration barriers downstream (see Photo 8, below) is adequate to minimize the probability that juvenile or adult salmonids (with the possible exception of cutthroat trout) would be present in the action area during construction. Indirect Effects on Salmonids The proposed project may change refuge, foraging, and migration conditions for juvenile salmonids, and refuge and migration conditions for adults. The proposed project will result in an improvement over existing conditions through the placement of large woody debris below the OHWM and will restore vegetated conditions, to the extent they are disturbed, through the re -planting of native plant species adjacent to the stream. Thus, the implementation of the proposed project may improve foraging, refuge, and migration conditions for salmonids in the project area over the existing condition. Overall, this project would improve habitat conditions both above and below the OHWM. Thus, implementation of this project would not detract from current habitat conditions in the area, and will likely benefit salmonids because refuge, migration, and foraging conditions will likely improve to a modest to moderate degree within the project area. All in -water work would be conducted during agency -approved windows using best management aractices for temporary erosion and sedimentation control. 8b. Will your project impact a waterbody or the area around a waterbody? wi I ® Yes ❑ No JARPA Revision 2015.1 Page 13 of 27 8c. Have you prepared a mitigation plan to compensate for the project's adverse impacts to non -wetland waterbodies? Lieiil e If Yes, submit the plan with the JARPA package and answer 8d. • If No, or Not applicable, explain below why a mitigation plan should not be required. ® Yes ❑ No ❑ Not applicable See also attached plans and response to 8d. A native revegetation plan is included as mitigation for wetland and both stream and wetland buffer areas where vegetation must be disturbed in order to provide access for proposed in -stream work. A primary purpose of the project is to protect fish, other aquatic life, terrestrial wildlife, and people from the detrimental water quality impacts that would be associated with a raw sewage spill or leakage that could result from possible damage to or breakage of the sewer line pipe at or near its crossing location of Cold Creek. To that extent, it may be considered to be at least in part self -mitigating because it will, by intent and through its implementation, result in lower risks and a clear, significant net benefit to in -stream and riparian fish and wildlife habitat. 8d. Summarize what the mitigation plan is meant to accomplish. Describe how a watershed approach was used to design the plan. • If you already completed 7g you do not need to restate your answer here.[Lelpj As described above, only temporary stream and wetland buffer and direct wetland impacts would occur associated with disturbance to vegetation. The mitigation plan was prepared mainly to address unavoidable wetland impacts and consists primarily of a native revegetation plan for wetland and both wetland and stream buffer areas (riparian areas) disturbed in the process of gaining site access for necessary repairs to a sanitary sewer line crossing cf Ccld Creek. Erosion control and per fcrmance mcnitcring vrith contingencies are included. The plan is intended to maintain and restore native vegetated conditions consistent and compatible with conditions in the subbasin, which is characterized as a wooded ravine draining developed residential areas. Non-native vegetation encountered within and adjoining the bounds of the revegetation plan or mitigation area will be removed and disposed of off -site in a manner which prevents their spread. Another aspect of the stream "mitigation plan" is that it is essentially an integrated component of the overall project which includes habitat enhancements while reducing the risks of habitat degradation from reduced water quality should the sewer line become damaged to the point of leakage or outright breakage. Stream enhancements include creation of cascade habitat through the dense placement of woody materials in a matrix of rounded gravel, cobble and boulder materials to form cascade habitat. This will occur along a short streambed section which has been subject to erosion and downcutting. The present channel condition, which includes a debris jam, is likely a barrier to upstream fish movements whereas the proposed cascade feature or habitat would be passable. See also response to 8a. 8e. Summarize impact(s) to each waterbody in the table below. gial Activity (clear, Waterbody Impact Duration of Amount of material Area (sq. ft. or dredge, fill, pile name' location2 impact3 (cubic yards) to be linear ft.) of drive, etc.) placed in or waterbody removed from directly affected waterbody Fill Cold Creek In Permanent 200 yd3 75 linear ft., 1,800 square ft. Fill Cold Creek Adjacent Permanent 75 yd3 1,000 square ft. JARPA Revision 2015.1 Page 14 of 27 ' If no official name for the waterbody exists, create a unique name (such as "Stream 1") The name should be consistent with other documents provide 2Indicate whether the impact will occur in or adjacent to the waterbody. If adjacent, provide the distance between the impact and the waterbody and indicate whether the impact will occur within the 100-year flood plain. a Indicate the da s, months or ears the waterbod will be measurably im acted b the work. Enter" ermanent" if a livable. 8f. For all activities identified in 8e, describe the source and nature of the fill material, amount (in cubic yards) you will use, and how and where it will be placed into the waterbody. Ltlel The stream channel will be re-formed extending for approximately 75 feet downstream of an existing trunk sewer line crossing of Cold Creek by the placement of woody materials embedded in placed streambed substrate materials consisting of a well -graded mixture of rounded boulders, cobbles, and gravels. Woody materials will be sourced from ongoing timber harvest or land clearing operations and the rounded rock substrate materials will be sourced from local gravel -mining pits. Adjacent to Cold Creek, an 8-inch sewer lateral from the southwest will be stabilized by adding quarry spall fill over the sewer pipe, surfaced with rounded gravel and cobbles. 8g. For all excavating or dredging activities identified in 8e, describe the method for excavating or dredging, type and amount of material you will remove, and where the material will be disposed. IOq 3 Little excavating or dredging will occur and no soil or rock materials will be removed from the site. Minor excavation may occur in the streambed, but only through previously -placed rock armoring materials and/or recently -deposited sediments, and only to the extent needed to form depressions to accept root wads such that they may be placed as low as desired in the channel. As mentioned, an existing sewer manhole cover is now buried and will be re -exposed as part of the project. Only materials originally disturbed during sewer line construction or recently disturbed by localized soil instability or tree falls will be excavated to re -expose this manhole. A spyder-type hoe or excavator will be used for all of these activities. Part 9—Additional Information Any additional information you can provide helps the reviewer(s) understand your project. Complete as much of this section as you can. It is ok if you cannot answer a question. 9a. If you have already worked with any government agencies on this project, list them below. �heipi Agency Name Contact Name Phone Most Recent Date of Contact Washington Department Larry Fisher, WDFW Area (425) 313-5683 11/23/2015 (email) of Fish and Wildlife Habitat Biologist Puyallup Tribal Russ Ladley, Resource (253) 680-5568 11/23/2015 (email) Fisheries Protection Manager City of Federal Way Matt Herrera, AICP Senior Planner (253) 835-2638 2/25/2016 (email) U.S. Army Corps of Kaitlyn White project Manager, (206) 316-3156 (email) 2/13/2015 email Engineers Regulatory Branch JARPA Revision 2015.1 Page 15 of 27 9b. Are any of the wetlands or waterbodies identified in Part 7 or Part 8 of this JARPA on the Washington Department of Ecology's 303(d) List? pieipl • If Yes, list the parameter(s) below. ■ If you don't know, use Washington Department of Ecology's Water Quality Assessment tools at: http.,I/www.ecy.wa-gov/prog[ams/wg/303d/. ❑ Yes ® No 9c. What U.S. Geological Survey Hydrological Unit Code (HUC) is the project in? L! ,ipi • Go to http://cfpub.eua.caoy/surf/locate/index.cfm to help identify the HUC. 17110013-03 (Lower Duwamish) 9d. What Water Resource Inventory Area Number (WRIA #) is the project in? [hc-lpj • Go to http://www.ecy_wa_qov/services/cais/maps/wria/wria.htm to find the WRIA #. WRIA 9, Duwamish River Basin. Cold Creek, WRIA 09-0385 9e. Will the in -water construction work comply with the State of Washington water quality standards for turbidity? hei Go to http://www.ecy_wa,qov/programs/wc0swgs/criteda.htm] for the standards. ® Yes [_1 No ❑ Not applicable 9f. If the project is within the jurisdiction of the Shoreline Management Act, what is the local shoreline environment designation? Lrelpl • If you don't know, contact the local planning department. ■ For more information, go to: httpalwww.ecv.wa., ocLvlprograms/sea/sma/laws rules/173-26/211 designations. html. ❑ Rural ❑ Urban ❑ Natural ❑ Aquatic ❑ Conservancy ❑ Other N/A 9g. What is the Washington Department of Natural Resources Water Type? Le p] • Go to http://www.dnr.wa.goytforest-practices-water-typing for the Forest Practices Water Typing System ❑ Shoreline ® Fish ❑ Non -Fish Perennial ❑ Non -Fish Seasonal 9h. Will this project be designed to meet the Washington Department of Ecology's most current stormwater manual? fheld • If No, provide the name of the manual your project is designed to meet. ❑ Yes ❑ No Not Applicable. The project will not create impervious surface and will not generate stormwater runoff other than from the natural environment. Name of manual: N/A 9i. Does the project site have known contaminated sediment? LeAi If Yes, please describe below. ❑ Yes ® No JARPA Revision 2015.1 Page 16 of 27 >ast, describe below. I_heipl :)n the site. Though it is forested, it is not old growth. 9k. Has a cultural resource (archaeological) survey been performed on the project area? jifm] • If Yes, attach it to your JARPA package. ❑ Yes ® No — Excavation of native soil is not proposed. 91. Name each species listed under the federal Endangered Species Act that occurs in the vicinity of the project area or might be affected by the proposed work. hl ell According to PHS data on the web (accessed January 11, 2016), coho salmon (O. kisutch) are shown to occur in the project vicinity and action area along Cold Creek (stream #09-0385). The presence of winter steelhead (Oncorhynchus mykiss), fall Chinook salmon (Oncorhynchus tshawytscha) or bull trout (Salvelinus conf/uentus) is not indicated by the PHS data for the site, however WDFW's SalmonScape website mapping indicates the modeled presence of Chinook and steelhead beginning at and extending downstream from roughly the project area. Coho salmon are not ESA listed but are included in this category for Federal Essential Fish Habitat (EFH) purposes. Their presence in the project area is mapped as presumed (as opposed to documented) by SalmonScape. However, a steep cascade migration barrier was observed and identified downstream of the project area on the Redondo Sewage Treatment Plant site (see Photo 8, below) which, in addition to the small stream size, makes the actual presence of any of these anadromous species within the project area questionable at best. Coho salmon presence is mapped by SalmonScape as documented in the lowermost sections of the stream near the mouth, downstream from the vicinity of this barrier, and also downstream of the project and action areas. All of these species are known to occur in Puget Sound, downstream of the project and action areas. Conditions along Cold Creek in the project vicinity and downstream, primarily the identification of the steep cascade migration barrier downstream of the project area, support the conclusion that listed anadromous fish species would not occur in the project area and their presence would be limited and seasonal extending farther downstream within the action area. Of these species, only juvenile coho salmon are expected to be present in the action area, but downstream of the project area, during the seasonal construction window designated for the project. The creek in the project vicinity was judged generally to be too small and too much of a headwater area to be normally used by Chinook salmon or steelhead, though modeled presence is mapped for both by SalmonScape up to near the boundary of the project area. Coho salmon are mapped by SalmonScape as documented to within 0.15 mile downstream of any proposed in -water work with presumed presence extending farther upstream. However, as noted, a downstream migration barrier documented during site visits for the project makes coho salmon presence within the project area highly unlikely as well. In summary, and for the reasons given above, the presence of listed and/or EFH salmonid fish species within the project area, including Chinook and coho salmon, steelhead, and bull trout is highly improbable at any time of year, including the period proposed for in -water work, July 16 through September 30. Only juvenile coho are expected to be present downstream in portions of the action area, but outside the in -water work area, during project implementation. JARPA Revision 2015.1 Page 17 of 27 9m. Name each species or habitat on the Washington Department of Fish and Wildlife's Priority Habitats and Species List that might be affected by the proposed work. Ineipj Coho salmon and resident cutthroat trout are listed on a Priority Habitats and Species Report as being present within the project area and vicinity. Part 10—SEPA Compliance and Permits Use the resources and checklist below to identify the permits you are applying for. ■ Online Project Questionnaire at http:llapps.oria.wa.gov/opas/. • Governor's Office for Regulatory Innovation and Assistance at (800) 917-0043 or helpaoria.wa.pov. • For a list of addresses to send your JARPA to, click on agency addresses for completed JARPA. 10a. Compliance with the State Environmental Policy Act (SEPA). (check all that apply.) hel For more information about SEPA, go to www,ecy.wa.ciovlprograms/sea/sepa/e-review.htmi. ❑ A copy of the SEPA determination or letter of exemption is included with this application. ® A SEPA determination is pending with the Lakehaven Utility District (lead agency). The expected decision date is Spring 2016 [:]I am applying for a Fish Habitat Enhancement Exemption. (check the box below in 10b.) rieina ❑ This project is exempt (choose type of exemption below). ❑ Categorical Exemption. Under what section of the SEPA administrative code (WAC) is it exempt? ❑ Other: ❑ SEPA is pre-empted by federal law. 10b. Indicate the permits you are applying for. (check all that apply.) [hel LOCAL GOVERNMENT Local Government Shoreline permits: (N/A) ❑ Substantial Development ❑ Conditional Use ❑ Variance ❑ Shoreline Exemption Type (explain): Other City/County permits: ❑ Floodplain Development Permit ® Critical Areas Ordinance JARPA Revision 2015.1 Page 18 of 27 STATE GOVERNMENT Washington Department of Fish and Wildlife: ® Hydraulic Project Approval (HPA) ❑ Fish Habitat Enhancement Exemption — Attach Exem Lion Form You must submit a check for $150 to Washington Department of Fish and Wildlife, unless your project qualifies for an exemption or alternative payment method below. Do not send cash. Check the appropriate boxes_ ❑ $150 check enclosed. Check # Attach check made payable to Washington Department of Fish and Wildlife. ❑ My project is exempt from the application fee. (Check appropriate exemption ❑ HPA processing is conducted by applicant -funded WDFW staff. Agreement # ❑ Mineral prospecting and mining. ❑ Project occurs on farm and agricultural land_ (Attach a copy of current land use classification recorded with the county auditor, or other proof of current land use.) ❑ Project is a modification of an existing HPA originally applied for, prior to July 10, 2012. HPA # Washington Department of Natural Resources: ❑ Aquatic Use Authorization Complete DARPA Attachment E and submit a check for $25 payable to the Washington Department of Natural Resources. Do not send cash. Washington Department of Ecology: ® Section 401 Water Quality Certification FEDERAL GOVERNMENT United States Department of the Army permits (U.S. Army Corps of Engineers): ® Section 404 (discharges into waters of the U.S.) ❑ Section 10 (work in navigable waters) United States Coast Guard permits: ❑ Private Aids to Navigation (for non -bridge projects) JARPA Revision 2015.1 Page 19 of 27 •rep' i��� - .. i n r� Photo 4 — Project area along Cold Creek facing upstream. Limbs and debris have formed a jam, collecting gravel and providing tenuous cover for the pipe beneath the streambed. 11/6/15 Photo 5 — Facing northeast across and slightly downstream at the Cold Creek sewer line crossing location. The pipe now lies below limbs and accumulated gravel. 11/6/15 JARPA Revision 2015.1 Page 22 of 27 �• -sti �' '�.. -��" �' � �...'+--�vr.-^w Ewa � �' �''!` . - P-W7 45, , i ..., -� TV Y..1 • ... '. •. .'`�t:ir; "'"t ,•r . ,�-• ;,-fir o �. � - .� tom• r . Photo 8 — Existing impassable cascades on the lower part of the treatment plant site, 11/6/15. Photo 9— Lower channelized Cold Creek stream section passing through a landscaped residential area approaching the mouth. Puget Sound is in the background. 11/6/15. JARPA Revision 2015.1 Page 24 of 27 Photo 10— Mouth of Cold Creek at Puget Sound, facing northeasterly along the shore. Redondo Beach Drive S. is to the, right.11/6/15. Photo 11— Mouth of Cold Creek at Puget Sound, facing southwesterly along the shore. 11/6/15. JARPA Revision 2015.1 Page 25 of 27 Photo 12— Existing condition of construction access route. 3l91I5. JARPA Revision 2015.1 Page 26 of 27 Part 11--Authorizing Signatures Signatures are required before submitting the JARPA package. The JARPA package includes the DARPA form, project plans, photos, etc.[helpi 11 a. Applicant Signature (required) nMM 1 certify that to the best of my knowledge and belief, the information provided in this application is true, complete, and accurate. I also certify that I have the authority to carry out the proposed activities, and I agree to start work only after I have received all necessary permits. hereby authorize the agent named in Part 3 of this application to act on my behalf in matters related to this application. ,. (initial) By initialing here, I state that I have the authority to grant access to the fiery. I also give my consent to the permitting agencies entering, the property where the project is located to inspect the project site or any work related to the project. (initial) Applicant Printed Name Applica�JSignature i Date 11 b. Authorized Agent Signature el I certify that to the best of my knowledge and belief, the information provided in this application is true, complete, and accurate. I also certify that I have the authority to carry out the proposed activities and I agree to start work only after all necessary permits have been issued. 16 Le- rn n �]a 3� �.S- Authb zed Agent Printed Dame Authorized Agent Signature Date Grll-�,e„t 11c. Deft Owner Signature (if not applicant) hel . Not required if project is on existing rights -of -way or easements. I consent to the permitting agencies entering the property where the project is located to inspect the project site or any work. These inspections shall occur at reasonable times and, if practical, with prior notice to the landowner. 9rQpo4 Owner Printed Name —Roopeft�-Cwner Signature Date 18 U.S.0 §1001 provides that: Whoever, in any manner within the jurisdiction of any department or agency of the United States knowingly falsifies, conceals, or covers up by any trick, scheme, or device a material factor makes any false, fictitious, or fraudulent statements or representations or makes or uses any false writing or document knowing same to contain any false, fictitious, or fraudulent statement or entry, shall be fined not more than $10,000 or imprisoned not more than 5 years or both. if you require this document in another format, contact the Governor's office for Regulatory Innovation and Assistance (ORIA) at (800) 917-0043. People with hearing loss can call 711 for Washington Relay Service. People with a speech disability can call (877) 833-6341 _ ORIA publication number: ENV-019-09 rev. 09/2015 JARPA Revision 2015.1 Page 30 of 30 I CRITICAL AREA REPORT pZMMMD MAR 2 4 2016 CM CF FEDERAL WAS! CD5 Cold Creek Exposed Sewer Trunk Line Cover and Stabilization Prepared for: Ken Miller, P. E., Engineering Manager Lakehaven Utility District 31623 1st Avenue South P. O. Box4249 Federal Way, WA 98063 Prepared by: 2 THE WATERSHED COMPANY 750 Sixth Street South Kirkland. WA 98033 p 425.822.5242 f 425.827.8136 watershedco.com March 2016 The Watershed Company Reference Number: 140809 The Watershed Company Contact Person: Andy Noone Cite this document as: The Watershed Company. March 2016. Critical Area Report, Cold Creek Exposed Sewer Trunk Line Cover and Stabilization. Printed on 3G% recycled paper. The Watershed Company March 2016 TABLE OF CONTENTS Page # 1 Project Description.............................................................................1 2 Existing Conditions............................................................................4 2.1 Setting.............................................................................................................4 2.2 Wetlands..........................................................................................................4 2.3 Fish and Wildlife Habitat Conservation Areas..............................................5 2.4 Geologically Hazardous Areas.......................................................................6 2.5 Critical Aquifer Recharge Areas....................................................................6 2.6 Frequently Flooded Areas..............................................................................6 3 Regulations........................................................................................10 3.1 Wetlands........................................................................................................10 3.2 Fish and Wildlife Habitat Conservation Areas............................................11 3.3 Geologically Hazardous Areas.....................................................................12 3.4 Critical Aquifer Recharge Areas..................................................................12 3.5 Frequently Flooded Areas............................................................................12 3.6 Partial Exemptions........................................................................................13 3.7 State and Federal Regulations.....................................................................13 4 Impact Assessment..........................................................................13 4.1 Proposed Impacts.........................................................................................13 4.2 Impact Analysis.............................................................................................14 4.2.1 No Net Loss......................................................................................................14 5 Mitigation Approach.........................................................................15 5.1 Mitigation Sequencing..................................................................................15 6 Mitigation Plan...................................................................................17 6.1 Goals and Objectives....................................................................................17 6.1.1 Performance Standards..................................................................................17 6.1.2 As -built Plan.....................................................................................................18 6.1.3 Monitoring Methods.........................................................................................18 6.1.4 Construction Notes and Specifications.........................................................19 6.1.5 General Work Sequence.................................................................................. 20 6.1.6 Maintenance..................................................................................................... 20 6.1.7 Contingency plans and adaptive management ............................................ 21 6.1.8 Material Specifications and Definitions......................................................... 21 7 Summary............................................................................................22 8 Limitations.........................................................................................22 9 References.........................................................................................24 Cold Creek Exposed Sewer Trunk Line Cover and Stabilization, Critical Area Report The Watershed Company March 2016 Appendix A Mitigation Plan Appendix B Wetland and Stream Delineation Report (The Watershed Company, 2016) LIST OF FIGURES, PHOTOS, AND TABLES Figure 1. Vicinity and street level maps showing the location of the proposed project.... 3 Photo 1. The previously exposed pipe crossing of Cold Creek. 10/7/2014 ......................6 Photo 2. The exposed pipe acted as a weir or grade control, subject to undermining. Note cascades both above and below the pipe -weir. 10/7/14.................. 7 Photo 3. The exposed pipe is located slightly above and just to the left of the center of thephoto. 10/7/14...................................................................................7 Photo 4. Project area along Cold Creek facing upstream. Limbs and debris have formed a jam, collecting gravel and providing tenuous cover for the pipe beneath the streambed. 11/6/15...........................................................................8 Photo 5. Across and slightly downstream at the Cold Creek sewer line crossing location, facing northeast. The pipe now lies below limbs and accumulated gravel. 11/6/15..................................................................................................... 8 Photo 6. Existing impassable cascades on the lower part of the treatment plant site. 11/6/15..................................................................................................... 9 Photo 7. Existing condition of construction access route. 3/9/15.....................................9 Table 1. On -site Wetlands, Classifications, and Buffer Widths.....................................10 Table 2. Wetland Mitigation Ratios...............................................................................11 The Watershed Company March 2016 j J CRITICAL AREA REPORT COLD CREEK EXPOSED SEWER TRUNK LINE COVER AND STABILIZATION PROJECT DESCRIPTION This critical area report is prepared as part of a proposal to cover and protect a sewer trunk line that crosses Cold Creek in the City of Federal Way. For several years prior to November 2015, a 24-inch steel sanitary pipe crossing Cold Creek was exposed. In the exposed condition, the sewer pipe functioned as a weir and was vulnerable to damage and failure due to undermining, falling trees and landslides. Since failure of the pipe would result in significant environmental impacts resulting from spillage of raw sewage into the creek, the Lakehaven Utility District proceeded with plans to adequately protect the pipe. However, significant storm events in November 2015 resulted in high stream flows and movement of woody materials which, in turn, helped to rebury the pipe with sediments. Since the materials covering the pipe are considered unstable and temporary, the Lakehaven Utility District has decided to proceed with modified plans to supplement the existing cover materials and to reform the stream channel to ensure that the pipe is adequately protected. The design supplements the existing cover materials by filling an area about 75 feet long and 30 feet wide with a rounded -rock streambed substrate mixture to form cascades. The mixture will be installed to a depth ranging up to 4 feet, beginning immediately downstream of the sewer pipe. The substrate mixture has been sized large enough and otherwise formulated to be stable under conditions of extreme stream flows, up to the 100-year event, at the relatively steep gradient needed. As such, the proposed substrate mixture includes large gravel, cobbles, and boulders for stability, but is also well -graded such that smaller silt, sand, and small gravel particles are included. Rock is specified to be rounded rather than angular to improve habitat and better match natural conditions for the project setting. Fines and small gravels are included to help stabilize the larger cobbles and boulders, and to limit subsurface flows. The plans have also been designed to enable fish passage, even with the steep gradient. Woody materials including logs, root wads, and limbs will also be included in the materials used to re-form the channel. Cold Creek Exposed Sewer Trunk Line Cover and Stabilization, Critical Area Report The Watershed Company March 2016 Since the project site is densely vegetated and surrounded by steep slopes, it may be difficult to provide access to the site for materials and equipment. The project site will be accessed from a poorly -maintained dirt access road along a ravine slope to the east. Tn order to minimize impacts to existing vegetation, a spyder excavator will be used. Rock and wood materials will be brought on -site on small trucks to the existing access and staging area part way up the ravine slope. Conventional equipment will be stationed there to feed materials down the ravine slope to the spyder excavator working below. Boulders may be rolled down the slope on the ground or on steel plates or other type of chute system. Gravelly materials and fines may be fed down the ravine sideslope using a half - pipe or other type of chute. At the bottom of the ravine, the spyder will place the larger woody pieces first and then place the rock materials and smaller woody materials over and around them to form the cascade habitat feature described above. An access corridor for materials and equipment down the ravine slope would be less than 20 feet wide. A manhole on the right (east) bank is covered over by soils, possibly from the root ball of a maple tree that fell down next to it. This manhole will be located, but avoided and left covered during in -stream work. It will be exposed by the spyder as it leaves the site after the other work is done. Stream flows will be diverted around the work area during in -stream work following safe fish removal and exclusion procedures as shown on the plans and described in the notes. Any accumulating silty seepage water will be collected and infiltrated and or biofiltered in areas along the stream channel. If this proves to be ineffective or otherwise infeasible, such turbid water will be discharged through one of two manholes in the area to the sanitary sewer system, as a contingency. This project will occur in and adjacent to several critical areas including Cold Creek, unnamed wetlands, and a designated geologically hazardous area. The following report meets the critical area report requirements of Federal Way Revised Code (FWRC) 19.145.080 by providing a description of the on -site conditions and characterization of all critical areas in and adjacent to the project area. This report also includes a description of the mitigation sequencing actions undertaken, as well as the mitigation plan that was developed to ensure there is no net loss in critical area functions and values. 2 The Watershed Company March 2016 �yomm L� • r Kehl rrr-• t s t r Figure 1. Vicinity and street level maps showing the location of the proposed project. 3 Cold Creek Exposed Sewer Trunk Line Cover and Stabilization, Critical Area Report The Watershed Company March 2016 Z EXISTING CONDITIONS 2.1 Setting The proposed project is located on Cold Creek in a forested ravine surrounded by single-family residences within the City of Federal Way. Cold Creek is a direct tributary of Puget Sound and lies within Water Resources Inventory Area 9 (Green-Duwamish). The project site is located about 1/3 of a mile upstream from the mouth of the creek. The project site is also approximately 275 feet upstream of the Lakehaven Utility District Redondo Treatment Plant, on the northeast corner of parcel #1862700470. The 12-acre parcel is owned by the City of Federal way and is zoned as R-15.0, or residential, single-family with one unit allowed per 15,000 square feet. The subject parcel is designated as Single Family, Medium Density in the City of Federal Way's Comprehensive Plan. The northern boundary of the parcel acts as the boundary line between the City of Des Moines and the City of Federal Way. The site is accessed through an unmaintained dirt road from the Lakehaven Redondo Sewage Treatment facility, which is at the end of Sound View Drive South. The property is undeveloped and densely vegetated. There are no buildings on the property. However, on site there is a stormwater drain pipe along with the Lakehaven Sewer Trunk line, an 8-inch feeder line, and two access manholes. 