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15-105729
FILE January 25, 2016 Jim Ferrell, Mayor Steve Sullivan DEVCO / Heartland Construction 11100 Main Street, Suite 301 Bellevue, WA 98004 RE: File No. 15-105729-00-AD; REQUEST TO CONSTRUCT ROCK SWALE IN WETLAND BUFFER Kitts Corner Multifamily, 1201 South 3361h Street, Federal Way Dear Mr. Sullivan: The City of Federal Way has received your October 8, 2015, request for approval of an already - constructed rock swale in the wetland buffer at the Kitts Corner Apartments site. The proposed rock swale is approximately eight feet wide by 100 feet long. The proposal is being reviewed under the Federal Way Revised Code (FWRC) provisions for an essential public facility, public improvement, or public utility in a wetland buffer. The rock Swale conveys off -site generated stormwater runoff that passes through the Kitts Corner site. The rock swale is proposed within a portion of wetland buffer, which was previously disturbed prior to development of the Kitts Corner Apartments site, and this wetland buffer area is presently being enhanced and restored via a City approved wetland buffer enhancement and restoration plan. The City's third party wetland consultant, Landau Associates, has reviewed the wetland buffer intrusions for the proposed rock swale as discussed in their December 8, 2015 and January 19, 2016 memorandums. With authority set forth in Federal Way Revised Code (FWRC) 19.175.040(3), the Department of Community Development hereby approves your request based on the following conclusions: CONCLUSIONS The following conclusions are based on decisional criteria set forth in FWRC 19.175.040(3). 1. The improvement must traverse the buffer as no feasible or alternative location exists based on an analysis of technology and system efficiency. The location of the rock swale within the wetland buffer is the result of existing patterns of stormwater through the wetland buffer. The rock -lined Swale through the wetland buffer,appears to correlate with the general width ofprior erosion and channeling through the wetland buffer. Intrusion into the wetland buffer to control stormwater runoff in this location is unavoidable due to existing grades, location of the wetland and pre-existing stormwater runoff patterns. 2. The specific location and extent of the intrusion into the buffer must constitute the minimum necessary encroachment to meet the requirement of the public facility. 33325 8th Avenue South, Federal Way, WA 98003-6325 (253) 835-7000 www.cityoffederalway.com Mr. Sullivan January 25, 2016 Page 2 The Talasea Consultants' October 8, 2015, and CPHConsultants' letter dated December 22, 2015, provide adequate findings that the rock swale dimensions are the minimum width and length necessary to convey the pre-existing stormwater runoff being discharged at the site from the existing 24-inch culvert at the top end of the subject rock swale. Minor adjustment and modification of the rock swale as recommended in the Talasaea report must be implemented by the applicant. The Federal Way Public Works Department has reviewed and approved the design of the rock Swale. If you have any questions regarding this decision, please contact Jim Harris, Planner, at 253-835-2652 or jim.harris@cityoffederalway.com. Sincerely, ff�� Michael A. Morales Community Development Director r: Jim Flarris, Planner Ann Dower, Senior Engineering Plans Reviewer Steve Quarterman, Landau Associates, 130 2od Avenue South, Edmonds. WA 98020 David Teesdale, Talasaea Consultants Inc., 15020 Bear Creek Road, Woodinville, WA 98077 IS-105729 Doc I D 72013 Technical Memorandum TO: Jim Harris; Planner City of Federal Way Development Services Department FROM: Steven Quarterman DATE: January 19, 2016 RE: Peer Review Response to Review Comments Kitts Corner Multifamily Rock Swale in Wetland Buffer Federal Way, Washington Introduction The City of Federal Way (City) is requiring a construction report from the applicant developing the Kitts Corner Apartments project as a result of wetland buffer impacts that have occurred during construction that were not included as a component of the approved wetland buffer mitigation plan. The impacts are associated with a 100 foot long rock swale that was constructed within the full width of a wetland buffer. This technical memorandum provides Landau Associates' peer review comments related to the applicant's consultant's submittal regarding installation of the rock swale. Comments provided in this technical memorandum are based on applicant response to Peer Review comments provided in a draft memorandum dated December 8, 2015 (Landau Associates 2015). This memorandum provides additional peer review comments based on our review of: ■ December 22, 2015 Responses to Review Comments Kitts Corner Multifamily — Rock Swale in Wetland Buffer prepared by CPH Consultants (December CPH Response) • January 11, 2016 email RE: Kitts Apts Rock Swale (TAL 1422) prepared by CPH Consultants (January CPH Response). The purpose of this peer review is to provide a professional opinion regarding applicable regulatory requirements of the Federal Way Revised Code (FWRC) Chapter 19.175.040.3, which, in part, allows essential public facilities/utilities in wetland buffers when the location and extent of the intrusion constitutes the minimum necessary encroachment to meet the requirements of the public facility or utility. Landau Associates understands that the City has engineering staff available for review of applicable stormwater design requirements. Peer review comments include: 1. Item 1 in the December CPH Response provides summary of percent grades and expected velocities in the area of the channel. These conditions are elaborated in the January CHP response. Landau Associates defers to the City regarding comments associated with channel/outfall protection in relation to applicable engineering standards for site conditions present. a LANDAU ..: L ASSOCIATES 130 2nd Avenue South • Edmonds, Washington 98020 • (425) 778-0907 Landau Associates 2. Item 2 in the December CHP Response provides clarification of the previous existing outfall prior to site development. The previous location of the outfall was not clear based on review of plan information provided to Landau Associates. CPH response presented in Item 2 is adequate as provided. 3. Item 3 of the December CPH Response implies competing standards for development, in that the project has visual access requirements that may conflict with buffer requirements. Response provided indicates that woody plantings are not recommended in the swale due to visual access requirements. Buffer mitigation plans dated March 3, 2014 as provided to Landau Associates include woody plantings in area between the wetland and the raised overlook platform in the vicinity of the rock swale. Response to Item 3 does not address herbaceous ground cover, but is addressed in item 4c. Landau Associates assumes the City will address potential conflict between visual access requirements and buffer requirements. 4. Item 4a includes reference to response to Item 1. Original comment provided in the December 8 peer review comments identifies that a 7 foot wide channel is below applicable minimum criteria, and that justification forthis width is needed. While it is preferable to minimize impacts to the buffer to extent practicable, Landau Associates also understands that minimum design standards need to be satisfied. Landau Associates defers to the City regarding comments associated with channel/outfall protection in relation to applicable engineering standards for site conditions present. 5. Response to Item 4c indicates "It may be possible to plant some herbaceous materials, such as sedges or rushes, at the point where the Swale discharges to the wetland", and the January 2016 CPH Response indicates "...the rock goes basically to the edge of the delineated wetland edge...". It is not clear what conditions are present that make it "possible" to plant, but Landau Associates recommends that plantings be installed in areas of the buffer that are exposed ground (i.e., no rock cover) where the swale discharges to the wetland. Landau Associates concurs that herbaceous species may not be capable -of growing through the rock in the swale, specifically in instances where rock is layered and interstitial space between rocks is not conducive to planting (i.e., unobstructed path from rock surface to underlying soil allowing adequate space for plantable material). Peer Review Response to Comments Kitts Corner Multi -Family January 19, 2016 Landau Associates Limitations This technical memorandum has been prepared for use by the City of Federal Way in evaluating applicant responses to unapproved buffer intrusion associated with the Kitts Corner Multifamily development. The focus of this review was to evaluate if the intrusion into the buffer constitutes the minimum necessary encroachment to meet the requirements of FWRC 19.175.040.3. The purpose of the review was to also assess the adequacy of the submitted documents for compliance with City requirements as promulgated in FWRC 19.175.040.3 and conformance with conventionally accepted critical areas practices. We appreciate this opportunity to be of service to the City. Please contact us if you have any questions or if we may be of further service. LANDAU ASSOCIATES, INC. i �L Steven Quarterman. Associate Ecologist SJQ/SRW/kes [\\EDMDATA01\PROJECTS\238\069\R\RESPONSE TO COMMENTS TMVITTS PEER REVIEW TM_FINAL-011916 DOCX] Peer Review Response to Comments Kitts Corner Multi -Family January 19, 2016 December 31, 2015 Mr. Steve Quarterman Landau Associates Inc. 130 2nd Avenue South Edmonds, WA 98020 Jim Ferrell, Mayor Re: File #15-105729-00-AD; REQUEST FOR THIRD PARTY REVIEW Kitt's Corner Apartments Wetland Buffer Intrusion, 1201 S. 336t' St., Federal Way Dear Mr. Quarterman: Please find enclosed the December 22, 2015, CPH Consultants response to your December 8, 2015 review. I was unsure if CPH sent this response directly to your office, so I am mailing a copy just to make sure you received this response. After you review the CPH response, I would like to talk to you to discuss. I have limited office hours. E-mail me to arrange a time to discuss by phone on a Monday, Tuesday or Thursday morning. I can be reached at 253-835-2652, orjlm.harris@cityoffederalway.com. Sincerely, Jim Harris Planner enc: December 22, 2015 CPH Letter 15-105729 Doc, 1 D 71869 33325 8th Avenue South, Federal Way, WA 98003-6325 • (253) 835-7000 9 www.cityoffederalway.com February 19, 2016 City of Federal Way Community Development 33325 8"' Avenue South Federal Way, WA 98003 Attn: Jim Harris RE: INVOICE FOR THIRD PARTY REVIEW SERVICES KITT'S CORNER APARTMENTS WETLAND BUFFER INTRUSION CITY OF FEDERAL WAY, WASHINGTON Dear Jim: LANDAU ASSOCIATES RECEIVED BY COMMUNITY & ECONOMIC DEVELOPMENT DEPARTMENT FEB 2 5 2016 Attached you will find our invoice for the above -referenced project, for the period ending January 30, 2016. During the billing period, representatives from Landau Associates accomplished the following tasks: • Field review of project. • Preparation of peer review technical memorandum. ■ Preparation of peer review technical memorandum based on applicant response to initial peer review technical memorandum. • Performed project management activities, including project setup and client coordination activities. We appreciate the opportunity to provide peer review services for this project. Please contact me if you have any questions or comments regarding the attached invoice. LANDAU ASSOCIATES, INC. Steven Quarterman Associate Ecologist SJQ/ 2/23/16 \\edmdataol\projects\238\069\M\Febl6_Invoice FedWayKitts_docx kv 1 r A � WL tl V ENVIRONMENTAL I GEOTECHNICAL I NATURAL RESOURCES 130 2nd Avenue South • Edmonds, WA 98020 • (425) 778-0907 • fax (425) 778-6409 • www.landauinc.com EDMONDS (CORPORATFI . CFATPF . TA! ntIA . ,-.—. _ ____ 0 Jim Harris City of Federal Way P.O. Box 9718 Federal Way, WA 98003-9718 Project No. 0238069.010 Kitt's Corner Apartments Wetland Buffer Intrusion Third Party Review Services Professional Services through January 302016 Professional Personnel Principal Wright, Steven Associate Quarterman, Steven Senior Project Engineer Bergseng, Allison Project Coordinator Ortiz, Jill Schultz, Kristi Totals Total Labor Unit Billing Mileage Total Units BUDGET LIMITS Total Billings Budget Remaining Budget Billings to Date Labor Unit Totals LANDAU ASSOCIATES February 23, 2016 Project No: 0238069.010 Invoice No: 0036705 Hours Rate Amount .75 221.00 165.75 13.25 181.00 2,398.25 .75 147.00 110.25 .25 97.00 24.25 2.00 97.00 194.00 17.00 2,892.50 2,892.50 84.0 miles @ 0.575 48.30 48.30 48.30 Current Prior To -Date 2,940.80 0.00 2,940.80 6,600.00 3,659.20 TOTAL DUE THIS INVOICE $2,940.80 Current Prior Total 2,892.50 0.00 48.30 0.00 2,892.50 48.30 �d O�}-- 2,940.80 0.00 2,940.80 n REMIT PAYMENTS TO: I► V ')) ;! I 1 130 2nd Avenue South 1 1 Edmonds, WA 98020 425-778-0907 i�N CONSULTANTS December 22, 2015 Mr. Steven Quarterman Associate Ecologist Landau Associates 130 2^d Avenue South Edmonds, WA 98020 RE. Kitts Corner Mullifamily —Rock Swale In Welland Buffer Federal Way, Washington CPH Project No. 0024-12-017 Responses to Review Comments Mr. Quarterman, Silo Plan -ling Civil Engineering Land Use Consulling Projectftagenent RESUBMITTED DEC 2 3 2015 CITY OF FEDERAL WAY CDS This letter and the following enclosed information comprise the responses to the rock swale within the wetland buffer for the Kitts Corner project: 3 — Additional copies of ibis response letter 3 — KCSWDM Section 4.4-1.A 3 - Swale Calculations 3 — Exhibit A - Photos of Existing Swale 3 -- Interpretive Sign The importance of Wetlands The letter is prepared in response to the City's peer review comments provided in your December 8, 2015 letter. Specific responses to each of the review comments are as follows. Peer Review Comments 1. The October CPH Response includes Table 4.2.2.A Rock Protection at Outf ails of the King County Surface Water Manual, and provided the calculated outfall velocity (i.e., 4.6 feet (ft]/second), the rock lining material, 8-ft outfall