2.2 Wetlands A wetland delineation was completed in the project area by The Watershed Company in September of 2015 (Appendix B). Two wetlands were identified in the vicinity of the project area. Wetland A is a slope wetland occupying a large portion of the project area and extending downslope to the banks of Cold Creek. The wetland area originates upslope of the dirt access road and crosses the road about 120 feet south of the north parcel boundary. Wetland A is comprised of forested and scrub -shrub Cowardin vegetation communities. Prominent vegetation includes red alder, salmonberry, red -osier dogwood, stink currant, skunk cabbage, lady fern, and piggy -back. Wetland A was rated using the Western Washington Wetland Rating System (Ecology, Aug 2004, version 2) (Rating System). Under this rating system Wetland A received five points for water quality functions, five points for hydrologic functions, and six points for wildlife habitat functions, for a total of 16 points. This score qualifies Wetland A as a Category III wetland. Wetland B is located at the extreme northeast corner of the parcel just northeast of the dirt access road at the base of a large wooden retaining wall. Groundwater 4 The Watershed Company March 2016 ^� continuously seeps through the interstitial spaces between the wooden boards comprising the retaining wall. The wetland continues off -site above the retaining wall. The delineated area of this wetland is sparsely vegetated and is comprised of a forested Cowardin vegetation community. Under the rating system, Wetland B received five points for water quality functions, six points for hydrologic functions, and five points for wildlife habitat functions, for a total of 16 points. This score qualifies Wetland B as a Category III wetland. 2.3 Fish and Wildlife Habitat Conservation Areas Project activities will occur in and directly adjacent to Cold Creek. Cold Creek is a first -order, Type F perennial stream that originates from Easter Lake, where it flows northerly about 1.5 miles before it empties directly into Puget Sound. The project site is located about 1/3 of a mile upstream from the mouth of the stream, and approximately 275 feet upstream of the Lakehaven Utility District Redondo Treatment Plant From the source, Easter Lake, the stream flows underground at times and through residential areas for about a half -mile before it enters the densely - vegetated ravine. In and along the ravine, the vegetated riparian buffer expands to 300 feet or more at some points. Downstream of the project site, the stream flows under a chain link fence as it enters the Lakehaven Utility District Redondo I Treatment Plant then through a long, baffled culvert and over a 4-foot cascade on the treatment plant premises. Below the plant, the stream flows through a road culvert, passes several sparsely vegetated residential properties, continues under Redondo Beach Drive South and spills into Puget Sound. The width of the stream channel in the study area varies from eight to twenty feet. On the WDFW SalmonScape mapping tool, fall Chinook salmon and winter steelhead have modeled presence in the bottom reach of Cold Creek, below the proposed project site. An observed steep cascade migration barrier downstream of the project site indicates that anadromous salmonid fish presence in the project area is unlikely. Chinook or steelhead presence has not been documented or modeled at the project site. According to SalmonScape, coho salmon have i been documented in the bottom reach of Cold Creek and are presumed to occur upstream of the project site, although the documented cascade suggests that I upstream presence is unlikely. On the WDFW Priority Habitats and Species A (PHS) mapping tool, resident coastal cutthroat trout and coho salmon are ' mapped to occur and migrate in the Cold Creek Basin. The project area contains high -functioning habitat. The area is classified as a biodiversity area and corridor on the WDFW PHS mapping tool. Throughout the Cold Creek ravine there are multiple vegetative strata. The multiple strata provide structural complexity that enables a diversity of foraging and nesting opportunities for terrestrial wildlife. The ravine is densely vegetated and J 5 J Cold Creek Exposed Sewer Trunk Line Cover and Stabilization, Critical Area Report The Watershed Company March 2016 relatively free of invasive species. Vegetation includes: bigleaf maple, red alder, western hemlock, Douglas fir, western red cedar, salmonberry, red -osier dogwood, sword fern, red -elderberry, devil's club, stink currant, skunk cabbage, and lady fern. The stream also provides amphibian habitat. 2.4 Geologically Hazardous Areas The proposed project area is designated by the City of Federal way as a Landslide Hazard Area and an Erosion Hazard Area. The project area is with a ravine, surrounded by steep slopes on either side. Slopes vary from 10-20% at the bottom of the ravine to 30-60% on the walls of the ravine, getting as steep as 70% in some places. Please see the separately prepared geotechnical report for more information. 2.5 Critical Aquifer Recharge Areas The proposed project area does not he within or adjacent to a mapped critical aquifer recharge area. 2.6 Frequently Flooded Areas Photo 1 The proposed project area does not lie within or adjacent to any FEMA mapped 100-year floodplains. 2 iL The previously exposed pipe crossing of Cold Creek. 4, 10/7/2014 C Sewer Pip it Cold Creek Exposed Sewer Trunk Line Cover and Stabilization, Critical Area Report The Watershed Company March 2016 Photo 4. Project area along Cold Creek facing upstream. Limbs and debris have formed a jam, collecting gravel and providing tenuous cover for the pipe beneath the streambed. 11/6/15 Photo 5. Across and slightly downstream at the Cold Creek sewer line crossing location, facing northeast. The pipe now lies below limbs and accumulated gravel. 11/6/15 The Watershed Company March 2016 M Photo 6. Existing impassable cascades on the lower part of the treatment plant site. 11/6/15 Photo 7. Existing condition of construction access route. 3/9/15 E Cold Creek Exposed Sewer Trunk Line Cover and Stabilization, Critical Area Report The Watershed Company March 2016 3 REGULATIONS Critical areas, including wetlands, fish and wildlife habitat conservation areas, and geologically hazardous areas, in the City of Federal Way are regulated by the City's Environmentally Critical Areas regulations (FWRC Chapter 19.145). 3.1 Wetlands The delineated wetlands are both located within the City of Federal Way and thus subject to the FWRC. Under the Code, wetlands are classified as one of four categories based on the Rating System (2014). As described previously, Wetland A scored five points for water quality functions, five points for hydrologic functions, and six points for habitat functions for a total of 16 points. Wetland B scored a total of five points for water quality functions, six points for hydrologic functions, and five points for habitat functions, for a total of 16 points. The cumulative scores qualify both wetlands as Category III. Wetland buffers in Federal Way are determined based on a combination of the wetland category and the habitat score. Category III wetlands with six or seven habitat points (i.e., Wetland A) are required to have a standard buffer width of 165 feet, and Category III wetlands with a habitat score of five points (i.e., Wetland B) are required to have a standard buffer width of 105 feet (FWRC 19.145.420.2). Table 1. On -site Wetlands, Classifications, and Buffer Widths Wetland Habitat Score Total Score Category Wetland A 6 points 116 points I Category III 165 feet Wetland B 15 points 116 points I Category III 105 feet 'Per FWRC 19.145.420.2 Development within wetlands is regulated by FWRC 19.145.430. Development within wetlands is allowed if the location and extent of development within the wetland is the minimum necessary as determined through mitigation sequencing. Development in wetlands are evaluated based on the following criteria: • It will not adversely affect drainage or stormwater retention capabilities; • It will not lead to unstable earth conditions nor create erosion hazards; • It will not be materially detrimental to any other property in the area of the subject property nor to the city as a whole, including the loss of open space; ■ It will result in no net loss of wetland area, function or value upon completion of compensatory mitigation; ■ The project is in the best interest of the public health, safety or welfare; 10 The Watershed Company March 2016 • The applicant has demonstrated sufficient scientific expertise and supervisory capability to carry out the project; and -1 • The applicant is committed to monitoring the project and to making corrections if the project fails to meet projected goals. Compensatory mitigation is required fall all development impacts within wetlands that cannot be avoided or minimized and must achieve equal or greater biological functions. Wetland mitigation can be achieved through creation, re- establishment, rehabilitation and enhancement. Each of these mitigation strategies requires a different mitigation ratio pursuant to FWRC 19.145.430.5. 1 Category III wetlands such as those in the project area are required to meet a 2:1 ` ratio for creation and re-establishment, a 4:1 ratio for rehabilitation, and a 8:1 ratio for enhancement. Any wetland impacts require a detailed mitigation plan and maintenance and monitoring plan to ensure performance standards are met and ecological values and functions are achieved. Table 2. Wetland Mitigation Ratios Development within wetland buffers is not allowed, except as allowed in FWRC 19.145.120 and 19.145.440. See section 3.6 for more details. 3.2 Fish and Wildlife Habitat Conservation Areas Fish and wildlife habitat conservation areas (FHWCA) include streams, regulated lakes, areas with federally endangered, threatened, or sensitive species, state priority habitats associated with state priority species and habitats of local importance. Cold Creek would be considered a FWHCA. Stream buffers are determined by stream classification. Streams are classified into one of four categories in accordance with the Washington State Department of Natural Resources water typing system. Since Cold Creek is not inventoried as a shoreline of the state and has documented fish presence in the lower reach, it is classified as a Type F stream. Type F streams are required to have a standard buffer width of 100 feet (FWRC 19.145.270.1). The project site is designated as a biodiversity area/corridor by WDFW. It is also designated as coastal resident cutthroat trout habitat. While Chinook salmon and steelhead are federally designated threatened species that are modeled to use the lower reach of Cold Creek (use is not documented), there are no known federally designated endangered or threatened species within the project area. There are no known habitats or species of local importance within the project area and the project is not within the vicinity of any regulated lakes. 11 Cold Creek Exposed Sewer Trunk Line Cover and Stabilization, Critical Area Report The Watershed Company March 2016 Pursuant to FWRC 19.145.330 stream buffer intrusions may be permitted if the applicant prepares a buffer enhancement plan that demonstrates that the project will not adversely affect water quality, habitat, or drainage capabilities. The project also must not lead to timstable earth conditions and must not be materially detrimental to any property in the area or the city as a whole. Lastly, the project must be necessary for the reasonable development of the subject property. All activities located in water bodies used by fish must give special consideration to the preservation and enhancement of anadromous fish habitat pursuant to FWRC 19.145.390. Accordingly, project activities must be timed to occur only during the allowable work window designated by WDFW and projects must be designed so that they will not result in a net degradation of the functions and values of fish habitat or other critical areas; any impacts to functions and values must be mitigated in accordance with an approved critical area report. Furthermore, any proposed activity that is adjacent to a habitat conservation area where federally threatened species have a primary association shall be protected through measures in accordance with this critical areas report. Approval of this project shall not occur prior to consultation with WDFW and other appropriate federal or state agencies (FWRC 19.145.400). 3.3 Geologically Hazardous Areas Geologically hazardous areas including areas susceptible to landslides, erosion, and/or seismic hazards are regulated under FWRC 19.145, Article II. The Cold Creek ravine where the proposed project would take place is mapped by the City of Federal Way to be both a landslide hazard area and an erosion hazard area. Landslide hazard areas are required to have a standard buffer width of 50 feet, as measured from the top and toe of the slope, as well as along the sides of the slope. Erosion hazard areas do not contain standard buffers, but must follow the recommendations of a geotechnical engineer or engineering geologist. Seismic hazard areas are not mapped for the City of Federal Way; any potential seismic hazard will be assessed by a qualified geotechnical engineer. 3.4 Critical Aquifer Recharge Areas Critical aquifer recharge areas are regulated by the City under Article V of FWRC 19.145. The project site is not located in a designated wellhead or aquifer capture zone. 3.5 Frequently Flooded Areas Frequently flooded areas are regulated by the City under Article VI of FWRC 19.145. There are no FENIA designated frequently flooded areas within the project vicinity. 12 The Watershed Company March 2016 I 3.6 Partial Exemptions Given the wetland, FWHCA, and landslide hazard critical areas and associated buffer encumbrances on the property, it would not be possible to avoid all direct impacts to critical areas and/or their associated buffers. Under FWRC 19.145.120, public facilities, utilities, and improvements qualify for a partial exemption to the critical areas provisions of the Code. Impacts to critical areas and their buffers may be allowed if no feasible alternative with less impacts exists, and the location and extent of the impact is the minimum necessary to meet the requirements of the public utility. Intrusions into critical areas must attempt to protect and mitigate impacts to critical area functions and values. Impacts to critical areas and buffers would require preparation of a mitigation plan, restoration of the temporarily impacted areas, and five years of monitoring and - , maintenance. 3.7 State and Federal Regulations Wetlands and streams are also regulated by the U.S. Army Corps of Engineers (Corps) under section 404 of the Clean Water Act. Any filling of Waters of the U.S., including wetlands (except isolated wetlands), would likely require notification and permits from the Corps. Federally permitted actions that could affect endangered species (i.e. Chinook salmon, steelhead, or bull trout) may also require a biological assessment study and consultation with the U.S. Fish and Wildlife Service and/or the National Marine Fisheries Service. Application for Corps permits may also require an individual 401 Water Quality Certification and Coastal Zone Management Consistency determination from the Washington Department of Ecology. The Washington Department of Fish and Wildlife (WDFW) also regulates State waters. Specifically, WDFW must review, condition, and approve or deny "any construction activity that will use, divert, obstruct, or change the bed or flow of State waters." 4 IMPACT ASSESSMENT 4.1 Proposed Impacts Overall, the proposed project involves approximately 2,250 square feet of ` temporary impacts to the stream, including stream substrate installation and woody debris installation. In addition to the impacts to the stream, there will be 1 temporary impacts associated with site access and movement of equipment and materials. It is estimated that access to the site from the access road will temporarily impact approximately 6,755 square feet of wetland buffers. The _ proposed project will also cause temporary impacts to approximately 5,075 ` 13 J Cold Creek Exposed Sewer Trunk Line Cover and Stabilization, Critical Area Report The Watershed Company March 2016 square feet of wetland areas. In order to restore areas of temporary impact and mitigate for any temporal loss associated with impacts, a mitigation plan has been proposed which includes planting of native vegetation and invasive weed control. 4.2 Impact Analysis Placement of streambed substrate and large woody debris will temporarily affect streamside vegetation in the immediate area. However, placement of large woody debris below the OHWM will improve site -specific fish and wildlife habitat functions, and vegetation restoration will be addressed through implementation of a native revegetation plan addressing disturbed wetland and both stream and wetland buffer areas. Given the project location at the bottom of a wooded ravine, the stream is presently well -shaded and will remain so with only minor and temporary interruptions due to project implementation. Thus, short-term impacts to vegetated habitat would be insignificant and/or discountable, while long-term impacts will likely be beneficial. The project includes habitat enhancements while reducing the risks of habitat degradation from reduced water quality should the sewer line become damaged to the point of leakage or outright breakage. Stream enhancements include the dense placement of woody materials in a matrix of rounded gravel, cobble and boulder materials to form cascade habitat. This will occur along a short streambed section which has been subject to erosion and downcutting. The present channel condition, which includes a debris jam, is likely a barrier to upstream fish movements whereas the proposed cascade feature or habitat would be passable. The plan is intended to maintain and restore native vegetated conditions consistent with and compatible with conditions in the subbasin, which is characterized as a wooded ravine draining developed residential areas. Non- native vegetation encountered within and adjoining the bounds of the revegetation plan or mitigation area will be removed and disposed of off -site in a manner which prevents their spread. Native vegetation will be installed and maintained after construction is completed to offset any impacts associated with construction. 4.2.1 No Net Loss The included mitigation plan is designed to ensure that there is no net loss of ecological function as a result of the project. The proposed mitigation activities will compensate for the anticipated temporary impacts described above. The mitigation plan proposes to install native vegetation throughout the impact areas. 14 The Watershed Company March 2016 i In total, the mitigation plan seeks to restore 11,830 square feet of impacted wetland area and stream and wetland buffer area. This mitigation plan results in a 1:1 restoration to impact area ratio. During construction, two small alder trees will need to be removed; the mitigation plan calls for planting 10 western red cedar trees, resulting in a net gain in tree density. In addition, construction of the cascades and placement of the woody debris has the potential to improve fish access and may improve anadromous fish habitat. The mitigation plan may increase habitat function and value over existing conditions by removing invasive species and increasing diversity. Overall, the project represents no net loss of the functions and values over the existing condition. This project also helps to ensure that the sewer line stays covered and protected and therefore avoids a potentially disastrous rupture of the sewer pipe which would result in obvious and significant ecological impacts. J MITIGATION APPROACH The proposed project includes modification of wetlands, FWHCAs, geologically hazardous areas and associated buffers. Mitigation sequencing has been employed per section 19.145.130 of the FWRC and mitigation has been designed pursuant to FWRC 19.145.140. 5.1 Mitigation Sequencing The applicant has designed the project to avoid, minimize and compensate for project impacts to the greatest extent possible given the constraints of the site. The following describes how the requirements of FWRC 19.145.130 will be met. Avoid While the sewer pipe is currently buried, the materials covering the pipe are considered transient, unstable and temporary. As the woody materials holding the sediment in place decompose, the sewer pipe is likely to become re -exposed again. In an exposed state, the sewer pipe over Cold Creek is vulnerable to undermining and/or rupture from storm events. In order to avoid significant ecological damage and a potential stoppage in service, the Lakehaven Utility District determined that immediate preventative action was necessary and unavoidable. Thus, there is no means by which to permanently cover and stabilize the pipe without incurring temporary critical area and buffer impacts. J 15 Cold Creek Exposed Sewer Trunk Line Cover and Stabilization, Critical Area Report The Watershed Company March 2016 Minimize The impacts associated with the project have been minimized to the greatest extent possible. In designing the plans, the stream channel construction was kept at a fairly steep gradient so that the length of channel affected as well as the quantity of rock material needing to be placed are minimized. A spyder excavator will be utilized during construction. The spyder excavator will create more limited impacts than a traditional tread excavator. The spyder excavator is also more precise and maneuverable, which will enable the operator to minimize impacts to existing vegetation. Rolling boulders and sending gravel through a chute system downslope will enable the spyder excavator to make fewer trips up and down the slope, further minimizing impacts associated with construction. Additional construction and design options were considered and discarded for the preferred alternative that is both cost feasible and minimizes impacts to the greatest extent. Options considered included digging up the pipe to encase it in concrete, extending the slope downstream further to lower the gradient, and flying in materials via helicopter. Rectify Temporary construction related impacts will be restored to pre -construction condition or better through the implementation of a mitigation plan that involves installation of native plants. Reduce or eliminate the impact over time A five-year maintenance and monitoring plan as well as long-term site protection measures are proposed as part of this project. Compensate A mitigation plan is proposed to compensate for impacts resulting from construction. The mitigation plan includes removal of invasive species and installation of native plants. Additionally, the stream cascades and woody debris may result in improved fish access and habitat. Monitor A five-year maintenance and monitoring plan is proposed to ensure success of required mitigation measures and to ensure that rectifying actions will be taken based upon findings over time. 16 The Watershed Company March 2016 G MITIGATION PLAN This plan serves as a restoration plan for proposed temporary impacts to Cold Creek, wetland, steep slope, and buffer areas associated with stabilization of a I sewer trunk line that crosses Cold Creek in the City of Federal Way. 6.1 Goals and Objectives Goal: Restore habitat functions that may have been interrupted due to temporary impacts to wetland, stream, and steep slope critical areas and their buffers. 1. Restore soils removed or compacted along equipment access and staging area at north end of construction area. 2. Establish dense and diverse native tree, shrub, and groundcover vegetation where damaged during construction. 3. Remove and control invasive weeds from restoration areas. 6.1.1 Performance Standards The performance standards (PS) listed below will be used to judge the success of the plan over time. If the standards are met at the end of the five-year monitoring period, the restoration site will be considered successful and the project will have met all critical area permitting obligations. PS 1. Soils: a. Temporarily -placed sand, gravel, hog fuel, and/or other fill materials will be j absent from equipment access and staging area at north end of construction ` area. b. Soils will be decompacted prior to planting. } c. Soils will be amended with compost prior to planting. - } PS 2. Survival/diversity: a. 100% survival of all woody plantings at the end of year one. This standard may be met through establishment of installed plants or by replanting as necessary to achieve the required numbers. ! ' b. 80% survival of all woody plantings at the end of year two. This standard may be met through establishment of installed plants or by replanting as i necessary to achieve the required numbers. Survival beyond year two is difficult to track. Therefore, a diversity standard is proposed in place of survival (below). Areas planted entirely with live cuttings, or dense groundcover/emergent plantings, shall not be held to the 80% survival 17 Cold Creek Exposed Sewer Trunk Line Cover and Stabilization, Critical Area Report The Watershed Company March 2016 standard. Any such areas that exhibit widespread mortality shall be re- evaluated by the restoration specialist to ascertain the site -specific viability of the cuttings. PS 3. Native woody vegetation cover: a. Achieve at least 60% cover of native woody species by the end of Year 3. Volunteer species may count towards this standard. b. Achieve at least 80% cover of native woody species by the end of Year 5. Volunteer species may count towards this standard. PS 4. Diversity: _ a. Establish at least 1 native tree species, 5 native shrub species, and 2 native groundcover by the end of Year 5. PS 5. Invasive species standards: No more than 10% cover of invasive species in any of the planting areas, in any monitoring year. More than 5% cover of invasive weeds in any year will trigger maintenance weeding. 6.1.2 As -built Plan An as -built plan will be prepared within 30 days of substantially complete construction of the restoration area. The as -built plan will document substantial conformance with these plans and also will disclose any substitutions or other non -critical departures. The as -built plan will establish baseline plant installation quantities (based on sample counts or invoices), and photo points that will be used throughout the monitoring period to measure the performance standards over time. The as -built documentation should include a markup of the original plan noting any departures, plus the location of photo points. 6.1.3 Monitoring Methods This monitoring program is designed to track the success of the restoration site over time by measuring the degree to which the performance standards listed above are being met. Monitoring shall occur twice annually for five years. A spring monitoring visit shall record necessary replanting, weeding, invasive control, and other maintenance needs. The constructed in -stream habitat features including the log structures will also be inspected in the spring once each year for five years following construction to identify any maintenance or repairs that would need to be done during the upcoming low -flow season. Stream channel, stream bank, and log structure functioning would be assessed. Examples of stream channel maintenance or repair might include stabilizing any eroding streambanks or securing any logs that may threaten to be washed downstream. The Restoration 18 The Watershed Company March 2016 �. Specialist will notify the owner and/or maintenance crews of necessary early season maintenance. The second visit shall occur in late summer or fall and contain the bulk of the monitoring work. The annual monitoring report will relate the following information: 1. General summary of the spring visit. } 2. First- and second -year counts of surviving and dead/dying woody plants. 3. Estimates of native woody species cover in restoration areas using the cover class method. 4. Estimates of invasive species cover in restoration areas using the cover class method. 5. Counts of established native species to determine site diversity. 6. Notes and/or sketches of invasive weeds or bare areas. 7. Photographic documentation from established reference points. 8. Intrusions into the planting areas, vandalism, trash, and other actions detrimental to the overall health of the restoration area. 9. Recommendations for maintenance in the restoration area. 6.1.4 Construction Notes and Specifications Note: Specifications for items in bold can be found under "Material Specifications and Definitions." Note: The Watershed Company personnel [(425) 822-5242], or other persons i qualified to evaluate environmental restoration projects, shall monitor: J 1. All site preparation. a. Invasive weed management and soil preparation. i 2. Plant material inspection. a. Plant material delivery inspection. _1 b. Plant installation inspection. 19 Cold Creek Exposed Sewer Trunk Line Cover and Stabilization, Critical Area Report The Watershed Company March 2016 6.1.5 General Work Sequence Following completion of construction, remove any temporarily -placed fill materials and associated underlying fabric from equipment access and staging area. 2. Remove all invasive weeds and weed roots from entire planting area as directed by the Restoration Specialist. Avoid damage to existing native vegetation. 3. Soil preparation and planting sequence shall vary by planting area type. Refer to W6 Restoration Planting Plan for detailed soil preparation and planting instructions by planting area type. 4. Install vegetation per the planting plans and planting details. 5. All plant installation shall take place during the dormant season (October 15 through March 1), during frost free periods, for best survival. 6. Install blanket application of wood chip mulch in restoration areas 4 inches deep. To prevent rot, pull mulch back from the stems of installed plants. Note: to the extent that wood chip mulch meeting specifications has been substituted for hog fuel to provide construction access, and as long as it remains free from contamination and debris, it may be re -used as mulch. 6.1.6 Maintenance This site will be maintained for five years following completion of the construction. Specifications in bold can be found under "Material Specifications and Definitions." 1. Replace each plant found dead in the summer monitoring visits during frost - free periods only in the upcoming fall dormant season (October 15 to March 1) for the first two monitoring years. Replace plants as directed in subsequent monitoring reports. 2. Follow the recommendations noted in the spring monitoring site visit. 3. General weeding for all planted areas: a. At least twice yearly, remove all competing grass and weeds, including roots, from beneath each -installed plant and any desirable volunteer vegetation to a distance of 18 inches from the main plant stem. Weeding should occur at least twice during the spring and summer. Frequent weeding will result in lower mortality and lower plant replacement costs. 20 The Watershed Company March 2016 b. More frequent weeding may be necessary depending on weed conditions that develop after plan installation. c. Do not weed the area near the plant bases with string trimmer (weed whacker/weed eater). Native plants are easily damaged or killed, and weeds easily recover after trimming. 4. Apply slow release granular fertilizer to each installed plant annually in the 1 spring (by June 1) of Years 2 through 5. 5. Mulch the weeded areas beneath each plant with wood chips as necessary to maintain a 4-inch-thick mulch layer and keep down weeds. 6.1.7 Contingency plans and adaptive management These plans have been prepared to ensure success to the maximum practicable extent. Quality and consistency of installation, maintenance, weather pattern i extremes, wildlife damage, vandalism and other factors can singly or in j combination change conditions at mitigation sites and affect eventual success of these plans. Therefore, adaptive management should be employed to evaluate problems as they arise and develop flexible and practical solutions. Examples can include but are not limited to plant substitution, changes in target vegetation classes, soil amendment, and re -grading. As a last resort, modification of performance standards can be necessary. Any actions involving major departures from the original plan or goals and performance standards should be y discussed and agreed to with regulatory agencies ahead of implementation. 6.1.8 Material Specifications and Definitions 1. Compost: Compost shall meet WSDOT Standard Specifications for Road, Bridge, and Municipal Construction, 9-14.4(8) for Fine Compost. Amendment quantity required for construction: 7.5 cubic yards. 2. Fertilizer: Slow release, granular fertilizer such as OsmocoteTM or equal product. Most retail nurseries carry this product. Follow manufacturer's instructions for application. Keep fertilizer in a weather -tight container while on site. Note that fertilizer is to be applied only in years two, three, four and Jfive and not in the first year. Fertilizer shall not be placed in inundated areas. 3. Restoration Specialist: The Watershed Company personnel [(425) 822-52421 ` { or other persons qualified to evaluate environmental restoration projects. 1 4. Wood chip mulch: Wood chip mulch shall meet WSDOT Standard Specifications for Road, Bridge, and Municipal Construction for Bark or Wood Chips as defined by 9-14.4(3). "Bark or wood chip mulch shall be derived from Douglas -fir, pine, or hemlock species. It shall not contain resin, 21 Cold Creek Exposed Sewer Trunk Line Cover and Stabilization, Critical Area Report The Watershed Company March 2016 tannin, or other compounds in quantities that would be detrimental to plant life. Sawdust shall not be used as mulch." Quantity required: 145 cubic yards. Bark or wood chips when tested shall be according to WSDOT Test Method T 123 prior to placement and shall meet the following loose volume gradation: Minimum I Maximum 2" 1 95 1 100 No. 4 1 0 1 30 7 SUMMARY Under this plan, the applicant seeks to permit a construction project that modifies Cold Creek and ensures that an existing sewer pipe crossing the creek stays buried and protected. The proposed project will result in impacts to wetlands, FWHCAs, and geologically hazardous areas and associated buffers. A partial exemption is requested under FWRC 19.145.120 to proceed with the work. Mitigation sequencing was implemented to ensure impacts were avoided, minimized and mitigated for to the greatest extent possible. A mitigation plan is proposed to ensure there is no net loss of ecological functions and values as a result of the project. The proposed mitigation plan will compensate for limited vegetation impacts through removal of invasive species and installation of a diverse mix of native trees, shrubs and groundcover species that are suitable for the area. Stream modification may also result in improved fish access and habitat due to installation of woody debris. A 5-year maintenance and monitoring plan will help ensure the success of the project long term. H LIMITATIONS The information contained in this report is based on the application of technical guidelines currently accepted as the best available science and in conjunction with the manuals and criteria outlined in this document. All discussions, conclusions and recommendations reflect the best professional judgment of the author(s) and are based upon information available to us at the time the study 22 The Watershed Company March 2016 was conducted. All work was completed within the constraints of budget, scope, and timing. The findings of this report are subject to verification and agreement by the appropriate local, State and Federal regulatory authorities. No other warranty, expressed or implied, is made. 23 Cold Creek Exposed Sewer Trunk Line Cover and Stabilization, Critical Area Report The Watershed Company March 2016 9 REFERENCES Environmental Laboratory. 1987. "Corps of Engineers Wetlands Delineation Manual," Technical Report Y-87-1, US Army Engineer Waterways Experiment Station, Vicksburg, Miss. Hruby, T. 2004. Washington State wetland rating system for western Washington - Revised. Washington State Department of Ecology Publication # 04-06-025. King County iMap: Interactive Property Mapping Tool. (http://www.kingcounty.gov/operations/GIS/Maps/iMAP.aspx). Data downloaded 12/2014. National Marine Fisheries Service. 2008. Endangered Species Act- Section 7 Consultation Final Biological Opinion and Magnuson -Stevens Fishery Conservation and Management Act Essential Fish Habitat Consultation on the Implementation of the National Flood Insurance Program in the State of Washington Phase One Document - Puget Sound Region. U.S. Army Corps of Engineers. 2010. Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Western Mountains, Valleys, and Coast Region (Version 2.0), ed. J. S. Wakeley, R. W. Lichvar, and C. V. Noble. ERDC/EL TR-10- 3. Vicksburg, MS: U.S. Army Engineer Research and Development Center. 24 The Watershed Company March 2016 APPENDIX A Mitigation Plan COLD CREEK SANITARY SEWER TRUNK LINE CROSSING PROJECT THE WATERSHED COMPANY 750 Sixth Street South Kirkland WA 98033 p 425.822 5242 www.watershedco.com Science & Design W � N WO U d' � ras � �_ 0 Q L1J Q Z N o W W H > M � �aw= a Y m o 0 � a .v .. r ��� u - _ �ti� Jew-_--- ^���� 4w� mow`-_:�___•� ^� w .�_ .,�--w --�X-may �>a.• ��� �.����� �+;-~^'_w �` r ��►�� ye�y-Ty ��4Y —w—`W'�iL�`74 Nt ! r'�-�1�t u- C! � .�- i^y,8•-���.`�?```.-:s - �/// ^�^'V Yr. +Y` w� V'+, Y. `7.�� ll J1 Aq-Y '' '1Y = 1..C.' 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L r✓�_��`lf�f � -' �_ f r.■ l+~ , _-Sfr'�f"■ r�r � -ter - pa�ua }�/r 1 ` •!^-�' ' �• ��_ 'r_;e_/ram �_� _ r_ i ti J `-��r r� �■■ r -- ti�—ss� ! ! ---� ~� 1 i rr r it■r Y iF ,�t _ `1 r -� Y ■r■'_r rnor[crCar -' _ I /rl< r r ! 1 I h �r r r r i■ rr - i t \ ' I l r 1 . .PV . i,� r -! �� r! �_-"-` •ti__ r� ■ - .r `r■ / %f �� IJ�` x_ _ ■� �u _ ri■ �1 �1`t11 5 1 r --.� r■f �8 % _._ -~�ia w.i.re rr rr■ =r~lam i `� m 8w III r. rym mob] C Z S z 7 PLANT INSTALLATION DETAILS AND NO - 8 MITIGATION PLAN NOTES SHEET SIZE: ORIGINAL PLAN IS 22' x 34'. -- �+•• NOTES LEGEND SCALE ACCORDINGLY. 1. CRITICAL AREAS DELINEATED BY —DELINEATED COLD CREEK OHWM PROJECT MANAGER: HM e THE WATERSHED COMPANY ON r SEPTEMBER 1, 2015 _ IDELINF�4TED WETLAND DESIGNED: GJ 2. SURVEY RECEIVED FROM TETRA -'� DRAFT DRAFTED: LV VICINITY MAPSTECH. — -WETLAND BUFFER CHECKED: GJ,AR JOB NUMBER: - / 1 � EXISTING CONDITIONS THE WATERSHED COMPANY 2 GRADING PLAN 750 SIXTH STREET SOUTH, KIRKLAND, WA i 3 LARGE WOODY DEBRIS PLACEMENT PLAN 98033. (425) 822-5242 ' OJECi A�A 4 STREAM CHANNEL CROSS AND LONGITUDINAL SECTION T 5 LARGE WOODY DEBRIS DETAILS +MATERIAL SPECS 6 RESTORATION PLANTING PLAN TES EXISTING CONDITIONS 0 10• za• an• ga' rn z 0 w J rn NOT FOR 140809 CONSTRUCTION I SHEET NUMBER: m com+4m-me waW,nm om,wm W1 OF 8 ---------------- zjr 00 '���' �• ~ ! -'°~ '-� -.. _""� —•"� r �i1 '�k` - -4.` , � `►ram _� �~_---- •� _-�,-----wy_ ~ ; �,.`� / y,,-. SEE DETAIL I ON SHEET MO AND NOTES ONC2.0AND C4.0TO - '• r ,r' _--_ _- ' EXPOSE AND RAISE EXISTING— ♦__ MANHOLE. Q'- y _ �' Y_ �_! _�^ r/. WETLAND £XTENDS �' l.,'♦ _'`-�~-- _— — — — r •' --- --ti _ �OWN5L4�FROM � ?{I" !V � �%- - - �y_ _ _�!✓ _ _ _ _- __ ,5 BOUNDARY 7QSTREAM oft 1 1 �� • - _ - •- - 6 .'` - �- /r�rnT• ems... ...� `_r r- � - r74 i.�7�- ±r��_ rl �••! -;' '��`-�v"�rr�'� r��~-F`-• ~�4s yd .. ��!a` /.•f84r` r t ft r ��Y� /! rr�• r. ` ss 26 ` Y �"' / r --'-- rr f' t $ 11 t II SEESHEETC4.0FDA - GRADING THIS AREA. �f r rr ,r - -� � r Jrrt1 ♦` � t1e' �-� -- �-- r� � •ti �. r - . r r' �� rr �t . 4't5,��r 't-'-. - F r, 'r rr t �•' _ rr' .4 _rr rr'�r j APPROXIMATE LIM ITS OF ♦ r� / r r r STREAM BED SUBSTRATE r � [- I t , J r f f-• ! '`� - ♦ti-7�, - - �+ r'•-Jrrrfrr rrr j t PLACEMENT rrr 'tt ♦. tt I f h ��- tt�.»_.. 22" T w"-- __ ---- -- r _� rr/ / fr- ! t r rr r� ■� r I 1 t ---` _ --- -_rr / f f rr r r{a �� ♦ rt I, 't� rr--.------•--_ �.✓ �.� ,� � f� , / err -' . , ------------- .\ 36° 1 A i 1 GRADING PLAN 0 s IV za 40' 4 LEGEND _il, (DELINEATED WETLANDS — DELINEATED OHWM 78 — PROPOSED CONTOUR -7e - -EXISTING CONTOUR APPROX. LIMITS OF STREAMED SUBSTRATE PLACEMENT DRAFT NOT FOR CONSTRUCTION OCOWlghVTTh W"n THE WATERSHED COMPANY 750 Sixth Street south Kirkland WA98033 p 425.822.5242 www.watershedco.com Science & Design W N M O � P64 (D 00 a 0 >- w } I--1 j• -I W J Q � WF- T- _1 � L.1.. xUIzNo W W~Cj M LL LL = O U a w 'T o Q J m UI� a SHEET SIZE: ORIGINAL PLAN IS 22' x 34. SCALE ACCORDINGLY. PROJECT MANAGER: HM DESIGNED: GJ DRAFTED: LV CHECKED: GJ,AR JOB NUMBER: 140809 SHEET NUMBER: W2 OF 8 e ___LEGEND - - - - ----------, r L" DELINEATED OHWM y 'n�% ROOTWAD ws LOG WITH ROOT WAD ws — � Y_ CEDAR TREE TOPS ~~ _ J78— PROPOSED CONTOUR '� _ � �__ _ W£�L41VD WENDS _ — --- ---- — '° — — -- /bowt45L❑4I;oe.� \ �✓\ zo° -- �' �I `�'-- wT------ _ _ BOUNDARY TO STREAM i� ` t -` ` ______ Z_ __ ''� -- - • _ ROOT WAD 18° - , a. _ 1 SEE ANCHORING DETAIL w5 - - - v - - _ - _ _ • �� ! r 3+.0 Win_ ` l.-y O ri �.• `���...r� 80 I 76.. LI LARGE WOODY DEBIS - _ _ - -- - �' . SEE ANCHORING DETAIL ��',\ ��- / l.....r� � " •�` ; ' "/�/�~~r~~ � f � r� ���♦ ��7 Fes_ w l 1 36" t � N LARGE WOODY DEBRIS PLACEMENT PLAN 0 s 10, m EXISTING CONTOUR 1. ANCHOR LOGS INDIVIDUALLY ACCORDING TO THE DETAILS. 2. FINAL LOG STRUCTURE PLACEMENT SHALL BE DIRECTED IN FIELD BY THE RESTORATION CONSULTANT. 3. MINIMIZE DISTURBANCE TO STREAM BANK WHERE POSSIBLE 4. SMALL WOODY DEBRIS PLACEMENT TO BE APPROVED BY RESTORATION CONSULTANT. 5. ALL WOODTO BE INTEGRATED INTO PLACED ROCK - SEE SHEET W4. DRAFT NOT FOR CONSTRUCTION OC pAhf-The M.MhM THE WATERSHED COMPANY 750 Sixth Street South Kirkland WA 98033 p 425.822,5242 www.watershedco.corn Science & Design P4 W L), W 0) N WO c) 00 U p �- W Q Q H W J Q 3: /UtN V > T z < LU o WW >o')LI. 2 O) U 1-4 W a Y � x m Q J O U �+ 0 a rn z 0 Ln ir FJ- ED F- ED SHEET SIZE: ORIGINAL PLAN IS 22" x 34". SCALE ACCORDINGLY. PROJECT MANAGER: HM DESIGNED: GJ DRAFTED: LV CHECKED: GJ, AR JOB NUMBER: 140809 SHEET NUMBER: W3 OF 8 EST. 24' COVER STA:3+841 ELEV:81. CENT fit, 1*81RISJ JAM / EXISTING 24 INCH PIPE (rO F"A[N] n 1 PROPOSED ROUGH- NEDCHA�INELSUBSTRATE. MIX TO CREATE BOULDER CASCADE HABITAT. 1 •,� 50 2+75 3+00 3+25 3+50 3+75 4+00 1 STREAM CHANNEL LONGITUDINAL SECTION BOULDER MIX TO BE TYP. 2' DEEP ON SLOPES 82 8111 — =l 80 11 I I-1 I I=1 I [1 78�1H 1=1 I I I I I —I f I— 1 - INTERSPERSE SMALL WOODY DEBRIS AMONGST ROCK AND LARGE WOODY DEBRIS DURING PLACEMENT -SEE CONSTRUCTION SEQUENCE NOTES. 4+25 4+50 Scale X:1"= 40' 6X Vertical Exaggeration 90 88 86 84 82 80 78 76 74 72 70 68 66 64 62 60 16.00' LOW FLOW CHANNEL r�4.00' , � Rw r7CCP f 1�1 I 1=117 MIX NATIVE SOIL AND PLACED ROCK AT TRANSITION TO SUPPORT REVEGETATION EXTEND BOULDER MIX 2' UP BANK FROM CHANNELBOTTOM i I=1 I I_! [ !� J1 I [=I 11—I . SEE W5 FOR ROCK SRE SCHEDULE 1=1 I II I i= ANCHOR PER DETAILS —� 1 rEl� TfF=I 11=1 11=1 11=1 I E91 E-911=1 11=I I 1 I!u_I 11=1 11-1 I f=1 I I —I 11=1 11E1 I I-1 f1=llE,III ;,III,; 111,;;111,;,111,;ZII, ,111„ rlll,;,Ilf,;,1II ,I It ,lI1„ tIII,;,III,;,III ;,III,; II1,;,111, lII, ,I11, ,III, ,III,I,III,II—$11-111 STREAM CHANNEL CROSS SECTION ( f Scale: 1" = 2' STREAM CHANNEL CROSS AND LONGITUDINAL SECTION DRAFT NOT FOR CONSTRUCTION 2 THE WATERSHED COMPANY 750 Sixth Street South Kirkland WA 98033 p 425.822.5242 www.watershedco.com Science & Design L N W U th co 00 U C7, w 0 U Q Z 0 >- Uj Q CO ,O/ W T WJ� UrIr zN0 �w LU ch U = aY N x A ' J m o O � a U rn z 0 N >a co co C0 SHEET SIZE: ORIGINAL PLAN IS 22' z 34'. SCALE ACCORDINGLY. PROJECT MANAGER: HM DESIGNED: GJ DRAFTED: LV CHECKED: GJ, AR JOB NUMBER: 140809 SHEET NUMBER: W4 OF 8 I PREFERRED OPTION: FACE OF LOG SHALL BE SMOOTH ATTACHTIPPING-PLATE I ANCHORTO CONTINUOUSLY I THREADED BAR, AND PLACE I THE LOG SUCH THAT THE I ROD PASSES THROUGH THE PRE -DRILLED HOLE. I I I I CHANNEL, BANK — LOG ALTERNATIVE OPTION: _ THREADED BAR (OR �/f OIAh1ETER GALVANIZED EYEBOLT) SHALL PASS THROUGH MIN. 12' OF SOLID WOOD. PRE -DRILL PILOT HOLES THROUGH THE CENTER OF LOGS. USE 3' GALVANIZED BRIDGE WASHERS AT EACH END. ONCE NUT IS FIRMLY SECURED, CUT OFF BARIBOLTAPPROX. 114'ABOVETHE ;. NUT AND HAMMER BARIBOLT END TO PREVENT REMOVAL OF NUT. TOP OF NUT SHALL BE FLUSH WITH THE LOG SURFACE- THREADED ROD SHALL EXTEND TO (OR EYE BOLTS SHALL BE CHAINED TO) EARTH ANCHOR SYSTEM CAPABLE OF y ? HOLDING 7,000 LBS MINIMUM IF USING CHAIN IT SHALL BE %' OR? LONG -LINK SELF -COLORED LASHING CHAIN WITH A WORKING LOAD OF 7.000 Las OR MORE. CHAIN SHALL BE A MAXIMUM TWO (2) FEETLONG. DRIVE ANCHOR APPROX. 3- FROM VERTICAL AND 30 u LANDWARD FROM A i7 LINE PARALLEL TO THE BANK (I.E. AIMED % UPSTREAM AND INTO THE BANK) MIN. 7' INTO GROUND. LARGE WOODY DEBRIS TYPICAL ANCHORING DETAIL Scale: NTS � ROOT WAD TYPICAL ANCHORING DETAIL I n l Scale: NITS MATERIALS SPECIFICATIONS 1. Root Wads. Root wads shall be free of rot, native western redcedar or Douglas -fir, minimum 50% cedar, supplied with attached trunks 4 to 7 feet in length above the ground line as the tree grew and a minimum of 18 inches in diameter 4 feet above the ground line. Root masses shall be full and dense to a minimum of 6 feet in diameter. 2. Logs With Attached Rools. Logs with attached roots shall be sound, native cedar or fir, minimum 50% cedar, a minimum of 16 inches in diameter 10 feet from the root end. Attached root wads are to be full and dense to a minimum of 6 feet in diameter. Logs shall be minimum length of 16 feet. 3. Cedar Tree Tops are to be exclusively native western redcedar trees and have abundant attached limbs. They are to have a minimum diameter of 10 inches at the larger end and a minimum length of 20 feet, but need not include the very tip of the tree. 4. Small Woody debris. Supplied Small Woody Debris shall be supplied as detached western red cedar tree limbs. These limbs are to be generously incorporated into the Gravel/Cobble/Boulder backfill materials placed to form cascade habitat at the direction of the Restoration Consultant. Supplied limbs shall consist entirely of an assortment of cedar limbs, base ends 1 1/2 to 3 inches in diameter, minimum length of 3 feet, minimum average length of 5 feet. Such small woody debris is to be tightly packed when quantities are measured. Small logs and rootwads encountered on the site but not specifically shown on the plans are to be incorporated into wood structure complexes and Gravel/Cobble/Boulder backfill materials on an opportunistic basis, at the direction of the Restoration Consultant. 5. GravcllCobblefBoulder mix_ Gravel/Cobble/Boulder mix as specked for this project shall consist of well -graded rounded rock, essentially free from fines, conforming closely to the following size gradation by weight 3/8 to 3 inches 15% 3 to 6 inches 15% 6 to 12 inches 15% 12 to 18 inches 15% 18 to 24Inches 15% 24 to 36 inches 15% 36 inches and larger 10% Anchoring. Anchors shall consist of Manta Ray MR-3 earth anchors (Foresight Products, LLC 1-800-325-5360) or equivalent. Anchors to be driven minimum 7 feet into ground, or per manufacturer's recommendations. Each anchor is to be placed, preferentially, on the upslope, landward side of the log it will be anchoring, and, where feasible, angled into the soil such that the pull exerted on the anchor is in line with the anchor rod. All anchors shall be set and load tested to approximately 5,000 lbs. If MR-3 anchors are unable to achieve specified load rating, then a larger anchor (MR-2 or MR-1) shall be substituted that meets specified load rating. Alternatively, if MR-3 anchors are unable to be driven to desired level, a smaller anchor (MR-4 of MR-88) shall be used and set to the same load rating. LARGE WOODY DEBRIS DETAILS AND MATERIAL SPECIFICATIONS Each Log with attached roots shall be secured to two anchors, attached no closer than approximately 3 feet from the ends such that the two anchors attached to any given log are at least 10 feet from each other. Each root wad Is to be secured with one anchor, attached around the trunk, just above the roots. Anchors shall be chained firmly to the logs they secure, attaching to 3/4-inch diameter galvanized steel eye bolts driven through pilot holes drilled directly through the centers of the logs. Three-inch minimum diameter hot -dip galvanized malleable iron "bridge" washers (available from Portland bolt, http:]1www_pordandbc9LcorrV roducisAvashers+malleable iron washer.html7 fld= CI n-xVuJMCFOJ- OdPriSmDw shag be countersunk and seated below the log surface at each end of each eye bolt (providing a fiat, bark -free surface for each washer will suffice). The eye end of each bolt shall be directed downward and connected to an anchor rod using 1/4-inch min. galvanized steel chain. Care shall be taken to make the anchor connections as short, taut, clean, and unobtrusive as possible to result In a low -profile connection. Once the nut is finely secured, cut off the boh approx. % Inch above the nut, and hammer the bolt end to prevent removal of the nut Any anchor thatfails to reach load capacity shall be removed and either reinstalled successfully nearby or replaced with a largeranchor or driven deeper at the same or a nearby location. If anchors repeatedly fail to meet the loading requirements or otherwise cannot be successfully placed at or near the locations of individual proposed log structures, then the contractor and the Restoration Consultant on behalf of the owner shall confer to determine if those structures should be relocated or deleted from the project. 7. Mulch. Wood chip mulch: Wood chip mulch shall meet WSDOT Standard Specifications for Road, Bridge, and Municipal Construction for Bark or Wood Chips as defined by 9-14.4(3).'Bark or wood chip mulch shall be derived from Douglas fir, pine, or hemlock species. It shall riot contain resin, tannin, or other compounds in quantities that would be detrimental to plant life. Sawdust shall not be used as mulch. Quantity required: 145 cubic yards Bark or wood chips when tested shag be according to WSDOT Test Method T 123 prior to placement and shall meet the following loose volume gradation: Sieve Size Percent Passing Minimum Maximum 2' 95 100 No.4 0 30 8. Compost. Compost shall meet WSDOT Standard Specifications for Road, Bridge, and Municipal Construction, 9-14.4(8) forFne Compost. Quantity required: 7.5 cubic yards DRAFT NOT FOR CONSTRUCTION THE WATERSHED COMPANY 750 Sixth Street South Kirkland WA 98033 I p 425.822.5242 www.watershedco.com Science & Design rrW� �Uy t W 0 (n �{ I --a W nWJ Q V W Cn T J ti/�J I ZN Frww,=I W Q CID Uaaw 0 �x SHEET SIZE: ORIGINAL PLAN IS 22' z 34'. SCALE ACCORDINGLY. O) It N d' M CO O 00 0) Q Q W 0 W LL T N qt X O PROJECT MANAGER: HM DESIGNED: GJ DRAFTED: LV CHECKED: GJ, AR JOB NUMBER: 140809 SHEET NUMBER: W5 OF 8 MULCH PATH TO DEPTH OF 4" - RESTORE TO EXISTING CONDITION kD-- Ss u• _ W y y � ws WETLAND RESTORATION PLANTING TYPICAL �^`^ STEEP SLOPE RESTORATION 1 — '\J��.J PLANTINGTYPICAL awl•= REDTWIG DOGWOOD STAKE SCHEDULE SHRUBS CORNUS SERICEA/ RED TWIG DOGWOOD NOTE: RESTORATION CONSULTANT TO VERIFY LOCATION OF STAKES KCU I VVlla UU%.vv000 01 MR.0 PLANTING TYPICAL QTY SPACING SIZE 150 FIELD LOCATED 4' MIN. STREAMSIDE RESTORATION PLANT SCHEDULE RM Z SHRUBS QTY SPACING SIZE ��[[ �� CORNUS SERICEA/ RED TWIG DOGWOOD 48 ALL 1 GAL. SHRUBSTO RUBUS SPECTABILIS / SALMONBERRY 48 BESPACED 1 GAL. � b N $0 SYMPHORICARPOS ALBUS I SNOWBERRY 32 PER TYPICAL 1GAL. apl GROUNDCOVER AND PERENNIALS' 10.00, ALL SPECIES TO BE SPACED TRIANGULARLY ATHYRIUM FILIX-FEMINA / LADY FERN 442 24" O.C. 1 GAL EMERGENTS 'ALL SPECIES TO BE SPACED TRIANGULARLY POLYSTICHUM MUNITUM / SWORD FERN 504 24" O.C. 1 GAL. NOTE: MIX NATIVE TOPSOIL WITH PLACED BOULDERS AT INTERFACE OF BOULDERS AND STREAM SHORELINE. 1MPORTTOPSOIL AS NEEDED - PLANT. BLANKET MULCH. SEE DETAIL W4.2 'EEP SLOPE RESTORATION PLANT SCHEDULE 20.00' —* TREES CITY SPACING SIZE tapl THUJA PLICATA / WESTERN REDCEDAR 10 ALL TREES AND 2 -3 GAL. SHRUBSTO SHRUBS BESPACED PER TYPICAL +W_] ACER CIRCINATUM /VINE MAPLE 10 1GAL. CORNUS SERICEA/ REDTWIG DOGWOOD 40 1 GAL. PHYSOCARPUS CAPITATUS / NINEBARK 50 1 GAL. �V�(] �f RUBUS SPECTABILIS/ SALMONBERRY 60 1 GAL. GRO�NDCOVERANDPERENNIALS' "ALL SPECIES TO BE INTERSPERSED AND SPACED TRIANGULARLY ATHYRIUM FILIX-FEMINA/ LADY FERN 547 24" O.C. 1 GAL. POLYSTICHUM MUNITUM / SWORD FERN 547 24" O.C. 1 GAL. NOTE: RESTORATION CONSULTANT TO CHECK COMPACTION OF PLANTING AREA PRIOR TO PLANTING. IF RESTORATION CONSULTANT DEEMS SOIL TO BE TOO COMPACTED FOR PLANTING, DECOMPACTTO A DEPTH OF &% PLANT. BLANKET MULCH. WETLAND PLANT SCHEDULE evvvvv 4 SHRUBS QTY SPACING SIZE CORNUS SERICEA/RED TWIG DOGWOOD 12 ALL 1 GAL. 4QJ SHRUBS TO LONICERAINVOLUCRATA/BLACK TWINBERRY 15 BESPACED PER TYPICAL 1GAL. 1 1 o RIBES LACUSTRE I SWAMP GOOSEBERRY 15 1GAL. N RUBUS SPECTABILIS / SALMONBERRY 18 1 GAL. 3d. GROUNDCOVER AND PERENNIALS' ALLSPECIESTORE INTERSPERSED AND SPACED TRIANGULARLY — 20.00' — FILIX"E'11NA l LAK]Y FERN 173 24"O.C. 1 GAL. MER .TS ' kATHYRI.UM ALLSPECIES TO BE SPACED TRIANGULARLY CAREX UB14UPTAI SLOUGH 5EDOE 173 24" O.C. 1 GAL. NOTE: REMOVE HOG FUEL FROM CONSTRUCTION ENTRANCE. DECOMPACT SOIL TO AN W DEPTH. PLACE 2" OF COMPOST. PLANT BLANKET MULCH. TEMPORARY ACCESS ROAD PLANT SCHEDULE E 5 SHRUBS CITY SPACING acde ACER CIRCINATUM / VINE MAPLE S CORNUS SERICEA / RED TWIG DOGWOOD �cf + LONICERA INVOLUCRATA /BLACK TWINBERRY 8 16 16 ALL SHRUBS TO BESPACED PER TYPICAL [ Iypp} PHYSOCARPUS CAPITATUS / NINEBARK 8 4— 20.00' ---� RUBUS SPECTABILIS / SALMONBERRY 16 GROUNDCOVER AND PERENNIALS' 'AiLSPECIES TOBE INTERSPERSED AND SPACED TRIANGULARLY ATHYRIUM FILIX-FEMINA / LADY FERN 218 24" O.C. POLYSTICHUM MUNITUM / SWORD FERN 218 24" O.C. NOTE: REMOVE HOG FUEL FROM CONSTRUCTION ENTRANCE. DECOMPACT SOIL TO AN 8" DEPTH. PLANT. BLANKET MULCH. RESTORATION PLANTING PLAN o 10, 20, 40' 8a 4 SIZE 1 GAL. 1 GAL. 1 GAL. 1 GAL. 1 GAL. 1 GAL. 1 GAL. DRAFT NOT FOR CONSTRUCTION THE WATERSHED COMPANY 750 Sixth Street South Kirkland WA 98033 p 425.822.5242 www.watershedco.com Science & Design ['' rn N W C3 CU Z� h cco 00 v� W W ~ U �U IzN0 WWH>M� = Q a W ' a LLJ Y ° a g o rrt SHEET SIZE: ORIGINAL PLAN IS 22' z 34'. SCALE ACCORDINGLY. PROJECT MANAGER: HM DESIGNED: GJ DRAFTED: LV CHECKED: GJ, AR JOB NUMBER: 140809 SHEET NUMBER: W6 OF 8 PLANT INSTALLATION SPECIFICATIONS GENERAL NOTES QUALITY ASSURANCE 1. PLANTS SHALL MEET OR EXCEED THE SPECIFICATIONS OF FEDERAL, STATE, AND LOCAL LAWS REQUIRING INSPECTION FOR PLANT DISEASE AND INSECT CONTROL. 2. PLANTS SHALL BE HEALTHY, VIGOROUS, AND WELL -FORMED, WITH WELL DEVELOPED, FIBROUS ROOT SYSTEMS, FREE FROM DEAD BRANCHES OR ROOTS. PLANTS SHALL BE FREE FROM DAMAGE CAUSED BY TEMPERATURE EXTREMES, LACK OR EXCESS OF MOISTURE, INSECTS, DISEASE, AND MECHANICAL INJURY. PLANTS IN LEAF SHALL BE WELL FOLIATED AND OF GOOD COLOR. PLANTS SHALL BE HABITUATED TO THE OUTDOOR ENVIRONMENTAL CONDITIONS INTO WHICH THEY WILL BE PLANTED (HARDENED - OFF). 3. TREES WITH DAMAGED, CROOKED, MULTIPLE OR BROKEN LEADERS WILL BE REJECTED. WOODY PLANTS WITH ABRASIONS OF THE BARK OR SUN SCALD WILL BE REJECTED. 4. NOMENCLATURE: PLANT NAMES SHALL CONFORM TO FLORA OF THE PACIFIC NORTHWEST BY HITCHCOCK AND CRONQUIST, UNIVERSITY OF WASHINGTON PRESS, 1973 AND/OR TO A FIELD GUIDE TO THE COMMON WETLAND PLANTS OF WESTERN WASHINGTON & NORTHWESTERN OREGON, ED. SARAH SPEAR COOKE, SEATTLE AUDUBON SOCIETY, 1997. DEFINITIONS 1. PLANTS/PLANT MATERIALS. PLANTS AND PLANT MATERIALS SHALL INCLUDE ANY LIVE PLANT MATERIAL USED ON THE PROJECT. THIS INCLUDES BUT IS NOT LIMITED TO CONTAINER GROWN, B&B OR BAREROOT PLANTS; LIVE STAKES AND FASCINES (WATTLES); TUBERS, CORMS, BULBS, ETC..; SPRIGS, PLUGS, AND LINERS. 2. CONTAINER GROWN. CONTAINER GROWN PLANTS ARE THOSE WHOSE ROOTBALLS ARE ENCLOSED IN A POT OR BAG IN WHICH THAT PLANT GREW. SUBSTITUTIONS 1. IT IS THE CONTRACTOR'S RESPONSIBILITY TO OBTAIN SPECIFIED MATERIALS IN ADVANCE IF SPECIAL GROWING, MARKETING OR OTHER ARRANGEMENTS MUST BE MADE IN ORDER TO SUPPLY SPECIFIED MATERIALS. 2. SUBSTITUTION OF PLANT MATERIALS NOT ON THE PROJECT LIST WILL NOT BE PERMITTED UNLESS AUTHORIZED IN WRITING BY THE RESTORATION CONSULTANT. 3. IF PROOF IS SUBMITTED THATANY PLANT MATERIAL SPECIFIED IS NOT OBTAINABLE, A PROPOSAL WILL BE CONSIDERED FOR USE OF THE NEAREST EQUIVALENT SIZE OR ALTERNATIVE SPECIES, WITH CORRESPONDING ADJUSTMENT OF CONTRACT PRICE. 4. SUCH PROOF WILL BE SUBSTANTIATED AND SUBMITTED IN WRITING TO THE CONSULTANT AT LEAST 30 DAYS PRIOR TO START OF WORK UNDER THIS SECTION. INSPECTION 1. PLANTS SHALL BE SUBJECT TO INSPECTION AND APPROVAL BY THE RESTORATION CONSULTANT FOR CONFORMANCE TO SPECIFICATIONS, EITHER AT TIME OF DELIVERY ON -SITE OR AT THE GROWER'S NURSERY. APPROVAL OF PLANT MATERIALS AT ANY TIME SHALL NOT IMPAIR THE SUBSEQUENT RIGHT OF INSPECTION AND REJECTION DURING PROGRESS OFTHE WORK. 2. PLANTS INSPECTED ON SITE AND REJECTED FOR NOT MEETING SPECIFICATIONS MUST BE REMOVED IMMEDIATELY FROM SITE OR RED -TAGGED AND REMOVED AS SOON AS POSSIBLE. 3. THE RESTORATION CONSULTANT MAY ELECT TO INSPECT PLANT MATERIALS AT THE PLACE OF GROWTH. AFTER INSPECTION AND ACCEPTANCE, THE RESTORATION CONSULTANT MAY REQUIRE THE INSPECTED PLANTS BE LABELED AND RESERVED FOR PROJECT. SUBSTITUTION OF THESE PLANTS WITH OTHER INDIVIDUALS, EVEN OF THE SAME SPECIES AND SIZE, IS UNACCEPTABLE. MEASUREMENT OF PLANTS 1. PLANTS SHALL CONFORM TO SIZES SPECIFIED UNLESS SUBSTITUTIONS ARE MADE AS OUTLINED IN THIS CONTRACT. 2. HEIGHT AND SPREAD DIMENSIONS SPECIFIED REFER TO MAIN BODY OF PLANT AND NOT BRANCH OR ROOT TIP TO TIP. PLANT DIMENSIONS SHALL BE MEASURED WHEN THEIR BRANCHES OR ROOTS ARE IN THEIR NORMAL POSITION. 3. WHERE A RANGE OF SIZE IS GIVEN, NO PLANT SHALL BE LESS THAN THE MINIMUM SIZE AND AT LEAST 50% OF THE PLANTS SHALL BE AS LARGE AS THE MEDIAN OF THE SIZE RANGE. (EXAMPLE: IF THE SIZE RANGE IS 12" TO 18". AT LEAST 50 % OF PLANTS MUST BE 15" TALL.). SUBMITTALS PROPOSED PLANT SOURCES 1. WITHIN 45 DAYS AFTER AWARD OF THE CONTRACT, SUBMIT A COMPLETE LIST OF PLANT MATERIALS PROPOSED TO BE PROVIDED DEMONSTRATING CONFORMANCE WITH THE REQUIREMENTS SPECIFIED. INCLUDE THE NAMES AND ADDRESSES OF ALL GROWERS AND NURSERIES. PRODUCT CERTIFICATES 1. PLANT MATERIALS LIST- SUBMIT DOCUMENTATION TO RESTORATION CONSULTANT AT LEAST 30 DAYS PRIOR TO START OF WORK UNDER THIS SECTION THAT PLANT MATERIALS HAVE BEEN ORDERED. ARRANGE PROCEDURE FOR INSPECTION OF PLANT MATERIAL WITH RESTORATION CONSULTANT AT TIME OF SUBMISSION. 2. HAVE COPIES OF VENDOR'S OR GROWERS' INVOICES OR PACKING SLIPS FOR ALL PLANTS ON SITE DURING INSTALLATION. INVOICE OR PACKING SLIP SHOULD LIST SPECIES BY SCIENTIFIC NAME, QUANTITY, AND DATE DELIVERED (AND GENETIC ORIGIN IF THAT INFORMATION WAS PREVIOUSLY REQUESTED). DELIVERY, HANDLING, & STORAGE NOTIFICATION CONTRACTOR MUST NOTIFY CONSULTANT 48 HOURS OR MORE IN ADVANCE OF DELIVERIES SO THAT CONSULTANT MAY ARRANGE FOR INSPECTION. PLANT MATERIALS 1. TRANSPORTATION - DURING SHIPPING, PLANTS SHALL BE PACKED TO PROVIDE PROTECTION AGAINST CLIMATE EXTREMES, BREAKAGE AND DRYING. PROPER VENTILATION AND PREVENTION OF DAMAGE TO BARK, BRANCHES, AND ROOT SYSTEMS MUST BE ENSURED. 2. SCHEDULING AND STORAGE - PLANTS SHALL BE DELIVERED AS CLOSE TO PLANTING AS POSSIBLE. PLANTS IN STORAGE MUST BE PROTECTED AGAINST ANY CONDITION THAT IS DETRIMENTAL TO THEIR CONTINUED HEALTH AND VIGOR. 3. HANDLING- PLANT MATERIALS SHALL NOT BE HANDLED BY THE TRUNK, LIMBS, OR FOLIAGE BUT ONLY BY THE CONTAINER, BALL, BOX, OR OTHER PROTECTIVE STRUCTURE, EXCEPT BAREROOT PLANTS SHALL BE KEPT IN BUNDLES UNTIL PLANTING AND THEN HANDLED CAREFULLY BY THE TRUNK OR STEM. 4. LABELS - PLANTS SHALL HAVE DURABLE, LEGIBLE LABELS STATING CORRECT SCIENTIFIC NAME AND SIZE. TEN PERCENT OF CONTAINER GROWN PLANTS IN INDIVIDUAL POTS SHALL BE LABELED. PLANTS SUPPLIED IN FLATS, RACKS, BOXES, BAGS, OR BUNDLES SHALL HAVE ONE LABEL PER GROUP. WARRANTY PLANT WARRANTY PLANTS MUST BE GUARANTEED TO BE TRUE TO SCIENTIFIC NAME AND SPECIFIED SIZE, AND TO BE HEALTHY AND CAPABLE OF VIGOROUS GROWTH. REPLACEMENT 1. PLANTS NOT FOUND MEETING ALL OF THE REQUIRED CONDITIONS AT THE CONSULTANTS DISCRETION MUST BE REMOVED FROM SITE AND REPLACED IMMEDIATELY AT THE CONTRACTOR'S EXPENSE. 2. PLANTS NOT SURVIVING AFTER ONE YEAR TO BE REPLACED AT THE CONTRACTOR'S EXPENSE. PLANT MATERIAL GENERAL 1. PLANTS SHALL BE NURSERY GROWN IN ACCORDANCE WITH GOOD HORTICULTURAL PRACTICES UNDER CLIMATIC CONDITIONS SIMILAR TO OR MORE SEVERE THAN THOSE OF THE PROJECT SITE. 2. PLANTS SHALL BE TRUE TO SPECIES AND VARIETY OR SUBSPECIES. NO CULTIVARS OR NAMED VARIETIES SHALL BE USED UNLESS SPECIFIED AS SUCH. QUANTITIES SEE PLANT LIST ON ACCOMPANYING PLANS AND PLANT SCHEDULES. ROOTTREATMENT 1. CONTAINER GROWN PLANTS (INCLUDES PLUGS): PLANT ROOT BALLS MUST HOLD TOGETHER WHEN THE PLANT IS REMOVED FROM THE POT, EXCEPT THAT A SMALL AMOUNT OF LOOSE SOIL MAY BE ON THE TOP OF THE ROOTBALL. 2. PLANTS MUST NOT BE ROOT -BOUND; THERE MUST BE NO CIRCLING ROOTS PRESENT IN ANY PLANT INSPECTED. 3. ROOTBALLS THAT HAVE CRACKED OR BROKEN WHEN REMOVED FROM THE CONTAINER SHALL BE REJECTED. PLANT INSTALLATION DETAILS AND NOTES SCALE AS NOTED NOTES: 1. PLANTING PIT SHALL NOT BE LESS THAN (2) TIMES THE W IDTH OFTHE ROOT BALL DOL 2. LOOSEN SIDES AND BOTTOMS OF PLANnNG PR 3. SOAK PLANTING PIT AFTER PLANTING REMOVE FROM POT OR BURLAP & ROUGH -UP ROOT BALL BEFORE INSTALLING. UNTANGLE AND STRAIGHTEN CIRCLING ROOTS -PRUNE IF NECESSARY. IF PLANTIS EXCEPTIONALLY ROOT -BOUND, DO NOT PIANTAND RETURNTO NURSERY FOR AN ACCEPTABLE ALTERNATIVE SPECIFIED MULCH LAYER. HOLD BACK MULCH FROM TRUNKISTEMS FINISH GRADE REMOVE DEBRIS AND LARGE ROCKS FROM PLANTING PR AND SCARIFY SIDESAND BASE. BACKFI L WITH SPECIFIED SOIL. FIRM UP SOIL AROUND PLANT. 1 TREE AND SHRUB PLANTING Scale: NTS NOTES: 1. PLANT GROUNDCOVER AT SPECIFIED DISTANCE ON -CENTER (D.C.) USING TRIANGULAR SPACING, TYP. 2. LOOSEN SIDES AND BOTTOM OF PLANTING PIT AND REMOVE DEBRIS 3. LOOSEN ROOTBOUND PLANTS BEFORE INSTALLING 4, SOAK PIT BEFORE AND AFTER INSTALLING PLANT SPECIFIED MULCH LAYER. HOLD BACK MULCH FROM STEMS SOIL AMENDMENTS AS SPECIFIED GROUNDCOVER PLANTING Scale: NTS NOTES: 1. INSTALL HARDWOOD CUTTINGS DURING THEIR DORMANCY. DO NOT ALLOW THEM TO DRY OUT. 2. CUTTINGS SHALL BE J'TO 1" IN DIAMETER OR APPROVED EQUIVALENT. 3. INSTALL TO MIN. 213RDS DEPTH INTO SOIL. USE TRIANGULAR SPACING SEE PLANTING SCHEDULE FOR SPACING. 4. INSURE THAT BUDS ARE POINTING UP. 5. FIRM UP SOIL AROUND INSTALLED CUTTING. 6. WATER AFTER PLANTING AND BEFORE MULCHING. MINMUMTWO LIVE BUDS EXPOSED ABOVE GROUND. - TAMP SOLL AROUND CUTTING, ENSURE NO AIR POCKETS II m �zp SPECIFIED MULCH LAYER m zo p O FINISH GRADE 0 SOILAMENDMENTSAS Z 0 SPECIFIED y _ m i I O FORM PILOT HOLE WA ROCK BAR, REBAR OR OTHER a PLANTINGTOOL DONOT N I HAMMER OR POUND IN CUTTINGS UNLESS APPROVED BY RESTORATION SPECIALIST. ANGLE CUT AT BASE 3 LIVE STAKE PLANTING Scale: NTS DRAFT NOT FOR CONSTRUCTION O Cop)r4hb The Webre Co" THE WATERSHED COMPANY 750 Sixth Street South Kirkland WA 98033 p 425.822.5242 www.watershedco.com Science & Design F'T-I U W wo 0 r PLI 0 C�WOcn 0�-ui ~�WJQ W T J ZN QM Ga w 1.4 g O U ?� SHEET SIZE: ORIGINAL PLAN IS 22" x 34 SCALE ACCORDINGLY. L7) N M O O DO O Q NQ L.L LU 0 LLI ILL 0) N X O m 4 PROJECTMANAGER: HM DESIGNED: GJ DRAFTED: LV CHECKED: GJ, AR JOB NUMBER: 140809 SHEET NUMBER: W7 OF 8 Executive Summary This plan serves as a restoration plan for proposed temporary Impacts to Cold Creek, wetland, steep slope, and buffer areas associated with stabilization of a sewer trunk line that crosses Cold Creek in the City of Federal Way. Goals and Objectives Goal: Restore habitat functions that may have been Interrupted due to temporary impacts to wetland, stream, and sleep slope critical areas and their buffers. Objectives: 1. Restore soils removed or compacted along equipment access and staging area at north end of construction area. 2. Establish dense and diverse native tree, shrub, and groundcover vegetation where damaged during construction. 3. Remove and control invasive weeds from restoration areas. Performance Standards The performance standards (PS) listed below will be used to judge the success of the plan over time. ff the standards are met at the end of the five-year monitodng period, the restoration site will be considered successful and the project will have met all critical area permitting obligations. PS 1. Soils: a. Temporadly-placed sand, gravel, hog fuel, and/or other fill materials will be absent from equipment access and staging area at north end of construction area. b. Solis will be decompacted pdor to planting. c. Soils will be amended with compost prior to planting. PS 2. Survival/diversity: a. 100% survival of all wood plantings al the end of year one. This standard may be met YP g Y Y through establishment of installed plants or by replanting as necessary to achieve the required numbers. b. 80% survival of all woody plantings at the end of year two. This standard may be met through establishment of installed plants or by replanting as necessary to achieve the required numbers. Survival beyond year two is difficultto track. Therefore, a diversity standard is proposed in place of survival (below). Areas planted entirely with live cuttings, or dense groundcover/emergent plantings, shall not be held to the 80% survival standard. Any such areas that exhibit widespread mortality shall be re-evaluated by the restoration specialist to ascertain the site -specific viability of the cuttings. PS 3. Native woody vegetation cover: a. Achieve at least 60% cover of native woody species by the end of Year 3. Volunteer species may count towards this standard. b. Achieve at least 80% cover of native woody species by the end of Year 5. Volunteer species may count towards this standard. PS 4. Diversity: a. Establish at least 1 native tree species, 5 native shrub species, and 2 native groundcover by the end of Year 5. PS 5. Invasive species standards: a. No more than 10% cover of invasive species in any of the planting areas, in any monitoring year. More than 5% cover of invasive weeds in any year will trigger maintenance weeding. As -built Plan An as -built plan will be prepared within 30 days of substantially complete construction of the restoration area. The as -built plan will document substantial conformance with these plans and also will disclose any substitutions or other noncritical departures. The as-buih plan will establish baseline plant installation quantities (based on sample counts or invoices), and photo points that will be used throughout the monitoring period to measure the performance standards overtime. The as -built documentation should include a markup of the original plan noting any departures, plus the location of photo points. MITIGATION PLAN NOTES SCALE AS NOTED Monitoring Methods This monitoring program is designed to track the success of the restoration site overtime by measuring the degree to which the performance standards listed above are being met. Monitoring shall occur twice annually forfive years. A spring monitoring visit shall record necessary replanting, weeding, invasive control, and other maintenance needs. The constructed in -stream habitat features Including the log structures will also be inspected in the spring once each year forfive years following construction to Identify any maintenance or repairs that would need to be done during the upcoming low -flow season. Stream channel, stream bank, and log structure functioning would be assessed. Examples of stream channel maintenance or repair might include stabilizing any eroding streembanks or securing any logs that may threaten to be washed downstream. The Restoration Specialist will notify the owner and/or maintenance crews of necessary early season maintenance. The second visit shall occur in late summer or fall and contain the bulk of the monitoring work. The annual monitoring report will relate the following information: 1. General summary of the spring visit. 2. First- and second -year counts of surviving and dead/dying woody plants. 3. Estimates of native woody species cover in restoration areas using the cover dass method. 4. Estimates of invasive spades cover in restoration areas using the cover class method. 5. Counts of established native species to determine site diversity. 6. Notes and/or sketches of invasive weeds or bare areas. 7. Photographic documentation from established reference points. 8. Intrusions into the planting areas, vandalism, trash, and other actions detrimental to the overall health of the restoration area. 9. Recommendations for maintenance in the restoration area. Construction Notes and Specifications Note: Specifications for items in bold can be found under "Material Specifications and Definitions." Note: The Watershed Company personnel [(425) 822-5242], or other persons qualified to evaluate e nvirvnmentel restoration pruimis, shall monitor: 1. All site preparation. a. Invasive weed management and soil preparation. 2. Plant material inspection. a. Plant material delivery inspection. b. Plant installation inspection. General Work Sequence 1. Following completion of construction, remove any temporarily -placed fill materials and associated underlying fabric from equipment access and staging area. 2. Remove all invasive weeds and weed roots from entire planting area as directed by the Restoration Specialist Avoid damage to existing native vegetation. 