protection width, and 1 ft depth of rock appears appropriate 1. However, the King County Surface Water Manual indicates a minimum length of 8 ft. Landau Associates recommends that the City be provided feasibility onalysis of reducing the length of the rock lined swale to the minimum criterion or an intermediate length between the minimum criterion and the full width of the buffer. Response: The rock provided at the outlet of the 24" pipe meets The requirements of the minimum dimensions and depth to meet the outfall requirements of King County Surface Water Design Manual (KCSWDM) Fable 4.2.2.A. These are minimum dimensions as noted in subnote # 1. The other design consideration is stabilizing and protecting the buffer from the signifr'cant flows discharged to the site from the existing upstream basin as described in our previous response letter dated October 5, 2015. Allowing these major stormwater flows To disperse through the buffer without providing additional erosion protection would create signihcamt sediment transport to the welland. The gradient between the ouffall pipe and wetland is approximately 4%, and an expeded velocity of 4.5 feet per second along the rack -fined swale was calculated per our previously provideed calculations. Table 4.4.1.A of the KCSWOM shows the required channel protection for a design velocity between 0-5 feet per second may use gross -lining or bioengineered lining. However, the conveyance calculalion For a grass- firoed,channel would have a reduced Manning's roughness coeffrsient, which would result in a velocity greater than 5 feet per second (as shown in the enclosed calculations) and require a rock type lining per Table 4.4.1.A. We recommend the rock -lined swap: is rnainthzined through the buffer given grade, i 1431'11116m Road NE, 5oile 120 • Redmond, W,A 98052 • Phorr ,425128i•2390 • Fay: [4251285,2"s89 vWV plicawrantskoiu Kitts Corner Multifamily (Rock Swale in Wedand Buffer) December 22, 20 i 5 Response to Peer Review Comments Page 2 of 3 CPH No. 0024-12-0017 potential for significant sformwater flows, and sediment transport if the storroWater flows are not conveyed directly to the flat area adjacent to the wetland, Phofos (see Exhibit A) taken during a storm event this last November and December are attached to show the amplitude of runoff entering the site and supports our recommendation to maintain the rock -lined swore to protect the wetland buffer. 2. The October Talasaea Response references riprap placed at the end of the outfall as part of the original design that was unable to dissipate flows from the outfall. Per the King County Surface Water Manual, riprap is specified as outfall protection for design flows higher than those calculated for the project discharges. The July Talasaea Response Includes a photograph of the outfall and erosion, and it is not evident from the photograph if the riprap has been removed or was washed downslope as a result of storm discharge from the outfall. It is likely that conditions during construction may have exacerbated erosion observed following grubbing activities. Landau Associates recommends that the City be provided details of temporary erosion and sediment control best management practices used during construction, and feasibility analysis of temporary erosion sediment control best management practices combined with plantings and minimum criteria provided In the King County Surface Water Manual as an alternative to Installation of a rock lined swale the full width of the wetland buffer. Response. The original discharge of the City's storm outfall was adjacent to South 3361h Street within an area of fairly Hat grade. The new outfall has less than half the distance to the existing wetland and is within an area of greater slopes and as such does not function the some as was visually, evident during construction, The sale use of temporary BRIP's and erosion control measures to stabilize the buffer will not prevent significant erosion to the buffer by the substantial flows discharged to the site. 3. The October CPH response indicates that "...once vegetation is established within the buffer and Swale it will function similar la the pre -development condition". The October Talasaea Response includes a planttng plan, but does not include planting as implied by the October CPH response. We assume: the swale cannot be planted due to size and depth of rock present. !landau Associates recommends the City request evaluation of the minimum outfall protection standards to maximize the amount of plantable area downstream of proposed outfall protection (e.g., limiting rock protection from B to 12 ft in length downstream of the outfall, per applicable design criteria, and adding plantings within the remainder of the area between the rock protection and the wetiond). Response: See response for Item # I. Talasaea has also incorporated black hawthorn, salmonberry, red -osier dogwood and Nootka rose along the edges of the rock4ined swale. These shrubs will help provide shading and cooling of the outfall discharge and ho6itorl for various urbanized species of birds orid small mamnials. Talasaea does not recommend planting within the rock -lured swale since visual access to the wetland will likely be impaired. Visual access to the wetland from an already approved and constructed trail and overlook was part of the overall design plan for The passive open space required for the development. in addition, we designed an educational interpretive sign to be installed on the overlook., immediately adjacent to the swale, that indicates collected runoff from city owned parks will flow down the built rack -fined swale to the wetland as part of the "hydrologic cycle" that occurs (PDF of the approved sign is attached). This interpretive sign has already been reviewed, approved, fabricated and installed as part of the rniligation plan. 4. The October Talasaea Response includes list of remedial actions, which is provided below (italics) with our response following each: csj The rock -lineal Swale be reduced to be no less fhan seven feet wide at its narrowest, and shall not exceed TO feet wide at its widest point to create a more sinuous channel_ The excess rock wilf be removed from the buffer. " As mentioned above, Landau Associates recommends evaluation of the minimum criteria for rock protection at outfalls consistent with the King County Surface Water Manual be provided. Based on standards provided in the King County Surface Water Manual, it is our understanding that a minimum B ft wide channel is required; therefore, a 7 ft wide channel is below applicable minimum criteria and justification Kilts Corner Multilanuly (Rock Swale in Wetland Buffer) Response to Peer Review Carnments CPf-1 No. 0024-12-0017 December 22, 2015 Page 3 of 3 for channel width exceeding 8 £t should be provided. Response: See response for Item ## 1. b} The existing rock along both sides of the 24-inch culverf shaft be removed so that the start of fhe rock fining is generally flush with the termfirus of the pipe. ■ Landau Associates concurs with This action. cj Place two boulders between the pipe's oulfaff point and the existing down logs to help attenuate flow velocities and energy and deflect flow away from the swale's left bank. Landau Associates concurs with action to dissipate flows. However, strategies for incorporating plantings and/or plontable materials that will intercept flow should be evaluated to increase habitat and water quality functions in the buffer. Response: Talasaeo does not concur with planting shrubby material within the rock -fined swale due to the potential of blocking visual access from the interpretive overlook to the wetland. It may be possible to plant some herbaceous materials, such as sedges or rushes, of the point where the swale discharges to the wetland. Other herbaceous species may not he capable of growing through the rock in the swale. d} Plant the new edge of the rock -lined swale with native shrubs, such as red -osier dogwood, black hawthorn, and salmonberry, to increase bank protection above the rock $wale, help disguise the outfall pipe and to provide habitat. a Landau Associates concurs with this action. Please contact me directly at (425) 285-2392 or by e-mail at jar�r iet_cohconsultants.cam if you have questions or need any additional Information to complete your review and approval of the project. Your prompt response is appreciated. Thank you. Sincerely, CPH Consultants la ie Schroeder,PE V �e President Enclosures ca Jim Harris (City of Federal Way) Ann Olsen & Dave Teesdale, Tolasaea Consultants, Steve Sullivan & Tom Smith, DevCa, Inc_ copy to file 4.4.1 OPEN CHANNELS — DESIGN CRITERIA TABLE 4.4.I.A CHANNEL PROTECTION Velocity at Design REQUIRED PROTECTION Flow (fps) Greater Less than Type of Protection Thickness Minimum Height than or equal to Above Design Water Surface 0 5 Grass lining N/A Or Bioengineered lining 5 8 Rock lining(') 1 foot 1 foot Or Bioengineered lining 8 12 Riprap (2) 2 feet 2 feet 12 20 Slope mattress gabion, Varies 2 feet etc. (') Rock Lining shall be reasonably well graded as follows: Maximum stone size: 12 inches Median stone size: 8 inches Minimum stone size: 2 inches (2) Riprap shall be reasonably well graded as follows: Maximum stone size: 24 inches Median stone size: 16 inches Minimum stone size: 4 inches Note: Riprap sizing is governed by side slopes on channel, assumed to be approximately 3:1, Riprap Design10 When riprap is set, stones are placed on the channel sides and bottom to protect the underlying material from being eroded. Proper riprap design requires the determination of the median size of stone, the thickness of the riprap layer, the gradation of stone sizes, and the selection of angular stones that will interlock when placed. Research by the U.S. Army Corps of Engineers has provided criteria for selecting the median stone weight, W50 (Figure 4.4.1.A, p. 4-59). If the riprap is to be used in a highly turbulent zone (such as at a culvert outfall, downstream of a stilling basin, at sharp changes in channel geometry, etc.), the median stone W50 should be increased from 200% to 600% depending on the severity of the locally high turbulence. The thickness of the riprap layer should generally be twice the median stone diameter (D5o) or at least that of the maximum stone. The riprap should have a reasonably well graded assortment of stone sizes within the following gradation: 1.25 <_ DID50 s 1.50 D151D50 = 0.50 DminlD50 = 0.25 Detailed design methodology may be found in the Corps publication EM 1110-02-1601, Engineering and Design — Hydraulic Design of Flood Control Channels. For a more detailed analysis and design procedure 10 From a paper prepared by M. Schaefer, Dam Safety Section, Washington State Department of Ecology. 2009 Surface Water Design Manual 1/9/2009 4-57 Kitts Corner Swale Calculations Open Channel Calculations Trapezoidal Channels Project: Kitts Corner Description: Open Channel Flow (Grass -Lined Swale) Date: 1-Oct-15 Chezy-Manning Equation Trapezoidal Channel Given: Output: Base Width Depth of Flow Side Slope x Wetted Area Wetted Perimeter Hydraulic Radius Channel Length Elevation drop Slope Manning's n Determine Flow Rate of Trapezoidal Channel 10.00 ft 0.32 ft 3.00 3.54 sq. ft. 12.04 ft 0.29 ft 100 ft 3.70 ft 0.037 ft/ft 0.025 Wetted Perimeter 12.04 ft Wetted Area 3.54 sq ft Hydraulic Radius 0.29 ft Velocity 5.07 fps Design Values of Manning's n Description Base width of Flow line Depth of Flow 1 vertical unit = x horizontal Wetted Area of channel Wetted Perimeter of channel Wetted area/ Wetted perimeter Channel Length Change in elevation Slope of channel Manning roughness constant Conversion 1 cfs = 448.83 gpm Channel Material n Cast Iron 0.013 - 0.015 Galvanized Iron 0.015 - 0.017 Brass and Glass 0.009 - 0.013 Concrete 0.012 - 0.014 Planed timber 0.011 Corrugated metal pipe 0.024 Natural channel, good cond 0.025 Natural channel with stones & weeds 0.035 Very poor natural drainage 0.060 Plastic or PVC 0.009 CPH Project No. 0024-12-017 AF Ikr y _ .. t _s''.�.: �� _ --fit• �i — .�ti sT � ld ' '- . ' - ! r� - ..�� •� _mow. _ qb ft IPA !:�-� .. •.p• , 1 ire ,. ^•ice � :�J:-. _ _1�t - -''� `� _ Exhibit A Kitts Corner Multi -Family Outfall Photos F December 2015 2 CPH Project No. 0024-12-017 The importance of wetlands A wetland by any other name: Bogs, swamps, ponds, marshes, wet meadows, estuaries... whatever you call them, they provide many ecological and aesthetic benefits. They help purify the water we depend upon for drinking and other purposes, slow floodwaters to help stop erosion, provide habitat for numerous forms of terrestrial and aquatic life, and create places of quiet beauty in our busy lives. Before the value of wetlands was understood, over half of all the wetlands in the US. alone had been destroyed by clearing land for our use. In response, Congress began passing laws in 1977 to slow and prevent the net loss of natural wetlands. Those that are lost must be compensated for through the development of new wetlands; a process called wetland mitigation. ri �' ' } '. �`''` ? � h• � I '�'� �, ,ter.. - �. _: r _ �� � �: s� ILI `� u, ; � �' a't��j �;' ,'J([4 �, �r � ��� I ����,{l p_ ,�;��1 �,tii�` �f�1�'l��;t�r'��3�;��� �•r� ��,'` � � � I �� �j - `' �4i �� ���, , n �; n• .i r iriiis�.._ . �� �. � � ,.i �. F y; J�,�• r �� � III �j�•�}' `�� iy• . t� +' `�j�' .� .'Ur ; �•}�j' L �;•�I.:+•'` r iy���l11k� � �`• _� ,3. ■ hh .ate �Y•'�4���• `A� ,� \ . ri7: �1� � E • ��t t�� f���� • � ; ����; ���i 1. � l; ±�;�, II �' •�i�;� . , . 1�,!���� } � 1 _- i�r,s'lll�}�llr++; iI`� 51A Did you know? One acre of wetland can store 1-1.5 million gallons of floodwater. What IS a wetland? simply put, these are places entirely covered by water at least part of the year. Wetland types vary greatly depending upon location, climate, topography and other factors. This wetland has water all year round, making it prime habitat for resident as well as migratory waterfowl. Look for mallards, Canada geese (many are year-round residents), great blue herons, wood ducks and green -winged teals (spring into late fall migrants). Red -winged blackbirds feed and nest in cattails and bulrushes around wetland margins. Amphibians, raccoons, beaver r - and many species of insects depend on �t' wetlands for food and shelter. ,d; Male red -winged blackbird Mallard ducks nest I" in ground cover plants nearshore. Get involved! Not everyone can be directly involved in reconstruction but we can all participate in keeping these areas healthy for wildlife, ourselves and for future generations by: Staying on trail surfaces only. Native plants need time to become established. Keep dogs on a leash and pick up and dispose of pet waste properly. Leave nothing behind. 'Pack it in, Pack it out.' Please don't feed the animals. Wildlife needs to stay wild. Hydrologic Cycle (How water is recycled through the watershed) Transpiration (trees/plants release water into the atmo, Evaporation Precipitation �{ t ti -1-.7 Stream headwaters „Y snow melt ' Tlreanrs �Riiurr or �.�� , � Groimdivater Srnrl Ar�nifrr Watersheds, the big picture: A watershed includes all areas of land draining into a common body of water. Water is recycled though the Hydrologic Cycle which carries with it the consequences of our collective actions related to runoff. Water runoff from the West Hylebos Creek Drainage Basin, which includes Celebration Park and many other properties, drains through this rock Swale to the wetland, providing stormwater collection and storage during winter rains. Water seeps gradually into the soil over time, trapping sediments and pollutants before reaching rivers and streams where salmon spawn and rear. fa ,1, Jim Ferrell, Mayor November 24, 2015 Mr. Steve Sullivan Devco Inc./Heartland Construction 10900 NE 8[h Street Belleuve, WA 98004 11:,/LE Re: File #15-105729-00-AD; WETLAND CONSULTANT REVIEW ESTIMATE Kitts Corner Multifamily, 1201 South 336[h Street, Federal Way Dear Mr. Sullivan: Enclosed please find the consultant task authorization with scope of work for review of the Kitt's Corner Apartments wetland buffer intrusion. The department's wetland consultant, Landau, was asked to provide an estimate for their review of information prepared by Talasaea. The Landau fee determination summary is enclosed. The normal course of action is for the city to set up an account to be funded by the applicant and drawn down by the work performed by Landau. Please note that if any of the funds are not used, they will be returned to the applicant. A check in the amount of $6,600.00, payable to the City of Federal Way, and signature on the consultant authorization form, must be submitted before the review will begin. Please note, this fee will cover the review of the materials, field review, memorandum, plus one revision review. Any meeting requested by the applicant would occur during Landau's field review. Additional reviews or meetings beyond that will require a supplemental cost and authorization. Following receipt of the signed form and check, I will authorize Landau to begin their formal review. If you have any questions regarding this letter or your project, please contact me at 253-835-2634, or stacey.welsh@cityoffederalway.com. Sincerely, Stacey Welsh, AICP Senior Planner enc: Wetland Consultant Authorization Form Landau Proposed Scope of Services and Cost Estimate City of Federal Way Invoice Uuc. LU. 71493 33325 8th Avenue South, Federal Way, WA 98003-6325 - (253) 835-7000 9 www.cityoffederalway.com r, WETLAND CONSULTANT 2 1)AUTHORIZATION FORM Date: November 12, 2015 City: City of Federal Way Community Development Department 33325 8"' Avenue South Federal Way, WA 98003 Consultant: Steve Quarterman Landau Associates Inc. 130 2"' Avenue South Edmonds, WA 98020 Project: Kitt's Corner Apartments — Wetland Buffer Intrusion 1201 S. 336"' St., Federal Way Parcel #202104-9070 File No.: 15-105729-00-AD Project Proponent: Stephen Sullivan Devco Inc.' 'Heartland Construction 10900 NE 8"' Street Bellevue, WA 98004 425-233-6441 Project Planner: Senior Planner Stacey Welsh stacev.welsl3 @citvoffederal-.va,..com 253-835-2634 Project Background: The applicant is developing the Kitt's Corner Apartments project and during construction there were wetland buffer construction impacts. Third party review of the submitted wetland information is requested. Documents Provided: ■ Memo, from City of Federal Way to CPH & Devco, dated March 10, 2015 • Letter wl I Ix17 drawings of W 1.2 & W2.0, from Talasaea to City of Federal Way, dated July, 20, 2015 • Letter, from City of Federal Way to Talasaea, dated August 20, 2015 • Letter, from CPH to City of Federal Way, dated October 5, 2015 Letter wl I lxl 7 drawings of W 1.0 - W3. I, from Talasaea to City of Federal Way, dated October 8, 2015 + Full size set drawings W 1.0=W3.1 (8 pages), prepared by Talasaea, submitted November 10, 2015 Wetland Buffer Mitigation Plan, prepared by Talasaea, dated March 4, 2014 ■ Copy of Chapter 19.175.040 Task Scope: 1. Review the background materials, submitted documentation and associated data for consistency with the requirements of Federal Way Revised Code (FWRC) Chapter 19.175, "Regulated Wetlands," (NOT recently updated version per Ordinance No. 15-797—the previous version of the FWRC Critical Areas Code applies in this situation) especially: a. Chapter 19.I75.040.3, "Structures, improvements and land surface modification within regulated wetland buffers" 2. Conduct site visit as necessary. 3. Provide written response to findings, recommendations, and request additional information from applicant if needed. 4. Possible meeting with applicant's wetland biologist. 5. Review of resubmitted/corrected documents as needed. b. Project management as necessary if additional land use review is required. Task Cost: Not to exceed $ Jwithout a prior written amendment to this Task Authorization. Acceptance: su City of Federal Way Staff 1 i 2,.E :': s Date ' Date Applicant Date LANDAU ASSOCIATES November 20, 2015 City of Federal Way Community and Economic Development 33325 8th Avenue South Federal Way, Washington 98003 Attn: Stacey Welsh, AICP Re: Proposed Scope of Services and Cost Estimate Third -Party Review Wetland Buffer Intrusion — Kitt's Corner Apartments 1201 South 336th Street Federal Way, Washington Dear Ms. Welsh: Landau Associates is pleased to provide this proposed scope of services and cost estimate to provide third -party review services to the City of Federal Way (City) for the above -referenced project. This proposal is in response to your request dated November 12, 2015 and is based on a brief review of the information provided with your request and our experience on similar projects. Background Information The City is requiring a construction report from the applicant developing the Kitt's Corner Apartments project as a result of wetland buffer impacts that have occurred during construction that were not a component of the approved wetland buffer mitigation plan. The impacts are associated with a 100 foot (ft) rock/quarry ravine constructed the full width of the wetland buffer. The applicant has provided the requested information, and the City is requesting support with peer review of the submitted documentation. Proposed Scope of Services Landau Associates will provide the following specific services: Review background materials provided via correspondence dated November 12, 2015 for consistency with the requirements of Federal Way Revised Code (FWRC) Chapter 19.175 "Regulated Wetlands" specifically: — Chapter 19.175.040.3, "Structures, improvements and land surface modification within regulated wetland buffers" • Conduct site visit as necessary Provide written responses to findings, recommendations, and requests for additional information from applicant, if needed • Meet with applicant's wetland biologist, if needed 130 2nd Avenue South • Edmonds, Washington 98020 • (425) 778-0907 • www.landauinc.com Third -Party Review, Kitt's Corner Apartments V Review of resubmitted/corrected documents, as needed e Project management, as necessary, if additional land use review is required. Assumptions Landau Associates We will provide a draft version of'the Third -Party Review memorandum for City review, and will provide a final version after addressing/incorporating any City comments, as appropriate. e Written responses and resubmitted/corrected documents wiii be provided in memorandum format. • If necessary, meeting with the applicant's wetland biologist will occur at the time of the site visit. Review of resubmitted/corrected documents is limited to one iteration of revisions, as necessary; to the original dnr_iamentation provided via mail dated November 12, 2015_ The City will coordinate necessary access permissions to onsite and City -owned offsite properties. The applicant will be responsible for coordinating access to non -City -owned offsite properties. Deliverables • Electronic (Adobe PDF) copies of the draft and final Third -Party Review memorandum. Cost Estimate We propose to provide the above -described services on a time -and -expenses basis in accordance with our existing professional services agreement with the City for Third -Party Wetland/ Stream Review and Evaluation (signed August 1, 2013). The estimated cost for the scope of services is $6,600. If project requirements change or unforeseen conditions are encountered that require services beyond the scope outlined above, we will bring these to your attention and seek approval for modification to the scope of services and budget, as appropriate. We will not exceed the total estimated cost for our services without prior authorization from the City. If the above -described scope of servirps and rnct ectimate are arrentnhle, please nrovirlP IIC with written•;;uthnri7ntinn, November 20, 2015 2 Third -Party Review, Kitt's Corner Apartments Landau Associates We appreciate the opportunity to work with the City of Federal Way on this project. Please contact us if you have any questions about our proposed scope of services and cost estimate for this project. LANDAU ASSOCIATES, INC. Steven J. Quarte man Associate Ecologist SJQ/kes 2016-2909 [X:\C_FEDERAL WAY\2015-11_KITTS CORNER\LAI_KITTS_ PROP.DOCX] November 20, 2015 INVOICE City of Federal Way CITY OF Invoice Date: November 23, 2015 t%a Federal Way Bill #: 201759 Ph: (253) 835-7000 Permit #: 15-105729-00 Project Name: KITTS CORNER MULTIFAMILY Applicant Name: DEVCO INC FEE DESCRIPTION Site Address: 1201 S 336TH ST CD - DEP ENV PASS-THRU(8045)........................................... 001-0000-000-239-10-004 AMOUNT $6,600.00 TOTAL DUE: $6,600.00 Stacey Welsh From: Kristi Schultz <kschultz@landauinc.com> Sent: Friday, November 20, 2015 2:44 PM To: Stacey Welsh Cc: Steve Quarterman Subject: Third Party Review Kitt's Corner Apartments Attachments: LAI_Kitts_ prop.pdf Hello Stacey, On behalf of Steve Quarterman, I am forwarding a PDF of our proposal for the third party review for the Kitt's Corner Apartments wetland buffer intrusion. Please let us know if you have any questions. Thanks! Kristi E. Schultz ♦ Project Coordinator Landau Associates, Inc. 130 2nd Avenue S, Edmonds, WA 98020 (425) 778-0907 ♦ fax (425) 778-6409 kschultz landauine.com ♦ vu Jandauinc.com Landau Associates is proudly carbon -neutral through our sustainable practices and financial support of U.S.-based carbon -reduction projects. NOTICE: This communication €nay con°a n prEu leged or other confidential information. If you have received it in error, = ease advise the sender by reply e€nail and immedirttely delete the message, and any attacrments wtho€at rousing ordisclosing. the contents Thank yo€z. LANDAU ASSOCIATES November 20, 2015 City of Federal Way Community and Economic Development 33325 8th Avenue South Federal Way, Washington 98003 Attn: Stacey Welsh, AICP Re: Proposed Scope of Services and Cost Estimate Third -Party Review Wetland Buffer Intrusion — Kitt's Corner Apartments 1201 South 336th Street Federal Way, Washington Dear Ms. Welsh: Landau Associates is pleased to provide this proposed scope of services and cost estimate to provide third -party review services to the City of Federal Way (City) for the above -referenced project. This proposal is in response to your request dated November 12, 2015 and is based on a brief review of the information provided with your request and our experience on similar projects. Background Information The City is requiring a construction report from the applicant developing the Kitt's Corner Apartments project as a result of wetland buffer impacts that have occurred during construction that were not a component of the approved wetland buffer mitigation plan. The impacts are associated with a 100 foot (ft) rock/quarry ravine constructed the full width of the wetland buffer. The applicant has provided the requested information, and the City is requesting support with peer review of the submitted documentation. Proposed Scope of Services Landau Associates will provide the following specific services: ■ Review background materials provided via correspondence dated November 12, 2015 for consistency with the requirements of Federal Way Revised Code (FWRC) Chapter 19.175 "Regulated Wetlands" specifically: — Chapter 19.175.040.3, "Structures, improvements and land surface modification within regulated wetland buffers" • Conduct site visit as necessary • Provide written responses to findings, recommendations, and requests for additional information from applicant, if needed • Meet with applicant's wetland biologist, if needed 130 2nd Avenue South • Edmonds, Washington 98020 • (425) 778-0907 • www.landauinc.com Third -Party Review, Kitt's Corner Apartments Landau Associates ■ Review of resubmitted/corrected documents, as needed • Project management, as necessary, if additional land use review is required. Assumptions • We will provide a draft version of the Third -Party Review memorandum for City review, and will provide a final version after addressing/incorporating any City comments, as appropriate. ■ Written responses and resubmitted/corrected documents will be provided in memorandum format. • If necessary, meeting with the applicant's wetland biologist will occur at the time of the site visit. • Review of resubmitted/corrected documents is limited to one iteration of revisions, as necessary, to the