3. Soil preparation and planting sequence shall vary by planting area type. Refer to W6 Restoration Planting Plan for detailed soil preparation and planting instructions by planting area type. 4. Install vegetation per the planting plans and planting details. 5. All plant installation shall take place during the dormant season (October 15 through March 1), during frost free periods, for best survival, 6. Install blanket application of wood chip mulch in restoration areas to depth of 4 inches. To prevent rot, pull mulch back from stems of installed plants. Note: to the extent that wood chip mulch meeting specifications has been substituted for hog fuel to provide construction access, and as long as it remains free from contamination and debris, it may be re -used as mulch. Maintenance This site will be maintained for five years following completion of the construction. Specifications in bold can be found under "Material Specifications and Definitions." 1. Replace each plant found dead in the summer monitoring visits during frost -free periods only In the upcoming fall dormant season (October 15 to March 1) for the first two monitoring years. Replace plants as directed In subsequent monitoring reports. 2. Follow the recommendations noted in the spring monitoring site visit. 3. General weeding for all planted areas: a. At least twice yearly, remove all competing grass and weeds, including roots, from beneath each installed plant and any desirable volunteer vegetation to a distance of 18 inches from the main plant stem. Weeding should occur at least twice during the spring and summer. Frequent weeding will result in lower mortality and lower plant replacement costs. b. More frequent weeding may be necessary depending on weed conditions that develop after plan installation. c. Do not weed the area near the plant bases with string trimmer (weed whacker/weed eater). Native plants are easily damaged or killed, and weeds easily recover after trimming. 4. Apply slow release granular fertilizer to each installed plant annually in the spring (by June 1) of Years 2 through 5. 5. Mulch the weeded areas beneath each plant with wood chips as necessary to maintain a 44nch-thick mulch layer and keep down weeds. Contingency plans and adaptive management These plans have been prepared to ensure success to the maximum practicable extent Quality and consistency of installation, maintenance, weather pattern extremes, wildlife damage, vandalism and other factors can singly or in combination change conditions at mitigation sites and 9Y 9 affect eventual success of these plans. Therefore, adaptive management should be employed to evaluate problems as they arise and develop flexible and practical solutions. Examples can include but are not limited to plant substitution, changes in target vegetation classes, soil amendment, and re -grading. As a last resort, modification of performance standards can be necessary. Any actions involving major departures from the original plan or goals and performance standards should be discussed and agreed to with regulatory agencies ahead of implementation. Material Specifications and Definitions 1. Compost Compost shall meet WSDOT Standard Specifications for Road, Bridge, and Municipal Construction, 9-14.4(8) for Fine Compost. Amendment quantity required for construction: 7.5 cubic yards. 2. Fertilizer: Slow release, granular fertilizer such as Osmocote, or equal product Most retail nurseries carry this product. Follow manufacturer's instructions for application. Keep fertilizer in a weather -tight container while on site. Note that fertilizer is to be applied only in years two, three, four and five and not in the first year. Fertilizer shall not be placed in inundated areas. 3. Restoration Specialist: The Watershed Company personnel [(425) 822-5242] orother persons qualified to evaluate environmental restoration projects. 4. Wood chip mulch: Wood chip mulch shall meet WSDOT Standard Specifications for Road, Bridge, and Municipal Construction for Bark or Wood Chips as defined by 9-14.4(3). "Bark or wood chip mulch shall be derived from Douglas -fir, pine, or hemlock spades. it shall not contain resin, tannin, orother compounds in quantities that would be detrimental to plant life. Sawdust shall not be used as mulch.' Quantity required: 145 cubic yards. Bark or wood chips when tested shall be according to WSDOT Test Method T 123 prior to placement and shall meet the following loose volume gradation: Sieve Size Percent Passing Minimum Maximum 2" 95 100 No.4 0 30 DRAFT NOT FOR CONSTRUCTION Oca"'thF THE WATERSHED COMPANY 750 Sixth Street South Kirkland WA 98033 p 425.822.5242 www.watershedco.com Science & Design �U WO L) a - U) H❑0}co Kai C! J F- 7 � Lu oWC40 -1 r Z >cs � Q W LU 2 U CL O U� rn Z O ca J r 2 m to SHEET SIZE: ORIGINAL PLAN IS 22' x 34'- SCALE ACCORDINGLY. O 04 C M (0 O 00 fA y� 7 J Q LU a €LJ IL (7) ('V x in 4 PROJECT MANAGER: HM DESIGNED: GJ DRAFTED: I-V CHECKED: GJ, AR JOB NUMBER: 140809 SHEET NUMBER: W8 OF 8 The Watershed Company March 2016 APPENDIX B Wetland and Stream Delineation � Report (The Watershed Company, 2016) J 2 THE WATERSHED COMPANY March 15, 2016 Rick Powell, PE Robinson Noble 17625 13011, Ave NE #102 Woodinville, WA 98072 SCIENCE 3 DESIGN Re: Lakehaven Utility District, Redondo WWTP Wetland Delineation Report The Watershed Company Reference Number: 140809 Dear Rick: On September 1, 2015, Biologist Clover Muters and I visited the Lakehaven Utility District (LUD) Redondo Wastewater Treatment Plant (WWTP) in Des Moines, Washington and adjacent areas in Federal Way, Washington. The purpose of the visit was to conduct a wetland delineation study on the property and on adjacent 1 undeveloped properties located in Federal Way, Washington. The study area focused on areas in the vicinity of an existing dirt access road that originates near the southeast corner of the WWTP westward to Cold Creek. The LUD is proposing to repair a sewer trunk line pipe, which has become exposed within the banks of Cold Creek. This repair will require crossing at least a portion of a jurisdictional wetland to bring machinery from the existing dirt road to the exposed pipe location. An October 2014 site visit by Clover Muters and Fisheries Biologist Greg Johnston located and flagged the Ordinary High Water Mark (OHWM) of Cold Creek in the vicinity of the exposed pipe. This letter summarizes the findings of this study and details applicable federal, state, and local regulations. The following attachments are included: • Wetland and Stream Delineation Map • Wetland Determination Data Forms • Wetland Rating Forms IMethods Public -domain information on the subject properties was reviewed for this delineation Jstudy. These sources include USDA Natural Resources Conservation Service Soil maps, U.S. Fish and Wildlife Service National Wetland Inventory maps, Washington Department of Fish and Wildlife interactive mapping programs (PHS on the Web), and 750 Sixth Street South I Kirkland, WA 98033 p 425.822.5242 1 f 425.827.8136 1 watershedco.com Wetland Delineation Report Rick Powell March 15, 2016 Page 2 King County's GIS mapping website (iMAP). The study area was evaluated for wetlands using methodology from the Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Western Mountains, Valleys, and Coast Region Version 2.0 (Regional Supplement) (US Army Corps of Engineers [Corps] May 2010). The wetland boundaries were determined on the basis of an examination of vegetation, soils, and hydrology. Areas meeting the criteria set forth in the Regional Supplement were determined to be wetland. Soil, vegetation, and hydrologic parameters were sampled at several locations along the wetland boundaries to make the determination. Data points on -site are marked with yellow- and black - striped flags. We recorded data at four of these locations. Delineated wetlands were classified using the Western Washington Wetland Rating System 2014 Update (Ecology, January 2015) (Rating System). Wetlands A and B were marked with 28 and 5 pink- and black -striped flags, respectively. Only those wetland boundaries that encumber the proposed maintenance project were delineated as part of this study. A survey of the field delineation was completed in October and November of 2015. The OHWM of Cold Creek was determined based on the definition provided by the Washington Department of Fish and Wildlife and WAC 220-110-020(69). The OHWM is located by examining the bed and bank physical characteristics and vegetation to ascertain the water elevation for mean annual floods. Areas meeting the definition were determined to be the OHWM and flagged. Field observations were used to classify the stream according to the City of Federal Way, where the pipe crossing is located. Findings The study area is located mostly in Federal Way; Section 5, Township 21 North, Range 4 East; Central Puget Sound Drainage Basin; Water Resource Inventory Area 9 (WRIA 9) (Duwamish-Green). The study area is situated on one side of a steep ravine hillside that slopes downhill from east to west at an average gradient between 30 and 40 percent, based on a previous survey. In the ravine bottom, Cold Creek flows northward to its entrance in a culvert beneath the WWTP property. Non -wetland areas are forested with a mix of bigleaf maple and red alder trees in the canopy, with salmonberry, osoberry, sword fern, bracken fern, and dewberry prevalent in the understory. There are two wetlands (Wetlands A and B) located in the study area. Wetland A Wetland A is a slope wetland occupying much of the study area and extending downslope to the banks of Cold Creek. The wetland area originates upslope of the dirt road and crosses the road approximately 120 feet south of the Des Moines/Federal Way Wetland Delineation Report Rick Powell March 15, 2016 Page 3 municipal boundary. Much of the wetland boundary in the study area is located west of (downslope) and generally parallel to the dirt access road. Forested and scrub -shrub Cowardin vegetation communities comprise Wetland A. Prominent vegetation includes red alder, salmonberry, red -osier dogwood, stink currant, skunk cabbage, lady fern, and piggy -back plant. The soil in Wetland A is a variable but typically satisfies the criteria 1 for the hydric soil indicators Redox Dark Surface (F6) and/or Depleted Matrix (F3). J Hydrology for Wetland A is provided by a high groundwater table that can be observed as groundwater seeps and poorly defined surface water conveyances throughout the wetland area. The water table was approximately one inch below the soil surface throughout much of the wetland area at the time of the inspection. ~� Wetland B Wetland B includes the encumbering portion of a slope wetland that extends northeast beyond the study area. The delineated portion of Wetland B is located just northeast of the dirt access road at the base of a large wooden retaining wall near the municipal boundary. Groundwater continuously seeps through the interstitial spaces between the wooden boards comprising the retaining wall. The delineated area is sparsely vegetated and includes a portion of an open pipe drainage feature that appears to convey stormwater through the wetland as well as capturing surface runoff from the wetland itself. The wetland continues off -site above the retaining wall. The retaining wall serves as a vertical break between the delineated portion of Wetland B and the relatively undisturbed portion above the wall. The slope wetland was likely continuous historically, but historic grading activities for the access road and construction of the wall substantially altered its condition. Since the delineated portion appears to have been excavated/graded from existing wetland, the area is regulated as a jurisdictional wetland. I' Wetland B includes a forested Cowardin vegetation community composed of red alder, k salmonberry, small -fruited bulrush, lady fern, and giant horsetail. The soil in Wetland B is a very dark brown (10YR 3/2) sandy loam with redoximorphic features preset. The upper eight inches of the soil satisfies the criteria for the hydric soil indicator Redox Dark Surface (136). Below eight inches, the soil is composed of a compact gravel and cobble mix, which is likely fill material imported during construction of the dirt road. Hydrology for Wetland B is provided by a high groundwater table that can be visually observed in the form of groundwater seeps, particularly above the retaining wall. The J soil was saturated at the surface, and groundwater was observed one inch below the surface at the time of the inspection. Cold Creek Cold Creek is a permanently -flowing stream that flows through the study area in a generally northwest direction at a gradient of approximately six percent. The width of Wetland Delineation Report Rick Powell March 15, 2016 Page 4 Cold Creek in the project area is typically 15-20 feet. Coho salmon are documented in Cold Creek downstream of the WWTP, and their presence is presumed in the project area (SalmonScape). Resident cutthroat trout are mapped in the project area (PHS Data). Local Regulations The delineated wetlands are both located entirely within Federal Way. Wetlands in Federal Way are regulated under Chapter 19.145 of the Federal Way Municipal Code (FWMC) - Environmentally Critical Areas. Under the Code, wetlands are classified as one of four categories based on the 2014 Rating System. According to the Rating System, Wetland A scored five points for water quality functions, five points for hydrologic functions, and six points for habitat functions for a total of 16 points. Wetland B scored a total of five points for water quality functions, six points for hydrologic functions, and five points for habitat functions, for a total of 16 points. The cumulative scores qualify both wetlands as Category III. The location of the pipe crossing over Cold Creek is located in Federal Way. As a documented fish -bearing stream, Cold Creek is classified as a Type F stream [FWMC 19.145.270(1)]. State and Federal Regulations Wetlands are also regulated by the Corps under section 404 of the Clean Water Act. Any filling of Waters of the U.S., including wetlands (except isolated wetlands), would require notification and permits from the Corps. Wetlands A and B would likely not be considered isolated due connections to Cold Creek. Federally permitted actions that could affect endangered species (i.e. salmon or bull trout) may also require a biological assessment study and consultation with the U.S. Fish and Wildlife Service and/or the National Marine Fisheries Service. Application for Corps permits may also require an individual 401 Water Quality Certification and Coastal Zone Management Consistency determination from Ecology and a Cultural Resource Study in accordance with Section 106 of the National Historic Preservation Act. In general, neither the Corps nor Ecology regulates wetland buffers, unless direct impacts are proposed. When direct impacts are proposed, mitigated wetlands may be required to employ buffers based on Corps and Ecology joint regulatory guidance. Disclaimer The information contained in this letter or report is based on the application of technical guidelines currently accepted as the best available science and in conjunction with the manuals and criteria outlined in the methods section. All discussions, conclusions and recommendations reflect the best professional judgment of the author(s) and are based upon information available to us at the time the study was conducted. All work was Wetland Delineation Report Rick Powell March 15, 2016 Page 5 1 completed within the constraints of budget, scope, and timing. The findings of this report are subject to verification and agreement by the appropriate local, State and 1 Federal regulatory authorities. No other warranty, expressed or implied, is made. Please call if you have any questions or if we can provide you with any additional information. Sincerely, Ryan Kahlo, PWS j Ecologist Enclosures 2 THE WATERSHED COMPANY Em tiu, I J GRAVEL PAN s ; 3 VICINI��MAPS I / , I A WETLAND A -,yW -*l� w W w �--t^ - W W W 41 �-� ��PRTiE _ �-`� � �_—..._ � _ f .YW.. - SI W x � +l. \ "L•` �_•`���,� _ � i"t'�?� � �' ' ' `_ -_� � � �� - • `�,I - yL- �� - -ty "- �^ - - y� , -7y. �k-� - fir- � � .!. _`mob- 1 `V[ ss ~ SSA -- - � - - -%'� = - `� Y - : +.- `�•b-.� 1v -'� - -•v _ W'P f s _ p' 4 6' cwv+Lwx I'EN W y .71'�.� C -+V W- �• y '� �Y r v �_V� -__ _ �Y ,rlr.W r--W�{. -7 w�� �Y'� W'�-,�Y` _^l�rlµ�• S• yF �- .��.-:�••- .1f- -► _ w W w -mow - W --ctr • ,, iW --.at tirc��w `zt.___w�_ �Y sYr..._ �..—.._ . - ❑ � w _wY � �fri�-��k -jY�� `�'�_`1�--°�'.` �^� Z-�� -�: �tl' � ^ ak `��,i�a[e, 6� ,�/�.,,�-� �-.• - �_ �y - - -y. fit . +tom � ` y �G ` + f _ •J-Y��� �' �' `�:�"'"� l" ire %/ f •i .. �1 • --�� 0 f ►yam 1 .t- �- 1_.•' •. rc CONCRETE HEAD WA 'f ~.-,; •,'..:1=�•-�'r •�Q I.��:.. �W +� •�i' V' `L�_ .L�.•''--]]��.'F dV �� J r'��� —� _,�-'Sr ����[1•{ `� r•-' ,� f-rr� �� - - :.ti l �fJA/ rr yyr--rr f�SS� S rRQrecr�L - �• f'r�---- -J iti��_•��r �� r/ ff.' COLD CREEK NOTES a 1. CRITICAL AREAS DELINEATED BY THE WATERSHED COMPANY ON SEPTEMBER 1, 2015 y 2. SURVEY RECEIVED FROM TETRA TECH. OJECT 3. WETLAND B NOT DEPICTED AS IT IS LOCATED ENTIRELY OUTSIDE THE PROJECT AREA ORATION SULTANT THE WATERSHED C MPANYN 750 SIXTH STREET SOUTH, KIRKLAND, WA 98033. (425) 822-5242 WETLAND AND STREAM DELINEATION MAP LEGEND —DELINEATED COLD CREEK OHWM j, - _w DELINEATED WETLAND — — -WETLAND BUFFER DRAT NOT FOR CONSTRUCTION 750 Sixth Street South Kirkland WA 98033 p 425.822.5242 www.watershedco.com Science & Design V � Wo M CO a U) 00 Q >- '"I CO O J a ' �: W VUZZND Q j WwJ>MLL W rn P.-A _ W Y It X m Q J O d r U) z 0 U) W Er K CO CO SHEET SIZE: ORIGINAL PLAN IS 22" x 34". SCALE ACCORDINGLY. PROJECT MANAGER: HM DESIGNED: GJ DRAFTED: LV CHECKED: GJ, AR JOB NUMBER: 140809 SHEET NUMBER: 0 10' 20' 40' ®C."dghl-The Watershed W1 OF 1 THE WETLAND DETERMINATION DATA FORM 750 Sixth Street South WATERSHED COMPANY Western Mountains, Valleys, and Coast Supplement to the 1987 COE Wetlands Delineation Manual FE] Kirkland, Washington 98033 (425) 822-5242 watershedco.com Project Site: Redondo WWTP Sampling Date: 9/1/2015 Applicant/Owner: Lakehaven Utility District Sampling Point: DP- 1 Investigator: Kahlo, Muters, C City/County: Des Moines I King Co. Sect., Township, Range: S 5 T 21N R 4E State: WA Landform (hillslope, terrace, etc): Hllislope Slope (%): 40 Local relief (concave, convex, none): None Subregion (LRR): A Let: Long: Datum: Soil Map Unit Name: Alderwood and Kitsap Soils, Very Steep NWI classification: None Are climatic/hydrologic conditions on the site typical for this time of year? ® Yes ❑ No (If no, explain in remarks.) Are "Normal Circumstances" present on the site? ® Yes ❑ No Are Vegetation❑, Soil ❑, or Hydrology ❑ significantly disturbed? (If needed, explain any answers in Remarks.) Are Vegetation❑, Soil ❑, or Hydrology ❑ naturally problematic SUMMARY OF FINDINGS —Attach site map showing samp ling point locations, tran sects, important features, etc. Hydrophytic Vegetation Present? Yes ® No ❑ Hydric Soils Present? Yes ® No ElIs the Sampling Point within a Wetland? Yes No Wetland Hydrology Present? Yes ® No ❑ Remarks: Click here to enter text. %1C/-C'rAT1f%k1 — 1 Icn eninn4 r nnmec nlnntc Tree Stratum (Plot size: 5m diam.) Absolute % CoverSpecies? Dominant Indicator Status Dominance Test Worksheet 1. Acer macrophyllu►n 100 No* FACU Number of Dominant Species 4 that are OBL, FACW, or FAC: (A) 2 3 Total Number of Dominant 4 Species Across All Strata: (B) 4 Sapling/Shrub Stratum (Plot size: 3m diam.) = Total Cover Percent of Dominant Species that are OBL, FACW, or FAC: 100 (A/B) 1. Rubus spectabilis 15 Yes FAC Prevalence Index Worksheet Total % Cover of Multioly by OBL species x 1 = 2 3 ' 4. FACW species x 2 = 6 FAC species x 3 = Herb Stratum (Plot size: 1m diam.) =Total Cover FACU species x 4 = UPL species x 5 = Column totals (A) (B 1 Atherium Mix-femina 45 Yes FAC Prevalence Index = B / A = 2. E uisetum telmateia 50 Yes FACW 3. To/meia menziesti 80 Yes FAC 4. Hydrophytic Vegetation Indicators 6 ® Dominance test is > 50% ❑ Prevalence test is 5 3.0 * Morphological Adaptations * (provide supporting ❑ data in remarks or on a separate sheet) ❑ Wetland Non -Vascular Plants * ❑ Problematic Hydrophytic Vegetation' (explain) 8 7 8 9 10 11. ' Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic Woody Vine Stratum Plot size: ] = Total corer Hydrophytic Vegetation Yes No Present? 1. 2. = Total Cover %Hare Ground in Herb Stratum: Remarks: *Rooted outside of wetland US Army Corps of Engineers Western Mountains, Valleys, and Coast — Interim Version SOIL Sampling Point—DP-1 Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.) Depth Matrix Redox Features Color moist % Color (moist) % Type' Locz (inchesl Texture Remarks 0-14 10YR 311 85 5GY 411 15 D M Sandy clay loam 'Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains 'Lac: PL=Pore Lining, M=Matrix Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.) Indicators for Problematic Hydric Soils3 ❑ Histosol (Al) ❑ Sandy Redox (S5) ❑ 2cm Muck (Al0) ❑ Histic Epipedon (A2) ❑ Stripped Matrix (S6) ❑ Red Parent Material (TF2) ❑ Black Histic (A3) ❑ Loamy Mucky Mineral (F1) (except MLRA 1) ❑ Other (explain in remarks) ❑ Hydrogen Sulfide (A4) ❑ Loamy Gleyed Matrix (F2) ❑ ❑ Depleted Below Dark Surface (Al 1) ❑ Depleted Matrix (F3) ❑ Thick Dark Surface (Al2) ® Redox Dark Surface (F6) 3 Indicators of hydrophytic vegetation and wetland hydrology must ❑ Sandy Mucky Mineral (S1) ❑ Depleted Dark Surface (F7) be present, unless disturbed or problematic ❑ Sandy Gleyed Matrix (S4) ❑ Redox Depressions (F8) Restrictive Layer (if present): Type: Hydric soil present? Yes No ❑ Depth (inches): Remarks: HYDROLOGY Wetland Hydrology Indicators: Primary Indicators (minimum of one required: check all that apply): Secondary Indicators (2 or more required): ❑ Surface water (Al) ❑ Sparsely Vegetated Concave Surface (B8) ❑ Water -Stained Leaves (139) (MLRA 1, 2, 4A & 4B) ® High Water Table (A2) ❑ Water -Stained Leaves (except MLRA 1, 2, 4A & 413) (B9) ❑ Drainage Patterns (B10) ® Saturation (A3) ❑ Salt Crust (B11) ❑ Dry -Season Water Table (C2) ❑ Water Marks (B1) ❑ Aquatic Invertebrates (B13) ❑ Saturation Visible on Aerial Imagery (C9) ❑ Sediment Deposits (B2) ❑ Hydrogen Sulfide Odor (Cl) ❑ Geomorphic Position (D2) ❑ Drift Deposits (B3) ❑ Oxidized Rhizospheres along Living Roots (C3) ❑ Shallow Aquitard (D3) ❑ Algal Mat or Crust (B4) ❑ Presence of Reduced Iron (C4) ❑ FAC-Neutral Test (D5) ❑ Iron Deposits (B5) ❑ Recent Iron Reduction in Tilled Soils (C6) ❑ Raised Ant Mounds (D6) (LRR A) ❑ Surface Soil Cracks (36) ❑ Stunted or Stressed Plants (D1) (LRR A) ❑ Frost -Heave Hummocks ❑ Inundation Visible on Aerial Imagery ❑ Other (explain in remarks) (B7) Field Observations Surface Water Present? Yes ❑ No ® Depth (in): Water Table Present? Yes M No ❑ Depth (in): Wetland Hydrology Present? Yes o No ❑ Saturation Present? Yes ® No ❑ Depth (in): (includes capillary fringe) Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available: Remarks: US Army Corps of Engineers Western Mountains, Valleys, and Coast— Interim Version f� 2 THE WATERSHED COMPANY WETLAND DETERMINATION DATA FORM 750 Sixth Street South Western Mountains, Valleys, and Coast Supplement to the Kirkland, Washington 98033 1987 COE Wetlands Delineation Manual aD (425) 822-5242 watershedco.com Project Site: Redondo WWTP Sampling Date: 9/1/2015 Applicant/Owner: Lakehaven Utility District Sampling Point: DP- 2 Investigator: Kahlo, Muters, C City/County: Des Moines I King Co. Sect.. Township, Range: S 5 T 21 N R 4E State: WA Landfonn (hillslope, terrace, etc): HIIISIope Slope (%): 50 Local relief (concave, convex, none): None Subregion (LRR): A Lat: Long: Datum: Soil Map Unit Name: Alderwood and Kitsap Soils, Very Steep NVVI classification: None Are climatic/hydrologic conditions on the site typical for this time of year? ® Yes ❑ No (If no, explain in remarks.) Are "Normal Circumstances" present on the site? ® Yes ❑ No Are Vegetation❑, Soil ❑, or Hydrology ❑ significantly disturbed? Are Vegetation❑, Soil ❑, or Hydrology ❑ naturally prohlernatic (If needed, explain any answers in Remarks.) SUMMARY OF FINDINGS —Attach site Hydrophytic Vegetation Present? i Hydric Soils Present? i Wetland Hydrology Present? Remarks: Click here to enter text. J s howi ng sam ling point locations, transacts, important features, etc. Yes ® No ❑ Yes ❑ No ® Is the Sampling Point within a Wetland? Yes Yes ❑ No �/C!_`CTATIALI _ I Icn cninn4ifir n:amnc of nianTc No 0 Tree Stratum (Plot size: 5m diam.) Absolute % cu'J per Dominant S ECEii5? Indicator Status Dominance Test Worksheet 1. Acer macrophyllum 100 Yes FACU Number of Dominant Species 3 that are OBL, FACW, or FAC: (A) 2. Alnus rubra 60 Yes FAC 3 Total Number of Dominant 5 Species Across All Strata: (B) q Sapling/Shrub Stratum (Plot size: 3m diam.) = Total Cover Percent of Dominant Species that are OBL, FACW, or FAC: 60 (A/B) 1. Rubus spectabilis 90 Yes FAC Prevalence Index Worksheet Total °/° Caver of Mulfioly by OBL species x 1 = 2 3 q FACW species x 2 = 5 FAC species x 3 = Herb Stratum (Plot size: I diam.) =Total Cover FACU species x 4 = x 5 = UPL species Column totals (A) B) 1. Pol stichum munitum 80 Yes FACU Prevalence Index = B / A = 2. Ather/um irlix-femina 20 Yes FAC 3. q_ Hydrophytic Vegetation Indicators 5 ® Dominance test is > 50% ❑ Prevalence test is 5 3.0' Morphological Adaptations' (provide supporting ❑ data in remarks or on a separate sheet) ❑ Wetland Non -Vascular Plants' ❑ Problematic Hydrophytic Vegetation " (explain) 6 7. 6 9 10 11. ' Indicators of hydric soil and wetland hydrology must be present. unless disturbed or problematic Woody Vine Stratum Plot size: = Tofa� CD'Ve, Hydrophytic Vegetation Present? Yes No 1-1 2 =Total Cover % Bare Ground in Herb Stratum: Remarks: US Army Corps of Engineers Western Mountains, Valleys, and Coast — Interim Version SOIL Sampling Point — DP-2 Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.) Depth Matrix Redox Features (inches) Texture Remarks Color (moist) % Color (moist) % T e' Loe Oa 10YR 312 100 Sandy loam 5-12 2.5Y 3/2 100 Sandy loam 'Type: C=Concentration, D=Depletion, RM=Reduced Matrix, CS=Covered or Coated Sand Grains ZLoc: PL=Pore Lining, M=Matrix Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.) Indicators for Problematic Hydric Soils3 ❑ Histosol (Al) ❑ Sandy Redox (S5) ❑ 2cm Muck (Al0) ❑ Histic Epipedon (A2) ❑ Stripped Matrix (S6) ❑ Red Parent Material (TF2) ❑ Black Histic (A3) ❑ Loamy Mucky Mineral (F1) (except MLRA 1) ❑ Other (explain in remarks) ❑ Hydrogen Sulfide (A4) ❑ Loamy Gleyed Matrix (F2) ❑ ❑ Depleted Below Dark Surface (Al 1) ❑ Depleted Matrix (173) ❑ Thick Dark Surface (Al2) ❑ Redox Dark Surface (F6) 3 Indicators of hydrophytic vegetation and wetland hydrology must ❑ Sandy Mucky Mineral (S1) ❑ Depleted Dark Surface (F7) be present, unless disturbed or problematic ❑ Sandy Gleyed Matrix (S4) ❑ Redox Depressions (F8) Restrictive Layer (if present): Type: Hydric soil present? Yes ❑ No Lh! Depth (inches): Remarks: HYDROLOGY Wetland Hydrology Indicators: Primary Indicators (minimum of one required., check all that apply): Secondary Indicators (2 or more req+jlred): ❑ Surface water (Al) ❑ Sparsely Vegetated Concave Surface (B8) ❑ Water -Stained Leaves (139) (MLRA 1, 2, 4A & 4B) ❑ High Water Table (A2) ❑ Water -Stained Leaves (except MLRA 1, 2, 4A & 4B) (159) ❑ Drainage Patterns (B10) ❑ Saturation (A3) ❑ Salt Crust (1311) ❑ Dry -Season Water Table (C2) ❑ Water Marks (131) ❑ Aquatic Invertebrates (B13) ❑ Saturation Visible on Aerial Imagery (C9) ❑ Sediment Deposits (132) ❑ Hydrogen Sulfide Odor (C1) ❑ Geomorphic Position (132) ❑ Drift Deposits (133) ❑ Oxidized Rhizospheres along Living Roots (C3) ❑ Shallow Aquitard (D3) ❑ Algal Mat or Crust (134) ❑ Presence of Reduced Iron (C4) ❑ FAC-Neutral Test (135) ❑ Iron Deposits (B5) ❑ Recent Iron Reduction in Tilled Soils (C6) ❑ Raised Ant Mounds (D6) (LRR A) ❑ Surface Soil Cracks (136) ❑ Stunted or Stressed Plants (Di) (LRR A) ❑ Frost -Heave Hummocks ❑ Inundation Visible on Aerial Imagery ❑ Other (explain in remarks) (B7) Field Observations Surface Water Present? Yes ❑ No ® Depth (in): Water Table Present? Yes ❑ No ® Depth (in): Wetland Hydrology Present? Yes ❑ No IM Saturation Present? Yes ❑ No ® Depth (in): (includes capillary fringe) Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available: Remarks: US Array Corps of Engineers Western Mountains, Valleys, and Coast— Interim Version 2 THE WATERSHED COMPANY WETLAND DETERMINATION DATA FORM 750 Sixth Street South Western Mountains, Valleys, and Coast Supplement to the Kirkland, Washington 98033 1987 COE Wetlands Delineation Manual E�il (425) 822-5242 watershedco.com Project Site: Redondo WWTP Sampling Date: 9/1/2015 ApplicanVOwner: Lakehaven Utility District Sampling Point: DP- 3 Investigator: Kahlo, Muters, C City/County: Des Moines 1 King Co. Sect., Township, Range: S 5 T 21N R 4E State: WA Landform (hillslope, terrace, etc): Hlllslope Slope (%): 15 Local relief (concave, convex, none): None Subregion (LRR): A Lat: Long: Datum: Soil Map Unit Name: Alderwood and Kitsap Soils, Very Steep NWI classification: None Are climatic/hydrologic conditions on the site typical for this time of year? ® Yes ❑ No (If no, explain in remarks.) Are "Normal Circumstances" present on the site? ® Yes ❑ No Are Vegetation❑, Soil ❑, or Hydrology ❑ significantly disturbed? (If needed, explain any answers in Remarks.) Are Vegetation❑, Soil El, or Hydrology ❑ naturally problematic SUMMARY OF FINDINGS —Attach site map showing sa mgiing Eoint locations, iransecis, rna ponant iedture5, MG. Hydrophytic Vegetation Present? Yes ® No ❑ Hydric Soils Present? Yes ® No ElIs the Sampling Point within a Wetland? Yes No Wetland Hydrology Present? Yes ® No ❑ Remarks: Click here to enter text. VEGETATION — Use scientific names of plants Tree Stratum (Plot size: 5m diam.) Absolute % covu3 Dominant Species? Indicator Status Dominance Test Worksheet 1. Alnus rubra 100 Yes FAC Number of Dominant Species 4 that are OBL, FACW, or FAC: (A) 2 3 Total Number of Dominant 4 Species Across All Strata: (B) q Sapling/Shrub Stratum (Plot size: 3m diam.) = Total Cover Percent of Dominant Species that are OBL, FACW, or FAC: 100 (A/B) 1. Comus sericea 90 Yes FAC Prevalence Index Worksheet Tc(a1 % CQ_v_ar ns Multiply by OBL species x 1 = 2. Rubus s ctabilis 20 Yes FAC 3 q FACW species x 2 = 5 FAC species x 3 = Herb Stratum (Plot size: 1 m diam.) = Total Cover FACU species x 4 = UPL species x 5 = Column totals (A) (B 1- Tolmeia menziesii 75 Yes FAC Prevalence Index = B / A = 2. 3. q_ H dra h is Ve station Indicators 5 ® Dominance test is > 50% ❑ Prevalence test is 5 3.0 * Morphological Adaptations * (provide supporting ❑ data in remarks or on a separate sheet) ❑ Wetland Non -Vascular Plants * ❑ Problematic Hydrophytic Vegetation * (explain) 6 7 B. 9 10 11 * Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic WoodVine Stratum (Plot site: = Tolal Cover Hydrophytic Vegetation Present? Yes No 1. 2. =Total Cover % Bare Ground in Herb Stratum: Remarks: US Army Corps of Engineers Western Mountains, Valleys, and Coast — Interim Version SOIL Sampling Point — DP„° Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.) -Depth Matrix Redox Features (inches) Color (moist) % Color (moist) % Type' Loe Texture Remarks 0-5 10YR 312 88 10YR 4/6 2 C M Clay loam 2.5Y 5/1 10 D M 5-14 5Y 411 85 10YR 4/6 15 C M Clay 'Type: C=Concentration, D=Depletion, RM-Reduced Matrix, CS- Covered or Coated Sand Grains 'Loc: PL=Pore Lining, M=Matrix Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.) Indicators for Problematic Hydric Soils3 ❑ Histosol (All) ❑ Sandy Redox (S5) ❑ 2cm Muck (Al0) ❑ Histic Epipedon (A2) ❑ Stripped Matrix (S6) ❑ Red Parent Material (TF2) ❑ Black Histic (A3) ❑ Loamy Mucky Mineral (F1) (except MLRA 1) ❑ Other (explain in remarks) ❑ Hydrogen Sulfide (A4) ❑ Loamy Gleyed Matrix (F2) ❑ ❑ Depleted Below Dark Surface (Al 1) ® Depleted Matrix (F3) ❑ Thick Dark Surface (Al2) ® Redox Dark Surface (F6) 3 Indicators of hydrophytic vegetation and wetland hydrology must ❑ Sandy Mucky Mineral (S1) ❑ Depleted Dark Surface (F7) be present, unless disturbed or problematic ❑ Sandy Gleyed Matrix (S4) ❑ Redox Depressions (F8) Restrictive Laver (if present): Type: Hydric soil present? Yes ® No Depth (inches): Remarks: HYDROLOGY Wetland Hydrology Indicators: Primary Indicators (minimum of one required: check all that apply): Secondary Indicators (2 or more required): ❑ Surface water (Al) ❑ Sparsely Vegetated Concave Surface (B8) ❑ Water -Stained Leaves (B9) (MLRA 1, 2, 4A & 4B) ❑ High Water Table (A2) ❑ Water -Stained Leaves (except MLRA 1, 2, 4A & 4B) (69) ❑ Drainage Patterns (610) ❑ Saturation (A3) ❑ Salt Crust (B11) ❑ Dry -Season Water Table (C2) ❑ Water Marks (B1) ❑ Aquatic Invertebrates (613) ❑ Saturation Visible on Aerial Imagery (C9) ❑ Sediment Deposits (B2) ❑ Hydrogen Sulfide Odor (Cl) ® Geomorphic Position (D2) ❑ Drift Deposits (B3) ❑ Oxidized Rhizospheres along Living Roots (C3) ❑ Shallow Aquitard (133) ❑ Algal Mat or Crust (64) ❑ Presence of Reduced Iron (C4) ® FAC-Neutral Test (135) ❑ Iron Deposits (135) ❑ Recent Iron Reduction in Tilled Soils (C6) ❑ Raised Ant Mounds (136) (LRR A) ❑ Surface Soil Cracks (B6) ❑ Stunted or Stressed Plants (D1) (LRR A) ❑ Frost -Heave Hummocks ❑ Inundation Visible on Aerial Imagery ❑ Other (explain in remarks) (B7) Field Observations Surface Water Present? Yes ❑ No [9 Depth (in): Water Table Present? Yes I--] No ® Depth (in): Wetland Hydrology Present? Yes No LJ Saturation Present? Yes C No ® Depth (in): (includes capillary fringe) Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available: Remarks: Soil damp but not saturated. Late in a very hot, dry summer. US Army Corps of Engineers Western Mountains, Valleys, and Coast- Interim Version THE WETLAND DETERMINATION DATA FORM 750 Sixth Street South WATERSHED Western Mountains, Valleys, and Coast Supplement to the Kirkland, Washington 98033 COMPANY 1987 COE Wetlands Delineation Manual FFD (425) 822-5242 watershedco.com Project Site: Redondo WWTP Sampling Date: 9/112015 Applicant/Owner: l.akehaven Utility District Sampling Point: DP- 4 Investigator: Kahlo, Muters, C City/County: Des Moines 1 King Co. Sect., Township. Range' S 5 T 21N R 4E State: WA Landform (hillslope, terrace, etc): Hillslope Slope (%): 10 Local relief (concave, convex, none): Concave Subregion (LRR): A Let: Long: Datum: Soil Map Unit Name: Alderwood and Kitsap Soils, Very Steep NWI classification: None Are climatic/hydrologic conditions on the site typical for this time of year? ® Yes ❑ No (If no, explain in remarks.) Are "Normal Circumstances" present on the site? ® Yes ❑ No Are Vegetation [I, Soil ❑, or Hydrology ❑ significantly disturbed? (If needed, explain any answers in Remarks.) Are Vegetation❑. Soil ❑, or Hydrology ❑ naturally problematic SUMMARY OF FINDINGS —Attach site map showing sampling oint locations transects Important features, etc. Hydrophytic Vegetation Present? Yes M No ❑ i Hydric Soils Present? Yes M No ❑ Is the Sampling Point within a Wetland? Yes ❑X No Wetland Hydrology Present? Yes ® No ❑ _T Remarks: Data point located at base of retaining wall. Wetland is primarily located above the wall, extending east E� Tree Stratum (Plot size: 5m diam.) Absolute % Cover Dominant Species? Indicator Status Dominance Test Worksheet 1. Alnus rubra 80 Yes FAC Number of Dominant Species that are OBL, FACW, or FAC: 2 (A) 2. Acermacro h Ilum 25 No* FACU 3. Tsu a hetero h lla 25 No` FACU Total Number of Dominant 2 Species Across All Strata: (B) 4 Sapling/Shrub Stratum (Plot size: 3m diam.) = Tola! Cover Percent of Dominant Species that are OBL, FACW, or FAC: 100 (A/B) 1. Prevalence Index Worksheet Total % Cover of Multiply by OBL species x 1 = 2 3 4 FACW species x 2 = 5 FAC species x 3 = Herb Stratum (Plot size: 1m diam.) =Total Cover FACU species x 4 = UPL species x 5 = Column totals (A) B 1. E uisetum telmateia 60 Yes FACW Prevalence Index = B / A = 2. 