original documentation provided via mail dated November 12, 2015. • The City will coordinate necessary access permissions to onsite and City -owned offsite properties. The applicant will be responsible for coordinating access to non -City -owned offsite properties. Deliverables • Electronic (Adobe PDF) copies of the draft and final Third -Party Review memorandum. Cost Estimate We propose to provide the above -described services on a time -and -expenses basis in accordance with our existing professional services agreement with the City for Third -Party Wetland/ Stream Review and Evaluation (signed August 1, 2013). The estimated cost for the scope of services is $6,600. If project requirements change or unforeseen conditions are encountered that require services beyond the scope outlined above, we will bring these to your attention and seek approval for modification to the scope of services and budget, as appropriate. We will not exceed the total estimated cost for our services without prior authorization from the City. If the above -described scope of services and cost estimate are acceptable, please provide us with written authorization. November 20, 2015 Third -Party Review, Kitt's Corner Apartments Landau Associates We appreciate the opportunity to work with the City of Federal Way on this project. Please contact us if you have any questions about our proposed scope of services and cost estimate for this project. LANDAU ASSOCIATES, INC. r Steven J. Quarte man Associate Ecologist SJQ/kes 2016-2909 jK:\C_FEDERAL WAY\201s-11_KITTs CORNER\LAI_KITTS_ PROP.DOCK] November 20, 2015 MEMORANDUM Public Works Department DATE: 11/ 19/ 15 TO: Stacey Welsh FROM: Ann Dower SUBJECT: KITTS CORNER MULTIFAMILY - (15-105729-00-AD) 1201 S 336TH ST ; Public Works comments Public Works has reviewed the material submitted on Nov. 10. We were aware of the rock Swale installation and supported it as a way of containing runoff and reducing erosion onsite during construction. A rock outfall was proposed on the approved plans, however it did not prove to be effective enough for the amount of water that was discharging from the pipe. The developer felt, and staff agreed, that the proposed wetland plants to be placed directly downstream of the outfall would be washed out by the flow. Staff suggests planting near, and possibly even within, the rock swale to help camouflage the swale. Other solutions are available if the rock swale is not acceptable, however they should be evaluated carefully to determine effectiveness given the volume of water, and the amount of grading required that could result in further clearing and disruption of the natural system. Public Works is not opposed to the rock swale being left in place permanently. _ - 1 251" nAry Jim Ferrell, Mayor November 12, 2015 Mr. Steve Quarterman Landau Associates Inc. 130 2" d Avenue South Edmonds, WA 98020 Re: File #15-105729-00-AD; REQUEST FOR THIRD PARTY REVIEW Kitt's Corner Apartments Wetland Buffer Intrusion, 1201 S. 336`h St., Federal Way Dear Mr. Quarterman: Please find the enclosed task authorization form and supporting documents for third party review of the Kitt's Corner Apartments Wetland Buffer Intrusion. City staff is requesting review pursuant to the agreed terms of the on -cal I contract. Please review the scope of work on the task authorization form, enter the task cost on page two of the document, and return it to the city. Following the deposit of fiends by the applicant, staff will provide you with an authorization to proceed with the scope of work. Please contact me at 253-835-2634, or stacey.welshecitvoffederalway.cotii, if you have any questions regarding this task. Sincerely, Stacey Welsh,, AICP Senior Planner enc: Task Authorization Form Supporting Documentation Doe LD 71410 33325 8th Avenue South, Federal Way, WA 98003-6325 (253) 835-7000 www.cityoffederalway.com WETLAND CO�SULTANT AUTHORIZATION FORM r Bate: November 12, 2015 City: City of Federal Way Communiq, Development Department 33325 8'1' Avenue South Federal Way, WA 98003 Consultant: Steve Quarterman Landau Associates Inc. 130 2" Avenue South Edmonds, WA 98020 Project: Kitt's Corner Apartments -- Wctland Buffer Intrusion 1201 S. 336"' St., Federal Way Parcel n202104-9070 File No.: 15-105729-00-AD Project Proponent. Stephen Sullivan Devco Inc./ Heartland Construction 10900 NE 8°i Street Bellevue, WA 98004 425-233-6441 Project Planner: Senior Planner Stacey Welsh staccy.ivclsltiOci[voffctlerahva%,curse, 253-835-2634 Project Background: The applicant is developing the Kitt's Corner Apartments project and during construction there were wetland buffer construction impacts. Third party review of the submitted ;wetland information is requested. (Documents provided: m Memo, front City of Federal Way to CPH & Devco, dated March 10, 2015 • Letter wj I Ix]7 drawings of W 1.2 & W2.0, From Talasaea to City of Federal Way, dated July, 20, 2015 • Letter, from City of Federal Way to Talasaea, dated August 20, 2015 • Letter, from CPH to City of Federal Way, dated October 5, 2015 • Letter wi 1 I x1 1 drawings of W 1.0 - W3. I, from Talasaea to City of Federal Way, dated October 8, 2015 • Full size set drawings W1.0-W3.1 (8 pages), prepared by Talasaea, submitted November 10, 2015 • Wetland Buffer Mitigation Plan, prepared by Talasaea, dated March 4, 2014 * Copy of Chapter 19.175.040 Task Scope: 1. Review the background materials, submitted documentation and associated data for consistency .vith the requirements of Federal Way Revised Cade (FWRC) Chapter 19.175, "Regulated Wetlands," (NOT recently updated version per Ordinance No. 15-797—the previous version of the FWRC Critical Areas Code applies in this situation) especially: a. Chapter 19,175,040.3, "Structures, improvements and land surface modification within regulated wetland buffers" 2. Conduct site visit as necessary. 3, Provide written response to findings, recommendations, and request additional information from applicant if needed. 4. Possible meeting with applicant's wetland biologist. 5, Review of resubmitted/corrected documents as needed. G. Project management as necessary if additional land use review is required. Task Cost: Not to exceed � without a prior written amendment to this Task Authorization. Acceptance: r _ , Gnnsul Hirt [�:�1L � It - 2l-J ✓' City of Fede l Way Staff pa1e 1 Applicant Lute REQUEST Fc ADMINISTRATIVE DECISION Way i _ DEPARTMENT OF COMMUNITY DEVELOPMENT CITY of 33325 8`h Avenue South Federal V V r- ^ }_1:7�M ED Federal Way, WA 98003-6325 253-835-2607; Fax 253-835-2609 ►vww,ci�o1 ederalway.com % ; ,ctinl WAY Date November 10, 2015 FILE NUMBER 1 � _ - / _ D Applicant NAME PRIMARY PHONE Stephen Sullivan 425.233.6441 Direct BUSINESS/ORGANIZATION ALTERNATE PHONE Devco Inc. I Heartland Construction 206.755.8830 Cell MAMING ADDRESS E-MAIL 10900 NE 8th Street ssullivan@devcoapts.com CITY STATE ZIP FAX Bellevue WA 98004 425.453.9566 Property Address/Location Kitt's Corner Apartments -1201 South 336th Street Description of Request This request has two provisions. 1. Administratively Approve Revisions to an Approved Use Process III for Kitt's Corner. 2. Reauest a 3rd Partv Peer Review of the updated materials regarding the Wetland Buffer, List/Describe Attachments CoFW 1-page Memorandum dated March 10,2015; Talasaea Response 6-page Itr dated July 20, 2015 with 11 x17 drawings of W1.2 & W2.0; CoFW 2-page Itr dated August 20, 2015; CPH Consultants 7-page Itr dated October 5,2015; Talasaea Response 5-page response Itr dated October 8, 2015 with 11x17 dwgs of W1.0, W1.1, W1.2, W1.3, W2.0, W2.1, W3.0, W3.1 For Staff Use ❑ Code Interpret ation/Clarification - No Fee Critical Areas Letter/Analysis/Peer Review - No Fee (Actual Cost if Applicable) ❑ Request for Extension (Land Use/Plat Approval) - $62/hour X Revisions to Approved Permit - $62/hour ❑ Tree Removal - No Fee ❑ Work Hours Variance - $62/hour ❑ Zoning Compliance Letter - $100 Bulletin #079 — September 10, 2015 Page 1 of 1 k:\Handouts\Request for Administrative Decision CITY OF 11111;k Fed a ra i Way DATE: TO: FROM: CC: SUBJECT: Matt and Steve: March 10, 2015 MEMORANDUM Community Development Department Matt Hough, CPH, matt@cphconsultants.com ` y $�,nl ED Steve Sullivan, Devco, steve.sullivan@devcoapV*6 M Jim Harris Ann Dower Bill McCollum NOV ] 0 Z015 CI_TY OF WAN C175PA KITTS CORNER MULTIFAMILY (13-104418-00-UP) Wetland Buffer Impact Update Request 1201 South 336th Street I am hereby requesting to have Devco / Talasea provide the city with a brief written report on the status of the wetland buffer and wetland buffer construction impacts at the Kitts Corner Multifamily site. This construction report is warranted at this time based on the fact that the City approved minor wetland buffer intrusions as part of the land use review process, and based on the following: 1. I recently found out there has been a 100-foot-long rock / quarry ravine constructed the full width of the 100-foot wetland buffer, and this is not a component of the approved wetland buffer mitigation plan, and it's a hardened improvement in the wetland buffer. 2. In the past couple weeks I noticed a large fir tree in the wetland buffer visible from South 336"' Street has been significantly de -limbed and almost void of branches and canopy. I had some email discussion with Lakehaven Utility District a few months back about the process to abandon an existing sewer main on the site in the wetland and wetland buffer. I had outlined the City review process and had asked for some information on how the abandonment would be done, as it would require access into the wetland either by heavy equipment or by hand. These intrusions for sewer abandonment were not a component of the approved wetland mitigation plan. Please provide a status of the sewer abandonment. The report must: • Provide an update on any intrusions into the wetlands and/or wetland buffers that were not part of the approved Wetland Buffer Mitigation Plan dated March 4, 2014. ■ Identify status of wetlands and buffers for compliance with approved plans. • Identify any changes that have occurred from the approved Wetland Buffer Mitigation Plan. • Any other items Talasea identifies in the field. Let me know if you have any questions. Doc I.D. 68220 TALASALA CONSULTANTS, INC. 20 July 2015 Mr. Jim Harris Contract Planner Community Development Department City of Federal Way P.O. Box 9718 Federal Way, Washington 98063 RESUBM11 1 ED NOV 10 2015 CITY OF FEDERAL WAY CDs TAL-1422 REFERENCE: Kitts Corner Apartments (No. 13-104418-00-up & No. 23-104419-se) SUBJECT: Response to Wetland Buffer Impact Update Request Dear Mr. Harris: Our Buffer Mitigation Plan (10 July 2014) for the Kitts Corner Apartments project identified the existence of a 24-inch stormwater discharge pipe at the north edge of the buffer for Wetland 1. No alterations to this discharge pipe were planned or required for the proposed buffer mitigation plan. Construction of the Kitts Corner Apartments began in the summer of 2014 and included clearing, grubbing, and grading of the buffer at the north end of Wetland 1. All work within the buffer was in preparation for construction of a soft -surface pedestrian trail and proposed buffer enhancement work (removal of non-native species, replanting with native trees and shrubs, and installation of habitat features) (See Sheets W1.2 and W2.0 attached). When the rainy season began in October, it was discovered that the stormwater discharge pipe releases a considerable volume of water. The discharge caused significant amounts of erosion and rilling within the graded buffer area (Photo1). Mobilized soil flowed in the general direction of Wetland 1 creating the potential of unintentional wetland fill. The contractor imported round river rock and created a rock - lined spillway through the buffer to control erosion and protect the wetland from sediment -laden stormwater discharge (Photo 2). The work successfully prevented further erosion, mobilization of sediments, and continued deposition of sediments into Wetland 1. Resource `& Environmental Planning 15020 Bear Creek Road Northeast - Woodinville, Washington 98077 - Bus: (425) 861-7550 -.Fax: (425) 861-7549 -------- ----- Ift X-I Jt, 40, Mr. Jim Harris 20 July 2015 Page 3 of 6 This work, however, fell outside of the approved buffer mitigation plan and was not permitted by the City of Federal. On 10 March 2015, the City of Federal Way, therefore, has requested that the buffer mitigation report be updated to show how the rock -lined spillway meets the requirements listed under Process III of the City of Federal Way Municipal Code. Additionally, the notice letter provided four bullet points that also must be addressed. These bullet points are: • Provide an update on any intrusions into the wetlands or/or wetland buffers that were not part of the approved Wetland Buffer Mitigation Plan dated March 4, 2014. • Identify status of wetlands and buffers for compliance with approved plans. Identify any changes that have occurred from the approved Wetland Buffer Mitigation Plan. • Any other items Talasaea identifies in the field. As was mentioned above, the discharge from the 24-inch stormwater pipe created erosional conditions within the buffer for Wetland 1 as the buffer was being enhanced per the approved buffer mitigation plan. To address the erosion problem, the contractor imported round river rock to line the flow path from the stormwater discharge pipe to Wetland 1, thereby preventing degradation of the wetland through excessive sediment deposition. This constitutes the limits of additional intrusion into the buffer for Wetland 1 that was not part of the approved Wetland Buffer Mitigation Plan. Wetland 1 has not been altered by the additional intrusion. Any changes to the status of Wetland 1 resulted in the potential deposition of sediments resulting from erosion caused by the discharge of stormwater from the 24-inch stormwater pipe. The originally -approved Wetland Buffer Mitigation Plan satisfies the criteria of Process III in that the buffer mitigation would not adversely affect the existing quality of the wetland, its buffer, and associated wildlife habitat. Clearly, the unforeseen erosion resulting from the stormwater discharge has the potential to adversely affect the quality of the wetland, its buffer, and wildlife habitat. There are five components that must be satisfied under Process III. These are listed below in bold type. Our responses follow each component in italic type. a) It will not adversely affect water quality: The conditions prior to the installation of the rock -lined spillway had a high potential to affect water quality. Soil mobilization caused by discharge from the 24-inch pipe would likely have a deleterious effect on water quality within the wetland. The rock -lined spillway prevents mobilization of sediments and the resulting reduction in water quality. Mr. Jim Harris 20 July 2015 Page 4 of 6 b) It will not adversely affect the existing quality of the wetland's or buffer's wildlife habitat. As with our response to Item a above, the mobilization of sediments resulting from the discharge of stormwater from the 24-inch pipe would likely adversely affect the existing quality of Wetland 1 by deposition of sediment. The likely result of such soil deposition is the loss of wetland vegetation and, consequently, a reduction of the ability of the wetland to provide wildlife habitat. The rock -lined spillway prevents the mobilization of sediments and their subsequent deposition in Wetland 1, thereby preserving existing wildlife habitat. c) It will not adversely affect drainage or stormwater retention capabilities. The existing 24-inch stormwater discharge pipe historically discharged water into a vegetated buffer area prior to sheet flowing into Wetland 1. There will be no alteration to the rate of flow or its duration as a result of the construction of the rock -lined spillway. Therefore the existing capacity of the wetland and buffer to retain stormwater will not be altered. d) It will not lead to unstable earth conditions nor create erosion hazards. The buffer conditions around the 24-inch stormwater discharge pipe prior to construction of the spillway created an erosion hazard as seen in Photo 1 taken prior to the construction of the rock -lined spillway. The spillway rectifies the erosion hazard by stabilizing the soil down -gradient of the discharge pipe while still allowing for sheet flow of stormwater to Wetland 1 (Photo 2). e) 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. The rock -lined spillway will not alter the hydrology of Wetland 1 compared to pre - construction conditions. Therefore, it is unlikely that the spillway will be materially detrimental to any other property in the area, nor to the City as a whole. The spillway will not result in the loss of open space. The rock -lined spillway may be allowed within the buffer for Wetland 1 per City of Federal Way Code §19.175(3) Essential public facilities, public utilities, and other public improvements, which states: "The director of community development may permit the placement of an essential public facility, public utility, or other public improvements in a regulated wetland buffer if he or she determines that the line or improvement must traverse the buffer because no feasible or alternative location exists based on an analysis Mr. Jim Harris 20 July 2015 Page 5 of 6 of technology and system efficiency. The specific location and extent of the intrusion into the buffer must constitute the minimum necessary encroachment to meet the requirements of the public facility or utility." The 24-inch stormwater discharge pipe is a public utility and represents an existing condition. The buffer mitigation plan inadvertently created a condition that had a very real potential to cause damage to the buffer and to Wetland 1. The most expedient way to rectify the situation was to import round river rock and line the expanding rill to prevent further erosion and potential damage to Wetland 1. An analysis of the contributing basin is being performed by CPH, who will determine the maximum expected flow from the pipe and will allow us to modify the spillway to a minimum width that still provides adequate protection to Wetland 1. Preliminary estimates suggest that the expected maximum outflow from the 24-inch pipe is between 15 and 20 cfs, which equates to approximately 6.4 feet per second. In addition, the rock -lined spillway will be enhanced with habitat features (such as logs and rootwads) and native shrub and tree plantings to achieve a more natural look and to restore the habitat potential of this portion of the buffer (Photo 3). A revised buffer restoration and enhancement plan encompassing the rock -lined spillway will be prepared and delivered to the City for review and approval. Photo 3. Large Woody Debris in Spillway. 29 April 2015. In summary, the stormwater flow from the 24-inch stormwater discharge pipe was causing significant erosion in the buffer for Wetland 1. The contractor responded to the erosion by importing round river rock and placing it into the rill that was being created by Mr. Jim Harris 20 July 2015 Page 6 of 6 stormwater discharge. This work was outside of the approved buffer mitigation plan. The City has responded that the existing report be modified to show that the placement of the rock within the buffer is compliant with the five criteria under Process III. We have demonstrated that, not only is the additional buffer work compliant with the five criteria under Process III, it brings the entire buffer mitigation work back into compliance. We trust that the information presented here will be sufficient in amending the Wetland Buffer Mitigation Plan for the Kitts Corner Apartments project. If you have any questions or require additional information, please contact Ann Olsen or me at (425) 861-7550. Sincerely, TALASAEA CONSULTANTS, INC. David R. Teesdale, PWS Senior Wetland Ecologist Attachments: Sheet W1.2 Sheet W2.0 cc: Jack Hunden AS17241217 - arch CS17241217 - eng NETLANDS TOPO EX. COND17IONS CBLA241217 CUSD2412n CUWS241217 CGRD241217 GLEARIN6, SMW I NS 4 HAS I TAT FEATURE PLAN PLAN LESENp �+ - FRO.IEGT SITE BOUNDARY 6RAPSCALE ( IN FEET) l� IN FEET _ EXISTING WETLAND WETLAND BVFFER/5EGURITY FENCE O 15 30 :a SCALE, I"=30' EXISTING STREAM CENTERLINE EXISTING FORE5T/SGRUB-SHRUB VEGETATION NOTES FOR GLEARIN6, 6RUBBINcS 4 HABITAT FEATURE INSTALLATION _ _ PART 1• BF3ERAL lasacr lNB A ppY.Elpaa I. CCntrica -µell 91ve Talmoeo Consultants o ml~ of ten QO) dole not" prior to beSWN eo eS`l than. 2.rw ease, "m wank 1xwll %aanarka 1YIW theta Is a ,eating botween the.lwrx, TOlpspsa Laneultar". 9e 1, ciwah¢ mdA o� eaiArork cirkravla , and the la alwx a cnntr Ur. the opprared P$a pec lH.ptlprr "I be eevkwod to !rasa 00t Oil pa'SIM nwlvea VKbroWd the Vlant ud the •P•e c deWns retatod W the cdrh&#cwlwn eipcAmsate, .paoIIWd]pte a'1d aftl .ar+atralr!►. S.Locolk+ns of eAsthY+qq uUMW hoed bean Mtabllishod b9 hold sArvag v cadned from acdlf{140 record& and. ehtica to .onsks red dpp'O.W4 to wry O1hd net ro. M.OH4 ca ptela. It in k,s sok relrpdw7 III of the %anlrxlc•Ln' W. W halpsndeat4 veil$ lino aeevoey or 94RRy k.altpl and W dreovar and am'A ON Hinshaw NWin Ihe fflUganan plan mads7 Orot are not knr•n sot tram into km dWt" by rrpkmentoelan of Ud plan, 5uri, ors.iel w W be .IsO'h; mw'ked h the Field. Tolos ldo GmvAlWmt slraQ trovlew a^I wNlck A+IIh !Hw aPA'a~'ed roCi9otxxl pAan pro, la rtrrt a cantnAcnon 4,A�rypl a4adPla'd ma! bean .Ina r4A.nerer po1rVY.tiea Is In prayv.r. Aad Mali ,!anon on 5, dvn*% moon 1rraL be Pdmomr w in owc"imre wilt, Olt !gene$ .io'hde'd0, rT,iee..ades, pa,.vt oMKIIII rs, adlor at.$r applk.6le lw* w and palkles- 6.Te proJeGt o..ra kyarrI. M raepwnslbk for abtohhg dry ol.W rotated are regW" psrnek prior to the 7lia� of .arleknwtbr,. T. A gmllHed ecologbt shall be an site, m necessary, to rdnitar mltl9otlon carstrrwtlon and dpprwe minor revisions to the plan. D.10% he erdracla- W 1*6 matnPwm aw coeel'WIA , mthUwt prcrnd taxwDacetavndtaopolAAanl& from antar't19 mki9pkln AXeos or other hoaral r. Ili a We slab- -1. Preventotrve meawres *roll be used to protect exl.hkhg etOM &0v* a systems, 0x1&ttg -hulls&. oa roads. 'I Ganere.tar wfhell provhde sedhienk and a Ivn controls aroXd the protect area prior W soll mubmt Ka Ihwrl COYVuCtlOrt atIv t9. B. Ciayic.WL100A I%* roflpeng provides Me ga" of !!queue of "WIL06 04101PO ad to to neae&salj to coff"Ild the mINg� project. Same Ot aheM acAmkwo lraj be "m%4 ted w,.y oMkl m Galop S a.p between IM CerKra.tor. Takeaea Gonsuh vs,. bra the Orrar6 uepraaen'atN.a to rave the praJec! pro"' 2.9rrvay in fanYJ In11S1. 9.Waca11 eel crops Rd ay Ctrer arglan o',d ssdnnMtatlan control 54Fi necessary fa work In the mleor art oreoe. 4.Glepr end g+b I+rr+++otNahn'a.hti veg.lcs son from build 5.lmtoll" Amend eWh and piece krgo w•°�aj material. T, Gonecrwa ped"Wim sofLHa'foce trait ..1wh wrf _ bx[ tr,At avericak a hMdl benares owl IrNerpreltw .Igoe. 1.0 rj,,I to Will, 44e0F.p ad hmdll plant mots lol m indlu"d an the DAW Mt"lm Planting Plan IO.kn&tdll spnt-colt se,-s and r/Ttkar eraa wqa- 1.2 PRO.1l LOHDITIONS A LontrP.tOr shah l AMee'e "I C"r, Kilen milted odtmkiee 0. rot dana." atr4" reou'" yr !%Jp r,L %mgehotLa n. raksosa Gore ,1110" nhatl be ,0111360 b.ro6larim j If o Ida11ldl dpo[feeoge , Lerifln ere shall m>•,Xe that odJWAWt roads ar"e WAV A01mad as "L 4W/ ald or &a for other de arm a! an Lbn.Lw Lbws ditrg Woolln. Car4rml r &hall eaeply Wtl the gr.nrnkkj IA lsdUIms Codes rdgmdhg.lr.et n.araenanL 41oal irg dr.g mrsltmwAloft B, r' t r,.rn�9+s or moMcotlor+e !o the miergdtan liar,! o" epeculwtt.r+e must race p•wr [ppra++p ,ram w drew,& r`epra.erriolM, Tdk.aen earwAlloVR aw A7ppllC,o)te armies. 15 HARRAH" A. t*YO -', Terror ad landle]cve. A eoAfaClaM1prwkbd rlanranly Mw11 eklona W o llabd of ans ystr rl o the tUe of Pp.h1ypeYdl conpletksL pho" ccmaropIs"- Far the nook of this Mown L the dd. whoh all W*erryngWbfg.145ked reaAra pla:oelw4- pIw4YAg tenporoy rr[9 ., old ralpNd paws a " work has I, carp!nteer ad bra oaeepiod bli fits a41$r4 mpresersar Non, ToWs000 Lerwh lts. old opplwx+le agencies. PART 2, PRODUCTS AND MATERIALS 2.1 HABITAT FEATURES Ab+alkw gMlsh4 Boxy f. •a.r;Fltow rtewlr,g lama a+d eholt be c4'aL-Awlsd of csdan an rAproM. 2. CGnIrMW deaf low0 ae 0410. n6sirl9 boots,$ at, axa:tmdaa Ca monk, (4251 Ebl-7550 or, b.Seattle Audubon Soclebf, (206) 523-44M or, ..Palo BIrds Unihibad, (206) 5TJ-4001 B. y7�x�rJ1ev� WII bs coda^ or rr !pecks, 24-5'J feet Ipng, w�rJ1 a mnM.m d eight main brooches, and o mG dar]w�r of 20 oche! ak good level aftw eaWl�atWr G. DLga mntr&,m peo'naor re fWs. he a 20 root minbm leh, with a without WeID Iebe kept Intact. Ends that have been vA shall be dislramod or+d not blurt, D. Sw p. w dt Ip aa)w pon.sx pp, roacdee &turps, a cst rrva-oo`_dn ,.It a mranm at tire! feat W trvrti 20 l keen YI dlamler mn,/M1rr,. EeWtl !A% W ] asap wk shoo ty duvoozed ord not E. Boulders, I. Use boulders ulcwerod from on -site grading operations, IF Wallable. 2. One v Wo-po s mntam size with twelve In.hes mnkram dioneter. 2.2 SOFT-SMALE PATH A. Toll slsfactg shall be clean w.0dah". See dal on mltkptkn plans. 29 TOP'AIL A. Topsou owl has Veen Ikd a Ito for foie,!! VI pmpet o^ed(w) or hy-L d Frain Of-eft. be rattle, Maple, *0,4 lade rAaca wp, kea of uifsoll, cky wrrps. kA. weed.. rook, fWrlps, sFwa la-ga than I Hkh n o'.f dhwnswi, NW. a py ether elrh'arear or tuns. m !;L hpmNl tap 9'aw�. B. ems, Irrported topsoil shall corakk OF orgonlc mterlal. amended as rw%essay W prodk p bulk armdc wntsnt of at bast 10 percenk and not .Teat!, than 20 percenl, m deko'mMed by M9NY0-■-IQ4- 2.4 MILLHH A. Bat a h 0*0 p mulch shall be derived from Douglas ern pine m hemlock specks. The mulch WII not eantah nose, t"In are other car =Kb In quck48o, te* would be deVi rental to anknal, plat lite or wow goamy. B. I4flch shall be gourd so that a mnrrrm of q5% of the materal will pros through a 15-hch Its" old not more that 55%,19 Wass, whine, will pass through a U5 No, 4 We-, PART 5, EXECUTION 1. Prier to cry c ins tlm% a licensed w•rApr sha11xr +ems atolls. and flog alovylg lv5". Craving Itnik are aepktsa On the Irvu"Wn plow Tdtaeaeo Coow l xAL shot realm+ e'd oppra'w h oo,^ , c Yg IrnUs p•wr W ON verptatlirl ra.wA,al. it k the rerpppPq 114 of the t*WMtar to von the atVol 6xC.be of �ylgatatsPn W be &Wed W regWs: eMT Ya,awlaa LaraAM1Vxa+ mo�ry the m-�,pvpn Pion as, rwres.ay W aMk au .IgTIr""t nat" wrtptmn. 2.C-mWmta µroll wftq the center reo of proposed troll. Tolosaso Lonsultonk will Cron mview and rccaty stun aHgTrwn! w rece..e.ay W o nrd 21V b s of existing s1ylI trees. No trees Mall bo ramarcd per Bran wow.Awn. B, P-',Y, [r,A FYala[L EywRNe V lobo to Sc,;V, 1. CararMW "ll to eaepansbk For 9vWNsJ a1.Ewto h to exlwktrg Ve9ebmtkm IorAled auklds the .oaHn9 lhvu. No rwfCvral or ON .vrtolkr, shell an r+,r HHIOWA Wlor opl -cal by TolmMa C.o.lwllp.Ls. 2.Talmoea Oa Ina is &Toll Il" eri{Ihg v Lcbcfn to torso w.oted faun to rnngotbl cfda*. Flagged vegetation shall rat be dAwa. uoeWas, approved In.rRrg b) TCko esa morito. B. eerlvo.kar M+elI exerclso cite to p"e * in^ to the In.r1k. reels, ona Wer.2 s or treads ord sh„ba to rqm ML Ary woodli pknA1 to N-Cn Shot % dMV96d Ali tructrpr .halt be. treated &n,rsdkse dta oocu'w and Tolp&aea LaMll/ltad. &Ihptk ion ro J d of VA10mi. Donor traatewl. Mal h.kde e��Mh9 bW'An exarKh.r. kf'nkr, ravtl. bhp dana9M Area t1a'k. In]�rW par" MwnI be tlarony,l5 and owlawrrar rsasAree 009 ba iaw�rl, m apP`ap„kla, W dd h piper MMw1 L, Pleee !ye.bn f trot Me[dYe., I, coraom r µw,l it" silt rsnl tm Photo sI%- do the makrgpuan pia to my mf[lgalwn Corslt l"T1 "tNna44� GaltraNar "[I mamdh Wawa control fad 1aW WAIT (prlipl.l twn of a.tratr ilWe Tmwso$o conljoas than vgerly o d oppb locations OF 4r bin o "r n sO v, prior to .lm Ing -11goklan czng c,GLha1. 2,GmMM W shall monta.l W"k.n -AmZ fnea$Wde W "WWW bark %%Dlt too coaranoWd with a kit Carlbdl Iv cmi .Ns, work m rle,ee&say. Ts.aa rl,ee&Aree II ralroh In pkw Arlin WMMeeMlla. b given ty Yalelsawv 4arrugatlt nor rrmo.ah ere 1."lm C=vlenl_ LL 10 line rmpllrbll or t1s Ci.4rO%tal. la rarlha+e es'I worllan [antral n+sa&Area oa]eCar! to ssrr&Ii" preor i•hM WlfharI, raj Talasoaa Cprsvltalts. 