3. 4. Hydrophytic Vegetation Indicators 5 ® Dominance test is > 50% ❑ Prevalence test is 5 3.0 Morphological Adaptations' (provide supporting ❑ data in remarks or on a separate sheet) ❑ Wetland Non -Vascular Plants * ❑ Problematic Hydrophytic Vegetation' (explain) 6 9 9 10 11. • Indicators of hydric soil and wetland hydrology must be present, unless disturbed or problematic Woody Vine Stratum (Plot size: = Total Cover Hydrophytic Vegetation Yes LXJ No Present? 1. 2. = Total Cover % Bare Ground in Herb Stratum: Remarks: *Rooted outside of wetland US Army Corps of Engineers Western Mountains, Valleys, and Coast — Interim Version SOIL Sampling Point — DP-4 Profile Description: (Describe to the depth needed to document the indicator or confirm the absence of indicators.) Depth Matrix Redox Features (inches) Texture Remarks Color (moist) % Color (moist) % Typel Loc` 0-8 10YR 3/2 50 10YR 4/6 15 C M Sandy loam 10GY 4/1 35 D M 8+ Compact gravel & cobble 'Type: C=Concentration, D=Depletion, RM-Reduced Matrix, CS=Cuvered or Coated Sand Grains ZLoc: PL=Pore Lining, M=Matrix Hydric Soil Indicators: (Applicable to all LRRs, unless otherwise noted.) Indicators for Problematic Hydric Soils3 ❑ Histosol (Al) ❑ Sandy Redox (S5) ❑ 2cm Muck (Al0) ❑ Histic Epipedon (A2) ❑ Stripped Matrix (S6) ❑ Red Parent Material (TF2) ❑ Black Histic (A3) ❑ Loamy Mucky Mineral (F1) (except MLRA 1) ❑ Other (explain in remarks) ❑ Hydrogen Sulfide (A4) ❑ Loamy Gleyed Matrix (F2) ❑ ❑ Depleted Below Dark Surface (Al 1) ❑ Depleted Matrix (F3) ❑ Thick Dark Surface (Al2) ® Redox Dark Surface (F6) 3 Indicators of hydrophytic vegetation and wetland hydrology must ❑ Sandy Mucky Mineral (Si) ❑ Depleted Dark Surface (F7) be present, unless disturbed or problematic ❑ Sandy Gleyed Matrix (S4) ❑ Redox Depressions (F8) Restrictive Layer (if present): Type: Hydric soil present? Yes © No Depth (inches): Remarks: CII�] Z61RaIH1 Wetland Hydrology Indicators: Primary Indicators (minimum of one required: check all that apply): Secondary Indicators (2 or more required): ❑ Surface water (Al) ❑ Sparsely Vegetated Concave Surface (138) ❑ Water -Stained Leaves (139) (MLRA 1, 2, 4A & 4B) ® High Water Table (A2) ❑ Water -Stained Leaves (except MLRA 1, 2, 4A & 4B) (B9) ❑ Drainage Patterns (1310) ® Saturation (A3) ❑ Salt Crust (B11) ❑ Dry -Season Water Table (C2) ❑ Wafer Marks (B1) ❑ Aquatic Invertebrates (B13) ❑ Saturation Visible on Aerial Imagery (C9) ❑ Sediment Deposits (B2) ❑ Hydrogen Sulfide Odor (Cl) ❑ Geomorphic Position (132) ❑ Drift Deposits (133) ❑ Oxidized Rhizospheres along Living Roots (C3) ❑ Shallow Aquitard (D3) ❑ Algal Mat or Crust (134) ❑ Presence of Reduced Iron (C4) ❑ FAC-Neutral Test (135) ❑ Iron Deposits (135) ❑ Recent Iron Reduction in Tilled Soils (C6) ❑ Raised Ant Mounds (D6) (LRR A) ❑ Surface Soil Cracks (B6) ❑ Stunted or Stressed Plants (131) (LRR A) ❑ Frost -Heave Hummocks ❑ Inundation Visible on Aerial Imagery ❑ Other (explain in remarks) (B7) Field Observations Surface Water Present? Yes 0- No ® Depth (in): Water Table Present? Yes Z No ElDepth (in): 1 Wetland Hydrology Present? Yes JX No CI Saturation Present? Yes :S1 No ❑ Depth (in): 0 (includes capillary fringe) Describe Recorded Data (stream gauge, monitoring well, aerial photos, previous inspections), if available: Remarks: 1 US Army Corps of Engineers Western Mountains, Valleys, and Coast - Interim Version Wetland name or number: Wetland A RATING SUMMARY - Western Washington Name of wetland (or ID #): Wetland A Date of site visit: 9 1 2015 Rated by: Kahlo, R; Muters, CTrained by Ecology? ©Y El Date of training: 09 2014 HGM Class used for rating: Slope Wetland has multiple HGM classes? El ON NOTE: Form is not complete without the figures requested (figures can be combined). Source of base aerial photo/map: King County WAP OVERALL WETLAND CATEGORY (based on functions ❑ or special characteristics ❑) 1. Category of wetland based on FUNCTIONS ❑ Category I — Tota I score = 23 - 27 ❑ Category II — Total score = 20 - 22 ® Category III — Total score = 16 - 19 ❑ Category IV —Total score = 9 -15 FUNCTION Improving Hydrologic Habitat Water Quality _y Site Potential H M L H Landscape Potential H M L H Value H M L H :Score Based on 5 Ratings Circle the appropriate ratings M L H M L M L H M L M L H M L TOTAL 5 1 6 1 16 2. Category based on SPECIAL CHARACTERISTICS of wetland CHARACTERISTIC CATEGORY Estuarine I II Wetland of High Conservation Value I Bog I Mature Forest I Old Growth Forest I Coastal Lagoon I II Interdunal I II III IV None of the above Score for each function based on three ratings (order of ratings is not important) 9 = H,H,H 8 = H,H,M 7 = H,H,L 7 = H,M,M 6 = H,M,L 6 = M,M,M 5 = H,L,L 5 = M,M,L 4 = M,L,L 3 = L,L,L Wetland Rating System for Western WA: 2014 Update 1 Rating Form - Effective January 1, 2015 Wetland name or number: Wetland A Maps and figures required to answer questions correctly for Western Washington Deoressional Wetlands Map of: To answer questions. Figure # Cowardin plant classes D 1.3, H 1.1, H 1.4 Hydroperiods D 1.4, H 1.2 Location of outlet (can be added to map of hydroperiods) D 1.1, D 4.1 Boundary of area within 150 ft of the wetland (can be added to anotherfigure) D 2.2, D 5.2 Map of the contributing basin D 4.3, D 5.3 1 km Polygon: Area that extends 1 km from entire wetland edge - including polygons for accessible habitat and undisturbed habitat H 2.1, H 2.2, H 2.3 Screen capture of map of 303(d) listed waters in basin (from Ecology website) D 3.1, D 3.2 Screen capture of list of TMDLs for WRIA in which unit is found (from web) D 3.3 Riverine Wetlands Map of: To answer questions: Figure # Cowardin plant classes H 1.1, H 1.4 Hydroperiods H 1.2 Ponded depressions R 1.1 Boundary of area within 150 ft of the wetland (can be added to anotherfigure) R 2.4 Plant cover of trees, shrubs, and herbaceous plants R 1.2, R 4.2 Width of unit vs. width of stream (can be added to anotherfigure) R 4.1 Map of the contributing basin R 2.2, R 2.3, R 5.2 1 km Polygon: Area that extends 1 km from entire wetland edge - including polygons for accessible habitat and undisturbed habitat H 2. 1, H 2.2, H 2.3 Screen capture of map of 303(d) listed waters in basin (from Ecology website) R 3.1 Screen capture of list of TMDLs for WRIA in which unit is found (from web) R 3.2, R 3.3 Lake Fringe Wetlands Map of: To answer questions: Figure # Cowardin plant classes L 1.1, L 4.1, H 1.1, H 1.4 Plant cover of trees, shrubs, and herbaceous plants L 1.2 Boundary of area within 150 ft of the wetland (can be added to anotherfigure) L 2.2 1 km Polygon: Area that extends 1 km from entire wetland edge - including polygons for accessible habitat and undisturbed habitat H 2.1, H 2.2, H 2.3 Screen capture of map of 303(d) listed waters in basin (from Ecology website) L 3.1, L 3.2 Screen capture of list of TMDLs for WRIA in which unit is found (from web) L 3.3 Slope Wetlands Map of: To answer questions: Figure # Cowardin plant classes H 1.1, H 1.4 2 Hydroperiods H 1.2 2 Plant cover of dense trees, shrubs, and herbaceous plants S 1.3 1 Plant cover of dense, rigid trees, shrubs, and herbaceous plants (can be added to figure above) S 4.1 1 Boundary of 150 ft buffer (can be added to another figure) S 2.1, S 5.1 2 1 km Polygon: Area that extends 1 km from entire wetland edge - including polygons for accessible habitat and undisturbed habitat H 2.1, H 2.2, H 2.3 3 Screen capture of map of 303(d) listed waters in basin (from Ecology website) S 3.1, S 3.2 Screen capture of list of TMDLs for WRIA in which unit is found (from web) S 3.3 Wetland Rating System for Western WA: 2014 Update Rating Form - Effective January 1, 2015 Wetland name or number: Wetland A HGM Classification of Wetlands in Western Washington For questions 1-7, the criteria described must apply to the entire unit being rated. If the hydrologic criteria listed in each question do not apply to the entire unit being rated, you probably have a unit with multiple HGM classes. In this case, identify which hydrologic criteria in questions 1-7 apply, and go to Question 8. 1. Are the water levels in the entire unit usually controlled by tides except during floods? ONO -goto2 ❑YES - the wetland class is Tidal Fringe - go to 1.1 1.1 Is the salinity of the water during periods of annual low flow below 0.5 ppt (parts per thousand)? NO - Saltwater Tidal Fringe (Estuarine) YES - Freshwater Tidal Fringe Ifyour wetland can be classified as a Freshwater Tidal Fringe use the forms for Riverine wetlands. If it is Saltwater Tidal Fringe it is an Estuarine wetland and is not scored. This method cannot be used to score functions for estuarine wetlands. 2. The entire wetland unit is flat and precipitation is the only source (>90%) of water to it. Groundwater and surface water runoff are NOT sources of water to the unit. ®NO - go to 3 ❑YES - The wetland class is Flats Ifyour wetland can be classified as a Flats wetland, use the form for Depressional wetlands. 3. Does the entire wetland unit meet all of the following criteria? ❑ The vegetated part of the wetland is on the shores of a body of permanent open water (without any plants on the surface at anytime of the year) at least 20 ac (8 ha) in size; ❑At least 30% of the open water area is deeper than 6.6 ft (2 m). ONO -goto4 ❑YES - The wetland class is Lake Fringe (Lacustrine Fringe) 4. Does the entire wetland unit meet all of the following criteria? ❑x The wetland is on a slope (slope can be very gradual), ❑x The water flows through the wetland in one direction (unidirectional) and usually comes from seeps. It may flow subsurface, as sheetflow, or in a swale without distinct banks, ❑x The water leaves the wetland without being impounded. ❑NO-goto5 ©YES - The wetland class is Slope NOTE: Surface water does not pond in these type of wetlands except occasionally in very small and shallow depressions or behind hummocks (depressions are usually <3 ft diameter and less than 1 ft deep). S. Does the entire wetland unit meet all of the following criteria? ❑ The unit is in a valley, or stream channel, where it gets inundated by overbank flooding from that stream or river, ❑ The overbank flooding occurs at least once every 2 years. Wetland Rating System for Western WA: 2014 Update Rating Form - Effective January 1, 2015 Wetland name or number: Wetland A ❑NO -go to 6 ❑YES - The wetland class is Riverine NOTE: The Riverine unit can contain depressions that are filled with water when the river is not flooding 6. Is the entire wetland unit in a topographic depression in which water ponds, or is saturated to the surface, at sometime during the year? This means that any outlet, if present, is higher than the interior of the wetland. ❑NO-goto7 ❑YES - The wetland class is Depressional 7. Is the entire wetland unit located in a very flat area with no obvious depression and no overbank flooding? The unit does not pond surface water more than a few inches. The unit seems to be maintained by high groundwater in the area. The wetland may be ditched, but has no obvious natural outlet. ❑NO-goto8 ❑YES - The wetland class is Depressional 8. Your wetland unit seems to be difficult to classify and probably contains several different HGM classes. For example, seeps at the base of a slope may grade into a riverine floodplain, or a small stream within a Depressional wetland has a zone of flooding along its sides. GO BACK AND IDENTIFY WHICH OF THE HYDROLOGIC REGIMES DESCRIBED IN QUESTIONS 1-7 APPLY TO DIFFERENT AREAS IN THE UNIT (make a rough sketch to help you decide). Use the following table to identify the appropriate class to use for the rating system if you have several HGM classes present within the wetland unit being scored. NOTE: Use this table only if the class that is recommended in the second column represents 10% or more of the total area of the wetland unit being rated. If the area of the HGM class listed in column 2 is less than 10% of the unit; classify the wetland using the class that represents more than 90% of the total area. HGM classes within the wetland unit being rated HGM class to use in rating Slope + Riverine Riverine Slope + Depressional Depressional Slope + Lake Fringe Lake Fringe Depressional + Riverine along stream within boundary of depression Depressional Depressional + Lake Fringe Depressional Riverine + Lake Fringe Riverine Salt Water Tidal Fringe and any other class of freshwater wetland Treat as ESTUARINE Ifyou are still unable to determine which of the above criteria apply to your wetland, or ifyou have more than 2 HGM classes within a wetland boundary, classify the wetland as Depressional for the rating. Wetland Rating System for Western WA: 2014 Update 4 Rating Form - Effective January 1, 2015 Wetland name or number: Wetland A SLOPE WETLANDS Water Quality Functions - Indicators that the site functioris to improve water quafity S 1.0. Does the site have the potential to improve water quality? S 1.1. Characteristics of the average slope of the wetland: (a 1%slope has a 1 ft vertical drop in elevation for every 100 ft of horizontal distance) Slope is 1% or less points = 3 0 Slope is > 1%-2% points = 2 Slope is > 2%-5 % points =1 Slope is greater than 5% points = 0 S 1.2. The soii 2 in below the surface or duff la er is true clay or true organic (use NRCS definitions): Yes = 3 No = 0 0 S 1.3. Characteristics of the plants in the wetland that trap sediments and pollutants: Choose the points appropriate for the description that best fits the plants in the wetland. Dense means you have trouble seeing the soil surface (>75% cover), and uncut means not grazed or mowed and plants are higher than 6 in. Dense, uncut, herbaceous plants > 90% of the wetland area points = 6 3 Dense, uncut, herbaceous plants > % of area points = 3 Dense, woody, plants > % of area points = 2 Dense, uncut, herbaceous plants > % of area points =1 Does not meet a ny of the criteria above for plants points = 0 Total for S 1 Add the points in the boxes above 3 Rating of Site Potential If score is: ❑ 12 = H ❑ 6-11= M 00-5 = L Record the rating on the first page S 2.0. Does the landscape have the potential to support the water quality function of the site? S 2.1. Is > 10%of the area within 150 ft on the uphill side of the wetland in land uses that generate pollutants? Yes=1 No= 0 1 S 2.2. Are there other sources of pollutants coming into the wetland that are not listed in question S 2.1? Othersources Yes =1 No = 0 0 Total for S 2 Add the points in the boxes above 1 Rating of Landscape Potential If score is: 01-2 = M ❑ 0 = L Record the rating on the first page S 3.0. Is the water quality improvement provided by the site valuable to society? S 3.1. Does the wetland discharge directly (i.e., within 1 mi) to a stream, river, lake, or marine water that is on the 303(d) list? Yes =1 No = 0 0 S 3.2. Is the wetland in a basin or sub -basin where water quality is an issue? At least one aquatic resource in the basin is on the 303(d) list. Yes =1 No = 0 1 S 3.3. Has the site been identified in a watershed or local plan as important for maintaining water quality? Answer YES if there is a TMDt for the basin in which unit is found. Yes = 2 No = 0 0 Total for S 3 Add the points in the boxes above 1 Rating of Value If score is: ❑2-4 = H 01= M ❑0 = L Record the rating on the first page w Wetland Rating System for Western WA: 2014 Update 11 Rating Form — Effective January 1, 2015 Wetland name or number: Wetland A SLOPE WETLANDS Hydrologic Functions - Indicators that the site functions to reduce flooding and stream erosion S 4.0. Does the site have the potential to reduce flooding and stream erosion? S 4.1. Characteristics of plants that reduce the velocity of surface flows during storms: Choose the points appropriate for the description that best fits conditions in the wetland. Stems of plants should be thick enough (usually>1188 in), or dense enough, to remain erect during surface flows. 0 Dense, uncut, rigid plants cover> 90% of the area of the wetland points =1 All other conditions points = 0 Rating of Site Potential If score is: ❑ 1= M 00 = L Record the rating on the first page S 5.0. Does the landscape have the potential to support the hydrologic functions of the site? S 5.1. Is more than 25% of the area within 150 ft upslope of wetland inland uses or cover that generate excess 0 surface runoff? Yes =1 No = 0 Rating of Landscape Potential If score is: ❑ 1= M 00 = L Record the rating on the first page S 6.0. Are the hydrologic functions provided by the site valuable to society? S 6.1. Distance to the nearest areas downstream that have flooding problems: The sub -basin immediately down -gradient of site has flooding problems that result in damage to human or natural resources (e.g., houses or salmon redds) points = 2 2 Surface flooding problems are in a sub -basin farther down -gradient points =1 Noflooding problems anywhere downstream points = 0 S 6.2. Has the site been identified as important for flood storage or flood conveyance in a regional flood control plan? 0 Yes=2 No=O Total for S 6 Add the points in the boxes above 2 Rating of Value If score is: ®2-4 = H ❑ 1= M ❑0 = L Record the rating on the first page NOTES and FIELD OBSERVATIONS: Wetland Rating System for Western WA: 2014 Update 12 Rating Form - Effective January 1, 2015 Wetland name or number: Wetland A I These questions apply to wetlands of all H G M classes. HABITAT FUNCTIONS - Indicators that site functions to provide important habitat H 1.0. Does the site have the potential to provide habitat? H 1.1. Structure of plant community: Indicators are Cowardin classes and strata within the Forested class. Check the Cowardin plant classes in the wetland. Up to 10 patches may be combined for each class to meet the threshold of'< ac or more than 10% of the unit if it is smaller than 2.5 ac. Add the number of structures checked. ❑ Aquatic bed 4 structures or more: points = 4 ❑ Emergent 3 structures: points = 2 ® Scrub -shrub (areas where shrubs have > 30% cover) 2 structures: points =1 2 ® Forested (areas where trees have > 30% cover) 1 structure: points =0 If the unit has a Forested class, check if.• ® The Forested class has 3 out of 5 strata (canopy, sub -canopy, shrubs, herbaceous, moss/ground-cover) that each cover 20% within the Forested polygon H 1.2. Hydroperiods Check the types of water regimes (hydroperiods) present within the wetland. The water regime has to cover more than 10% of the wetland or % ac to count (see text for descriptions of hydroperiods). ❑ Permanently flooded or inundated 4 or more types present: points = 3 ❑ Seasonally flooded or inundated 3 types present: points = 2 ® Occasionally flooded or inundated 2 types present: points =1 2 ® Saturated only 1 type present: points = 0 ® Permanently flowing stream or river in, or adjacent to, the wetland ❑ Seasonally flowing stream in, or adjacent to, the wetland ❑ Lake Fringe wetland 2 points ❑ Freshwater tidal wetland 2 points H 1.3. Richness of plant species Count the number of plant species in the wetland that cover at least 10 ftz. Different patches of the some species can be combined to meet the size threshold and you do not have to name the species. Do not include Eurasian milfoil, reed canarygrass, purple loosestrife, Canadian thistle 2 If you counted: > 19 species points = 2 5 -19 species points =1 < 5 species points = 0 H 1.4. Interspersion of habitats Decide from the diagrams below whether interspersion among Cowardin plants classes (described in H 1.1), or the classes and unvegetated areas (can include open water or mudflats) is high, moderate, low, or none. If you have four or more plant classes or three classes and open water, the rating is always high. CI*D( 2 None = 0 points Low =1 point Moderate = 2 points All three diagrams -• in this row are HIGH = 3points Wetland Rating System for Western WA: 2014 Update Rating Form — Effective January 1, 2015 13 Wetland name or number: Wetland A H 1.5. Special habitat features: Check the habitat features that are present in the wetland. The number of checks is the number of points. ® Large, downed, woody debris within the wetland (> 4 in diameter and 6 ft long). ® Standing snags (dbh > 4 in) within the wetland ® Undercut banks are present for at least 6.6 ft (2 m) and/or overhanging plants extends at least 3.3 ft (1 m) over a stream (or ditch) in, or contiguous with the wetland, for at least 33 ft (10 m) ❑ Stable steep banks of fine material that might be used by beaver or muskrat for denning (> 30 degree 4 slope) OR signs of recent beaver activity are present (cut shrubs or trees that have not yet weathered where wood is exposed) ❑ At least % ac of thin -stemmed persistent plants or woody branches are present in areas that are permanently or seasonally inundated (structures for egg -laying by amphibians) ® Invasive plants cover less than 25% of the wetland area in every stratum of plants (see H 1.1 for list of strata) Total for H 1 Add the points in the boxes above 1 12 1 Rating of Site Potential If score is: ❑ 15-18 = H 07-14 = M ❑ 0-6 = L Record the rating on the first page H 2.0. Does the landscape have the potential to support the habitat functions of the site? H 2.1. Accessible habitat (include onlyhabitat that directlyabuts wetland unit). Calculate: % undisturbed habitat: 7 + [(% moderate and low intensity land uses)0/2]: 0 = 7% If total accessible habitat is: > 1/3 (33.3%) of 1 km Polygon points = 3 0 20-33% of 1 km Polygon points = 2 10-19% of 1 km Polygon points =1 < 10% of 1 km Polygon points = 0 H 2.2. Undisturbed habitat in 1 km Polygon around the wetland. Calculate: % undisturbed habitat: 7 + [(% moderate and low intensity land uses)24/2]:12 =19% Undisturbed habitat > 50% of Polygon points = 3 1 Undisturbed habitat 10-50% and in 1-3 patches points = 2 Undisturbed habitat 10-50% and > 3 patches points =1 Undisturbed habitat < 10% of 1 km Polygon points = 0 H 2.3. Land use intensity in 1 km Polygon: If > 50% of 1 km Polygon is high intensity land use points = (- 2) -2 _< 50% of 1 km Polygon is high intensity points = 0 Total for H 2 Add the points in the boxes above -1 Rating of Landscape Potential If score is: 04-6 = H 01-3 = M ®< 1= L I H 3.0. Is the habitat provided by the site valuable to society? Record the rating on the first page H 3.1. Does the site provide habitat for species valued in laws, regulations, or policies? Choose only the highest score that applies to the wetland being rated. Site meets ANY of the following criteria: points = 2 ® It has 3 or more priority habitats within 100 m (see next page) ❑ It provides habitat for Threatened or Endangered species (any plant or animal on the state or federal lists) ❑ It is mapped as a location for an individual WDFW priority species ❑ It is a Wetland of High Conservation Value as determined by the Department of Natural Resources ❑ It has been categorized as an important habitat site in a local or regional comprehensive plan, in a Shoreline Master Plan, or in a watershed plan Site has 1 or 2 priority habitats (listed on next page) within 100 m points =1 Site does not meet any of the criteria above Rating of Value If score is: 02 = H 01= M 00 = L Wetland Rating System for Western WA: 2014 Update Rating Form — Effective January 1, 2015 M Record the rating on the first page 14 Wetland name or number: Wetland A WDFW Priority Habitats Priority habitats listed by WDFW (see complete descriptions of WDFW priority habitats, and the counties in which they can be found, in: Washington Department of Fish and Wildlife. 2008. Priority Habitat and Species List. Olympia, Washington. 177pp.htt//wd&.wa.gov/(publications100165/wdfwOO165_pdforaccessthelistfromhere: hUp://wdfw.wa.gov/conser-va.tLn hs list ) Count how many of the following priority habitats are within 330 ft (100 m) of the wetland unit: NOTE. This question is independent of the land use between the wetland unitand the priority habitat ❑ Aspen Stands: Pure or mixed stands of aspen greater than .1 ac (0.4 ha). ❑ Biodiversity Areas and Corridors: Areas of habitat that are relatively important to various species of native fish and wildlife (full descriptions in WDFWPHS report). ❑ Herbaceous Balds: Variable size patches of grass and fortis on shallow soils over bedrock ❑ Old-growth/Mature forests: Old -growth west of Cascade crest -- Stands of at least 2 tree species, forming a multi- layered canopy with occasional small openings; with at least 8 trees/ac (20 trees/ha) > 32 in (81 cm) dbb or > 200 years of age. Mature forests - Stands with average diameters exceeding 21 in (53 cm) dbh; crown cover maybe less than 100%; decay, decadence, numbers of snags, and quantity of large downed material is generally less than that found in old -growth; 80-200 years old west of the Cascade crest. ❑ Oregon White Oak: Woodland stands of pure oak or oak/conifer associations where canopy coverage of the oak component is important (full descriptions in WDFW PHS report p.158 - see web link above). ® Riparian: The area adjacent to aquatic systems with flowing water that contains elements of both aquatic and terrestrial ecosystems which mutually influence each other. ❑ Westside Prairies: Herbaceous, non -forested plant communities that can either take the form of a dry prairie or a wet prairie (full descriptions in 14'DFW PHS report p.161 -see web link above). ® Instream: The combination of physical, biological, and chemical processes and conditions that interact to provide functional life history requirements for instream fish and wildlife resources. ❑ Nearshore: Relatively undisturbed nearshore habitats. These include Coastal Nearshore, Open Coast Nearshore, and Puget Sound Nearshore. (full descriptions of habitats and the definition of relatively undisturbed are in WDFW report- see web link on previous page). ❑ Caves: A naturally occurring cavity, recess, void, or system of interconnected passages under the earth in soils, rock, ice, or other geological formations and is large enough to contain a human. ❑ Cliffs: Greater than 25 ft (7.6 m) high and occurring below 5000 ft elevation. ❑ Talus: Homogenous areas of rock rubble ranging in average size 0.5 - 6.5 ft (0.15 - 2.0 m), composed of basalt, andesite, and/or sedimentary rock, including riprap slides and mine tailings. Maybe associated with cliffs. ® Snags and Logs: Trees are considered snags if they are dead or dying and exhibit sufficient decay characteristics to enable cavity excavation/use by wildlife. Priority snags have a diameter at breast height of > 20 in (51 cm) in western Washington and are > 6.5 ft (2 m) in height. Priority logs are > 12 in (30 cm) in diameter at the largest end, and > 20 ft (6 m) long. 1 Note: All vegetated wetlands are by definition a priority habitat but are not included in this list because they are addressed elsewhere. Wetland Rating System for Western WA: 2014 Update Rating Form - Effective January 1, 2015 15 Wetland name or number: Wetland A CATEGORIZATION BASED ON SPECIAL CHARACTERISTICS Wetland Type Category Check off anycriteria that apply to the tv rfvnd. Circe the category rfhFn the appropriate cr€ PM7 01'Y mF . SC 1.0. Estuarine wetlands Does the wetland meet the following criteria for Estuarine wetlands? ❑ The dominant water regime is tidal, ❑ Vegetated, and ❑ With a salinity greater than 0.5 ppt ❑Yes —Go to SC 1.1 ❑ No= Not an estuarine wetland SC 1.1. Is the wetland within a National Wildlife Refuge, National Park, National Estuary Reserve, Natural Area Preserve, State Park or Educational, Environmental, or Scientific Reserve designated under WAC 332-30-151? Cat. ❑Yes = CategoryI ❑ No - Go to SC 1.2 SC 1.2. Is the wetland unit at least 1 ac in size and meets at least two of the following three conditions? ❑ The wetland is relatively undisturbed (has no diking, ditching, filling, cultivation, grazing, and has Cat. less than 10% cover of non-native plant species. (If non-native species are Spartina, see page 25) ❑ At least % of the landward edge of the wetland has a 100 ft buffer of shrub, forest, or un-grazed or un- mowed grassland. Cat. II ❑ The wetland has at least two of the following features: tidal channels, depressions with open water, or contiguous freshwater wetlands. ❑ Yes = Category ) ❑No= Category )) SC 2.0. Wetlands of High Conservation Value (WHCV) SC 2.1. Has the WA Department of Natural Resources updated their website to include the list of Wetlands of High Conservation Value? ❑Yes — Go to SC 2.2 ❑ No — Go to SC 2.3 SC 2.2. Is the wetland listed on the WDNR database as a Wetland of High Conservation Value? ❑Yes = CategoryI ❑ No = Not a WHCV SC 2.3. Is the wetland in a Section/Township/Range that contains a Natural Heritage wetland? Cat. http://wwwl.dnr.wa.gov/nhp/refdesk/datasearch/wnhpwetiands.pdf ❑Yes — Contact WNHP/WDNR and go to SC 2.4 ❑ No = Not a WHCV SC 2.4. Has WDNR identified the wetland within the S/T/R as a Wetland of High Conservation Value and listed it on their website? ❑Yes = CategoryI ❑ No = Not a WHCV SC 3.0. Bogs Does the wetland (or any part of the unit) meet both the criteria for soils and vegetation in bogs? Use the key below. If you answer YES you will still need to rate the wetland based on its functions. SC 3.1. Does an area within the wetland unit have organic soil horizons, either peats or mucks, that compose 16 in or more of the first 32 in of the soil profile? ❑Yes — Go to SC 3.3 ❑ No — Go to SC 3.2 SC 3.2. Does an area within the wetland unit have organic soils, either peats or mucks, that are less than 16 in deep over bedrock, or an impermeable hardpan such as clay or volcanic ash, or that are floating on top of a lake or pond? ❑Yes — Go to SC 3.3 ❑ No = Is not a bog SC 3.3. Does an area with peats or mucks have more than 70% cover of mosses at ground level, AND at least a 30% Cat. cover of plant species listed in Table 4? ❑Yes = Is a Category I bog ❑ No — Go to SC 3.4 NOTE: If you are uncertain about the extent of mosses in the understory, you may substitute that criterion by measuring the pH of the water that seeps into a hole dug at least 16 in deep. If the pH is less than 5.0 and the plant species in Table 4 are present, the wetland is a bog. SC 3.4. Is an area with peats or mucks forested (> 30% cover) with Sitka spruce, subalpine fir, western red cedar, western hemlock, lodgepole pine, quaking aspen, Engelmann spruce, or western white pine, AND any of the species (or combination of species) listed in Table 4 provide more than 30% of the cover under the canopy? ❑Yes = Is a Category I bog ❑ No = Is not a bo Wetland Rating System for Western WA: 2014 Update 16 Rating Form — Effective January 1, 2015 Wetland name or number: Wetland A i J SC 4.0. Forested Wetlands Does the wetland have at least 1 contiguous acre of forest that meets one of these criteria for the WA Department of Fish and Wildlife's forests as priority habitats? If you answer YES you will still need to rate the wetland based on its functions. ❑ Old -growth forests (west of Cascade crest): Stands of at least two tree species, forming a multi -layered canopy with occasional small openings; with at least 8 trees/ac (20 trees/ha) that are at least 200 years of Cat. I age OR have a diameter at breast height (dbh) of 32 in (81 cm) or more. ❑ Mature forests (west of the Cascade Crest): Stands where the largest trees are 80- 200 years old OR the species that make up the canopy have an average diameter (dbh) exceeding 21 in (53 cm). ❑Yes = Category I ❑ No = Not a forested wetland for this section SC S.O. Wetlands in Coastal Lagoons Does the wetland meet all of the following criteria of a wetland in a coastal lagoon? ❑ The wetland lies in a depression adjacent to marine waters that is wholly or partially separated from marine waters by sandbanks, gravel banks, shingle, or, less frequently, rocks ❑ The lagoon in which the wetland is located contains ponded water that is saline or brackish (> 0.5 ppt) during most of the year in at least a portion of the lagoon (needs to be measured near the Cat. I bottom) ❑Yes — Go to SC 5.1 ❑ No = Not a wetland in a coastal lagoon SC 5.1. Does the wetland meet all of the following three conditions? ❑ The wetland is relatively undisturbed (has no diking, ditching, filling, cultivation, grazing), and has Cat. II less than 20% cover of aggressive, opportunistic plant species (see list of species on p.100). ❑ At least % of the landward edge of the wetland has a 100 ft buffer of shrub, forest, or un-grazed or un- mowed grassland. ❑ The wetland is larger than 1/io ac (4350 ftZ) ❑Yes = CategoryI ❑ No = CategoryIl SC 6.0. Interdunal Wetlands Is the wetland west of the 1889 line (also called the Western Boundary of Upland Ownership or WBUO)? If you answer yes you will still need to rate the wetland based on its habitat functions. Cat I In practical terms that means the following geographic areas: ❑ Long Beach Peninsula: Lands west of SR 103 ❑ Grayland-Westport: Lands west of SR 105 ❑ Ocean Shores-Copalis: Lands west of SR 115 and SR 109 Cat. II ❑Yes — Go to SC 6.1 ❑ No = not an interdunal wetland for rating SC 6.1. Is the wetland 1 ac or larger and scores an 8 or 9 for the habitat functions on the form (rates H,H,H or H,H,M Cat. III for the three aspects of function)? ❑Yes = CategoryI ❑ No — Go to SC 6.2 SC 6.2. Is the wetland 1 ac or larger, or is it in a mosaic of wetlands that is 1 ac or larger? ❑Yes = Category II ❑ No — Go to SC 6.3 Cat. IV SC 6.3. Is the unit between 0.1 and 1 ac, or is it in a mosaic of wetlands that is between 0.1 and 1 ac? ❑Yes = Category III ❑ No = CategoryIV Category of wetland based on Special Characteristics CI ick here to If you answered No for all types, enter "Not Applicable" on Summary Form antar text Wetland Rating System for Western WA: 2014 Update Rating Form — Effective January 1, 2015 17 Wetland name or number This page left blank intentionally Wetland Rating System for Western WA: 2014 Update 18 Rating Form - Effective January 1, 2015 ''��80b'1 � ` ,-N 1+• is 7. 