5. Ali cdnseveetan a od seasonal wrldltkns "k4a. ehroswn %antral FeXIlnks Noll be eraY4ashwd and/or a e.W as, roq+lraa b;l Talasoea Gp tLpnt► to Melt d MnAbd ao.lanrwahrorAaLWr co,lrOl. 4. where possble, natural good cover vegetation WII be maintained for sroslon control. D. 1. Centrally aho11 gnat lvt ,.nh 1ro%fawy all 1hp.-rnttw and mwtw wgetatlon within bulfa mNlgotwn Area B m shown an the mlt9atlan piers (Sheet WIA with the exception or (lagged existing vegstatkn to roman. 2.Cdn&*"w s11W1"pet pA haw oil n:v YnANe and hvmkv w9mmi.n wimn PAFar mrtgotw Area C as sl- an the mklg011oP pkns ([-relit W.Q. amtemW Owl rennin in Cmlye epecks ireludh9. Pat pro ndt IhRap La, 546t6 OVORR BVM by HhAOlayaA and OWI y an blV� pwpie bwaetrfle, hedge 1 -4:64 lid t' tag g1a4i,* Jne•• llrvi.wad Gondola l %sv. peed cwtvygnes ad crnapky rigmA rode. All roc 11 be rarlawd to the n%bdlam ex[M. proUkabAs, 5. Contractor stall clear and gab sall all9rrront corrldor 4.Ali g�x'ee vagelASwn Well Cs !,parted tram the site and 01thI or 1n an opp Wad old r tallaeTg dt apptcabie 1pCo1r5lalpAFpaprpF req lotkre. 5. Tatoee.m GpWlkprtn &hull oa&"* aq o37l Wal plant ep"6" to be rdmDved Arty mitigation .uew[tkn. E. mseerr. I, Irrkoli srxAg $Pen cempkkkm OF ciclWV4Aa4klkra at Ioaotlara aaplcted an murk an pka,t& (&os Detail 6]. '"s o9t tMW[ be arWaraa Into rugaaa a min* /. vl r pereaM of pro tatol 1pr,gel� as, 66WI n the plot dolor. Tplps,aea [pWltant& &Y1a1[ vpp'o+'e snr[r9 tp.oti0rl. prier to M.cd F- Y^neelf I, In OII 4wvsa one g1FAa,ea tHffor mnl kit av e. *WWN $all shall be alwded fa- topoon Insevis Il to prarda a q-hch nAtd,rn depth or fppsoll. B. lKjr ,5 lyl Tex �QR�pe, Plo o bolal. (enh/aa Apra v►Tt. mlm as 1096010 orwld- DWI p atdnent plaap,w,I. de =71 the h 30'alr plan *16 delo,4.7019mceo Careul#r t* shall vil teppteprq prier W 1. Selre.,� ,tjQ;l Sov�, Al One Ms1�j ban to!rain Melallea W"P mnenlm at 15 feet Off the grprp on the svuvrooat wap 00 the eneg, of oddjkat, tun QO) oddNlanel s.AOHaw I e,k Canoe shah be notaltea an *.Kv f trees w1W, tvlfa a,iwwement -00. epprexwoAakJ IS' all the g'o4M an Qs, 5C eye of bees- Grant k.0kxr to b6 dcll arm fed &1 the field tJ 7aia&osa CatwNalKs. 2.eht•a, To "k4wook down bgs, Hot ewe the kg 0 the 4.0"a kng7, W mo.bksr+"I ekox. lfren I✓,•p the kg at the scored tocoticn to voche a rourv, took to the trade. *t 0r*km oar to a" last coo. Iwbltal feehror WaL hhaA,n been.A when Ipva na bhert a1df. S.'5%maL 5lrmps shall ba set A xVft. 4.02ldlh. If avatkCk, I;Wdars WII ba poc h piles at Wool 2 ra.k& peep M rapk inn. per pa&AH, In nrcrrror that p,wwsr both phploc =mq mj o-9• heor of +roko- H, ]QmdOap4 GOrebwt Overlook Vkwpoht at location depleted an Street HI.2, Per detail 4 an °Jwel V'tlA I. Install Troll, I. Corebwt soft -slit c troll Inwetiod buffer where &howl an plans per Detail B. 2. Install Benches per manuloahs. 's spscllkalkxe. 5. Install Interpretive" per Detail 2, 5hwt HOD. J. Tc% a Gar40MA W4 be prwlded a mukh saTphe P-IPr to It be" dnhvseed to Yin Ina. No WRor area* uen Los seo~. L Ca4rmla rMkl sproM ralkh ova an m.WrWa son CA Fee cram that ltwe been t%wod/grlbped to ocly ve 0 vulcnn depth of 5 nehee- K, Mall?-Hao`a r,ww I GHL"nl a�ee .Ape. 1^• ln&tait fro as, wpn an -,heat MI, per detail I, &host NSA, 2. $retail cefkYal area ey+& a whoa on 5hrot NIA, per detail 5, sheet NOD. L. I0tj.1sitigal. PrW to pLW4 h&lO1lp,rpn, Tala&aaa CCnwltante "ll opq' oil c work ad hh-*Wi Foatpe placenrn6. If ii-is as, W be caYeAeled, a P'ueh cull It a Ye Tdlmlea Gurftm k .hall P&Amm tfk proJ�itc t For 1 atIntoretawpiawi �d pwrrh 1nlrWr�i�ad i"o'k kq n,a) than proceed. M• • ,Sk�HLVyd.1cM, It Utara n d 40" n vcln ctien For ay mason, i:oru xtvr shell be re&poneble ra mpheewK-0 of ereswn C-vvl aao.yrw, Vdhv., and tenlpOray Irrigation QTng caetructbn delay Period, Ha..e *Lh&r..1.e !Wiwi h wresg. GLEARINcS 4 6RU55INcS 4 HAS I TAT FEATURE LESENC� F STUMP ® DOM LO5 SNAG WITH SWALLOW e NEST BOX, SEE DETAIL ws NOTE, IN ADDITION TO A SWALLOW NEST BOX INSTALLED ON PROP05ED SNAG, TEN (I0) SWALLOW NEST BOXES SHALL BE INSTALLED ON EXI5TIN5 TREES WITHIN BUFFER ENHANCEMENT AREAS. EXACT TREES AND NEST BOX LOCATIONS TO BE DETERMINED IN THE FIELD BY TALA5AEA CONSULTANTS. -x x - SILT FENCE, SEE DETAIL e GRUB ENTIRE AREA BY 18,23q SF HAND OR MACHINE TO REMOVE ALL INVASIVE SPECIES AND REMOVE ANY TRASH AND DEBRIS SELECTIVELY GRUB OUT 4b55 5F ALL NON-NATIVE INVASIVE SPECIES BY HAND. PROTECT EXISTING NATIVE VEGETATION TO REMAIN. .tOHAS Rf FILTER FA15kiG SHALL Be 6FLICIS7 AT PoSM USE 5TAPIL25, HIRE RIl15SA OR 5WrVALERr TO ATTAdW FABIRHC TO POSTS. 2W BY 14 BA, WIRE OR EGUIVMENT. FILTER F AL ] 5y+-r+�$• rlbx MRhNthf 4k4' TPHYw POST EPAGNB MAY �1 - 9B Ire CRIEASW TO TR@A'.H PaTH P#Ikvyt Sim 5' 15 HIRE BACKING STD FENlr POr NOTE, FILTER FABRIG FBES @AR OR EpAVALFh,T W. SHALL Be INSTALLED ALONG OONTO(R KIE11MVER POSSIBLE. ELEVATION CR055 SECTION SILT FENCE IMINTERAME STANDARDS, I. ANY DAMAGE SHALL BE REPAIRED IM MMIATELY, 2. IF CONCIRORATED FLOHS ARE EVIDENT UPSLOPE OF THE FENCE, THEY MUST Be INTERCEPTED AND LOWIRYED TO A SEDIMENT POND. 5. CONTRACTOR SHALL LHBCK THE UP51LOPE SIDE OF THE FENCE FOR SIBN5 OF LLOBBINIB AND 511155Ea:RNT CHANfELIZATION OF FLOHS PARALLEL TO THE FEW.E. IF THIS OCCURS, REPLACE THE FENCE AND/OR REMOVE THE TRAPPED SEDIII 4. SEDIMENT SHALL BE REMOVED HEN ArOCWMIILATION EXCEEDS 6" IN DEPTH. i �1LT F NOTES I. SURVEY PROVIDED BY ESM C.ONULTING ENGINEEER%55g15 IST WAY SGWTN l.TOO. FEDERAL WAY, WA c[WO5, (425) 415-51A4, 2. 517E PLAN PROVIDED BY C.PH C WALTANTS, W TTH AVENUE. SUITE IOC, K;PXLAW, WA PAM, (425) 2175-23y0. 9, WAGE DRJSyINGS WERE MODIFIED BY YALA5AP.A COW4A7.TAW-9 FOR VISUAL ENHANCEMENT. 4. THIS PLAN 15 AN ATTACHMENT TO THE FINAL p.ETLAND BUFFER IMPACT AND MITIGATION REPORT PREPARED BY TALASAEA OONEULTANT5 IN JJLY 2014, ` UOM YOU 0 CITYOFFEDERAL WAY APPROVED FOR CONSTRUCTION BY; DATE,' - pry OF FC m ely,, Wwrin rr OF Ii,VA'MM R/W PBRMTNQ, 001. - T.W.I. CnnxulA+n.+, Ina, All H*h1+ Hex+r.n0. G TAI LEA CONSULTANTS, INC. Rr.ourc. d Rovlranmon Wl PlannlnH W cr O IR Z 7a L C7 Z Lu CIO Z ,4 R DEVCO, HINC. wwv r.�.F 11100 Mein Street Suite 3. BELLEVUE, WA 98004 PHONE; (425)453-9551 g CP H CONSULTANTS Sb pmNly, EMI Enom drd undusim ul-Hyblvvlli w 1f ] M A,,,x,.. Mu W 01 &.er4 MA Ywfr n,w.;Ht10m10W I nRHintOJla r.r,rwr.www.n.rne maECTNQ. a TAL 1422 �1 )AAWINQ W1.2 I SHEET--LQF B r A97241217 - arch C517241217 - eng NE7LANDS TOPO EX COND171ONS COLA241217 CUS0241217 CUWS241217 CGRD241217 ■■ � .. - �� �+�" ■ i:ram= _ - s — ■ ilia':.1iii'i'•::Ir:'j�Y�r����0417� �•".�.. •r, 1�pY Yr�, �C •Qr ❑ nn�? Ober., ii tr i^i� �QQ� �� uµ V®Cij •all D � ; �" ►�� � ��`� ... '� ��� o Ins ®� u!7, C• ^ 0 QL1• 'e.?�����-Q 114�*� ���11 Ii0 �'��,�'4" ���rP�t��`'��' VO Q a � � :'�i��lf�r►-. 1.O 11� Q 11�e' Ili} ♦ �� o, 1 d � Q•. fie rJ CLEARING A 6RADIN6 LIMIT FOR CIVIL SITE WORK 'IrMi 1 1A1�. �1. IEEE iiii IRRI' rRl, � � 0 \ SOFT SURFACE TRAIL n WETLANDI \ 1 L J 15,520 5F ON a[TE CATEGORY II QQ PL?ANTIN6 AREA rA PLAN LEGEND � ❑ GRAPHIC,� rz NORTH PROJECT SITE BOUNDARY ( IN FEETEXI5TIN6 WETIAND 0 — — — — — WETLAND BIFFEWSECURITY PENCE' O i 20 40 • • - • • — FX15TINO STREAM GENTERLINE • \ SCALE: I"=20' rr'� ••� EXISTING FORE5T/5GRU5-5HRUB L r VEGETATION `I' •\ L W PLANT LIST , \ LARGE TREE5 MASSING SHRUBS i KEY SGIENTIFG NAME G0N9.10N NA1•E KEY SCIENTIFIC NAME COMMON NAME O CARN15 ALBA DOGWOOD MAGROPHYLLUM BI6-LEAF MAPLE Q MAHONIA AGUIFOLIUM T� 60N D PE BETILA PAPYRIFERA PAPER BIRCH Op. ROSA 6YMNOGARPA BALDHIP R05E II CORN)5 NU17ALLII PACIFIC DOGWOOD I - + ' P5EUDOTSUCA MENZIE511 DOU6®LA5 FIR R05A wrKANA NOOTKA ROSE j jam+ P5EUDOTSU&A MERZIE-511 DOU5LA5 FIR PARVIFLORUS TiIMB3_E5ERRY { ❑ } FRANISULA PUR5HIANA GASGARA ® RUBM 5PECTABILI5 5ALMONBERRY I Q THUJA PLIGATA WESTERN RED CEDAR SYMPHORIGARPU5 ALBUS COMMON 5NOWBERRY � 1 ■ THU.IA PLIGATA WESTERN RED CEDAR - TSUGA HETEROPHYLLA WESTERN HEMLOCK GROUNDOOVER5* KEY SCIENTIFIC NAME COMMON NAME co T51.16A HETEROPHYLLA WESTERN HEMLOCK sr en 6AULTHERIA SHALLON SALAL \ G SMALL T'REE5/LARGE 5HRUB5 s„eoL POLYSTIGHUM MUNITIM SWORD FERN \ KEY SCIENTIFIC NAME COMMON NA1-1E •6ROUNDGOVC-R SYMBOLS ARE NOT SHOWN ON PLANS. AGER GIRGINATUM VINE MAPLE 6ROUNDGOVER 5PECIE5 SHALL BLOCATED E LOCATIN BETWEEN \ {• TREE AND SHRUB 6ROUPIN65 WITHIN BUFFER MITIGATION `�, 100' BUFFER — AREAS A 4 B. IN AREAS LESS THAN 3' WIDE AT THE TOE OF I! OA. AMELANGHIER ALNIFOLIA SERVIGEBERRY ANY RETAINING WALLS AT BUFFER PERIMETERS (E.6. BUFFER ORESTORATION AREAS DISTURBED BY SITE 6ZADIN6 OR p CRATAE6U5 DOU6LA511 BLACK HAWTHORN WALL CONSTRUCTION, SEE BUFFER INTZU51ON AREAS m m � SHET DEPICTED ON EWI.U, 6ROUNDCOVER5 SHALL BE FIELD MATCH LINE TO PLANTING AREA B G HOLODISC 6 DISCOLOR OCEAN SPRAY LOCATED BY TALASAEA CONSULTANTS. OEMLERIA CERA5IFORMI5 INDIAN PLUM O RHODODENDRON PACIFIC MACROPHYLLUM RHODODENDRON 5AMBUGU5 RAGEMOSA RED ELDERBERRY { • ) 5ORBU5 51TGHEN515 SITKA MOUNTAIN ASH 1\ --- 0 0 R RI f Enmr �..PI°vy iv9 zQ � �I U J o a z z Y O r � • R O r 1 7W Z LU N LPL 0 0 Rr 0 3 I (n z 0 • Q Z J v LL( 10 0 CLIENT DEVCO, INC. c..rnr-- 11100 Mein Street, Suite 301 BELLEVUE, WA 98004 • PHONE: (425)453-9551 � O ._ GALL BEFORE YOU DIO 1-800-424,MS C P H CONSULTANTS She pi drg • CIA FV-d,g Lena USBlUglhJng•iloledYYi(p.re m�m,ew.•se.leolutma.wnferce ::xlmszroi'ue�m7xwar I. SURVEY PROVIDED BY ESM GON5ULTIN6 ENOINEER5, 53g15 IST WAY SOUTH #200, FEDERAL WAY, WA 95003, (425) 415-5144. 2. SITE PLAN PROVIDED BY CPH CONSULTANTS, T33 TTH AVENUE, SUITE 100, KIRKLAND, WA 98033, (425) 265-2390. 3. SOURCE ORAWIN65 WERE MODIFIED BY TALA5AEA CONSULTANTS FOR VISUAL ENHANCEMENT. 4. THIS PLAN 15 AN ATTACHMENT TO THE FINAL WETLAND BUFFER IMPACT AND MITIGATION REPORT PFUEPARED BK TALASAEA CONSULTANTS IN ..ULY 2014. CITY OF FEDERAL WAY APPROVED FORCONSTRUCTTON PROJECT NO. TAL 1422 BY.. DATE: DRAWING (W OF FEDERAL MY, DERAWR NT OF XAIfW K2.0 R/W PERMIT N0. SHEET 5 OF Et RESUBMITTED August 20, 2015 Ann Olsen Talasaea Consultants 15020 Bear Creek Road NE Woodinville, WA 98077 RE: File #13-104418-000-00-UP; KITTS CORNER MULTI -FAMILY Rock Swale in Wetland Buffer Dear Ms. Olsen: NOV 10 2015 CITY OF FEDERAL WAS( CD5 AOlsen maiasaca.corn City staff has conducted a review of the July 20, 2015, Talasaea Consultants Response to Wetland Buffer Impact. At this time, the proposed swale is not approved. Since the storm water discharging from the 24-inch pipe comes from off -site, and the drainage for this 24-inch pipe is within a public easement, the City will review and evaluate the proposed wetland buffer intrusions under Federal Way Revised Code (FWRC) 19.175.040 (3) (2013 FWRC) essential public facilities, public utilities and other public improvements. Under this code section, improvements may be permitted within a wetland buffer, provided "the improvement must traverse the buffer because no feasible or alternative location exists based on an analysis of technology and system efficiency, and the specific location and extent of the intrusion into the buffer must constitute the minimum necessary encroachment to meet the requirements of the public facility or utility. " In order for City staff to further evaluate the proposal, please provide the following information. 1. Provide the information from CPH Consultants discussed in your July 20, 2015 letter, page 5 paragraph 2, pertaining to an analysis being prepared by CPH to determine the maximum expected flow from the pipe. This information should include a recommendation of the width of any hardened wetland buffer intrusion (rock swale), which would be the minimum width necessary. 2. Provide an analysis and information discussing if any potential hydrological impacts to the wetland and wetland buffer could result from this proposed point discharge at the edge of the wetland, compared to the approved plan which proposes a dispersed discharge from the 24-inch pipe at the outer limit of the wetland buffer. 3. Provide a written response how the proposed length and width of any wetland buffer intrusions meet the criteria for allowed public improvements in a wetland buffer as described in FWRC 19.175.040(3) (summarized above). 4. Provide a plan showing how the proposed rock swale would be designed and constructed in a manner that would be an ecological enhancement to the wetland buffer. Ms. Olsen August 20, 2015 Page 2 Since there is no wetland biologist on staff at the City, the City will be sending your forthcoming plan to the City's wetland consultant for review and comment on the plan and to evaluate any potential hydrological impact to the wetland resulting from the proposal. This review will need to be pre -funded by Devco. Upon submittal of the updated plan, we will forward the plan to our City wetland consultant for a cost estimate of the review. Provide four copies of the updated plans, report, and any supporting information. Include the enclosed resubmittal form and submit this information through the Permit Center; please do not mail or email this information directly to me. Contact me by email at 'im.hanis d).cit offederalivay.com or 253-835-2652 if you have any further questions or need additional assistance. Sincerely, Jim Harris Planner enc: Resubmittal Form FWRC 19.175.040(3) (2013 code) c: Steve Sullivan, Devco, stevc.suilivanQdeviceagts.com Ann Dower, Senior Engineering Plans Reviewer 13-104418 Doe. I. D. 70567 CONSULTANTS October 5, 2015 Mr. Jim Harris Planner City of Federal Way 33325 8th Avenue South Federal Way, WA 98003-6325 RESUBMITTED NOV 10 2015 CITY OF FEDERAL WAY CDS Site Planning Civil Engineering Land Use Consulting Projed Management RE: Kitts Corner Multifamily —City File # 13-104418-000-00-UP, CPH Project No. 0024-12-017 Rock Swale in Wetland Buffer Responses to Review Comments Mr. Harris, This letter and the following enclosed information are provided in response to your August 20, 2015 review comments from Talasaea's Consultants Wetland Buffer Impact responses for the Kitts Corner Multifamily project (City file no. 13-104418-00-UP): City Staff Comments: 1. Provide the information from CPH Consultants discussed in your July 20, 2015 letter, page 5 paragraph 2, pertaining to an analysis being prepared by CPH to determine the maximum expected flow from the pipe. This information should include a recommendation of the width of any hardened wetland buffer intrusion (rock Swale), which would be the minimum width necessary. Response: The upstream basin contributing to the 24-inch on -site culvert outfall appears to be substantial. The enclosed map, labeled Figure 1, shows the potential area that may be contributing to the pipe which is approximately 177 acres. To determine the expected flows a detailed analysis of the existing storm system and all detention/retention facilities would be required. We confirmed with the City that an existing basin and facility map was not readily available. Given the nature of the improvements and configuration of the storm system providing the discharge, we have determined it appropriate to consider the peak design flow as the maximum capacity of the existing 24-inch culvert flowing full. The peak design discharge was calculated to be 15 cfs as shown in the enclosed culvert capacity calculations. The 24-inch pipe flowing full would have an outfall velocity of approximately 4.6 feet per second. Per Table 4.2.2.A of the King County Surface Water Manual, the required protection at the outfall should be a 8 foot width (Diameter of pipe plus 6 feet) with a t foot depth of rock lining. Furthermore we recommend a trapezoidal channel of 8 feet in width, with 3:1 (H:V) side slopes, and 12 inch depth of rock lining, for the rock Swale from the outfall of the pipe to the wetland. This will keep the flow velocity just under 5 feet per second when conveying the maximum expected flow of 15 cfs consistent with Table 4.2.2.A (see enclosed calculations). 2. Provide an analysis and information discussing if any potential hydrological impacts to the wetland and wetland buffer could result from this proposed point discharge at the edge of the wetland, compared to the approved plan which proposes a dispersed discharge from the 24-inch pipe at the outer limit of the wetland buffer. Response: The bypass flows from the existing 24 inch culvert would have caused potential erosion issues that were not anticipated due to larger than originally ex ected flows dumping on the property. laoa r mOd�4� ovr �5<•3PhPr %: g1g* swale was installed3} Rd { www.cphconsullants.com Kitts Corner Multifamily Request for Additional Information CPH No. 0024-12-017 October 5, 2015 Page 2 of 2 for erosion measures. The continued use of the rock swale will reduce the potential for sediment transport provide protection for the wetland. These flows were originally directed to the wetland and buffer and once vegetation is established within the buffer and swale it will function similar to the pre - development condition. The approved design provided for a rock reinforced outfall. There was no formal dispersion facilities in the previous design. The location of this discharge was sited in the vicinity of an existing channel that was to be enhanced with the buffer mitigation. The proposed revision for a rock -lined swale at this outfall will result in reduced velocities. 3. Provide a written response how the proposed length and width of any wetland buffer intrusions meet the criteria for allowed public improvements in a wetland buffer as described in FWRC 19.175.040(3) (summarized above). Response: See separate written response from Talasaea, project biologist. 4. Provide a plan showing how the proposed rock swale would be designed and constructed in a manner that would be an ecological enhancement to the wetland buffer. Response. See separate written response from Talasaea, project biologist. Please contact me directly at (425) 285-2392 or by e-mail at Jamie_@cphconsultants.com if you have questions or need any additional information to complete your review. Your prompt response and continued efforts are appreciated. Thank you. Sincerely, CPH Consultants Jaie B. Schroeder, PE V + e President Enclosures Figure 1 — Upstream Basin Map Conveyance Calculations Cc: Mr. Tom Neubauer (DevCo) Mr. Steve Sullivan (Heartland Construction) Ann Olsen (Talasaea Consultants) nj om Z -:'fir t �{ ,,t'i•` •:;' :� �� i i:':...s _i : ';;� •r, �a •� :. .. . �i�' �• i i�: •�r - ._ fir• , . � `' R: - .'Y�� � �l• .. s��•E"' •i .� .t Yr y�Y= fir. ��; '':� f _ ` .. d WIN ' Yr TG •ram _ : �• �. !h � �•: C •.j.i .,%.'•L:�• �, is F +' - �{i' r i• - � - ?'r•:: __ to- •�:; ;] ... �r s? �} ,. - 5 r�' ,9� ram• _ .� •'�i • • _:: '; 'fit: r - .•.' • Y -`S,• NO - �1. r i. 1. dy }�' - •. • = - A.' ::., .+S - _ -`sue Project: Kitts Corner Description: Open Channel Flow Date: 1-Oct-15 Chezy-Manning Equation Trapezoidal Channel Given: Output: Base Width Depth of Flow Side Slope x Wetted Area Wetted Perimeter Hydraulic Radius Channel Length Elevation drop Slope Manning's n Open Channel Calculations Trapezoidal Channels Determine Flow Rate of Trapezoidal Channel 8.00 ft 0.37 ft 3.00 3.33 sq. ft. 10.31 ft 0.32 ft 100 ft 3.70 ft 0.037 ft/ft 0.030 Wetted Perimeter 10.31 ft Wetted Area 3.33 sq ft Hydraulic Radius 0.32 ft Velocity 4.50 fps V5. cfs Design Values of Manning's n Description Base width of Flow line Depth of Flow 1 vertical unit = x horizontal Wetted Area of channel Wetted Perimeter of channel Wetted area/ Wetted perimeter Channel Length Change in elevation Slope of channel Manning roughness constant Conversion 1 cfs = 448.83 gpm :hannel Material n Cast Iron 0.013 - 0.015 Galvanized Iron 0.015 - 0.017 Brass and Glass 0.009 - 0.013 Concrete 0.012 - 0.014 Planed timber 0.011 Corrugated metal pipe 0.024 Natural channel, good cond 0.025 Natural channel with stones & weeds 0.035 Very poor natural drainage 0.060 Plastic or PVC 0.009 Kitts Corner Culvert Capacity Analysis Cxi5�5 Z� Cu.�vc.`� Q = K * AR'/3 * S1/2 n Originial 24" Outfall K = 1.486 n = 0.024 D = 24 inches A = 3.14 ft^2 P = 6.281 ft R = 0.5 ft S = 1 0.014 ft/ft Q = 14.49889 cfs V= 4.61514 ft/s USCS units CMP Storm Drain Assuming full flow 1.4% Slope 10/1/2015 Project: Kitts Corner Description: Open Channel Flow Date: 1-Oct-15 Chezy-Manning Equation Trapezoidal Channel Given: Output: Base Width Depth of Flow Side Slope x Wetted Area Wetted Perimeter Hydraulic Radius Channel Length Elevation drop Slope Manning's n Open Channel Calculations Trapezoidal Channels Determine Flow Rate of Trapezoidal Channel 10.00 ft 0.32 ft 3.00 3.54 sq. ft. 12.04 ft 0.29 ft 100 ft 3.70 ft 0.037 fUft 0.030 Wetted Perimeter 12.04 ft Wetted Area 3.54 sq ft Hydraulic Radius 0.29 ft Velocity 4.23 fps Design Values of Manning's n Description Base width of Flow line Depth of Flow 1 vertical unit = x horizontal Wetted Area of channel Wetted Perimeter of channel Wetted area/ Wetted perimeter Channel Length Change in elevation Slope of channel Manning roughness constant Conversion 1 cfs = 448.83 gpm Channel Material n Cast Iron 0.013 - 0.015 Galvanized Iron 0.015 - 0.017 Brass and Glass 0.009 - 0.013 Concrete 0.012 - 0.014 Planed timber 0.011 Corrugated metal pipe 0.024 Natural channel, good cond 0.025 Natural channel with stones & weeds 0.035 Very poor natural drainage 0.060 Plastic or PVC 0.009 4.2.2 OUTFALL SYSTEMS T.4 BLE 4.2.2.A tlOCK PROTECTION AT`OUTFALLS Discharge Velocity REQUIRED PROTECTION at Design Flow (fps) Greater Less than Minimum Dimensions(') than or equal to Type Rock lining (2) Thickness Width Length Height 0 5 1 foot Diameter 8 feet Crown + 6 feet or + 1 foot 4 x diameter, whichever is greater 5 10 Riprap (3) 2 feet Diameter 12 feet Crown + 6 feet or + 1 foot or 3 x diameter, 4 x diameter, whichever is whichever is greater greater 10 20 Gabion As required As required As required Crown outfall + 1 foot 20 N/A Engineered energy dissipater required lil These sizes assume that erosion is dominated by outfall energy. In many cases sizing will be governed by conditions in the receiving waters. (2) Rock lining shall be quarry spalls with gradation as follows: Passing 8-inch square sieve: 100% Passing 3-inch square sieve: 40 to 60% maximum Passing 3/4-inch square sieve: 0 to 10% maximum (3) Riprap shall be reasonably well graded with gradation as follows: 1 Maximum stone size: 24 inches (nominal diameter) Median stone size: 16 inches Minimum stone size: 4 inches Note: Riprap sizing governed by side slopes on outlet channel is assumed to be approximately 3:1. 2009 Surface Water Design Manual 1/9/2009 4-31 TALASAEA CONSULTANTS, INC. 8 October 2015 Mr. Jim Harris Planner City of Federal Way 33325 8th Avenue South Federal Way, Washington 98003 RES03MITTED NOV 10 2015 CITY OF FEDERAL WAY CDs REFERENCE: Kitts Corner Multi -family (File Number 13-104418-000-00-UP) SUBJECT: Rock Swale in Wetland Buffer Response to Review Comments Dear Jim: TAL-1422 This letter and the following enclosed information are provided in response to your August 20, 2015 review comments regarding the rock -lined swale within the buffer for Wetland 1 of the Kitts Corner project. As you recall, an existing 24-inch stormwater pipe drains through the buffer to Wetland 1. The currently -accepted buffer mitigation plan called for the removal of non-native vegetation from the buffer (including that portion of the buffer between Wetland 1 and the 24- inch stormwater pipe). Storm events during October 2014 caused an unanticipated volume of water to be released from the stormwater pipe. This resulted in severe erosion and rilling with a heightened potential for unintended sediment deposition within Wetland 1. The project contractor installed round river rock to create a rock -lined swale to prevent further erosion and movement of sediment to the wetland. This work, while successful in its purpose, was not permitted by the City, based on the approved development plans. Therefore, the City is requiring that we demonstrate that the rock -lined swale meets the requirements outlined in §19.175.040(3) of Federal Way Revised Code (FWRC). The comment letter from the City contained four numbered items that must be addressed. Items #1 and 2 concern engineering and design aspects of the project and have been addressed in a separate letter from CPH Consultants dated October 5, 2015. We are providing responses to Items #3 and 4 below. We have provided the text of the comments verbatim in bold print (including the text of FWRC 19.175.040(3)). Our comments to the items follow immediately in italic text. We are also providing figures that illustrate design concepts for a revised rock -lined swale that fully meets FWRC 19.175.040(3) and the concerns expressed in Item #4. CITY OF FEDERAL WAY STAFF COMMENTS, ITEMS #3 AND 4 3. Provide a written response how the proposed length and width of any buffer intrusions meet the criteria for allowed public improvements in a wetland buffer as described in FWRC 19.175.040 (3) (text provided below) "19.175.040 (3) Essential public facilities, public utilities and other public improvements. The director of community development may permit the placement of an essential public facility, public utility or other public improvements in a regulated wetland buffer if he or she determines that the line or improvement must traverse the buffer because no feasible or alternative location Resource & Environmental Planning 15020 Bear Creek Road Northeast* Woodinville, Washington 98077 * Bus: (425)861-7550 Pax: (425)861-7549 Mr. Jim Harris S October 2015 Page 2 of 5 exists based on an analysis of technology and system efficiency. The specific location and extent of the intrusion into the buffer must constitute the minimum necessary encroachment to meet the requirements of the public facility or utility." The discharge point in question is an existing condition of the site. Water from two locations are commingled and discharged from the 24-inch pipe into the extended buffer area north of Wetland 1. The discharge of water prior to development occurred within a buffer area vegetated with herbaceous plants (grasses and ferns), some shrubs, and few trees. The soils at the point of discharge are Alderwood-Everett gravelly sandy loam soils, which are moderately well drained to somewhat excessively drained soils. The combination of vegetation and coarse soils allowed for dissipation and infiltration of stormwater discharges from the existing 24-inch pipe. The proposed development plan for Kitts Corner involved extensive restoration and improvement of the buffer for Wetland 1, including the area of the existing 24-inch pipe's point discharge. The originally -approved site plans called for the installation of a quarry- spall dispersion pad at the discharge point of the stormwater pipe while the remaining buffer area between the pipe and the wetland was to be grubbed to remove invasive and non-native species, garbage and debris from homeless encampments, and replanted with native trees and shrubs. In October of 2014 after initial site clearing and grading work within the buffer had been completed, a series of rainfall events occurred in the vicinity of the Kitts Corner project. The volume of water expressed from the 24-inch stormwater pipe exceeded anticipated volumes and the ability of the riprap pad to disperse flow energies. The result was erosion of soil and the development of a channel as the water flowed downgradient to Wetland 1. The amount of water and sediment being transported towards Wetland 1 exceeded the capacity of the installed silt fencing to retain. Subsequently, the silt fencing affected by the flow of stormwater was knocked down. Under these conditions, it was very likely that sediment -laden stormwater would flow into Wetland 1; a situation that required immediate rectification. The project contractor imported round river rock to fill in the eroded area from the 24- inch pipe's discharge point down to the edge of Wetland 1 (the rock -lined swale). The purpose was to prevent any additional erosional flows that could cause unintended wetland fill. Based on the condition of the rock -lined swale after the end of the rainy season, it appears that the rocks, as placed, are sufficient to withstand most all potential flows from the 24-inch stormwater pipe. The current location of the rock -lined swale is the result of existing patterns of water flow through the buffer, as shown by the erosion and channeling that occurred during October of 2014. The existing width of the rock -lined swale appears to correlate with the general width of the prior erosion and channeling. The average thickness of the rock is approximately one foot. We believe that the current rock -lined swale meets the requirements of §19.175.040(3) as designed. The rock -lined swale represents an emergency improvement of an existing condition. The location of the swale is dictated by the actual flow path of water from the 24-inch stormwater pipe to Wetland 1. No alternative or feasible location exists since Resource & Environmental Planning 15020 Bear Creek Road Northeast • Woodinville, Washington 98077 • Bus: (425)861-7550 Pax: (425)861-7549 Mr. Jim Harris 8 October 2015 Page 3 of 5 the current location of the rock -lined swale represents the natural drainage pathway of stormwater as dictated by site topography. It is likely that the rock -lined swale does not currently constitute the minimum necessary encroachment to meet the modeled flow characteristics from the 24-inch stormwater pipe. Minimization of the rock -lined swale will be addressed with our response to Item 4 of the current staff comments. 