5 284th St ' r �(+ "�: ..i,.. ••C. �_ •�r - .1 Sig, � . rPIP,` +�. 89th St ul *��:ily • ateWetla • L?.' .. SW d l4th gShTPi rd tp� ! g'Z 2 _ - r '� !; - yr• 12V - a SYo 297th'St Q ISBtSi 5t - - SW -93th PI h {�g1Y1� s4aa Sly! 299th St � � 5 � ` '•�� f � -� + . 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S 3081h St o� N ZP f a c SbY 312.th.S t S 312th St ^' SW 3�21h S! -- �- -- "/ N ILI I LaFn r r S 31 4th it i 7 raW i Figure 5: S3.3 WATER QUALITY IMPROVEMENT PROJECTS (TMDLs) Overview of the process Project Catalog by WRIA by County Funding Opportunities Project Development Priority Lists Related Information TMDL Contacts RELATED ECOLOGY PROGRAMS Water Quality Water Ouslity Im rovem nt �, Water Quality Imurovement Projects by WRIA 7 WRIA 9: Duti:amL_h•Gre=_n WRIA 9: Duwamish-Green c nnrs The following table lists overview information for water quality improvement projects (including total maximum daily loads, or TMDLs) for this water N resource inventory area Please use links (where available) for more rAc information on a project. * 2z z 12 Counties r King Waterbody Name PoOutants status** TMDL Lead Duwamish and Lovdar Ammonia-N Approved by EPA Joan Nolan 425-649-4425 Green River Fauntlerox Creek Fecal Coliform Approved by EPA Joan Nolan Has an implementation 425-649-4425 plan Fenwick Lake Total Phosphorus Approved by EPA (1993, Tricia Shoblam 425-649-7288 Clean Lakes Program) Category 5, 2008 Water Quality Assessment Green River and Temperature Green River TMOL Joan Nolan Newaukum Creek Dissolved Oxygen Approved by EPA 425-649-4425 Newaukum Creek TMDL Approved by EPA Has an implementation plan Lake SawN_er Total Phosphorus Approved by EPA Trivia Shairlam 425-649-7288 Has an implementation plan Sous Creek Fecal Coliform Under development Dave Garland 425-649-7031 Aquatic Habitat Joan Nolan Dissolved Oxygen 425-649-4425 Temperature "status will be listed as one of the following- Approved by EPA, Under Develapment or implementation For more information about WRIA 9: • Waterbodies in WRIA 9 - using the Water Quality Assessment Query Tool . Watershed tnformati_ n for WRIA 9 j* The Department of Ecology and other state resource agencies frequently use a sy_tem of 62 "Water Resource Inventory Areas" or "WRIAs" to refer to the state's major watershed basins. Wetland name or number: Wetland B RATING SUMMARY — Western Washington Name of wetland (or ID #): Wetland B Date of site visit: 9 1 2015 Rated by: Kahlo, R; Muters, CTrained by Ecology? MY ❑N Date of training: 09 2014 HGM Class used for rating: Slope Wetland has multiple HGM classes? ❑Y MN NOTE: Form is not complete without the figures requested (figures can be combined). Source of base aerial photo/map: King County MAP OVERALL WETLAND CATEGORY (based on functions ❑ or special characteristics ❑) 1. Category of wetland based on FUNCTIONS ❑ Category I —Total score = 23 - 27 ❑ Category li — Total score = 20 - 22 M Category III — Total score = 16 - 19 ❑ Category IV — Tota I score = 9 - 15 FUNCTION Improving Hydrologic Habitat j Water Quality ll Circle the appropriate ratings Site Potential H M L H M L H M L J Landscape Potential H M L H M L H M L Value H M L H M L H M L TOTAL Score Based on 5 6 5 16 Ratings J 1 J 2. Category based on SPECIAL CHARACTERISTICS of wetland CHARACTERISTIC CATEGORY Estuarine I II Wetland of High Conservation Value I Bog I Mature Forest I Old Growth Forest I Coastal Lagoon I II Interdunal I II III IV None of the above Wetland Rating System for Western WA: 2014 Update Rating Form - Effective January 1, 2015 Score for each function based on three ratings (order of ratings is not important) 9 = H,H,H 8 = H,H,M 7 = H,H,L 7 = H,M,M 6 = H, M, L 6 = M,M,M 5=H,L,L 5 = M, M, L 4 = M,L,L 3=L,L,L 1 Wetland name or number: Wetland B Maps and figures required to answer questions correctly for Western Washington Depressional Wetlands Map of: To answer questions: Figure # Cowardin plant classes D 1.3, H 1.1, H 1.4 Hydroperiods D 1.4, H 1.2 Location of outlet (can be added to map of hydroperiods) D 1.1, D 4.1 Boundary of area within 150 ft of the wetland (can be added to anotherfigure) D 2.2, D 5.2 Map of the contributing basin D 4.3, D 5.3 1 km Polygon: Area that extends 1 km from entire wetland edge - including polygons for accessible habitat and undisturbed habitat H 2.1, H 2.2, H 2.3 Screen capture of map of 303(d) listed waters in basin (from Ecology website) D 3.1, D 3.2 Screen capture of list of TMDLs for WRIA in which unit is found (from web) D 3.3 Riverine Wetlands Map of: To answer questions: Figure # Cowardin plant classes H 1.1, H 1.4 Hydroperiods H 1.2 Ponded depressions R 1.1 Boundary of area within 150 ft of the wetland (can be added to anotherfigure) R 2.4 Plant cover of trees, shrubs, and herbaceous plants R 1.2, R 4.2 Width of unit vs. width of stream (can be added to anotherfigure) R 4.1 Map of the contributing basin R 2.2, R 2.3, R 5.2 1 km Polygon: Area that extends 1 km from entire wetland edge - including polygons for accessible habitat and undisturbed habitat H 2. 1, H 2.2, H 2.3 Screen capture of map of 303(d) listed waters in basin (from Ecology website) R 3.1 Screen capture of list of TMDLs for WRIA in which unit is found (from web) R 3.2, R 3.3 Lake Fringe Wetlands Map of: To answer questions: L 1.1, L 4.1, H I.I. H 1.4 Figure # Cowardin plant classes i� Plant cover of trees, shrubs, and herbaceous plants L 1.2 Boundary of area within 150 ft of the wetland (can be added to anotherfigure) L 2.2 1 km Polygon: Area that extends 1 km from entire wetland edge - including polygons for accessible habitat and undisturbed habitat H 2.1, H 2.2, H 2.3 Screen capture of map of 303(d) listed waters in basin (from Ecology website) L 3.1, L 3.2 Screen capture of list of TMDLs for WRIA in which unit is found (from web) L 3.3 Slope Wetlands Map of: To answer questions: Figure # Cowardin plant classes H 1.1, H 1.4 2 Hydroperiods H 1.2 2 Plant cover of dense trees, shrubs, and herbaceous plants S 1.3 1 Plant cover of dense, rigid trees, shrubs, and herbaceous plants (can be added to figure above) S 4.1 1 Boundary of 150 ft buffer (can be added to another figure) S 2.1, S 5.1 1 1 km Polygon: Area that extends 1 km from entire wetland edge - including polygons for accessible habitat and undisturbed habitat H 2.1, H 2.2, H 2.3 3 Screen capture of map of 303(d) listed waters in basin (from Ecology website) S 3.1, S 3.2 4 Screen capture of list of TMDLs for WRIA in which unit is found (from web) S 3.3 5 Wetland Rating System for Western WA: 2014 Update Rating Form - Effective January 1, 2015 Wetland name or number: Wetland B HGM Classification of Wetlands in Western Washington For questions 1-7, the criteria described must apply to the entire unit being rated. If the hydrologic criteria listed in each question do not apply to the entire unit being rated, you probably have a unit with multiple HGM classes. In this case, identify which hydrologic criteria in questions 1-7 apply, and go to Question 8. 1. Are the water levels in the entire unit usually controlled by tides except during floods? ONO -goto2 ❑YES - the wetland class is Tidal Fringe - go to 1.1 1.1 Is the salinity of the water during periods of annual low flow below 0.5 ppt (parts per thousand)? NO - Saltwater Tidal Fringe (Estuarine) YES - Freshwater Tidal Fringe Ifyour wetland can be classified as a Freshwater Tidal Fringe use the forms for Riverine wetlands. If it is Saltwater Tidal Fringe it is an Estuarine wetland and is not scored. This method cannot be used to score functions for estuarine wetlands. 2. The entire wetland unit is flat and precipitation is the only source (>90%) of water to it. Groundwater and surface water runoff are NOT sources of water to the unit. ©NO - go to 3 ❑YES - The wetland class is Flats Ifyour wetland can be classified as a Flats wetland, use the form for Depressional wetlands 3. Does the entire wetland unit meet all of the following criteria? ❑ The vegetated part of the wetland is on the shores of a body of permanent open water (without any plants on the surface at any time of the year) at least 20 ac (8 ha) in size; ❑At least 30% of the open water area is deeper than 6.6 ft (2 m). ©NO-goto4 DYES - The wetland class is Lake Fringe (Lacustrine Fringe) 4. Does the entire wetland unit meet all of the following criteria? ©The wetland is on a slope (slope can be verygradual), ®The water flows through the wetland in one direction (unidirectional) and usually comes from seeps. It may flow subsurface, as sheetflow, or in a swale without distinct banks, ❑x The water leaves the wetland without being impounded. ❑NO-goto5 FAYES - The wetland class is Slope NOTE: Surface water does not pond in these type of wetlands except occasionally in very small and shallow depressions or behind hummocks (depressions are usually <3 ft diameter and less than 1 ft deep). S. Does the entire wetland unit meet all of the following criteria? ❑ The unit is in a valley, or stream channel, where it gets inundated by overbank flooding from that stream or river, ❑The overbank flooding occurs at least once every 2 years. Wetland Rating System for Western WA: 2014 Update Rating Form - Effective January 1, 2015 Wetland name or number: Wetland B ❑ NO -go to 6 DYES - The wetland class is Riverine NOTE: The Riverine unit can contain depressions that are filled with water when the river is not flooding 6. Is the entire wetland unit in a topographic depression in which water ponds, or is saturated to the surface, at sometime during the year? This means that any outlet, if present, is higher than the interior of the wetland. ONO -go to7 DYES - The wetland class is Depressional 7. Is the entire wetland unit located in a very flat area with no obvious depression and no overbank flooding? The unit does not pond surface water more than a few inches. The unit seems to be maintained by high groundwater in the area. The wetland may be ditched, but has no obvious natural outlet. ONO -goto8 DYES - The wetland class is Depressional 8. Your wetland unit seems to be difficult to classify and probably contains several different HGM classes. For example, seeps at the base of a slope may grade into a riverine floodplain, or a small stream within a Depressional wetland has a zone of flooding along its sides. GO BACK AND IDENTIFY WHICH OF THE HYDROLOGIC REGIMES DESCRIBED IN QUESTIONS 1-7 APPLY TO DIFFERENT AREAS IN THE UNIT (make a rough sketch to help you decide). Use the following table to identify the appropriate class to use for the rating system if you have several HGM classes present within the wetland unit being scored. NOTE: Use this table only if the class that is recommended in the second column represents 10% or more of the total area of the wetland unit being rated. If the area of the HGM class listed in column 2 is less than 10% of the unit; classify the wetland using the class that represents more than 90% of the total area. HGM classes within the wetland unit being rated HGM class to use in rating Slope + Riverine Riverine Slope + Depressional Depressional Slope + Lake Fringe Lake Fringe Depressional + Riverine along stream within boundary of depression Depressional Depressional + Lake Fringe Depressional Riverine + Lake Fringe Riverine Salt Water Tidal Fringe and any other class of freshwater wetland Treat as ESTUARINE Ifyou are still unable to determine which of the above criteria apply to your wetland, or ifyou have more than 2 HGM classes within a wetland boundary, classify the wetland as Depressional for the rating. Wetland Rating System for Western WA: 2014 Update 4 Rating Form - Effective January 1, 2015 Wetland name or number: Wetland B SLOPE WETLANDS Water Quality Functions - Indicators that the site functions to improve water quality S 1.0. Does the site have the potential to improve water quality? S 1.1. Characteristics of the average slope of the wetland: (a 1%slope has a 1 ft vertical drop in elevation for every 100 ft of horizontal distance) Slope is 1% or less points = 3 0 Slope is > 1%-2% points = 2 Slope is > 2%-5% points =1 Slope is greater than 5% points = 0 S 1.2. The soil 2 in below the surface or duff la er is true clay or true organic (use NRCS definitions): Yes = 3 No = 0 0 S 1.3. Characteristics of the plants in the wetland that trap sediments and pollutants: Choose the points appropriate for the description that best fits the plants in the wetland. Dense means you have trouble seeing the soil surface (>75% cover), and uncut means not grazed or mowed and plants are higher than 6 in. Dense,uncut, herbaceous plants >90%of the wetland area points =6 3 Dense, uncut, herbaceous plants > % of area points = 3 Dense, woody, plants > % of area points = 2 Dense, uncut, herbaceous plants > % of area points =1 Does not meet any of the criteria above for plants points = 0 Total for S 1 Add the points in the boxes above 3 Rating of Site Potential If score is: ❑12 = H ❑6-11= M 00-5 = L Record the rating on the first page S 2.0. Does the landscape have the potential to support the water quality function of the site? S 2.1. Is > 10% of the area within 150 ft on the uphill side of the wetland in land uses that generate pollutants? Yes=1 No= 0 1 S 2.2. Are there other sources of pollutants coming into the wetland that are not listed in question S 2.1? Othersources Yes =1 No = 0 0 Total for S 2 Add the points in the boxes above 1 Rating of Landscape Potential If score is: ®1-2 = M ❑0 = L Record the rating on the first page S 3.0. Is the water quality improvement provided by the site valuable to society? S 3.1. Does the wetland discharge directly (i.e., within 1 mi) to a stream, river, lake, or marine water that is on the 303(d) list? Yes =1 No = 0 0 S 3.2. Is the wetland in a basin or sub -basin where water quality is an issue? At least one aquatic resource in the basin is on the 303(d) list. Yes =1 No = 0 1 S 3.3. Has the site been identified in a watershed or local plan as important for maintaining water quality? Answer YES if there is a TMDL for the basin in which unit is found. Yes = 2 No = 0 0 Total for S 3 Add the points in the boxes above 1 Rating of Value If score is: ❑ 2-4 = H 91= M ❑0 = L Wetland Rating System for Western WA: 2014 Update Rating Form — Effective January 1, 2015 Record the rating on the first page 11 Wetland name or number: Wetland B SLOPE WETLANDS Hydrologic Functions, - Indicators that the site functions to reduce flooding and stream erasion S 4.0. Does the site have the potential to reduce flooding and stream erosion? S 4.1. Characteristics of plants that reduce the velocity of surface flows during storms: Choose the points appropriate for the description that best fits conditions in the wetland. Stems of plants should be thick enough (usually>1/88 in), or dense enough, to remain erect during surface flows. 0 Dense, uncut, rigid plants cover > 90% of the area of the wetland points =1 All other conditions points = 0 Rating of Site Potential If score is: ❑ 1= M 00 = L Record the rating on the first page S 5.0. Does the landscape have the potential to support the hydrologic functions of the site? S 5.1. Is more than 25% of the area within 150 ft upslope of wetland in land uses or cover that generate excess 1 surface runoff? Yes =1 No = 0 Rating of Landscape Potential If score is: 01= M 00 = L Record the rating on the first page S 6.0. Are the hydrologic functions provided by the site valuable to society? S 6.1. Distance to the nearest areas downstream that have flooding problems: The sub -basin immediately down -gradient of site has flooding problems that result in damage to human or natural resources (e.g., houses or salmon redds) points = 2 2 Surface flooding problems are in a sub -basin farther down -gradient points =1 No flooding problems anywhere downstream points = 0 S 6.2. Has the site been identified as important for flood storage or flood conveyance in a regional flood control plan? 0 Yes=2 No=O Total for S 6 Add the points in the boxes above 2 Rating of Value If score is: 02-4 = H ❑ 1= M ❑ 0 = L Record the rating on the first page NOTES and FIELD OBSERVATIONS: Wetland Rating System for Western WA: 2014 Update 12 Rating Form - Effective January 1, 2015 Wetland name or number: Wetland B These questions apply to wetlands of all HGM classes. HABITAT FUNCTIONS - Indicators that site functions to provide important habitat H 1.0. Does the site have the potential to provide habitat? H 1.1. Structure of plant community: Indicators are Cowardin classes and strata within the forested class. Check the Cowardin plant classes in the wetland. Up to 10 patches may be combined for each class to meet the threshold of'4 ac or more than 10% of the unit if it is smaller than 2.5 ac. Add the number of structures checked. ❑ Aquatic bed 4 structures or more: points = 4 ❑ Emergent 3 structures: points = 2 ❑ Scrub -shrub (areas where shrubs have > 30% cover) 2 structures: points =1 0 ® Forested (areas where trees have > 30% cover) 1 structure: points = 0 If the unit has a Forested class, check if.• ❑ The Forested class has 3 out of 5 strata (canopy, sub -canopy, shrubs, herbaceous, moss/ground-cover) that each cover 20%within the Forested polygon H 1.2. Hydroperiods Check the types of water regimes (hydroperiods) present within the wetland. The water regime has to cover more than 10% of the wetland or % ac to count (see text for descriptions of hydroperiods). ❑ Permanently flooded or inundated 4 or more types present: points = 3 ❑ Seasonally flooded or inundated 3 types present: points = 2 ® Occasionally flooded or inundated 2 types present: points =1 1 ® Saturated only 1 type present: points = 0 ❑ Permanently flowing stream or river in, or adjacent to, the wetland ❑ Seasonally flowing stream in, or adjacent to, the wetland ❑ Lake Fringe wetland 2 points ❑ Freshwater tidal wetland 2 points H 1.3. Richness of plant species Count the number of plant species in the wetland that cover at least 10 ft2. Different patches of the same species can be combined to meet the size threshold and you do not have to name the species. Do not include Eurasian milfoil, reed canarygrass, purple loosestrife, Canadian thistle 1 If you counted: > 19 species points = 2 5 -19 species points =1 < 5 species points = 0 H 1.4. Interspersion of habitats Decide from the diagrams below whether interspersion among Cowardin plants classes (described in H 1.1), or the classes and unvegetated areas (can include open water or mudflats) is high, moderate, low, or none. If you have four or more plant classes or three classes and open water, the rating is always high. 0 0 None = 0 points Low =1 point Moderate = 2 points All three diagrams *•• in this row are HIGH = 3points Wetland Rating System for Western WA: 2014 Update Rating Form — Effective January 1, 2015 13 Wetland name or number: Wetland B H 1.5. Special habitat features: Check the habitat features that are present in the wetland. The number of checks is the number of points. ® Large, downed, woody debris within the wetland (> 4 in diameter and 6 ft long). ❑ Standing snags (dbh > 4 in) within the wetland ❑ Undercut banks are present for at least 6.6 ft (2 m) and/or overhanging plants extends at least 3.3 ft (1 m) over a stream (or ditch) in, or contiguous with the wetland, for at least 33 ft (10 m) ❑ Stable steep banks of fine material that might be used by beaver or muskrat for denning (> 30 degree 2 slope) OR signs of recent beaver activity are present (cut shrubs or trees that have not yet weathered where wood is exposed) ❑ At least % ac of thin -stemmed persistent plants or woody branches are present in areas that are permanently or seasonally inundated (structures for egg -laying by amphibians) ® Invasive plants cover less than 25%of the wetland area in every stratum of plants (see H 1.1 for list of strata) I Total for H 1 Add the points in the boxes above I 4 I Rating of Site Potential If score is: ❑ 15-18 = H ❑7-14 = M 00-6 = L Record the rating on the first page H 2.0. Does the landscape have the potential to support the habitat functions of the site? H 2.1. Accessible habitat (include onlyhabitat thatdirectly abuts wetland unit). Calculate: % undisturbed habitat: 7 + [(% moderate and low intensity land uses)0/2]: 0 = 7% If total accessible habitat is: > 1/3 (33.3%) of 1 km Polygon points = 3 0 20-33% of 1 km Polygon points = 2 10-19% of 1 km Polygon points =1 < 10% of 1 km Polygon points = 0 H 2.2. Undisturbed habitat in 1 km Polygon around the wetland. Calculate: % undisturbed habitat: 7 + [(% moderate and low intensity land uses)24/2]:12 =19% Undisturbed habitat > 50% of Polygon points = 3 1 Undisturbed habitat 10-50% and in 1-3 patches points = 2 Undisturbed habitat 10-50% and > 3 patches points =1 Undisturbed habitat < 10% of 1 km Polygon points = 0 H 2.3. Land use intensity in 1 km Polygon: If > 50% of 1 km Polygon is high intensity land use points = (- 2) -2 <_ 50% of 1 km Polygon is high intensity points = 0 Total for H 2 Add the points in the boxes above -1 Rating of Landscape Potential If score is: 04-6 = H ❑1-3 = M ®< 1= L f H 3.0. Is the habitat provided by the site valuable to society? Record the rating on the first page H 3.1. Does the site provide habitat for species valued in laws, regulations, or policies? Choose only the highest score that applies to the wetland being rated. Site meets ANY of the following criteria: points = 2 ® It has 3 or more priority habitats within 100 m (see next page) ❑ It provides habitat for Threatened or Endangered species (any plant or animal on the state or federal lists) ❑ It is mapped as a location for an individual WDFW priority species ❑ It is a Wetland of High Conservation Value as determined by the Department of Natural Resources ❑ It has been categorized as an important habitat site in a local or regional comprehensive plan, in a Shoreline Master Plan, or in a watershed plan Site has 1 or 2 priority habitats (listed on next page) within 100 m points =1 Site does not meet any of the criteria above Rating of Value If score is: 92 = H ❑ 1= M ❑0 = L Wetland Rating System for Western WA: 2014 Update Rating Form - Effective January 1, 2015 2 Record the rating on the first page 14 Wetland name or number: Wetland B I WDFW Priority Habitats Priority habitats listed by WDFW (see complete descriptions of WDFW priority habitats, and the counties in which they can be found, in: Washington Department of Fish and Wildlife. 2008. Priority Habitat and Species List. Olympia, Washington. 177 pp. http: //wdfw.wa.,goy/publications/00165/wdfwQ0165.12df or access the listfrom here: bM2:./.Iwdfw.wa.gov/r,onservation/phs/list/) Count how many of the following priority habitats are within 330 ft (100 m) of the wetland unit: NOTE: This question is independent of the land use between the wetland unit and the priority habitat ❑ Aspen Stands: Pure or mixed stands of aspen greater than 1 ac (0.4 ha). ❑ Biodiversity Areas and Corridors: Areas of habitat that are relatively important to various species of native fish and wildlife (full descriptions in WDFWPHS report). ❑ Herbaceous Balds: Variable size patches of grass and (orbs on shallow soils over bedrock ❑ Old-growth/Mature forests: Old- owth west of Cascade crest -- Stands of at least 2 tree species, forming a multi- layered canopy with occasional small openings; with at least 8 trees/ac (20 trees/ha) > 32 in (81 cm) dbh or > 200 years of age. Mature forests - Stands with average diameters exceeding 21 in (53 cm) dbh; crown cover maybe less than 100%; decay, decadence, numbers of snags, and quantity of large downed material is generally less than that found in old -growth; 80-200 years old west of the Cascade crest. ❑ Oregon White Oak: Woodland stands of pure oak or oak/conifer associations where canopy coverage of the oak component is important (full descriptions in WDFW PHS report p.158 - see web link above). M Riparian: The area adjacent to aquatic systems with flowing water that contains elements of both aquatic and terrestrial ecosystems which mutually influence each other. ❑ Westside Prairies: Herbaceous, non -forested plant communities that can either take the form of a dry prairie or a wet prairie (full descriptions in WDFW PHS report p.161 -see web link above). ® Instream: The combination of physical, biological, and chemical processes and conditions that interact to provide functional life history requirements for instream fish and wildlife resources. ❑ Nearshore: Relatively undisturbed nearshore habitats. These include Coastal Nearshore, Open Coast Nearshore, and Puget Sound Nearshore. (full descriptions of habitats and the definition of relatively undisturbed are in WDFW report- see web link on previous page). ❑ Caves: A naturally occurring cavity, recess, void, or system of interconnected passages under the earth in soils, rock, ice, or other geological formations and is large enough to contain a human. ❑ Cliffs: Greater than 25 ft (7.6 m) high and occurring below 5000 ft elevation. ❑ Talus: Homogenous areas of rock rubble ranging in average size 0.5 - 6.5 ft (0.15 - 2.0 m), composed of basalt, andesite, and/or sedimentary rock, including riprap slides and mine tailings. Maybe associated with cliffs. ® Snags and Logs: Trees are considered snags if they are dead or dying and exhibit sufficient decay characteristics to enable cavity excavation/use by wildlife. Priority snags have a diameter at breast height of > 20 in (51 cm) in western Washington and are > 6.5 ft (2 m) in height. Priority logs are > 12 in (30 cm) in diameter at the largest end, and > 20 ft (6 m) long. Note: All vegetated wetlands are by definition a priority habitat but are not included in this list because they are addressed elsewhere. Wetland Rating System for Western WA: 2014 Update 15 Rating Form - Effective January 1, 2015 Wetland name or number: Wetland B CATEGORIZATION BASED ON SPECIAL. CHARACTERISTICS Wetland Type Category Owck off any criteria tl & apply to the wetland. Circle the category when the appropriate criteria om met. SC 1.0. Estuarine wetlands Does the wetland meet the following criteria for Estuarine wetlands? ❑ The dominant water regime is tidal, ❑ Vegetated, and ❑ With a salinity greater than 0.5 ppt ❑ Yes —Go to SC 1.1 ® No= Not an estuarine wetland SC 1.1. Is the wetland within a National Wildlife Refuge, National Park, National Estuary Reserve, Natural Area Preserve, State Park or Educational, Environmental, or Scientific Reserve designated under WAC 332-30-151? Cat. ❑Yes = CategoryI ❑ No - Go to SC 1.2 SC 1.2. Is the wetland unit at least 1 ac in size and meets at least two of the following three conditions? ❑ The wetland is relatively undisturbed (has no diking, ditching, filling, cultivation, grazing, and has Cat. less than 10% cover of non-native plant species. (If non-native species are Spartina, see page 25) ❑ At least % of the landward edge of the wetland has a 100 ft buffer of shrub, forest, or un-grazed or un- mowed grassland. Cat. II ❑ The wetland has at least two of the following features: tidal channels, depressions with open water, or contiguous freshwater wetlands. ❑Yes=Categoryl ❑No=Categoryll SC 2.0. Wetlands of High Conservation Value (WHCV) SC 2.1. Has the WA Department of Natural Resources updated their website to include the list of Wetlands of High Conservation Value? ❑Yes — Go to SC 2.2 ®No — Go to SC 2.3 SC 2.2. Is the wetland listed on the WDNR database as a Wetland of High Conservation Value? ❑Yes = CategoryI ®No = Not a WHCV SC 2.3. Is the wetland in a Section/Township/Range that contains a Natural Heritage wetland? Cat. http://wwwl.dnr.wa.gov/nhp/refdesk/datasearch/wnhowetiands.pdf ❑Yes — Contact WNHP/WDNR and go to SC 2.4 ❑ No = Not a WHCV SC 2.4. Has WDNR identified the wetland within the S/T/R as a Wetland of High Conservation Value and listed it on their website? ❑Yes = CategoryI ❑ No = Not a WHCV SC 3.0. Bogs Does the wetland (or any part of the unit) meet both the criteria for soils and vegetation in bogs? Use the key below. If you answer YES you will still need to rate the wetland based on its functions. SC 3.1. Does an area within the wetland unit have organic soil horizons, either peats or mucks, that compose 16 in or more of the first 32 in of the soil profile? ❑Yes — Go to SC 3.3 ❑ No — Go to SC 3.2 SC 3.2. Does an area within the wetland unit have organic soils, either peats or mucks, that are less than 16 in deep over bedrock, or an impermeable hardpan such as clay or volcanic ash, or that are floating on top of a lake or pond? ❑Yes — Go to SC 3.3 ❑ No = is not a bog SC 3.3. Does an area with peats or mucks have more than 70% cover of mosses at ground level, AND at least a 30% Cat. I cover of plant species listed in Table 4? Dyes = Is a Category I bog ❑ No — Go to SC 3.4 NOTE: If you are uncertain about the extent of mosses in the understory, you may substitute that criterion by measuring the pH of the water that seeps into a hole dug at least 16 in deep. If the pH is less than 5.0 and the plant species in Table 4 are present, the wetland is a bog. SC 3.4. Is an area with peats or mucks forested (> 30% cover) with Sitka spruce, subalpine fir, western red cedar, western hemlock, lodgepole pine, quaking aspen, Engelmann spruce, or western white pine, AND any of the species (or combination of species) listed in Table 4 provide more than 30% of the cover under the canopy? OYes=IsaCategoEyIbog ❑No=lsnotabo Wetland Rating System for Western WA: 2014 Update 16 Rating Form — Effective January 1, 2015 Wetland name or number: Wetland B SC 4.0. Forested Wetlands Does the wetland have at least 1 contiguous acre of forest that meets one of these criteria for the WA Department of Fish and Wildlife's forests as priority habitats? If you answer YES you will still need to rate the wetland based on its functions. ❑ Old -growth forests (west of Cascade crest): Stands of at least two tree species, forming a multi -layered canopy with occasional small openings; with at least 8 trees/ac (20 trees/ha) that are at least 200 years of Cat. age OR have a diameter at breast height (dbh) of 32 in (81 cm) or more. ❑ Mature forests (west of the Cascade Crest): Stands where the largest trees are 80- 200 years old OR the species that make up the canopy have an average diameter (dbh) exceeding 21 in (53 cm). ❑Yes = Category I N No = Not a forested wetland for this section SC 5.0. Wetlands in Coastal Lagoons Does the wetland meet all of the following criteria of a wetland in a coastal lagoon? ❑ The wetland lies in a depression adjacent to marine waters that is wholly or partially separated from marine waters by sandbanks, gravel banks, shingle, or, less frequently, rocks ❑ The lagoon in which the wetland is located contains ponded water that is saline or brackish (> 0.5 ppt) during most of the year in at least a portion of the lagoon (needs to be measured near the Cat. I bottom) ❑Yes — Go to SC 5.1 N No = Not a wetland in a coastal lagoon SC 5.1. Does the wetland meet all of the following three conditions? ❑ The wetland is relatively undisturbed (has no diking, ditching, filling, cultivation, grazing), and has Cat. II less than 20% cover of aggressive, opportunistic plant species (see list of species on p.100). ❑ At least % of the landward edge of the wetland has a 100 ft buffer of shrub, forest, or un-grazed or un- mowed grassland. ❑ The wetland is larger than 1/io ac (4350 ftZ) ❑ Yes = CategoryI ❑ No = Categoryll SC 6.0. Interdunal Wetlands Is the wetland west of the 1889 line (also called the Western Boundary of Upland Ownership or WBUO)? If you answer yes you will still need to rate the wetland based on its habitat functions. Cat I In practical terms that means the following geographic areas: ❑ Long Beach Peninsula: Lands west of SR 103 ❑ Grayland-Westport: Lands west of SR 105 ❑ Ocean Shores-Copalis: Lands west of SR 115 and SR 109 Cat.11 ❑Yes — Go to SC 6.1 N No = not an interdunal wetland for rating SC 6.1. Is the wetland 1 ac or larger and scores an 8 or 9 for the habitat functions on the form (rates H,H,H or H,H,M Cat. III for the three aspects of function)? ❑Yes = CategoryI ❑ No — Go to SC 6.2 SC 6.2. Is the wetland 1 ac or larger, or is it in a mosaic of wetlands that is 1 ac or larger? ❑Yes = Category II ❑ No — Go to SC 6.3 Cat. IV SC 6.3. Is the unit between 0.1 and 1 ac, or is it in a mosaic of wetlands that is between 0.1 and 1 ac? ❑Yes = Category III ❑ No = CategoryIV Category of wetland based on Special Characteristics NA If you answered No for all types, enter "Not Applicable" on Summary Form Wetland Rating System for Western WA: 2014 Update 17 Rating Form — Effective January 1, 2015 Wetland name or number This page left blank intentionally Wetland Rating System for Western WA: 2014 Update 18 Rating Form - Effective January 1, 2015 4 .,Sir r'} !`� SF7;$3:� S.L. �� ■ - �. R �u�o •as2n���+ S Both 5t _ r f gyp'. - . i;' • SLo �� Y,4` r y+° cs. • Y i y al •� �4 lrar i t.I1�L`4v + Ir • ;A• 1 aJ j L fr 3 - � .�� � [ .. 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S 304th 3t - y'S305th�St n a V• s- 1h St $yy 308th St 2` Q I `° T I�- T S 3981h �� Po � p4 St N y ID a m D If d Q a — c N - _ 3W 3121h St Syy3121h St- - 5 312lh St --i—�. — _— N_ ry r S-314th St Park � Figure 5: 53.3 WATER QUALITY IMPROVEMENT PROJECTS (TMDLs) Overview of the process Project Catalog by WRIA by county Funding Opportunities Project Development Priority Lists Related Information TMDL Contacts RELATED ECOLOGY PROGRAMS Water Quality Water Duality Imorovement - Water uaii(- Im rovernent protects b V'1R A = WRI.^-. 5: Du%-,ami=h-Green WRIA 9: Duwamish-Green c ea ,t. ones The following table lists overview information for water quality improvement - 21 projects (including total maximum daily loads, or TMDLs) for this water resource inventory area (WRIA). Please use links (where available) for more 'e ` w, 1 information on a project. 0z Counties • K-ng r L ritrcc Waterbody Name Pollutants status** TMDL Lead Duwamish and Lower Ammonia-N Approved by EPA Joan Nolan Green River 425-649-4425 Fauntleroy Creek Fecal Coliform Approved by EPA Joan Nolan Has an implementation 425-649-4425 plan Fenwick Lake Total Phosphorus Approved by EPA (1993, Tricia Shoblom 425-649-7288 Clean Lakes Program) Category 5, 2006 Water Quality Assessment Green River and Temperature Green River TMDL Joan Nolan Newaukum Creek Dissolved Oxygen Approved by EPA 425-649-4425 Newaukum Creek TMDL Approved by EPA Has an implementation plan Sawyer Total Phosphorus .-Lake Approved by EPA Tricia Shoblom 425-649-7288 Has an implementation plan Soos Creek Fecal Coliform Under development Dave Garland 425-649-7031 Aquatic Habitat Joan Nolan Dissolved Oxygen 425-649-4425 Temperature ** Status will be listed as one of the following: Approved by EPA, under Development or Implementation For more information about WRIA 9: • Waterbodies in WRIA 9 - using the Water Quality Assessment Query Tool • Watershed Information for WRIA 9 * The Department of Ecology and other state resource agencies frequently use a system of 62 "Water Resource Inventory Areas" or "WRIAs" to refer to the state's major watershed basins. Section 5, Township 21, Range 4 W.M. COLD CREEK SANITARY SEWER TRUNK LINE OWNER LAKEHAVEN UTILITY DISTRICT 31627 1ST AVE S FEDERAL WAY, WA 98003 (253) 941-1516 GEOTECHNICAL ENGINEER ROBINSON—NOBLE 2105 SOUTH C ST TACOMA, WA 98402 PH: (253) 475-7711 CONTACT: RICK B. POWELL CIVIL ENGINEER LPD ENGINEERING, PLLC 911 WESTERN AVE, SUITE 420 SEATTLE, WA 98104 PH. (206) 725-1211 FAX. {206] 973-5344 CONTACT! IAARC SERIRZI ENVIRONMENTAL CONSULTANT THE WATERSHED COMPANY 750 SIXTH ST SOUTH KIRK LAND, WA 98033 (425) 822-5242 CONTACT: GREG JOHNSTON SURVEYOR TETRA TECH 400 112TH AVE NE, SUITE 300 BELLEVUE, WA 98004 (425) 635-1000 CONTACT: (OFFICE CLOSED) CROSSING PROJECT FOR LAKEHAVEN UTILITY DISTRICT FEDERAL WAY, WA 98003 LAKEHAVEN UTILITY DISTRICT VERTICAL DATUM SANITARY SE AFt 31627 1ST AVE S FEDERAL WAY, WA 98003 (253) 941-1516 HORIZONTAL DATUM HORIZONTAL DATUM: ASSUMED CONTROL PROVIDED BY THE LAKEHAVEN WATER AND SEWER DISTRICT FOR REDONDO—WWTP RETAINING WALL MONITORING PROGRAM. CONTROL METHOD: ADDITIONAL HORIZONTAL AND VERTICAL CONTROL COORDINATES WERE DERIVED USING TRIGONOMETRIC TRAVERSE METHODS USING A LEICA TPS-1201 TOTAL STATION. PUGET SOUND �2 ,o CPC; Gq 0 SW 5 296TH t 1 � 3- LOCATION MAP SCALE: 1 "= 800' 1 SITE/PROJE SITE/PROJECT AREA G Ih N b( ALL: 1 =1 MILL SHEET NO SHEET TITLE C1.0 COVER C2.0 DEMO & TESC C3.0 DETAILS & NOTES C4.0 SITE & GRADING C5.0 PROFILE & SECTIONS C6.0 DETAILS & NOTES W1 EXISTING CONDITIONS W2 GRADING PLAN W3 LARGE WOODY DEBRIS PLACEMENT PLAN W4 STREAM CHANNEL CROSS AND LONGITUDINAL SECTION 911 Whir SIL04111. mmm Sek11e, W p. 206,7.2: I, 2mgn engineering pIIC—.Ipdeni stamp e eW.ItP�. F1�kM1iL k„R. . Z-23! Na P4y Two Inches At Full Scale II Not Scole Accordingly 13e V w w 3 O V LU Cie QZ t= U5 F— ZN QO� N Ii Z �V LU w wLU Q Oe Z VJ w � Q i J J Z OD V � Project No 279-15-01 Issue Date 2/23/16 Scale As Noted Designed M]S Checked 1 De.. SN Approved ( COVER a .S&Oaucx_rYru list. 3l F IF �npilY�'1TFr E L FE{N:•'fG] �rJr:B�+II.Tt_- 5Tl.�'Lry-'r9.EG' r 4YiJ'SVSSRRarAM. •r'.. ~ f r • aese w 6� a•fjFH f CA4AMr/�ptl,T { r �sill I •wait 2-Ill sC•r r LNY,TRl I¢l WALL •, Section 5, Township 21, Range 4 W.M. APPROXIMATE NORTH Scale 1r=20' `. LeIE LacATIONs I HEn'CH DRAUJ CO GUN. UGTED%I '!?N I TI- • ISE FI�E CIl i lit C, JN _ Ler.'._.TFI\',icr N'.1 i1_ITr ET F--. '.NC / ''�)/-/i t�AYEflrsS�f�e tl,�. \ 'A 1LEGEND �•�:� A7 i i.: i1 ti - — FA[Y iG 4 i14�N rF :p;a? -.Yl.,.,rF£e1'nair arAW as u. , .�ynsatlx.0 ' M1`_ 'Ar��, F. ..:^•' _ J - _ .. ` ` _ - � .� ._ _� � _ -c . PROPERTY LINE yf TEMPORARY WETLAND EX CONTOUR (INDEX) 11E3fiA MY'�:A: TEMPORIll ROADWAY ACCESS SILT a SS rrcoItm icTprx2 _, I - r '. - _ a •.. 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TRENCH 8O% To Elf SSAIH •ok�w'CL . r . yr` _ `I^'iI 1r-` ., — � WETLAND AV A27tin ~ A A]5 � � '''- ----♦ -UPSTREAM SAND'SAC AND PLASTIC COFFER DAY .-ry `_ ` - _ Y Y` . �;• �ATra•�'+•q - _ -. -E CONSTRllCTtON SEQUENCE NOTES. MEET C6.0 r F0� °��"[T 4o.:RTeuor. W'�c.`!?=-t. _ �. 7ai a^'tea,.►tins(a¢9-au `IHTAHE, SEE CONSTR}1CTIOH SEQUENCE NOTES 26 SHEET C6.0_ L1�`1 % , _ _ '•`. • . 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FORCE MAN - -r �. � •_ � . f ' � 1 `- LIYRS OF h40R1[ OW) ctR�x"canC•,ws rCr �'ry�'o-l�'F��J 6 f � � � � - J� , .� d• ) rr.. � �`� [1'AtLFC'ICMC•!1> r RE610V`c AND DISPOSE :1 •} f r (tcdo!P w.v \ OF EX DESR15 +'� :r. - �r col J �Pla� lam=, 1- ■Tys:er cmtsts+NEure,s4crrenwaly •!'75 A!@SECrr7Ci5�C'C+iP � a�` '. 4 RyH6R AtQ CJI L:k iY7H1�5bE?bM1'h1E �-i � � GEFSsga[gr �vl - � F � I I war roll L! a? T r l5oofl I M+rornrEA z • sstr•o �La I ��, MIIDR14}T/p: / n o.cwnwus J Fop or1.-6?-w, oi�tisunw rr (�s�cr r � 4F0�''iq� �Y)G6F�, CaxMifi3 UMW 911 Vlests 5u to 420, Seattle, W I. 206.72`. t. 206.973 engineering PlIC —Ipdem —p � • SE• ¢4 � rnvk�9G 4 ~ t �InA7tisL,.'•'•'a Z-Z3! Nn Rdr.'x: o I• Twc Inches At Full Scola I( Not Scale Accordingly Cie V Uj Uj O W ey • ) ^L� Ce V V,^J <0 V) LT se V w w Cie V J J Z O V Ce Project No 279_15-01 lo— Date 2/23/16 Sc'le As Noted Designed NITS Checked 1 Drawn SN Approved Description DEMO & TESC eee�ea ro...ak o,",�,Fw<u�6,o wrwhlm lr e e"`eihl:a.'•"'a`n�rwio*rrw.e wla•.... »rtw��h�hsx, we^1a�xaxw Kww"�n"m �n.I.aiw.Nll.xxw.wl..>.hl.�� N�ntnen xawawMnwe a nlFaxlMwalw N�Fzrw u n Inlnlwlwe lex¢s1xwA lcxxassnawxta.xA• ,•,� .oe ..m..ow ST DANDDPP RI.1, _E"I SILT FENCE 4 rr. NTS SILT FENCE SILT FENCE f NOTES NTS SILT FENCE NOTES 2 ll a Fuel tier MnK saox E.. Na ae: The reguimmonlb aprova Iho ozktng access roadway M.depend an 0w weamer candifl— during cunsW Non Miret 50OX shall be placed on the exlebag subgaade and the ends wrapped as 1Nowh to —A w"h9p 9M The thickness of the hog luel shell be between 1 1. 2 feel. end wiil depart on the—sthadion usability Roe,eisory xo Tempo27 Roadway Avxss Sepion laxena,w YYp i+YMe Afmsea T,pr�ht P>wlGido�a liw anars FEDERAL WAY GENERAL NOTES TEMPORARY ROADWAY ACCESS SECTION 3 1. ALL CONSTRUCTION SHALL BE IN ACCORDANCE WITH THE FEDERAL WAY REVISED CODE (FWRC), APPLICABLE ORDINANCES, AND THE CITY COUNCIL CONDITIONS OF PROJECT APPROVAL THESE DOCUMENTS ARE SUPPLEMENTED BY THE STANDARD SPECIFICATIONS FOR ROAD, BRIDGE, AND MUNICIPAL CONSTRUCTION (WSDOT/APWA), THE KING COUNTY ROAD STANDARDS (KCRS), AND THE KING COUNTY SURFACE WATER DESIGN MANUAL (KCSWDM),IT SHALL BE THE SOLE RESPONSIBILITY OF THE APPLICANT AND THE PROFESSIONAL ENGINEER TO CORRECT ANY ERROR, OMISSION. OR VARIATION FROM THE ABOVE REQUIREMENTS FOUND IN THESE PLANS. ALL CORRECTIONS SHALL BE AT NO ADDITIONAL COST OR LIABILITY TO THE CITY OF FEDERAL WAY. 2. THE DESIGN ELEMENTS WITHIN THESE PLANS HAVE BEEN RENEWED ACCOROING TO THE FEDERAL WAY ENGINEERING RENEW CHECKLIST, SOME ELEMENTS MAY HAVE BEEN OVERLOOKED OR MISSED BY THE CRY ENGINEERING PLAN REVIEWER. ANY VARIANCE FROM ADOPTED STANDARDS rS NOT ALLOWED UNLESS SPECIFICALLY APPROVED BY THE CITY OF FEDERAL WAY, PRIOR TO CONSTRUCTION. 3. APPROVAL OF THIS ROAD, GRADING, AND DRAINAGE PLAN DOES NOT CONSTITUTE AN APPROVAL OF ANY OTHER CONSTRUCTION (LE. DOMESTIC WATER CONVEYANCE, SEWER CONVEYANCE, GAS, ELECTRICITY, ETC.) 4. BEFORE ANY CONSTRUCTION OR DEVELOPMENT ACTMTY, A PRECONSTRUCTION MEETING MUST BE HELD BETWEEN THE CITY OF FEDERAL WAY. THE APPLICANT, AND THE APPLICANT'S CONSTRUCnON REPRESENTATIVE. 5. A SIGNED COPY OF THESE APPROVED PLANS MUST BE ON THE JOB SITE WHENEVER CONSTRUCTION IS IN PROGRESS. 6. CONSTRUCTION NOISE SHALL BE LIMITED AS PER FWRC (SECTION 19.105.040); NORMALLY THIS IS 7:00 A.M. TO 8:00 P.M., MONDAY THROUGH FRIDAY, AND 9:00 A.M. TO 8:00 P.M. ON SATURDAYS. 7. IT SHALL BE THE APPLICANT'S/CONTRACTOR'S RESPONSIBILITY TO OBTAIN ALL CONSTRUCTION EASEMENTS NECESSARY BEFORE INITIATING OFF —SITE WORK WITHIN THE ROAD RIGHT—OF—WAY. 8. FRANCHISED UTILITIES OF OTHER INSTALLATIONS THAT ARE NOT SHOWN ON THESE APPROVED PLANS SHALL NOT BE CONSTRUCTED UNLESS AN APPROVED $ET OF PLANS TRAT MEET ALL CITY REOUIREIAENTS AND THE REQUIREMENTS OF Km CHAPTER 8 ARE SUBMITTED TO THE CITY OF FEDERAL WAY AT LEAST THREE DAYS PRIOR TO CONSTRUCTION. 9. VERTICAL DATUM SHALL BE KCAS OR NGVD-29. 10.13ROUNDWATER SYSTEM CONSTRUCTION SHALL BE WITHIN A RKM—OF—WAY OR APPROPRIATE DRAINAGE EASEMENTS, BUT NOT UNDERNEATH THE ROADWAY SECTION. ALL GROUNDWATER SYSTEMS MUST BE CONSTRUCTED IN ACCORDANCE WITH THE WSDOT/APWA STANDARD SPECIFICATIONS. 11.ALL UTR.ITY TRENCHES IN THE RIGHT-OF-WAY SHALL BE BACKFILLED 5/8" CRUSHED ROCK AND COMPACTED TO 95% DENSITY. WHEN TRENCH WIDTH IS 18 INCHES OR LESS, AND IS WITHIN THE TRAVELED WAY. TRENCH WILL BE BmxnLLED WITH CONTROL uNSTTY FILL (SELF -COMPACTED FLOWABLE FILL) AS DEFINED BY WASHINGTON AGGREGATES AND CONCRETE ASSOCIATION. THE AGGREGATE WILL BE 3/8-INCH MINUS. 12.ALL ROADWAY SUBGRADE SHALL BE BACKFILLED AND COMPACTED TO 95% DENSITY IN ACCORDANCE WITH WSDOT 2-06.3. 13.OPEN CUTTING OF EXISTING ROADWAYS IS NOT ALLOWED UNLESS SPECIFICALLY APPROVED BY THE PUBLIC WORKS DIRECTOR AND NOTED ON THESE APPROVED PLANS. ANY OPEN CUT SHALL BE RESTORED IN ACCORDANCE WITH KCRS 8.03(8) 3. 14.THE CONTRACTOR SHALL BE RESPONSIBLE FOR PROVIDING ADEQUATE SAFEGUARDS, SAFETY OEVICES, PROT'ECTWE EOIIIPMENT, FlAGGERS, AND ANY OTHER NEEDED ACTIONS TO PROTECT LIFE, HEALTH, AND SAFETY OF THE PUBLIC, AND TO PROTECT PROPERTY IN CONNECTION WITH THE PERFORMANCE OF WORK COVERED BY THE CONTRACTOR. ANY WORK WITHIN THE TRAVELED RIGHT-OF-WAY THAT WAY INTERRUPT NORMAL TRAFFIC FLOW SHALL REQUIRE AT LEAST ONE FLAGGER FOR EACH LANE OF TRAFFIC AFFECTED. ALL SECTIONS OF THE WSDOT STANDARD SPECIFICATIONS 1-07.23—TRAFFIC CONTROL, SHALL APPLY. 15.CONTRACTOR SHALL PROVIDE AND INSTALL ALL REGULATORY AND WARNING SIGNS PER THE LATEST EDITION OF MANUAL ON UNIFORM TRAFFIC CONTROL DEVICES. FEDERAL WAY ESC NOTES 1, APPROVAL OF THIS EROSION/SEDIMENTATION CONTROL (ESC) PLAN DOES NOT CONSTITUTE AN APPROVAL OF PERMANENT ROAD OR DRAINACE DESIGN (LE. SIZE AND LOCATION OF ROADS. PIPES, RESTRICTORS, CHANNELS, RETENTION FACILITIES, UTILITIES. ETC.), 2. THE IMPLEMENTATION OF THESE ESC PLANS AND THE CONSTRUCTION, MAINTENANCE. REPLACEMENT, AND UPGRADING OF THESE ESC FACILITIES IS THE RESPONSIBILITY OF THE APPLICANT/CONTRACTOR UNTIL ALL CONSTRUCTION IS APPROVED. 3. THE BOUNDARIES OF THE CLEARING LIMITS SHOWN ON THIS PLM STALL BE CLEARLY FLAGGED IN THE FIELD PRIOR TO CONSTRUCTION. DURING THE CONSTRUCTION PERIOD. NO DISTURBANCE BEYOND THE FLAGGED CLEWING LIMITS SHALL BE PERMITTED. THE FLAGGING SHALL BE MAINTAINED BY THE APPLICANT/CONTRACTOR FOR THE DURATION OF CONSTRUCTION. 4. THE ESC FACILITIES SHOWN ON THIS PLAN MUST BE CONSTRUCTED IN CONJUNCTION WITH ALL CLEARING AND GRADING ACTNMES, AND IN SUCH A MANNER AS TO INSURE THAT SEDIMENT LADEN WATER DOES NOT ENTER THE ➢FWNAGE SYSTEM OR VIOLATE APPLICABLE WATER STANDARDS. 5. THE ESC FACILITIES SHOWN ON THIS PLAN ARE THE MINIMUM REQUIREMENTS FOR ANTICIPATED SITE CONDITIONS. DURING THE CONSTRUCTION PERIOD, THESE ESC FACILTWES SHAu BE UPGRADED {I.E. ADDITIONAL SUMPS. RELOCATION OF OITCHES AND SILT FENCES, ETC_) AS NEEDED FOR UNMCTED STORM EVENTS. 6. THE ESC FACILTIES SNAIL BE INSPECTED DAILY BY THE APPUMff/CONTRACTOR AND MAINTAINED AS NECESSARY TO ENSURE THEIR CONTINUED FUNCTIONING. 7, ANY AREA STRIPPED OF VEGETATION, INCLUDING ROADWAY EMBANKMENTS. WHERE NO FURTHER WORK IS ANTICIPATED OR A PERIOD OF 15 DAYS, SHALL BE IMMEDIATELY STABIUZED WITH THE APPROVED ESC MEmos (IC SEEDING, MULCHING, NETTING. ERQ9OH BLANKETS. ETC,) B. ANY AREA NEEDING ESC MEASURES, NOT REQUIRING IMMEDIATE ATTENTION, SHALL BE ADDRESSED WITHIN 15 DAYS. 9. THE ESC FACILITIES ON INACTIVE SrTES SHALL BE INSPECTED AND MAINTAINED A MINIMUM OF ONCE A MONTH OR WITHIN THE 48 HOURS FOLLOWING A STORM EVENT. 10.AT NO TIME SHALL MORE THAN ONE FOOT OF SEDIMENT BE ALLOWED TO ACCUMULATE WG}HN A CATCH BA51N. ALL CATCH BASINS AND CONVEYANCE LINES SHALL BE CLEANED PRIOR TO PAVING. THE CLEANING OPERATION SHALL NOT FLUSH SMIWVNT-LADEN WATER INTO THE DOWNSTREAM SYSTEM, 11.STABILIZED CONSTRUCTION ENTRANCES AND WASH PADS SHALL BE INSTALLED AT THE BEGINNING OF CONSTRUCTION AND MAINTAINED FOR THE DURATION OF THE PROJECT. AMTONAL MEASURES MAY BE REQUIRED TO INSURE THAT ALL PAVED AREAS ARE KEPT CLEAN FOR THE DURATION OF THE PROJECT, 12.WET SEASON REQUIREMENTS AS DESCRIBED IN APPENDIX D, SECTION D.5.2 OF THE KCSWOM ARE IN EFFECT BEGINNING OCTOBER 1 THROUGH APRIL 30. 13.ANY PERMANENT RETENTION/DETENTION FACUTY USED AS A TEMPORARY SETTLING RASIN SHALL RE MODIFIED WITH THE NECESSARY EROSION CONTROL MEASURES AND SHALL PROVIDE ADEQUATE STORAGE CAPACITY. IF THE PERMANENT FACILITY IS TQ FUNCTION ULTIMATELY AS AN INFILTRATION OR DISPERSION SYSTEM. THE FACILITY SMALL NX 13E USED AS A TEMPORARY SETTLING BASIN. NO UNDERGROUND DETENTION TANKS OR VAULTS SHALL BE USED AS A TEMPORARY SETTING BASIN. 14.WHERE SEEDING FOR TEMPORARY EROSION CONTROL IS REQUIRED, FAST GERMINATING GRASSES SHALL BE APPLIED AT AN APPROPRIATE RATE (I.E. ANNUAL OR PERENNX RYE APPLIED AT APPROXIMATELY 90 POUNDS PER ACRE). KTS NOT USED C E u SO W" sN 1F420. Imm Smie, W P, i06.7m (, 2p6.973 engineering pllc www•Ipdenl Stamp SE SAL ti.: G�• 2-23 i No R.As 0 t' Tea Inches A[ Full Scale If Not Scale Accordingly Prajecl Nome H � V Lu Lu �: i Lu Cie O V) 0— O V az_ z (n �a 0 Li 00 LU LV LLJ Ce V J J z 0::) V � Praise' Na 279.15.01 Issue Date 2/23/16 Scale As Noted Designed MIS Checked k Draen SN Approved 1 Description DETAILS & NOTES 1r Al l IITII ITIFS SHAII RF AD, II ISTFD TO FINAI GRAOF AFTFR PAVINr, ASPHAIT WFARING COI IRCF Section 5, Township 21, Range 4 W.M. 20. 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FINISHED GRADE AT C/L-'. OF EX SS PIPE f—=1 BACKFILL PER SECTION. csy 1 r INSTALL RISERS C/L COLDCREEK J TO EX GRADE EX GRADE AT C/L OF / EX SS PIPE f ffTEMPORARY EXCAVATION J WIT}{ TRENCH BOX _ / g5 . 8 PIN PILES PER LOCATION TO BE ]II DETERMINED IN THE + O FIELD BY LUD REPRESENTATIVE -------� e•, ne CIP SS PROTECT EX 8" DIP SS .. 4 le 2" PIN PILES DRIVEN TO REFUSAL SUPPORT BRACKET (CRADLE) DESIGN BY CONTRACTOR (TYP OF 6) 101+00 24MIN COVER 18"0 MAX ROUND ROCKS SEE GEOTECHNICAL REPORT — — — — — i i EX GRADE -,• '''f ` �• `� ` PROTECT EX 18" � � lHDPE/CMP SD AND INSTALL PIPE ANCHORS PER \2' TO 8" QUARRY ROCK WSDOT STD SPEC 9-13.6 � 10 0 5 to 7n w 40 101+90 Scale 1"=10' H 1"=10' V /S NOTM 4TH AVE RAVINE PROFILE EX 1B" CMP/CORRUGATED HOPE NOTES: BOLTED PIPE CLAMP HICK X 3/4" MIN WIDE 10R BETWEEN )NS (TYP) `EX GRADE A —RAY ANCHORS 911 WeStE Suite 420, 1 M Seattle, W p. 206.72! f. 206.973 engineering PIIC w ,lPdea, Slamp �SF9 4 = ly 4 $ n'r GWA� V4 Hlyxt k�'�. 2-7-3-1 t.a Ren 0 1' Two Inches At Full Scale If Not Scale Accordingly -roject Name Cie V Lu w 3: � V Lu 0— Cie V 0 Q z ZN a0� (/) c e. Z se > WWCie Q VJ LU SIR Q J J Z OD V F_ Project No 279-15-01 Ioaae Data 2/23/16 Scala As Noted Designed Mis Checked 1 Drawn SN Approved Deeril PROFILE 8 SECTION." C d.1 E V PLACE LARGE BCUt IMMEDIATELY DOWN`. OF PIPE CROSSING 24" MIN COVER (BOULDER MIX) SEE SHEET W4 FOR DETAIL SEE GEOTECHNICAL REPORT DO NOT DROP OR PLACE LARGE BOULDERS DIRECTLY ON TOP OF PIPE EX TREE/ROCK/GRAVEL COVER 12"f L -7 ORIGINAL GRADE (PRIOR TO OCT 2015) � J ' �EX 24" CIP 55 1" ORIGINAL THICKNESS 0.7" CURRENT THICKNESS NOTE: 1. APPLIES TO CURRENT CONDITIONS, WITH THE EX SS PIPE BURIED" COLD CREEK SEWER PIPE CROSSING DETAIL (OPTION A) 1 FEDERAL WAY DRAINAGE NOTES 1, PROOF OF LIABILITY INSURANCE SHALL BE SUBMITTED TO THE CITY PRIOR TO THE PRECONSTRUCTION MEETING. 2. ALL PIPE AND APPURTENANCES SHALL BE LAID ON A PROPERLY PREPARED FOUNDATION IN ACCORDANCE WITH WSDOT 7-02.3(I). THIS SHALL INCLUDE LEVELING AND COMPACTING THE TRENCH BOTTOM. THE TOP OF FOUNDATION MATERIAL, AND REQUIRED PIPE BEDDING, TO A UNIFORM GRADE SO THAT THE ENTIRE PIPE IS SUPPORTED BY A UNIFORMLY DENSE UNYIELDING BASE. 3. STEEL PIPE SHALL BE GALVANIZED AND HAVE ASPHALT TREATMENT #1 OR BETTER INSIDE AND OUTSIDE. 4. ALL DRAINAGE STRUCTURES. SUCH AS CATCH BASINS AND MANHOLES, NOT LOCATED WITHIN A TRAVELED ROADWAY OR SIDEWALK SHALL. HAVE SOLID LOCKING UDS. ALL ORANAOE STRUCTURES ASSOCIATED WITH A PERMANENT RETENTION/DETENTION FACILITY SHALL HAVE SOLID LOCKING LIDS 5, ALL CATCH BASIN GRATES SHALL CONFORM TO CFW DRAWING NUMBERS 4-1, 4-2. 4-3. 4-4 OR 4-5, 6. ALL DRIVEWAY CULVERTS LOCATE] WITHIN THE RIGHT-OF-WAY SHALL BE OF SUFFICIENT LENGTH TO PROVIDE A MINIMUM 3:1 SLOPE FROM THE EDGE OF THE DRIVEWAY TO THE BOTTOM OF THE DITCH. CULVERTS SHALL HAVE BEVELED END SECTIONS TO MATCH THE SIDE SLOPES. 7, ROCK FOR EROSION PROTECRON OF DITCHES, CHANNELS AND SWALES. WHERE REQUIRED. MUSK BE OF SOUND QUARRY ROCH, PLACED TO A DEPTH OF ONE FOOT AND MUST MEET THE FOLLONRNC SPECIFICATONS: 4"--8• ROCK/40%-70% PASSING; 2•-4" ROCK/30%-40% PASSING; AND -2" ROCK/NOR-20% PASSING. INSTALLATION SHALL BE IN ACCORDANCE WITH KCRS DRAWING NUMBER 51 OR AS AMENDED BY THE APPROVED PLANS. RECYCLED ASPHALT OR CONCRETE RUBBLE SHALL NOT BE USED. B. LOTS NOT APPROVED FOR INFILTRATION SHALL BE PROVIDED WITH DRAINAGE OUTLETS (STUB -OUTS). STUB -OUTS SHALL CONFORM TO THE FOLLOWING: A EACH OUTLET SHALL BE SUITABLY LOCATED AT THE LOWEST ELEVATION ON THE LOT, 50 AS TO SERVICE ALL FUTURE ROOF DOWNSPOUTS AND FOOTING ORNNS, ORNEWAYS, YARD DRAINS, AND ANY OTHER SURFACE OR SU8-- SURFACE DRAINS NECESSARY TO RENDER THE LOTS SUITABLE FOR THEIR INTENDED USE. EACH OUTLET SHALL HAVE FREE -FLOWING, POSITIVE DRAINAGE TO AN APPROVED STORMWATER CONVEYANCE SYSTEM OR TO AN APPROVED OUTFALL LOCATION. B. OUTLETS ON EACH LOT SHALL BE LOCATED WITH A FIVE-FOOT HIGH, 2 X 4 STAKE MARKED "STORM". THE STUB- OUT SHALL EXTEND ABOVE SURFACE LEVEL, BE VISIBLE AND BE SECURED TO THE STAKE. C. PIPE MATERIAL SHALL CONFORM TO UNDERORAIN SPECIFICATIONS DESCRIBED IN KCRS 7.04 AND, IF NON- METALLIC, THE PIPE SHIAU CONTAIN WIRE OR OTHER ACCEPTABLE DETECTION. D. DRAINAGE EASEMENTS ARE REQUIRED FOR DRAINAGE SYSTEMS DESIGNED TO CONVEY FLOWS THROUGH INDIVIDUAL LOTS. E. THE APPLICANT/CONTRACTOR IS RESPONSIBLE FOR COORDINATING THE LOCATIONS OF ALL STUB -OUT CONVEYANCE LINES WITH RESPECT TO THE UTILITIES (I.E. POWER, GAS, TELEPHONE, TELEVISION). F. ALL INDIVIDUAL STUB -OUTS SHALL BE PRIVATELY OWNED AND MAINTAINED BY THE LOT HOMEOWNER. 24" MIN COVER (BOULDER MIX) SEE SHEET W4 FOR DETAIL SEE GEOTECHNICAL REPORT 6" MIN BEDDING 1 1/2" CRUSHED ROCK DO NOT DROP OR PLACE LARGE BOULDERS DIRECTLY ON TOP OF PIPE. FOR PIPE PROTECTION , - 1. ORIGINAL GRADE (PRIOR TO OCT 2015) \Ex 24' CIP SS 1" ORIGINAL THICKNESS 0.7" CURRENT THICKNESS PLACE LARGE ROCKS 6" MIN TO EITHER SIDE NOTE_ 1. APPLIES IF THE EX SS PIPE BECOMES EXPOSED PRIOR TO CONSTRUCTION. COLD CREEK SEWER PIPE CROSSING DETAIL (OPTION B) LAKEHAVEN UTILITY DISTRICT STANDARD SEWER NOTES 1. ALL WORK AND MATERIALS SHALL CONFORM TO THE STANDARDS OF LAKEHAVEN UTILITY DISTRICT AND WASHINGTON STATE DEPAMENT OF TRANSPORTATION/WASHINGTON STATE CHAPTER AMERICAN PUBLIC WORKS ASSOCIATION (WSOOT/APWA) "STANDARD PLANS FOR ROAD, BRIE AND MUNICIPAL CONSTRUCTION," LATEST EDITION. 2. CONTRACTOR SHILL VERIFY THE LOCATION OF ALL UTILITIES THAI MAY BE AFFECTED BY THIS WORK AND SHALL NOTIFY APPROPRIATE UTILITY COMPANIES TO FIELD -LOCATE THEIR FACILITIES BEFORE STARTING ANY EXCAVATION, IN ACCORDANCE WITH RCW 19.122. 3. CONNECTIONS OF NEW MAINS TO EXISTING FACILITIES SHALL BE TEMPORARILY SEALED OFF UNTIL AFTER UPSTREAM CONSTRUCTION IS TESTED, CLEANED AND ACCEPTED. ALL CONSTRUCTION DEBRIS AND WATER SHALL BE REMOVED PRIOR TO OPENING THE SEAL, WITHOUT FLUSHING THE DEBRIS DOWNSTREAM. 4. GRAVITY SEWER PIPE MATERIAL SHALL BE AS SHOWN ON THE PLANS, WHICH WILL BE ONE OF THE FOLLOWING AND NOT NECESSARILY INTERCHANGEABLE: • POLYVINYL CHLORIDE (PVC) ASTM D-3034, SDR 35 (4" THROUGH 15") OR ASTM F-679, SDR 35 (18" AND IN LAAM • POLYVINYL CHLORIDE (PVC) AWWA C-900, DR-18 (4" THROUGH 12") OR AWWA C-905, DR-18 (14" THROUGH 36") • HIGH DENSITY POLYETHYLENE (HOPE) ASTM F-894, WITH GASKETED JOINTS • DUCTILE IRON ANSI A21.51/AWWA C-151, MINIMUM CLASS 52, EPDXY -LINED WITH PROTECTO 401" CERAMIC EPDXY 5. CRUSHED SURFACING TOP COURSE (AKA S/8" CRUSHED ROCK) SHALL BE USED FOR PIPE BEDDING FOR RIGID AND FLEXIBLE GRAVITY SEWER PIPE. THE MATERAL SHALL BE PLACED UNDER THE PIPE TD A COMPACTED DEPTH OF 4".(FOR 27" AND SMALLER PIPE), AND TO A COMPACTED DEPTH OF 6' (FOR PIPE GREATER THAN 27"), THE MATERIAL SHALL BE PLACED 6' OVER THE TOP OF FLEXIBLE PIPE AND TO THE SPFURGUNE OF R1O1D PIPE. TO ASSURE UNIFORM SUPPORT, THE MATERIAL SHALL BE CAREFULLY WORKED UNDER THE PIPE HAUNCHES WITH A TOOL CAPABLE OF PREVENTING THE FORMATION OF VOID SPACES AROUND THE PIPE. 6. ALL TRENCH BACKFILL SHALL BE COMPACTED TO 95% OF RELATNE DENSITY. OR GREATER IF 50 SHOWN ON THE PLANS OR OTHERWISE REQUIRED BY THE ROAD AGENCY HAVING JURISDICTION, FROM THE BOTTOM OF THE EXCAVATION TO THE SURFACE. DEVELOPER SHALL BE RESPONSIBLE FOR ALL COSTS INCURRED FOR COMPACTION TESTING. 7. TRENCH BACKFILL SHALL BE COMPACTED PRIOR TO TESTING SEWER MAIN PIPE, AND SIDE SEWER STUB(S) SHALL BE AIR TESTED AT THE SAME TIME AS THE SEWER MAIN, 8. MANHOLES SHILL CONFORM TO WSDOT/AP.WA STANDARD PLAN 8-23k TYPE 1 OR TYPE 2 WIN ECCENTRIC CONES, AND INCLUDE I -INCH GALVANIZED DROP SAFETY STEPS OR POLYPROPYLENE SAFETY STEPS (LANE iNTERNATLONAI CORP. PART NO. P-14938) AND AT LEAST ONE (I),. AND NO MORE THAN FIVE 0), FOUR -INCH (4') HIGH ADJUSTMENT RINGS BELOW THE FRAME AND COVER. ALL MANHOLE EXTERIOR SURFACES SHAM. RECEIVE A PROTECTIVE COATING OF BITUMINOUS COAL TAR TO A MINIMUM THICKNESS OF 50 MILS, APPLIED AT THE FACTORY. WHERE NOTED ON THE PLANS; MANHOLE INTERIOR SURFACES SHALL RECEIVE A CORROSION PROTECTIVE EPDXY COATING OF: • POLYSHIELD SS-10D& (BY SPECIALTY PRODUCTS, INC. (LAKEWOOD, WA); 50 MILS MINIMUM THICKNESS); OR • RAVENO 405 (BY RLS SOLUTIONS INC. (OKLAHOMA); 100 MILS MINIMUM THICKNESS). ALL COATINGS SHALL BE APPLIED IN ACCORDANCE WITH THE MANUFACTURER'S INSTRUCTIONS 9. MANHOLE FRAMES AND COVERS SHALL BE CAST IRON, WITH THE WORD "LAKEHAVEN' CAST IN THE TOP, SHALL WEIGH 140 TO 150 POUNDS, AND SHALL HAVE A SINGE 1-INCk UFT HOLE FITTED WITH ONE 3/4' X 3" GALVANIZED CARRIAGE BOLT WITH BURRED END TO RETAIN THE NUT AND A FLAT WASHER TO ALLOW FOR 1" BOLT TRAVEL. COVERS SHALL BE 25" IN DIAMETER 10.CONCRETE COLLARS REINFORCED WITH WIRE MESH SHALL BE INSTALLED PER DISTRICT STANDARD PLAN WHERE SHOWN ON THE PLANS. 11.10ANHOLE CHANNELS SHALL BE PRODUCED TO THE FULL DEPTH OF THE ASSOCIATED PIPE DIAMETER AND TO A WIDTH NO LESS THAN THE OUTSIDE DIAMETER OF THE ASSOCIATED PIPE AND NO MORE THAN %-INCH IN EXCESS OF THE OUTSIDE OUTAETER OF IRE ASSOCIATED PIPE. MANHOLE CHANNELS SHALL HAVE A SMOOTH FINISH. TO MM11MIZE TURBULENCE. SIDE CHANNELS FROM INLET PIPELINES SHALL BE CURVED IOWARD THE OUTLET PIPELINE TO PROVIDE A SMOOTH LAMINAR FLOW TRANSITION FROM ALL INLET PIPELINES TO THE OUTLET PIPELINE. 1=,11EL MATERIAL SHALL BE A SHRINK -RESISTANT GROUT MIX. USING BSACKS PER CUBIC YARD PORiLAND CEA1EHi AND 7/8" GRADED AGGREGATE. FOR GRAM SEWER SYSTEMS 15- AND LARGER. PREDI.[S MANHOLE LINER SYSTEMS BY PREDL SYSTEMS NORTH AMERICA,INC. (BURRVABY, B.C.) SHALL BE URUZED FOR CHANNELS, FLOORS AND PIPELINE CONNECTION SYSTEMS FOR MANHOLES. 12.MANHOLE SHELVES SHALL HAVE A BROOM FINISH, AND BE SLOPED i1-INCH TO 1-INCH PER FOOT TOWARD THE CHANNEL. 13.PIPE ENDS OF ALL INLET AND OUTLET PIPELINES SHALL NOT EXTEND MORE THAN 2 INCHES INSIDE THE MANHOLE, AND ALL PEMEfthONS SHALL BE SMONKY.GROUTED AROUND THE PIPE WITH SHRINK -RESISTANT GROUT, NIS NOT USED CONSTRUCTION SEQUENCE NOTES 1. INSTALL ALL TEMPORARY EROSION CONTROL MEASURES, GENERAL AND SITE -SPECIFIC, AS NOTED ON THE PLANS AND SUPPORTING DQCUMENTS OR AS REQUIRED BY VARIOUS PERMITS AND AUTHORIZATIONS. Z UNDER THE SUPERV&W Of THE STREAM RESTORATION CONSULTANT, CONSTRUCT A SANDBAG AND PLASTIC COFFER DAM (OR APPROVED ALTERNATE) ACROSS THE STREAM CHANNEL AT OR UPSTREAM OF THE LIMIT OF THE AFFECTED IN -STREAM WORK AREA, TO CREATE A POOL PLACE FLEXIBLE DIVERSION PIPE OF SUFFICIENT SIZE TO CARRY FLOW AND ANY FISH IN THE UPSTREAM POOL. TO A POINT DOWNSTREAM OF THE DOWNSTREAM LIMIT OF THE WORK AREA. THIS DIVERSION PIPE MAY BE MOVED FROM SIDE TO SIDE AS NEEDED TO STAY OUT OF THE WAY OURING iN-STREAM CHANNEL RE-FORMATION ACTIVITIES. ALTERNA7IVELY, FLOW MAY at PUMPED AROUND THE WORK ARE0. IF A PUMP IS USED. THE PUMP INTAKE IS TO BE SCREENED BY AN INNER SCREEN WITH MAXIMUM 1/8-INC44 MESH TO KEEP FISH FROM ENTERING THE PUMP AND AN OUTER SCREEN WITH MAXIMUM 1/2-INCH MESH TO RETAIN DEBRIS. THE INNER SCREEN AREA IS TO BE LARGE ENOUGH TO ENSURE VELOCITIES THROUGH THE SCREEN OF LESS THAN DA FEET PER SECOND UNDER MAXIMUM EXPECTED FLOWS DURING THE PERIOD OF PROJECT DURATION. THE DISCHARGE IS TO BE POSITIONED TO MINIMIZE EROSION OR TURBIDITY RESULTING FROM THE DISCHARGE VELOCITY OF THE WATER. 3. CONSTRUCT A SECOND SANDBAG AND PLASTIC DAM ACROSS THE DOWNSTREAM UNIT OF THE AFFECTED WORK AREA TO RETAIN ANY SILT -LADEN WATER THAT MAY COLLECT AS A RESULT OF IMPLEMENTATION ACTIVITIES. COLLECTED SILT -LADEN WATER IS TO BE PUMPED TO UPLAND AREAS FOR DISCHARGE, BIOFILTRATION, AND/OR INFILTRATION. 4, ANY FISH ISOLATED IN THE LOCALIZED IN -STREAM WORK AREA WILL BE REMOVED BY THE STREAM RESTORATION CONSULTANT. GIVEN THE SIZE AND CHARACTERISTICS OF COLD CREEK. IT IS EXPECTED THAT STRANDED FISH CAN BE LOCATED AND CAPTURED USING DtPNETS OR SMALL SEINES. FOLLOWED BY ELECTRORSHING. EFFORTS TO CAPTURE AND RELOCATE FISH BY NETTING METHODS ARE TO PRECEDE ELECTROFESIUNG. CAPTURED FISH ARE TO BE RELEASED IN UNAFFECTED REACHES UPSTREAM AND DOWNSTREAM OF THE PROJECT AREA. 5. IT IS ANTICIPATED THAT A SPYDER-TYPE HOE OR EXCAVATOR WILL BE USED TO PLACE THE WOOD AND ROCK MATERIAL5 IN THE STREAMBED TO RE-FORM IT, WITH THESE MATERIALS DELIVERED TO WITHIN REACH BY A CHUTE SYSTEM FROM A STAGING AREA UPSLOPE 6. EXCAVATE ANY DEPRESSMS IN THE STREAM CHANNEL BOTTOM TO ACCOMMODATE THE PLACEMENT OF PROPOSED LOG STRUCTURES, ANY SUCH EXCAVATION 5S ANTICIPATED TO BE MINIMAL, GENERALLY AS REQUIRED TO ACCOMMODATE ROOTWADS.WHICH MAY OTHERIWSE TEND TO PROP SOME LOGS UP TOO HIGH ALONG THE PROFILE ANY NON -GRAVEL OR NON --ROCK SPOILS GENERATED MAY BE USED TO RE -GRADE STREAM BANKS ABOVE ORDINARY HIGH WATER ONLY. 7, PLACE THE MWORTY OF THE SPECIFIED WOODY MATERIALS ALONG THE AFFECTED CHANNEL SECTION AS SHOWN AND POSITIONED ON THE PLANS MUR TO PLACING THE SPECIFIED GRAVEL/COBBLE/BOULDER CASCADE MIX (SEE SPECIFICATIONS AND BELOW). ANCHOR ASAND WHERE INDICATED. FOUR TYPES OF WOODY MATERIALS ARE SPECIFIED FOR THIS PROJECT: I) UPRiG4T CEDAR OR FIR NOMADS, 2) CEDAR TREE TOPS WITH LIMBS, 3) CEDAR OR FIR TRUNKS WITH ROOT WAGS, AND 4) DETACHED CEDAR LIMBS (SMALL WOODY DEBRIS). ALL OR NEARLY ALL OF THE WOOD IN THE FIRST THREE CATEGORIES (THAT IS, EXCLUDING SMALL WOODY DEBRIS) 15 TO BE PLACED PRIOR TO PLACING THE SPECIFIED GRAVEL/COBBLE/DOULDER CASCADE MIX. SOME SMALL WOODY DEBRIS IS ALSO TO BE PLACED INITIALLY, WITH THE REMAINDER INTERSPERSED WITH THE ROCK MIX AS IT IS PLACED. MODIFY OR REMOVE SHORT SECTIONS OF FILTER FENCING, WHERE PRESENT, AS NECESSARY TO ALLOW tOG STRUCTURE PLACEMENT. B. PLACE THE SPECIFIED GRAVEL/COBBLE/BOULDER MIX. INTERSPERSED WITH THE REMAINING SMALL WOODY DEBRIS, SLT4IEEN AND AMONGST THE PLACED WOOD STRUCTURES" PLACE THESE MATERIALS, AS DETAILED, TO FORM THE DESIRED CASCADE HABITAT CON51SING OF NUMEROUS AND VARIED, SOMEWHAT RANDOM, SHORT PLUNGES INTERSPERSED WITH SHALLOW POOLS. COORDINATE WITH THE STREAM RESTORATION CONSULTANT TO INDIVIDUALLY PLACE AND POSITION THE LARGER, SPECIMEN BOULDERS TO ACHIEVE THIS EFFECT AND FUNCTIONING. 9. INSTALL PIPE RESTRAINTS AND ANCHOR$ OR THE 8-INCH SEWER AND 18-INCH STORM PIPES AS SHOWN ON THE PLANS" PLACE SPECIFIED ROCK MATERIALS OVER AND AROUND AN EXPOSED 8-INCH DUCTILE IRON SANITARY SEWER LINE ENTERING THE MANHOLE ON THE LEFT (VEST) BANK. 10. FOLLOWING COMPLETION OF IN -STREAM WORK, ENSURE THAT SILT FENCING IS INSTALLED AND IN 400D CONDITION ALONG BOTH STREAMBANKS BORDERING AREAS TO BE PLANTED, AND ANY OTHER DISTURBED AREAS. 11" ANY SILT -LADEN WATER COLLECTING IN THE IN -STREAM WORK AREA .IS TO BE ALLOWED TO SETTLE OR DISSIPATE PRIOR TO RECONNECTING THE OE -WATERED WORK AREA TO THE FLOWING STREAM BY REMOVAL OF FIRST THE DOWNSTREAM THEN THE UPSTREAM SAND BAG AND PLASTIC DAMS AND ASSOCIATED BYPASS PIPING. 12 A MANHOLE ON THE RIGHT (FAST) GAWK 15 COVERED OVER BY SOILS THAT HAVE SLID DDWN THE STEEP RAVINE SiDESLOPE THIS MANHOLE AND THE AREA IMMEDIATELY AROUND IT ARE TO BE AVOIDED DURING CONSTRUCTION, BUT IT IS TO BE EXPOSED AND MANHOLE RISERS ADDED TO BRING THE RIM TO EXISTING GRADE, THEN FlRE-4RADED AFTER IN -STREAM WORK IS COMPLETE AND BEFORE EXCAVATING OR GRADING EQUIPMENT LEAVES THE SITE, SEE DETAIL 1. SHEET C5"0. ADD RISERS AS NEEDED TO EXISTING GRADE. C E U %I W&ItE 9nle 4A SEMI. * P- 204,72'. F.206.973 engineering PIIC-..lpdem Stump 3 Sr Loy 4 Etsk+kiL t':C�� No Rni Z�Z3 / Y Two Inches Al Full Scale II Nat Scole Accordingly I- Cie V Lu W 3�-i 0 V Lu _ I a- Cie V Q QZ ZN QO�/� � N ce Z Se Lu LLU u wZ a Cie V Lu se Q \J/ i J J Z OD V � Project No 279-15-01 le- Dale 2/23/16 Sale As Noted Designed MJS Checked Drawn SIN Approved L Deecriplio- DETAILS 81 NOTES THE WATERSHED COLD CREEK SANITARY SEWER COMPANY 750 Sbdh Street South Kirkland WA 98033 p 425.822.5242 www.watershedco.com TRUNK LwmmmNE CROSSING PROJECT Science & Design / / 1 V "J � •� / v 'v v •L �/ •L f v v v W r^Y1 Vi` Oi a GRAvttp� �- ' w w v w v w w w pw w , W Q V o '� F e �stJ_': �'�' -L� -_ ma's• '1. ., w w yr w w w w w / �'US04 z i�, J � rn f _�a� -- - J_.. sr- - � w w w Uj 0 In _ ��� vsr�- -� y �� i [-ram-�`^. �- - •� �� - �' w Tw � ,, w - � a, ti w w .y � d. 7 �• w t •,v \ � I•._,[ 0 } LLj } f� J ~ Q w -�` y �'� `� `•.� W w W.__ssr�-•Y- =. �� `y"`y�' 4 L� ]�yy- _ w y~-'v lit _• U I Z m W LL f9°�` `xB� ��� }-' ~ `� - ` •ty - ~ ~ r_ ��..` w \yF w` W - w w - `V ~t� yY F-1 ry /Q a w w ,y. �W�-V _'Z� `�� �' \'r -v ;'+iC 'w _W --ti•�--� -�4'- Ir -i' 1•""I 0 aciwNUKrGrti� �' �y "�-�-4 w��w _~+tom• �_µt" _ __ �V i �'�_ �.�,y v_-_ �. �°'-�-- �.�r%•_ fr=-���?:^ -'+^ `�, �kk_ � a J m w re � � } �, �.� - �k. �� _��,-a-. � � 1� � � 1 _ _ �w ' � .Y ,+L - t.f(,�, ` .'t � ` `I'-_ � 'v l }, w� �,�s-• � �� �.^ � b�� U �i � -=`-'_ -3 .prLa~�T� r±�31 i �! 41Qr /-./r r_����^I :•`� .'` r _ =; /I.'' -`ro �y �wo°- !`k�1-� r: — i_.�! t r tfr — r=rr ao wwwr tros --+' r r _�� {rr /r �, SFr r•T55� ; 5 - rr. ' ir.�. off/rrr __ - r s I4\�}� +I r - N 111 F Z � O 16 LZI � � DO L� I Y� ��� :�: ,'�-i � _---� • Ir' r��---w._�•r rr¢ -�� - r ` ee .Q r • off! 1 EXISTING CONDITIONS THE WATERSHED COMPANY MAR 2 4 2016 m y 2 GRADING PLAN 750 SIXTH STREET SOUTH, KIRKLAND, WA 3 LARGE WOODY DEBRIS PLACEMENT PLAN 98033. (425) 822-5242 9 DJEC7AR A S 4 STREAM CHANNEL CROSS AND LONGITUDINAL SECTION 5 LARGE WOODY DEBRIS DETAILS + MATERIAL SPECS CITY OFFME 9-N 6 RESTORATION PLANTING PLAN �� WAY 7 PLANT INSTALLATION DETAILS AND NOTES CDS SHEET SIZE: 1 8 MITIGATION PLAN NOTES ORIGINAL PLAN IS22'z34'. �••» \A LEGEND SCALE ACCORDINGLY ' NOTES 1. CRITICAL AREAS DELINEATED BY = DELINEATED COLD CREEK OHWM PROJECT MANAGER: HM THE WATERSHED COMPANY ON DESIGNED: GJ r SEPTEMBER 1, 2015 I _� DELINEATED WETLAND R CHECKED://�DRAFTED: LV 2. SURVEY RECEIVED FROM TETRA _ _ I \ / JOB NUMBER: GJ, AR � 1C1 1TY MAP TECH. — -WETLAND BUFFER EXISTING CONDITIONS 0 10' 2D' 40'' NOT FOR 140809 CONSTRUCTION SHEET NUMBER: W1 OF 8 ------------- _ — = r _�` -�' .� �•` �. � .Ifs'"_ -,.�' -' �J. ��'_ _ '� �-�~_�� - ' j -► _ _- �-- - � � � - ._�_.,m. _• �r�`•-__� -�— 1�' � � .1e- � � � rrr .' !• - - SEE DETAIL S ON SHEET C5.0 AND - -_» -�j _ -C� _-_�-•.�jL_�� _�{�"r� � fir D C4.0 TO SSA � `' � �� _ ~ � v e _ � ` � � - - _ 1 � - - r. _ � - ! - r__ • _ R-' w� -_- V - EXPOSE AND RANOTES ON C2 0 ISE EXISTING— ~y `I �~ W�-4!^~�- �Y•` �/ MANHOLE l`!`—`���is"`�`- __` l��if1 -� 4 11 `�+ ��Sg� -' _ � � •_ - - - -� - �Y - rr. � y�� WETLAND EXTENDS ■ ■ � `,- - - - -__ _ _ d/DOWiVSLOP#lFRpNI 2(r ` � - �I 5 BOUNDARY TO STREAM: 100 ec� �% • ��_ w,f: r' ��d� �! �. �Y r�~`�y:. 76`J W I �.r �,•-- 1l 14 / • _� rlr �'•r!l � �.��•r/-•� � -` � lam. . •' r- •.. r r' _�-' !rr _.' !. r. r64 * wa ��� �°=rrr,t 8' �■ 1 - SEE SHEET C4.0 FOR I rlrr �/ - _ _ r r f' ■ ! j GRADING THIS AREA. ` JR 1 1 r, .�_� �_� !` � rr .rrr^ -� �� /r rf �;�`� � ■`r 1 �'�1 �_ - ��:� rr`r r S f 11 ■ V,:.�.�__yr� J ! 'r -gam - frrrrrFr f APPROXIMATE LIMITS OF } 1 �'�� r ` r r r STRFAM13ED SUBSTRATE r t ■ •� \� � r � r� _ � _ PLACEMENT fr i \ \ ,e� ;■ � t r f^ 20•� _� '� � rr. r f f r � r ♦ I n _. -- - r ti` \----- r - �.Y'`r�rrf rr f r `r' ►r !r -! . ..' rr / •�1�` ■�■1 i�S-ti - r- �~ �a -r rr f rr f rr r' r • rrr % " ■ ,♦ y i , ■ i� `- -f-`• -'�('---------•� _ _ �--�f % rrrr ram. rr- `ry / r� `ti �■J��-`I J �- -- _-- -- -... � �- � pro:_._ � � frr rr y r!r rrr yr• rrr ■- i' r` r - - ■ 36" I I - N N 1 • I GRADING PLAN lIr LEGEND MK, DELINEATED WETLANDS DELINEATED OHWM 78 — PROPOSED CONTOUR -7e --- EXISTING CONTOUR APPROX. LIMITS OF STREAMBED SUBSTRATE PLACEMENT DRAFT NOT FOR CONSTRUCTION 0Coffigo-meWMW.dCa THE WATERSHED COMPANY 750 Sixth Street South Kirkland WA 98033 p 425.822.5242 www.watershedco.com Science & Design ��r�TT^777 0) N W0 U M I;o O �+ 0.' C-1 00 a a >- W JF->a C/] w J Q O W F- U) < J Z) U tzN0 WW~]ML- Q N QxaY m 0 E-+ Z O S2 m J I_ Co Co U) SHEET SIZE: ORIGINAL PLAN IS 22' x 34. SCALE ACCORDINGLY. PROJECT MANAGER: HM DESIGNED: GJ DRAFTED: LV CHECKED: GJ, AR JOB NUMBER: 140809 SHEET NUMBER: W2 OF 8 - - - -- _ — ----- -__ - -- LEGEND DELINEATED OHWM ~'--------_--_-rk 2 ROOTWAD tiY5 1 Iv- \I/ V - �� B. / ``� - �3$ r 1' LOG WITH ROOT WAD e =4 " - •err `r l CEDAR TREE TOPS -�,� -r'rr } - ! �{/ 78 PROPOSED CONTOUR --m --- EXISTING CONTOUR kEe_ - yp _ _ `■' _ M1 Ss ` - -�' _� - _ - f F r rr/� ' / �r' 1v'n74NCHaR LOGS INDIVIDUALLY ACCORDING TO THE DETAILS. _«. ! 2. FINAL LOG STRUCTURE PLACEMENT SHALL B= t DIRECTED INFIELD BYTHE RESTORATION ` �■ ■ ■ -``} y ' CONSULTANT. WTLAIVDEXTEND§ t ■ ■�-------- .m. �_--. ----yl % �-14/bOWNSLOP,t-FROM ■■■�` ��,k - - ^ - _ 7 - - - - - - -- Y 3. MINIMIZE DISTURBANCE TO STREAM BANK �� - l 7/ - _ _�(/ _ _ _ __ �J % WHERE POSSIBLE BOUNDARY TO STREAM, � � � ` ` - _ -� _ _ �� r` �� � •� 4. SMALL WOODY DEBRIS PLACEMENTTO BE 4. APPROVED BY RESTORATION CONSULTANT. ■t ~i r 5. ALL WOODTO BE INTEGRATED INTO PLACED _ _ ROOT WAD�W4 ROCK - SEE SHEIETW4. y y SEE ANCHORING DETAIL _ _ - - - - - - - `�_ ..✓_� - - - - - -� "r r �� �`� IT 0 M.-I 1 - ' - ` . y' { r r r r • -q.�rr r...rl l � � } - `- --- SAL _ T + O f ` / W - ------ LA RG rz WOODY DE BRI S °ter=85r SEE ANCHOR INGDETAIL ' ■ ■■ �/ 1 f l _ -�'WWI' • I r, `r- /•r/rr �Frrr _ err L\L■ ■■ I �7 _ rrr- rr . ` + Y _/ �. ' � 1�• fr � ■ L �� rr � r rr / / /r r �^ 1 r rf I ■ ■■ LL Ly \ t ++ _ l J+ _r r � 1 �����' r r' �/ r // rr .` � _ r t t ■ ■ � � 1 � i r „� � � L r�r + J J � _/ r F r _ Y� yJ t t , \ L \ r +�+ • i _ L\ `~" -"--- r _ r , iJ •F frr f f1 ` J Ir rf ,J 4' `1 M1��. ■■ I i l„ f -� . _� ' Ltt �-------- + - f rJrr Ir// Fr � rr rrrl Y r'_ � rf � ■, ■1 \■ 1.■� I IE�Hj _r �� J �i'�r 221 24'- W L% V N { N LARGE WOODY DEBRIS PLACEMENT PLAN 5 1wy 4 0 DRAFT NOT FOR CONSTRUCTION 0C%V1,;h1,Tha W6m.hW THE WATERSHED COMPANY 750 Sixth Street South Kirkland WA 98033 p 425.822.5242 www.watershedco.com Science & Design W W 0) W,o N M t'D O �y CO DO " } W Q ~ Cn LLU a f- < LU T i J z N o Uj W W ~ > LL = O a W U aY � x Q J m O U � r . O a SHEET SIZE: ORIGINAL PLAN IS 22' x 34'. SCALE ACCORDINGLY. PROJECT MANAGER: HIM DESIGNED: GJ DRAFTED: LV CHECKED: GJ,AR JOB NUMBER: 140809 SHEET NUMBER: W3 OF 8 ._.EST. 24^ COVER { STA:3+84 £LEV'81. RECENT ' DEBRI JAM EXISTING 241NCH PIPE 90 REMAIN) ' - PROPOSED ROUGHENED CHANNEL SUBSTRATE. MIX TO CREATE BOULDERCASWEHAWAT. I Awl I 50 2+75 3+00 3+25 3+50 3+75 4+00 4+25 4+50 1 STREAM CHANNEL LONGITUDINAL SECTION Scale X: 1"=40' 6X Vertical Exaggeration 90 88 86 84 82 80 78 76 74 72 70 68 66 64 62 60 MIX NATIVE SOIL AND PLACED ROCK AT TRANSITION TO SUPPORT REVEGETATION BOULDER MIX TO BE INTERSPERSE SMALL WOODY DEBRIS EXTEND BOULDER MIX TYP. 2' DEEP ON SLOPES AMONGST ROCK AND LARGE WOODY 2' UP BANK FROM DEBRIS DURING PLACEMENT -SEE CHANNEL BOTTOM 82 o� CONSTRUCTION SEQUENCE NOTES. 'V j — 16.00' 811 LOW FLOW CHANNEL $ 2 s��1=1I1^III=i 7 4.00' I 1-111:R6• DEEP79—�I=l 1=1I1— IIl=R-1111I 78�I I I-1TL=1 11-1 I I=1 —I I l-i I I^f 11 — — — — . — . T[ [ }=I I 1=11 I— 11—I I [—I i I —III —III— --- "t1=1! hI 1[=111�I I I-1 1 1=I 11— 1 11=1 I ICI 11=1 11-11 76 1 [EI I I^I 11-1 11 =I I I1111_I I I-� i=�,i j �_ E_:I I M I ICI I hI 1 R i 1 1—I 11 =I 11—I I IR 11—I I hI 11=1 I I_.. 11= , z — I I =1 11=11 MI I EE111=1 11 ANCHOR PER DETAILS f 1=1 I I=[ f I--1 I -I I f=1 11=1 I I-11 I l 1 I-1 [ I-1 I ws 1=1 ICI 11=111 II I-1 I I-1 I ICI I El 11- THE WATERSHED COMPANY 750 Sixth Street South Kirkland WA 98033 p 425.822.5242 www.watershedco.com Science & Design PZ 0 W N wQ U f0 W O V U Q Qw0U) W Q w�a ~ Q��/ W U J I zNo xU wwl_WM w L —I = Ati� w w A a ¢ m o U� I-1-1 11—I I I —I I I-1 I I —_I z III —I I 1-111-1 I 1-111— O —I I El I IE 111=1 I Fd I I — El I F9 l I --I 11=1 I ICI -1 i 1=1 11—TIER—[ I l- m ICI I 1=111-=1 I 1=III=I —1117 711 I —I 11=III—I 11- 1I E � 1 I I1EIM, i i 1 l[ i i � 1 I 1 � � � 1 1. SEE W5 FOR ROCK SIZE SCHEDULE =i i=1 I I =1 11=1 11=11 !=1 11=1 11=f 1=1 I hI 11=1 i ICI 11=1 [ 1=111=1 11=1 I hI f[ f 1 f=1 f 1 -1 11=_1 11=1 11-1 11 1 I<—i i 1 1 I 1-1 I I-- Ir ,i l Ir lllirl i!I IIIIr Illfl;,lllirlll, rllll rl l ; Ilhill l!r rllll rl l 11 rI l Iir111 rl It rlilill l [irllF1I 1t; {1 I F1III l I ii 1 IFE1 I l I r� STREAM CHANNEL CROSS SECTION STREAM CHANNEL CROSS AND LONGITUDINAL SECTION DRAFT' NOT FOR CONSTRUCTION SHEET SIZE: ORIGINAL PLAN IS 22" x 34', SCALE ACCORDINGLY. PROJECT MANAGER: HM DESIGNED: GJ DRAFTED: LV CHECKED: GJ, AR JOB NUMBER: 140809 SHEET NUMBER: W4 OF 8 FACE OF LOG SHALL BE SMOOTH PREFERRED OPTION: LOG — THREADED W (OR'Yr' DLAMETER — GALVANIZEO EYE$01.7) SHALL PASS THROUGH MIN- W OF SOLID WOOD. PRE -DRILL PILOT HOLES THROUGH THE CENTER OF LOGS. USE 3' GALVANIZED BRIDGE WASHERS AT EACH END. ONCE NUT IS FIRMLY SECURED, CUT OFF BAR/BOLTAPPROX 1/4'ABOVETHE NUT AND HAMMER SAR/BOLT END TO PREVENT REMOVAL OF NUT. TOP OF NUT SHALL BE FLUSH WITH THE LOG ATTACH TIPPING -PLATE J r ' - - SURFACE. ANCHORTO CONTINUOUSLY I -- THREADED ROD SHALL EXTEND TO (OR THREADED BAR, AND PLACE I 3 EYE BOLTS SHALL BE CHAINED TO) THE LOG SUCH THAT THE I EARTH ANCHOR SYSTEM CAPABLE OF ROD PASSES THROUGH THE I Z HOLDING 7,000 LBS MINIMUM. IF USING PRE -DRILLED HOLE. I CHAIN IT SHALL BE %' OR I'LONG-LINK SELF -COLORED LASHING CHAIN WITH WORKING LOAD OF 7,000 LBS OR MORE CHAIN SHALL BE A MAXIMUM TWO (2) I FEETLONG. CHANNEL,. BANK — DRIVE ANCHOR APPROX. 309 FROM VERTICAL AND 30 a LANDWARD FROM A LINE PARALLEL TO THE BANK (I.E. AIMED UPSTREAM AND INTO THE BANK) MIN T INTO GROUND. 1 LARGE WOODY DEBRIS TYPICAL ANCHORING DETAIL ROOT WAD TYPICAL ANCHORING DETAIL Scale: NTS ALTERNATIVE OPTION: spp �X Z Q Scale: NTS MATERIALS SPEC IFICATIONS 1. Root Wads. Root wads shall be free of rot, native western redcedar or Douglas -fir, minimum 50% cedar, supplied with attached trunks 4 to 7 feet in length above the ground line as the tree grew and a minimum of 18 inches in diameter feet above the ground line. Root masses shall be full and dense to a minimum of 6 feet in diameter. 2. Logs With Attached Routs. Logs with attached roots shall be sound, native cedar or fir, minimum 50 % cedar, a minimum of 16 inches in diameter 10 feet from the root end. Attached root wads are to be full and dense to a minimum of 6 feet in diameter. Logs shall be minimum length of 16 feet. 3. Cedar Tree Tops are to be exclusively native western redcedar trees and have abundant attached limbs. They are to have a minimum diameter of 10 inches at the larger end and a minimum length of 20 feet, but need not Include the very Up of the tree. 4. Small Nroody Debris, Supplied Small Woody Debris shall be supplied as detached western red cedar tree limbs. These limbs are to be generously incorporated into the Gravel/Cobble/Boulder backfill materials placed to form cascade habitat at the direction of the Restoration Consultant. Supplied limbs shall consist entirely of an assortment of cedar limbs, base ends 1 1/2 to 3 inches in diameter, minimum length of 3 feet, minimum average length of 5 feet. Such small woody debris is to be tightly packed when quantifies are measured. Small logs and rootwads encountered on the site but not specifically shown on the plans are to be incorporated into wood structure complexes and Gravel/Cobble/Boulder backfill materials on an opportunistic basis, at the direction of the Restoration Consultant 5. Gravei,Cobbl&Boulder mix. Gravel/Cobble/Boulder mix as specified for this project shall consist of well -graded rounded rock, essentially free from flnes, conforming closely to the following size gradation by weight 3/8 to 3 inches 15% 3 to 6 inches 15% 6 to 12 inches 15% 12 to 18 inches 15% 18 to 24 inches 15% 24 to 36 inches 15% 36 inches and larger 10 % Anchoring. Anchors shall consist of Manta Ray MR-3 earth anchors (Foresight Products, LLC 1-800-325-5360) or equivalenL Anchors to be driven minimum 7 feet into ground, or per manufacturers recommendadons. Each anchor is to be placed, preferentially, on the upslope, landward side of the log it will be anchoring, and, where feasible, angled into the soil such that the pull exerted on the anchor is in line with the anchor rod. All anchors shall be set and load tested to approximately 5,000 lbs. If MR-3 anchors are unable to achieve specified load rating, then a larger anchor (MR-2 or MR-1) shall be substituted that meets specified load rating. Alternatively, If MR-3 anchors are unable to be driven to desired level, a smaller anchor (MR-4 of MR-88) shall be used and set to the same load rating. LARGE WOODY DEBRIS DETAILS AND MATERIAL SPECIFICATIONS Each Log with attached roots shall be secured to two anchors, attached no closer than approximately 3 feel from the ends such that the two anchors attached to any given log are at least 10 feet from each other. Each root wad is to be secured with one anchor, attached around the trunk, just above the roots. Anchors shall be chained firmly to the logs they secure, attaching to 3/4-inch diameter galvanized steel eye bohs driven through pilot holes drilled directly through the centers of the logs- Three -Inch minimum diameter hot -dip galvanized malleable iron "bridge" washers (available from Portland boll, hitp'//www.pooartdbdl.cornlpMducts/washersfnrslleallfe iron washer.hlml7 Tic= Clnsg-zVuJMCFOJ-xgodPn5mDw) shall be countersunk and seated below the log surface at each end of each eye bot (providing a flat, bark -free surface for each washer will suffice). The eye end of each bolt shall be directed downward and connected to an anchor rod using 1/44ncch min. galvanized steel chain. Care shall be taken to make the andior connections as short, taut, dean, and unobtrusive as possible to result in a low -profile connection. Once the nut is firmly secured, cut off the bolt approx. % inch above the nut, and hammer the bolt end to prevent removal of the nuL Any anchor that fails to reach load capacity shall be removed and either reinstalled successfully nearby or replaced with a larger anchor or driven deeper at the same or a nearby location. If anchors repeatedly fail to meet the loading requirements or otherwise cannot be successfully placed at or near the locations of individual proposed log structures, then the contractor and the Restoration Consultant on behalf of the owner shall confer to determine if those structures should be relocated or deleted from the project 7. Mulch. Wood chip mulch: Wood chip mulch shall meet WSDOT Standard Specifications for Road, Bridge, and Municipal Construction for Bark or Wood Chips as defined by 9-14.4(3). "Bark or wood chip mulch shall be derived from Douglas fir, pine, or hemlock species. It shall not contain resin, tannin, or other compounds in quantities that would be detrimental to plant life. Sawdust shall not be used as mulch. Quantity required: 145 cubic yards Bark or wood chips when tested shall be according to WSDOT Test Method T 123 prior to placement and shall meet the following loose volume gradation: Sieve Size Percent Passing Minimum Maximum 2" 95 100 No.4 0 30 B. Compost. Compost shall meet WSDOT Standard Specifications for Road, Bridge, and Municipal Construction, 9-14.4(8) for Fine Compost. Quantity required: 7.5 cubic yards DRAFT NOT FOR CONSTRUCTION 0 Coprr4hi. The W-1.h d THE WATERSHED COMPANY 750 Sixth Street South Kirkland WA 98033 p 425.822.5242 www.watershedco.com Science & Design N Yw2' �+D%vyCID Z Y�1 L.L 000 >Q ~U5W j--I LLI } J Q DwF- (� CO W wC] t Z in WF' W M LL fw� Uaw= Y o 1-4 D Ur a to z Q rn N J Q 1— co 0 m SHEET SIZE: ORIGINAL PLAN IS 22' z 34'. SCALE ACCORDINGLY. PROJECT MANAGER: HM DESIGNED: GJ DRAFTED: LV CHECKED: GJ, AR JOB NUMBER: 140809 SHEET NUMBER: W5 OF 8 STEEP SLOPE RESTORATION PLANT SCHEDULE v TREES CITY SPACING SIZE y �, �� ue �V % tgpl THUJA PLICATA / WESTERN REDCEDAR 10 ALL TREES AND 2-3 GAL. FI»��=�� SHRUBSTO WETLAND RESTORATION SHRUBS BE SPACED PLANTING TYPICAL o N� PER TYPICAL epoe'Reemv o"govow w \ w w w\\ j N jaca9� ACERCIRCINATUM/VINE MAPLE 10 1GAL. a v r° u e cvv' a°v °v°vji o c v v. \ \ avciJ[� ` \~!k v o o v° °v cv v : v 9,v v v .rag \ y J� Ji\ `�' \ \ vz� e a° nvaevva cv =q°°svvv \ CORNUSSERICEA/RED TWIG DOGWOOD 40 iGAL. -•__ "- ~ 'z. `°" P" ene° �a9.°9�°y� &,'``ram—� 1 _ _ - o PHYSOCARPUS CAPrrATUS / NINEBARK 50 1 GAL. MULCH PATH TO DEPTH OF 4" - _� - V RESTORE TO EXISTING CONDITION - 1 - - - Y-- - - STEEP SLOPE RESTORATION 1 �� 20.00' �` RUBUS SPECTABILIS / SALMONBERRY 60 1 GAL. PLANTING TYPICAL �'`� -- -_1. --`�- \\-~-- - GROUNOCOVERAND PERENNIAL S' TEMPORARY ACCESS ROAD . ws f _ _ - - _ \ w v �_ ,I, w ,,0--SS _ C PLANTING TYPICAL - [j- -- _ ALL SPECIES TO BE INTERSPERSED AND SPACED TRIANGULARLY ATHYRIUM FILIX-FEMINA / LADY FERN 547 24" O.C. 1 GAL. POLYSTICHUM MUNITUM / SWORD FERN 547 24" O.C. 1 GAL. WCH INIINKFENCE 79 L \ 100 t v .I. v w w • \ v^ _ �� -�Vr y v - NOTE: RESTORATION CONSULTANT TO CHECK COMPACTION OF PLANTING AREA PRIOR TO PLANTING. IF RESTORATION CONSULTANT DEEMS SOIL TO BE TOO COMPACTED FOR PLANTING, DECOMPACTTO A DEPTH OF 8'. PLANT. BLANKET MULCH. • n may- _ w M1' w � `` � �.s,. � _ x�rnvascarta .� \ _~� _ .t%" _ � �� � - r A` N__ � — — �— � WETLAND PLANTSCHEDULE L'-- - I - _ oavvav ZIP at f�rfrk r- .--f `�- rf 1_---- 5 �•-.____ ���•I ' frr f }� l t 1`•; ,74-- � - --� '- fr rf�r�r4 �•fr r r 1� s! [ STREAMSIDE RESTORATION 2 r- tr PLANTING TYPICAL , r p� REDTWIG DOGWOOD STAKES T PLANTING TYPICAL ws 10REDTWIG DOGWOOD STAKE SCHEDULE , SHRUBS CITY SPACING SIZE ImCORNUS SERICEA / RED TWIG DOGWOOD 150 FIELD LOCATED 4' MIN. NOTE: RESTORATION CONSULTANT TO VERIFY LOCATION OF STAKES STREAMSIDE RESTORATION PLANT SCHEDULE REM RESTORATION PLANTING PLAN SHRUBS CITY SPACING SIZE CORN US SERICEA/RED TWIG DOGWOOD 48 ALL 1 GAL. SHRUBSED RUBUS SPECTABILIS / SALMONBERRY 48 BE SPACED 1 GAL. c b N nO j �f SYMPHORICARPOS ALBUS / SNOWBERRY 32 PER TYPICAL 1 GAL. GROUNDCOVERAND PERENNIALS' � 10.00' -� 'ALL SPECIES TO BE SPACED TRIANGULARLY ATHYRIUM FILIX-FEMINA /LADY FERN 442 24" O.C. 1 GAL. EMERGENTS —'ALL SPECIES TO BE SPACED TRIANGULARLY POLYSTICHUM MUNITUM /SWORD FERN 504 24" O.C. 1 GAL. NOTE: MIX NATIVE TOPSOIL WITH PLACED BOULDERS AT INTERFACE OF BOULDERS AND STREAM SHORELINE.:MPORTTOPSOIL AS NEEDED. PLANT. BLANKET MULCH. SEE DETAIL W4.2 SHRUBS CITY SPACING SIZE " it CORNUSSERICEAIREDTWIGDOGWOOD 12 ALL 1GAL. }QC), �J���� SHRUBS TO 0 {I ] LON ICERA INVOLUCRATA I BLACK TWINBERRY 15 BE SPACED 1GAL. PER TYPICAL o RIBES LACUSTRE! SWAMP GOOSEBERRY 15 1 GAL. — — N �l RUBUS SPECTABILIS/SALMONBERRY 18 1GAL• G ROUNDC OVER AND PERENNIALS' 'ALL SPECIES TO BE INTERSPERSED AND SPACED TRIANGULARLY 20.00' - ATHYRIUM FiLiX-FfMINAI LADY FERN 173 24" O.C. 1 GAL. �j EMERO ENT5' 'ALL SPECIES TO BE SPACED TRIANGULARLY CAREX URNUPTA 1 SLOUGH SEDGE 173 24" O.C. 1 GAL. NOTE: REMOVE HOG FUEL FROM CONSTRUCTION ENTRANCE. DECOMPACT SOILTO AN 8" DEPTH. PLACE 2" OF COMPOST. PLANT - RI ANKFT MI II r.w TEMPORARY ACCESS ROAD PLANT SCHEDULE SHRUBS QTY SPACING SIZE ACER CIRCINATUM / VINE MAPLE 8 ALL 1 GAL. SHRUBS TO CDR NUSSERICEA/RED TWIG DOGWOOD 16 BE SPACED 1GAL. xne �d PERTYPICAL o LONICERA INVOLUCRATA/ BLACK TWINBERRY 16 1 GAL. PHYSOCARPUSCAPrrATUSININEBARK 8 1 GAL. -- 20A RUBUS SPECTABILIS! SALMONBERRY 16 1 GAL. �J GROUNDCOVER AND PERENNIALS' 'ALL SPECIES TO BE INTERSPERSED AND SPACED TRIANGULARLY ATHYRIUM FILIX-FEMINA/LADY FERN 218 24"O.C. 1 GAL. POLYSTICHUM MUNITUM / SWORD FERN 218 24" O.C. 1 GAL. NOTE: REMOVE HOG FUEL FROM CONSTRUCTION ENTRANCE. DECOMPACT SOILTO AN 8" DEPTH. PLANT. BLANKET MULCH. 0 10, 20' 40, THE WATERSHED COMPANY 750 Sixth Street South Kirkland WA 98033 p 425.822.5242 www.watershedco.com cience & Design P4 04 o c) m (] W 0 z 0>_w Q J a Jj /U II J N LU Zo WSW Lij M LL. w= m SHEET SIZE: ORIGINAL PLAN IS 22' x 34. SCALE ACCORDINGLY. PROJECT MANAGER: HM DESIGNED: GJ DRAFTED: LV RAFT CHECKED: GJ, AR JOB NUMBER: NOT FOR 140809 CONSTRUCTION SHEET NUMBER: W6 OF 8 PLANT INSTALLATION SPECIFICATIONS GENERALNOTES QUALITY ASSURANCE 1. PLANTS SHALL MEET OR EXCEED THE SPECIFICATIONS OF FEDERAL, STATE, AND LOCAL LAWS REQUIRING INSPECTION FOR PLANT DISEASE AND INSECT CONTROL. 2. PLANTS SHALL BE HEALTHY, VIGOROUS, AND WELL -FORMED, WITH WELL DEVELOPED, FIBROUS ROOT SYSTEMS, FREE FROM DEAD BRANCHES OR ROOTS. PLANTS SHALL BE FREE FROM DAMAGE CAUSED BY TEMPERATURE EXTREMES, LACK OR EXCESS OF MOISTURE, INSECTS, DISEASE, AND MECHANICAL INJURY. PLANTS IN LEAF SHALL BE WELL FOLIATED AND OF GOOD COLOR. PLANTS SHALL BE HABITUATED TO THE OUTDOOR ENVIRONMENTAL CONDITIONS INTO WHICH THEY WILL BE PLANTED (HARDENED -OFF). 3. TREES WITH DAMAGED, CROOKED, MULTIPLE OR BROKEN LEADERS WILL BE REJECTED. WOODY PLANTS WITH ABRASIONS OF THE BARK OR SUN SCALD WILL BE REJECTED. 4. NOMENCLATURE: PLANT NAMES SHALL CONFORM TO FLORA OF THE PACIFIC NORTHWEST BY HITCHCOCK AND CRONQUIST, UNIVERSITY OF WASHINGTON PRESS,1973 AND/OR TO A FIELD GUIDE TO THE COMMON WETLAND PLANTS OF WESTERN WASHINGTON & NORTHWESTERN OREGON, ED. SARAH SPEAR COOKE, SEATTLE AUDUBON SOCIETY,1997. DEFINITIONS 1. PLANTS/PLANT MATERIALS. PLANTS AND PLANT MATERIALS SHALL INCLUDE ANY LIVE PLANT MATERIAL USED ON THE PROJECT. THIS INCLUDES BUT IS NOT LIMITED TO CONTAINER GROWN, B&B OR BAREROOT PLANTS; LIVE STAKES AND FASCINES (WATTLES); TUBERS, CORMS, BULBS, ETC..; SPRIGS, PLUGS, AND LINERS. 2. CONTAINER GROWN. CONTAINER GROWN PLANTS ARE THOSE WHOSE ROOTBALLS ARE ENCLOSED IN A POT OR BAG IN WHICH THAT PLANT GREW. SUBSTITUTIONS 1. IT IS THE CONTRACTOR'S RESPONSIBILITY TO OBTAIN SPECIFIED MATERIALS IN ADVANCE IF SPECIAL GROWING, MARKETING OR OTHER ARRANGEMENTS MUST BE MADE IN ORDER TO SUPPLY SPECIFIED MATERIALS. 2. SUBSTITUTION OF PLANT MATERIALS NOT ON THE PROJECT LIST WILL NOT BE PERMITTED UNLESS AUTHORIZED IN WRITING BY THE RESTORATION CONSULTANT. 3. IF PROOF IS SUBMITTED THAT ANY PLANT MATERIAL SPECIFIED IS NOT OBTAINABLE, A PROPOSAL WILL BE CONSIDERED FOR USE OF THE NEAREST EQUIVALENT SIZE OR ALTERNATIVE SPECIES, WITH CORRESPONDING ADJUSTMENT OF CONTRACT PRICE. 4. SUCH PROOF WILL BE SUBSTANTIATED AND SUBMITTED IN WRITING TO THE CONSULTANT AT LEAST 30 DAYS PRIOR TO START OF WORK UNDER THIS SECTION. INSPECTION 1. PLANTS SHALL BE SUBJECT TO INSPECTION AND APPROVAL BY THE RESTORATION CONSULTANT FOR CONFORMANCE TO SPECIFICATIONS, EITHER AT TIME OF DELIVERY ON -SITE OR AT THE GROWER'S NURSERY. APPROVAL OF PLANT MATERIALS AT ANY TIME SHALL NOT IMPAIR THE SUBSEQUENT RIGHT OF INSPECTION AND REJECTION DURING PROGRESS OFTHE WORK. 2. PLANTS INSPECTED ON SITE AND REJECTED FOR NOT MEETING SPECIFICATIONS MUST BE REMOVED IMMEDIATELY FROM SITE OR RED -TAGGED AND REMOVED AS SOON AS POSSIBLE. 3. THE RESTORATION CONSULTANT MAY ELECT TO INSPECT PLANT MATERIALS AT THE PLACE OF GROWTH. AFTER INSPECTION AND ACCEPTANCE, THE RESTORATION CONSULTANT MAY REQUIRE THE INSPECTED PLANTS BE LABELED AND RESERVED FOR PROJECT. SUBSTITUTION OF THESE PLANTS WITH OTHER INDIVIDUALS, EVEN OF THE SAME SPECIES AND SIZE, IS UNACCEPTABLE. MEASUREMENT OF PLANTS 1. PLANTS SHALL CONFORM TO SIZES SPECIFIED UNLESS SUBSTITUTIONS ARE MADE AS OUTLINED IN THIS CONTRACT. 2. HEIGHT AND SPREAD DIMENSIONS SPECIFIED REFER TO MAIN BODY OF PLANT AND NOT BRANCH OR ROOT TIP TO TIP. PLANT DIMENSIONS SHALL BE MEASURED WHEN THEIR BRANCHES OR ROOTS ARE IN THEIR NORMAL POSITION. 3. WHERE A RANGE OF SIZE IS GIVEN, NO PLANT SHALL BE LESS THAN THE MINIMUM SIZE AND AT LEAST 50% OF THE PLANTS SHALL BE AS LARGE AS THE MEDIAN OF THE SIZE RANGE. (EXAMPLE: IF THE SIZE RANGE IS 12" TO 18", AT LEAST 50% OF PLANTS MUST BE 15" TALL.). SUBMITTALS PROPOSED PLANT SOURCES 1. WITHIN 45 DAYS AFTER AWARD OF THE CONTRACT, SUBMIT A COMPLETE LIST OF PLANT MATERIALS PROPOSED TO BE PROVIDED DEMONSTRATING CONFORMANCE WITH THE REQUIREMENTS SPECIFIED. INCLUDE THE NAMES AND ADDRESSES OF ALL GROWERS AND NURSERIES. PRODUCT CERTIFICATES 1. PLANT MATERIALS LIST- SUBMIT DOCUMENTATION TO RESTORATION CONSULTANT AT LEAST 30 DAYS PRIOR TO START OF WORK UNDER THIS SECTION THAT PLANT MATERIALS HAVE BEEN ORDERED. ARRANGE PROCEDURE FOR INSPECTION OF PLANT MATERIAL WITH RESTORATION CONSULTANT AT TIME OF SUBMISSION. 2. HAVE COPIES OF VENDOR'S OR GROWERS' INVOICES OR PACKING SLIPS FOR ALL PLANTS ON SITE DURING INSTALLATION. INVOICE OR PACKING SLIP SHOULD LIST SPECIES BY SCIENTIFIC NAME, QUANTITY, AND DATE DELIVERED (AND GENETIC ORIGIN IF THAT INFORMATION WAS PREVIOUSLY REQUESTED). DELIVERY, HANDLING, & STORAGE NOTIFICATION CONTRACTOR MUST NOTIFY CONSULTANT 48 HOURS OR MORE IN ADVANCE OF DELIVERIES SO THAT CONSULTANT MAY ARRANGE FOR INSPECTION. PLANT MATERIALS 1. TRANSPORTATION - DURING SHIPPING, PLANTS SHALL BE PACKED TO PROVIDE PROTECTION AGAINST CLIMATE EXTREMES, BREAKAGE AND DRYING. PROPER VENTILATION AND PREVENTION OF DAMAGE TO BARK, BRANCHES, AND ROOT SYSTEMS MUST BE ENSURED. 2. SCHEDULING AND STORAGE - PLANTS SHALL BE DELIVERED AS CLOSE TO PLANTING AS POSSIBLE. PLANTS IN STORAGE MUST BE PROTECTED AGAINST ANY CONDITION THAT IS DETRIMENTAL TO THEIR CONTINUED HEALTH AND VIGOR. 3. HANDLING - PLANT MATERIALS SHALL NOT BE HANDLED BY THE TRUNK, LIMBS, OR FOLIAGE BUT ONLY BY THE CONTAINER, BALL, BOX, OR OTHER PROTECTIVE STRUCTURE, EXCEPT BAREROOT PLANTS SHALL BE KEPT IN BUNDLES UNTIL PLANTING AND THEN HANDLED CAREFULLY BY THE TRUNK OR STEM. 4. LABELS - PLANTS SHALL HAVE DURABLE, LEGIBLE LABELS STATING CORRECT SCIENTIFIC NAME AND SIZE. TEN PERCENT OF CONTAINER GROWN PLANTS IN INDIVIDUAL POTS SHALL BE LABELED. PLANTS SUPPLIED IN FLATS, RACKS, BOXES, BAGS, OR BUNDLES SHALL HAVE ONE LABEL PER GROUP. WARRANTY PLANT WARRANTY PLANTS MUST BE GUARANTEED TO BE TRUE TO SCIENTIFIC NAME AND SPECIFIED SIZE, AND TO BE HEALTHY AND CAPABLE OF VIGOROUS GROWTH. REPLACEMENT 1. PLANTS NOT FOUND MEETING ALL OF THE REQUIRED CONDITIONS AT THE CONSULTANTS DISCRETION MUST BE REMOVED FROM SITE AND REPLACED IMMEDIATELY AT THE CONTRACTOR'S EXPENSE. 2. PLANTS NOT SURVIVING AFTER ONE YEAR TO BE REPLACED AT THE CONTRACTOR'S EXPENSE. PLANT MATERIAL GENERAL 1. PLANTS SHALL BE NURSERY GROWN IN ACCORDANCE WITH GOOD HORTICULTURAL PRACTICES UNDER CLIMATIC CONDITIONS SIMILAR TO OR MORE SEVERE THAN THOSE OF THE PROJECT SITE. 2. PLANTS SHALL BE TRUE TO SPECIES AND VARIETY OR SUBSPECIES. NO CULTIVARS OR NAMED VARIETIES SHALL BE USED UNLESS SPECIFIED AS SUCH. QUANTITIES SEE PLANT LIST ON ACCOMPANYING PLANS AND PLANT SCHEDULES. ROOTTREATMENT 1. CONTAINER GROWN PLANTS (INCLUDES PLUGS): PLANT ROOT BALLS MUST HOLD TOGETHER WHEN THE PLANT IS REMOVED FROM THE POT, EXCEPT THAT A SMALL AMOUNT OF LOOSE SOIL MAY BE ON THE TOP OF THE ROOTBALL. 2. PLANTS MUST NOT BE ROOT -BOUND; THERE MUST BE NO CIRCLING ROOTS PRESENT IN ANY PLANT INSPECTED. 3. ROOTBALLS THAT HAVE CRACKED OR BROKEN WHEN REMOVED FROM THE CONTAINER SHALL BE REJECTED. PLANT INSTALLATION DETAILS AND NOTES SCALE AS NOTED NOTES: 1. PLANTING PIT SHALL NOT BE LESS THAN (2) TIMES THE WIDTH OF THE ROCT BALL DIP. 2. LOOSEN SIDES AND BOTTOMS OF PLANTING PIT 3. SOAK PLANTING PIT AFTER PLANTING REMOVE FROM POT OR BURLAP & ROUGH -UP ROOT BALL BEFORE INSTALLINC, UNTANGLE AND STRAIGHTEN CIRCLING ROCTS -PRUNE IF NECESSARY. IF PLANT IS EXCEPTIONALLY ROOT -BOUND. DO NOTPLANT AND RETURN TO NURSERY FOR AN ACCEPTABLE ALTERNATIVE SPECIFIED MULCH LAYER. HOLD BACK MULCH FROMTRUNKSTEMS FINISH GRADE REMOVE DEBRIS AND LARGE ROCKS FROM PLANTING PIT AND SCARIFY SIDES AND BASE. BACKFILL WITH SPECIFIED SOIL. FIRM UP SOIL AROUND PLANT. 0_ TREE AND SHRUB PLANTING NOTES: 1. PLANT GROUNDCOVER AT SPECIFIED DISTANCE ON -CENTER (D.C.) USING TRIANGULAR SPACING, TYP. 2. LOOSEN SIDES AND BOTTOM OF PLANTING PR AND REMOVE DEBRIS 3. LOOSEN ROOTBOUND PLANTS BEFORE INSTALLING 4. SOAK PIT BEFORE AND AFTER INSTALLING PLANT SPECIFIED MULCH LAYER. HOLD BACK MULCH FROM STEMS Scale: NTS SOIL AMENDMENTS AS SPECIFIED GROUNDCOVER PLANTING Scale: NTS NOTES: 1. INSTALL HARDWOOD CUTTINGS DURING THEIR DORMANCY. DO NOT ALLOW THEM TO DRY OUT. 2. CUTTINGS SHALL BE � TO 1' IN DIAMETER OR APPROVED EQUIVALENT. 3. INSTALL TO MIN. 213RDS DEPTH INTO SOIL. USE TRIANGULAR SPACING. SEE PLANTING SCHEDULE FOR SPACING. 4. INSURE THAT BUDS ARE POINTING UP. 5. FIRM UP SOIL AROUND INSTALLED CUTTING. S. WATER AFTER PLANTING AND BEFORE MULCHING. MINIMUM TWO LIVE BUDS EXPOSED ABOVE GROUND. TAMP SOIL AROUND CUTTING, ENSURE NO AIR POCKETS m i 7 SPECIFIED MULCH LAYER zo TO G FINISH GRADE SOIL AMENDMENTS AS Z CNi T I SPECIFIED I _ O - j �1 I F FORM PILOT HOLE W/ROCK BAR, REBAR OR OTHER rn PLAN INGTOOL. DONOT -) I h HAMMER OR POUND IN CUTTINGS UNLESS APPROVED f BY RESTORATION SPECIALIST. ANGLE CUT AT BASE 3 LIVE STAKE PLANTING Scale: NTS DRAFT NOT FOR CONSTRUCTION O C'ml;hFThe wmm�Ca mny THE WATERSHED COMPANY 750 Sixth Street South Kirkland WA 98033 p 425.822.5242 www.watershedco.com Science & Design �U W N W M Q U v Ica O ' Lrt� PLqV U Q LLI } �¢ w a ° LU U) (/ZJDLLI Z N 0 W w lC= > L7 LL" G a w 1:It aY s�LU ° Q OU a UA z O V5 J m w SHEET SIZE: ORIGINAL PLAN IS 2T z 34'. SCALE ACCORDINGLY. PROJECT MANAGER: HM DESIGNED: GJ DRAFTED: LV CHECKED: GJ, AR JOB NUMBER: 140809 SHEET NUMBER: W7 OF 8 Executive Summary This plan serves as a restoration plan for proposed temporary Impacts to Coke Creek, wetland, steep slope, and butforareas associated with stabilization of a sourer trunk line That crosses Cold Creek in the City of Federal Way. Goals and Objectives Goal: Restore habitat functions that may have been Interrupted due to temporary impacts to wetland, stream, and steep slope critical areas and their buffers. Objectives: 1. Restore soils removed or compacted along equipment access and staging area at north end of construction area. 2. Establish dense and diverse native tree, shrub, and groundcover vegetation where damaged during construction. 3. Remove and control invasive weeds from restoration areas. Performance Standards The performance standards (PS) listed below will be used tojudge the success of rho plan over time. If the standards are met at the end of the five-year monitoring period, the restoration site will be considered successful and the project will have met all critical area permitting obligations. PS 1. Soils: a. Tomporarily-placed sand, gravel, hog fuel, and/or other fill materials will be absent from equipment aodass and staging area at north end of oomstruclion area. b. Soils will be decompacted prior to planting. c. Soils will be amended with compost prior to planting. PS 2. Survival/diversity: a. 100% survival of all woody plantings at the end of year one. This standard maybe met through establishment of Installed plants or by replanting as necessary to achieve the required numbers. b. 80%survival of all woody plantings at the end of year two. This slandehf may be mol lh=gh establishment of installed plants or by mplandrrg oa necessary to achieve the required numbers. Survival beyond year two Is dirttcu8 to track. Therefore, a diversity standard is proposed In place of survival (below]. Areas planted entirety with live cuttings, or dense grwntlmveNemergeni plantings, shall not be held to lho 80%su4vlvaI standard. Anystxh areas that exhibit widespread m0rt00ty shall be re -evacuated by the restoration specialist to ascertain the site -specific viability of the cuttings. PS 3. Native woody vegetation cover: a. Achieve at least 60% cover of native woody species by the end of Year 3. Volunteer species may count towards this standard. b. Achieve at least 80% cover of native woody spades by the end of Year 5. Volunteer species may count towards this standard. PS 4. Diversity: a. Establish at least 1 native tree spades, 5 native shrub species, and 2 native groundcover by the end of Year 5. PS 5. Invasive species standards: a. No more than 10% cover of invasive species in any of the planting areas, in any monitoring year. More than 5% cover of invasive weeds in any year will trigger maintenance weeding. As -built Plan An as-bullf plan will be prepared within 30 days of gubsMatially complete construction of the: resloralion area. The as•built plan will document subslamia conformance with these Paris and also will disclose any subs6luOorm or other norocrilical deparNm9. The as.buRt plan wHi establish baseline plant instatladon quanlilies (based on sample courts or invoices). and photo points That will be uGed throughorrt the monitoring period to measure Ire performance standards over tlme. The as -built documanladon should in dude a markup of the ofigirml plan haling any departures, plus the location of photo points. MITIGATION PLAN NOTES SCALE AS NOTED Monitoring Methods This monitoring program is designed to track the success of Ilwa fest=l ion site over time by measuring the degree to which the performance standards listed above are being met. Monitoring shall occw twice annually for five years. A spring mordloring visit shalt mwrd necessary reVowing, weeding, invasive control, and other mainionanae need- 'rho Constructed In -stream habitW features Including the log sVutturazwit also be lrm"d in the spring once each year for five years fodowlno cormimction to Identify any maintenance or repairs that would naed ro be done during the upcoming low -flow season. Steam channel, stream bank, and log slruchrm functiunfng would be assessed. Examples of swam channel malMenancoor repair might indude slabilizing any eroding 51mambanks or socudng any logs mat may threaten to be washed d ownslroam. The Restoration Sped Dust will notify the owner and/or maintenance crews of necessary early season maintenance. The second visit shall occur in late summer or fall and contain the bulk of the monitoring work. The annual monitoring report will relate the following information: 1. General summary of the spring visit. 2. First -and second -year counts of surviving and dead/dying woody plants. 3. Estimates of native woody species cover in restoration areas using the cover class method. 4. Estimates of invasive species cover in restoration areas using the cover class method. 5. Counts of established native species to determine site diversity. 6. Notes and/or sketches of invasive weeds or bare areas. 7. Photographic documentation from established reference points. 8. Intrusions into the planting areas, vandalism, trash, and other actions detrimental to the overall health of the restoration area. 9. Recommendations for maintenance in the restoration area. Construction Notes and Specifications Note: Specifications for items 1n bold can be found under "Material Specifications and Definitions." Note: The Watershed Company personnel [(425) 8225242], or other persons qualified to evaluate environmental restoration projects, shall monitor. 1. All site preparation. a. Invasive weed management and soil preparation. 2. Plant material inspection. a. Plant material delivery inspection. b. Plant installation inspection. General Work Sequence 1. Following completion of construction, remove any temporarily -placed fill materials and associated underlying fabric from equipment access and staging area. 2. Remove all invasive weeds and weed roots from entire planting area as directed by the Restoration Specialist Avoid damage to existing native vegetation. 3. Soil preparation and planting sequence shall vary by planting area type- Refer to W6 Restoration Planting Plan for detailed soil preparation and planting instructions by planting area type. 4. Install vegetation perthe planting plans and planting details. 5. All plant installation shall take place dudng the dormant season (October 15 through March 1), during frost free periods, for best survival. 6. Install blanket application of wood chip mulch in restoration areas to depth of 4 inches. To prevent rot, pull mulch back from stems of installed plants. Note: to the extent that wood chip mulch meeting specifications has been substituted for hog fuel to provide construction access, and as long as it remains free from contamination and debris, it may be reused as mulch. Maintenance This site will be maintained for five years following completion of the construction. Specifications it bold can be found under "Material Specifications and Definitions." 1. Replace each plant found dead In the summer monilorktg visits during frost4ee periods only in am upcoming fall dormant season (October 15 to March 1) for 111a first two monitoring years. Replace plants as directed In subsequent monitoring reports. 2. Follow the recommendations noted in the spring monitoring she visit. 3. General weeding for all pleated areas: a. At least twice yearly, remove all competing grass and weeds. Including ropm, from beneath each Installed plant and any desirable voiurteor vegetation to a distance of 18 inches from the main plant store. Weeding should occur at least Wce during the spring and summer. Frequent weeding wlll result in lower mortality and Tower plant replacement costs. b. More frequent weeding may be necessary depending on weed conditions that develop after plan installation. c. Do not weed the area near the plant bases with string trimmer (weed whacker/weed eater). Native plants are easily damaged or killed, and weeds easily recover after trimming. 4. Apply slow release granular fertilizer to each installed plant annually in the spring (by June 1) of Years 2 through 5. 5. Mulch the weeded areas beneath each plant with wood chips as necessary to maintain a 4-inch4hick mulch layer and keep down weeds. Contingency plans and adaptive management These plans have been prepared to ensure surmoss to fhe maximum praclicahle extent- OusEry and consistency of installation, maintenance. N%athar pattern ammar 0s. wildlife damage, vandalism and other factors can singly or in oombination change condltionsat miligaWn sites and abed avontual success of these prams. Therefore, adaptive management shoud W employed to evaluate problems as they &nee and daveopfia4l6ble and practical solutionx FXemples can include but are not l0kid to plant substimlon, changes in target vegetation dosses, soil amendme 1, and regrading. As a last resort, medtficadon of performance standards can W necessary. Any actions InvaMng major departures from the Original plan or goals and performance standards should be discussed and agreed to with regulatory agencies ahead cif Implememafion. Material Specifications and Definitions 1. Compose Compost shall meet WSDOT Standard Specications fOfRosd, Bridge, and Municipal Consumvion. 9-14.4(8) for Fine Compost. Amendment quantity required for construction: 7.5 cubic yards. 2. Fertilizer: Slow release, granular fertilizer such as Osmocotel or equal product. Most retail nurserioscany INS product. Fallow mararfadurefs insVWlons far application, i(aep fertilizor in a weather -light conmlrnar while on site. Noma that fenllizer Is to he applied only in years two. three, four and five and not En the first yaar. Fertilizer shall riot be placed to inundated areas. 3. Restoration Specialist: The Watershed Company personnel [(425) 822-5242] or other persons qualified to evaluate environmental restoration projects. 4. Wood chip mulch: Wood chip mulch shall meal WSDOT Standard Spocificafwns for Road, Bridge, and Municipal Construction for Bark or Wood Chips as defined by 9-14A(3} 'Bark or wood ship mulct shall be derived from Douglas -Fr, pine, or hamlodk species. It shall not contain resin, tannin. orofhercompounds in quaMiiles that would bedeutmental to ptanl fife. Sawdust shall not be used as mulch.' Quantity required: 145 cublc yards. Bark or wood chips when tested shall be according to WSDOT Test Method T 123 prior to placement and shall meet the following loose volume gradation: Sieve Size Percent Passing Minimum Maximum 2" 95 100 No.4 0 30 DRAFT NOT FOR CONSTRUCTION o covtpnh-rnn wx.ace ranoemr THE WATERSHED COMPANY 750 Sixth Street South Kirkland WA 98033 p 425.822.5242 www.watershedco.com Science & Design WC L) �Pak0�_ WOcn HJ �jG?WJ Q � J l-- cn P4 _1 I Z N �TW]Z QM PG �-I X _ U`4aw Q�� Y al� g O N CM (D 0 00 a) Q J Q X W 0 W LL N d' X 0 M i1 SHEET SIZE: ORIGINAL PLAN IS 22' x 34'. SCALE ACCORDINGLY, PROJECT MANAGER: HM DESIGNED: GJ DRAFTED: LV CHECKED: GJ, AR JOB NUMBER: 140809 SHEET NUMBER: W8 OF 8