4. Provide a plan showing how the proposed rock swale would be designed and constructed in a manner that would be an ecological enhancement to the wetland buffer. According to the data provided by CPH, the peak design discharge for the 24-inch culvert was calculated to be 15 cfs. The 24-inch culvert flowing full would have an outfall velocity of approximately 4.6 feet per second. Accordingly, the required protection at the outfall should be an 8 foot width with a 1 foot depth of rock lining with 3:1 side slopes. The rock -lined swale as it currently exists is between seven and ten feet wide with 1 foot depth of rock lining and 3:1 side slopes. It is apparent that the width of the 3:1 slopes exceeds ten feet in some locations. Also, the contractor placed two large down logs along the left bank of the swale to aid with energy dissipation during large storm events. In addition, there appears be rock placed on both sides of the 24-inch culvert in areas that will likely never receive any water from the discharge pipe (Photo 1). Photo 1: Rock -lined swale as it currently exists. Resource & Environmental Planning 15020 Bear Creek Road Northeast • Woodinville, Washington 98077 • Bus: (425)861-7550 Pax: (425)861-7549 Mr. Jim Harris 8 October 2015 Page 4 of 5 We believe that the rock -lined swale can be easily redesigned in the field to provide the minimum amount of intrusion into the buffer and provide both habitat and aesthetic value as well. Therefore, we propose the following remedial actions, as illustrated on Photo 2 and Sheet W2.0 (enclosed).: - The existing rock -lined swale be reduced in width to be no less than seven feet wide at its narrowest, and shall not exceed 10 feet wide at its widest point to create a more sinuous channel. The excess rock will be removed from the buffer. -- The existing rock along both sides of the 24-inch culvert shall be removed so that the start of the rock lining is generally flush with the terminus of the pipe. -- Place two large boulders between the pipe's outfall point and the existing down logs to help attenuate flow velocities and energy and deflect flow away from the swale's left bank. -- Plant the new edge of the rock -lined swale with native shrubs, such as red -osier dogwood, black hawthorn and salmonberry, to increase bank protection above the rock swale, help disguise the outfall pipe and to provide habitat. Photo 2: Rock -line swale with proposed redesign. Reducing the width of the rock -lined swale and planting with native shrubs will improve the ability of the buffer to provide habitat functions to various species of birds and small mammals as well as providing a visual amenity to the community. In addition, the rock - lined swale and deflector boulders will help reduce flow energies of the stormwater and prevent the mobilization of sediments that could cause unintended filling of Wetland 1. Resource & Environmental Planning 15020 Bear Creek Road Northeast • Woodinville, Washington 98077 • Bus: (425)861-7550 Pax: (425)861-7549 Mr. Jim Harris 8 October 2015 Page 5 of 5 NOTE: The "Approximate Wetted Edge" was determined by visual evaluation of photographs. Areas identified for rock removal represent those portions of the swale that exceed the necessary width of the swale, or in areas unlikely to ever be affected by stormwater flows. Actual areas for the removal of rock will be determined in the field based on swale width measurements and flow characteristics. The boulder placement shall be determined in the field at the time of installation to provide the maximum amount of flow attenuation, balanced with flow deflection away from the left bank of the swale. We trust that the information presented in this letter and the letter from CPH Consultants dated October 5, 2015 have sufficiently addressed your comments to allow the rock -lined swale to remain in the wetland buffer with the proposed redesign noted above. If you have any comments, questions or require additional information, please contact Ann Olsen or me at (425) 861-7550 or by email at: dteesdale(@talasaea.com or aolsen talasaea.com. We appreciate your continued efforts in reviewing the need for an allowed public improvement in the buffer for Wetland 1 at the Kitts Corner Multi -use site. Thank you. Sincerely, TALASAEA CONSULTANTS, INC. for David R. Teesdale, PWS Senior Wetland Ecologist Attachments: Sheet W2.0 cc: Tom Neubauer and Steve Sullivan, DevCo Inc. Jamie Schroeder, CPH Consultants Resource & Environmental Planning 15020 Bear Creek Road Northeast • Woodinville, Washington 98077 • Bus: (425)861-7550 Pax: (425)861-7549 ASIT241217 - arch CSIT241217 - eng WETLANDS TOPO EX. CONDITIONS CBLA241217 CUS0241217 CUWS241217 CGRD241217 5 556TH STREET SEC. 29, TWP 21 N, R4E WX BLA .77 I ( r I ' ._ _ __ E?f15TiH64RAVL'L MAINTENANCE ROAD MIP) EXI5TINS 5TORMWATER FACILITY l €XISTINS CONDITIONS PLAN CARAPHIC SCALE TM (IH FAT) 40 80 1G0 5CALP, 1"-&0' 7 IF Iti — �r — — PLANTINS LAYOUT KEY Lr7i7Af7IN FE SCALE ❑ !00 200 4 SCALE. I"=200' EXISTINS SUPPER VESETATION M05TLY 6RAS5 SPECIE5 WITH SOME NON-NATIVE/INVASIVE SHRUBS �`- `� E • '� MIXED FORE5T, MOSTLY DECIDUOUS TREES AND • �. ,v SCRUB -SHRUB SPECIES RELATIVELY MATURE DOUGLAS FIR FOREST WITH TYPICAL 5HRU5/GROUNDCOVER UNDER57ORY 17��J■4��:� — — _PROJECT SITE BOUNDARY EX15TINS WETLAND — — — — —WETLAND BUFFER . ..... — • •—EXI5TIN6 STREAM CENTERLINE EXISTING CONTOUR .,`�.. APPROXIMATE BOUNDARIES OF EXI5TIN6 VEGETATION, aetermined by revlew of 6006LE EARTH (SA4AW and BINS MAPS aerial Imagery. .vll; INITY MAP NT5 PROJECT 51TE . SOURCE: 6006LE MAPS, WWW.MAP'5.6000L.E.COM (ACCESSED '1-3-2013) APPL3GAKiLPRD.gL2_DY$�6 NAME, DEVOO, INC. ADDRESS: 11100 MAIN STREET, SUITE 301 AEI I EVUE, WA g8004 PHONE, (425) 453-g55I CONTACT: TOM NEUBAUER SURVEYOR NAME, E5M CONSULTING EN6INEER5 ADDRESS, 33g15 I5T WAY SOUTH #200 FEDERAL WAY, WA g8003 PHONE, (425) 415-5I44 ENGINEER NAME. CPH GON5ULTANT5 T33 TTH AVENUE, SUITE 100 ADDRESS, KIRKLAND, WA g8O33 PHONE, (425) 285-25g0 CONTACT, MATT HOUGH, PE ARCHITECT NAME, R055 DECKMAN R ASSOCIATES, INC. ADDRESS. 201 FOURTH AVE. SE PUYALLUP, WASHIN6TON g83'12 PHONE, (255) 840-g405 CONTACT. R❑SS DECKMAN, AIA ENVIRONMENTAL CONSULTANT TALA5AEA CONSULTANTS, INC. NAME, ADORE55, 15020 BEAR CREEK RD. NE WOODINVILLE, WA g8OT7 PHONE, (425) 861-1550 CONTACT, ANN OLSEN, SENIOR PROJECT MANAGER DAVID TEESDALE, PW5 WI.I PROPOSED SITE PLAN, IMPACTS 8 MITIGATION OVERVIEW PLAN WI.2 CLEARING, 6RUBBINO b HABITAT FEATURE PLAN 4.3 DETAILS N2.0 PLANTING PLAN N2.I PLANTING PLAN N3.0 PLANT SCHEDULE, DETAILS 4 NOTES W3.1 PLANTING SPECIFICATIONS 4) cnLL ae�oae rou olo �.soo� sees NOTES CITYOFF6DER.4L WAY I. SURVEY PROVIDED BY E5M CONSULTING EN6INEER5, 33g15 IST FOR CONSTRUCTION WAY 50U7H 4200, FEDERAL HAY, WA g8003, (425) 415-5144, APPROVED 2. SITE PLAN PROVIDED 0r CPH CONSULTANTS, 70 TTH AVENUE, SUITE too, KWLAW, WA qW", (425) 255-23AIO. BY: DA7E' 3. SOURCE DRAWIN65 N RJ» MODIFIED BY TALASAEA CONSULTANT5 MY OF PTSM MY' OFPA2DOIT OF FEol~ FOR VISUAL ENHANCEMENT, 4. THIS PLAN 15 AN ATTACHMENT TO THE FINAL WETLAND BUFFER PAvPERhffNO, IMPACT AND MITIGATION REPORT PREPARED BY TALASAEA CONSULTANTS IN JULY 2014. fl9 cnnr„¢�, sou - •d,.."". cn".,,u,n,., m" All ¢yw. tl..nA. z O W Resource d e„m.on,n.nt., CLIENT DEVCO, INC. 11100 Meln Street, SuRe 301 BELLEVUE. WA 98004 PHONE: (425)453-9551 g CPH CONSULTANTS SMPWnnin6, O,tl Enonaeint LeM INa CbnuNN � PmIe0.lMroKment ry mm.nw, exu,ro I NAW6N'nPo411 vw,xi��s omsauo i naiaw mveu OJECT NO, TAL 1422 AWING II,wI r\I.O SHEET —LOF� ASIT241217 - arch CS17241217 - eng WETLANDS TWO Ex. CONDITIONS CBLA241217 COSD241217 CUW5241217 CGRO241217 SEC. 29, TWP 21 N, R4E W.M. 5 55&TH STREET D L+sc eu+m'o r 1 if A .n 1 "I VEST HYLEBOS TRIBUTARY 00014A RAISED �(+ OVERLOOK r. PLATFORM .RMAWINIS WALL _ • :. ; •(5EE CIVIL-PLAN5). - • - I I \yy • - •� W3 EX SANITARY . _ WOOD. &HIP _ - • • _ . -v . SEVER W/ ' . ' . ' ` - . : TRA L, TrP, : EASEMENT ! _ - cI3,,32d 5F ON -SITE � , ` � . ` � � SLA CATEGORY H ` - - ' _ H r • Gh•'TE6DRY•Ir, • � � ' 'may_.—::�._:�� •.�._•�_--� TTZENC.H, TYP. ' I j GIVtL i I j 1 PLANS)+�► i 1NETLND BUFFER INTRUSLONS { MINOR 6RADIN6 FOR HALL CONSTRUCTION, 646q SF 0 5PER510N TRENCHES AND SITE GRADING o Q PEDESTRIAN TRAIL CONSTRUCTION 3S6"i SF s, r .. _ _ _ _ -- - • - - 1 - I L CLEARING/GRADING LIMITS PER CIVIL PLANS n� � ! I N TLhN� STF1.A. AND W042n0e0 PLAN LEGEND PRO_ECT 517E BOUNDARY + ■ A C. _ 71 EXISTING VETLAND — -- — — — VETLAND BUFFER/SECURITY FENCE _. .------------- �- -�•• —•••— EXISTING, STREAM CENTERLINE 15TIN STORMHATER FACILITY ,II� �Il [ I I I PROPOSED SITE PLAN, IMPACTS 4 MITIOATION OYERYIEW PLAN GRAPHIC SCALE ( IN FEET) SCALE, 1"•60' BUFFER MIT16ATION Lrz&rzND BUFFER RE5TORATION FOR TEMPORARY CONSTRUCTION I MPACT5 AREA A • BUFFER RESTORATION 6,46q 5F RESTORE DISTURBED SOILS WITH COMPOST OR IMPORTED TOPSOIL, IF NECESSARY. • STABILIZE DISTURBED SOILS WITH 3-INCH DEPTH OF BARK MULCH. • RE -VEGETATE ENTIRE AREA WITH A MIX OF NATIVE EVERGREEN AND DECIDUOUS TREES, SHRU65 AND GROUNDcoVER5._ TOTAL BUFFER RE5TORATION: 6,46q 5F BUFFER ENHANCEMENT IN FA551YE OPEN 5PAGE AREAS AREA B BUFFER ENHANCEMENT 18,25q 5F GRUB ENTIRE AREA BY HAND AND/OR MACHINE TO REMOVE ALL IWA51VE SPEUE5 AND REMOVE ANY TRASH AND DEBRIS • RESTORE DISTURBED SOILS HITH COMPOST OR IMPORTED TOPSOIL, IF NECESSARY • INSTALL HABITAT FEATURES SUCH AS DOWN LOGS, STUMPS, AND SNAGS HITH SHALLOW NEST BOXES STABILIZE DISTURBED SOILS WITH 3-INCH DEPTH OF BARK MULCH REVEGETATE ENTIRE AREA HITH A MIX OF NATIVE EVERGREEN AND DECIDUOI TREE5, 5HRUB5, AND GRGUNDGOVER AREA G BUFFER ENHANCEMENT 4055 5F ENHANCE EXISTING MIXED FOREST VEGETATION BY PLANTING CONIFEROUS TREES AND SELECT SHADE -ADAPTED NATIVE LARGE SHRL65 AND SMALL TRE•5 TO FILL IN MID-5TORY AND UNDERSTORY STRATA INSTALL HABITAT FEATURES 5UCH AS 5HALLOH NEST BOXES ON EXISTING TREES, AND LARGE HOODY MATERIAL SUCH AS STUMPS AND DOWN LOFT WHERE EXISTING NATIVE VEGETATION HILL NOT BE 015TURBED AREA D BUFFER ENHANCEMENT 11,4154 5F P ENHANCE EXISTING CONIFEROUS FOREST VEGETATION BY PLANTING SELECT SHADE -ADAPTED NATIVE LARGE SHRUBS AND SMALL TREES TO FILL IN MID -STORY AND UNDBLSTORY STRATA • INSTALL HABITAT FEATURES SUCH AS SWALLOW NEST BOXES ON SELECT EXISTING TREES TOTAL BUFFER ENHANCEMENT: 54,646 5F CRITICAL AREA SIGNS, SEE DETAIL I� 2-50ARD FENCE, SEE DETAIL Wig BUFFER BOUNDARY HITH SECURITY FENCE, TBD BY OWNER P 5 OPgN 5PACM /,-.• -.-f PROPOSED PASSIVE OPEN SPACE IN BUFFER (INCLUDES TRAILJ, SEE OPEN SPACE PLAN ON 517E LANDSCAPING, PLANS PREPARED BY TALASAEA CONSULTANTS FOR OPEN SPACE REWUIREMENT5 3gb-Iq 5F I Q Vp-I RAISED OVERLOOK PLATFORM' TO VIER I-EMAN12 I HITH INTERPRETIVE SIGN--, BENCH, 4 TRASH RECEPTACLE WETLAND BUFFER VIEW POINT H1TTH INTERPRETIVE SIGN••, BENCH, TRASH RECEPTACLE WETLAND BUFFER WOOD CHIP TRAIL, SEE DETAIL p.�p EXISTING GRAVEL • SEE DETAIL w� FOR OVERLOOK PLATFORM MAINTENANCE ROAD (TYPJ •• SEE DETAIL WIC FOR INTERPRETIVE SIGN 0 cFLLL serolue Sou oIo 1•lt10.4240EE0 NOTES C[TYOFFEDERAL WAY I. SURVEY PROVIDED BY E5M CONSULTING ENGINEERS, 53g15 1ST WAY SOUTH 4200, FEDERAL HAY, HA g8003, (425) 415-5144. APPROVED FOR CONSTRUMON 2, SITE PLAN PROVIDED BY CPH CONSULTANTS, 155 9TH AVENUE, SUITE 100, KIRKLAND, WA gb033, (425) 285-25gO. 5, SOURCE DRAHIN65 WERE MODIFIED BY TALASAEA CONSULTANTS SY: DAM FOR VISUAL ENHANCEMENT, OW OF FWW MY. OMRW 11F FINMI1q 4, THIS PLAN IS AN ATTACHMENT TO THE FINAL WETLAND BUFFER R/NPERNTNO IMPACT AND MITIGATION REPORT PREPARED BY TALASAEA CONSU1_TANT5 IN .ULY 2014. Q C•pyrlpGl pplA TnlunnP t'•nuullnnN. Ipr, All 10•• pr•n••i z 0 N I CONSULTANTS..a�INC. Rcad EnNronm•nlel PI•nnlnp ••�i..,ne. I,n.rw r_ Y DEVCO, INC. ,,,yLly,u„w 11100 Meln Street, Sulte 301 BELLEVUE, WA 98004 PHONE; (425)453-9551 g r: CP�H CONSULTANTS 4, RPnPeW • 04 Egmdr4 teM lheLarauNnl • Aq•nwnermed tp TP,w•LBi• IW NYPY„GwllPy] pAp,a....P......flxlVGaeS]JB •• epnrul,rnlr arm 'ROIECT NO, 4 TAIL 1422 p 1 i RAWINO SHEET-2,OF a ASIT241217 - arch CSIT241217 - Ong NEILANDS TORO EX. CONDITIONS CBLA241217 CUSD241217 CUWS241217 CORD241217 SEC. 29, TWP 21 N, R4E W.M. GLEARIN6. SPRUBBINO 4 HABITAT FEATURE PLAN 6R?tPHIG SCALE NORTH ( IN FEET ) D ! 30 SCALE,"=30' NOTES FOR GLEARIN6, 6RUBBINO 4 HABITAT FEATURE INSTALLATION PART I, ISEfER-AL 1.1 SEQIENGNS aaaneratr lruatren, 1. Contractor shall ghm Tolosasa Cpreultalts a minim m of ten 00) dap notks prior to beginning corstructlon. 2. No [,A,F yoLlOn Hofr shall CWIn',afxa uMll t1w Is a And" b6LH*an 00 ctIoni TakabaxaO Caesitausc gerrroS ctearh% adJa• sertwx!<carllracla-s. rod IM larKWApv c04r04ar- Tha app•wad plots ar4 specRKatkra shall be nvlewac! to snouts Not all =6.m 11++aMed wderskarla Ihs Yllark vie the spa4 K dataq* raLolaa W Ind. Faetreatlan d"AAAhe 4s. speaaro¢brN Fad sits cd+NpelVs. 9.Lolo;mw W axlslklq uf.1W" how bean eRWOMhed bj flws field y Or OKOh.d firers rl ark]b1s M""% and Hhavid be ad apt"AM Pie or-N anA WE me 011110 >y "FmP40te. It N Ne sole r"Poesviltq of tM eo,&GAo r W, N slaapWl*ftq .vEy ute z<�^; of loamy waetwa axe l21 dbccve ar and avmd ag ntartne wFthh the Anveatba plan oFnd0 that Oro not thwA tut +Illdn may w wractad 4 =Im;,WMouOm of "no Film. a461 ai"a to to 6lsar4 mdrkad h Ow Vold, TolasPav 6*r 'Lies nO1r rnvta.a as'Y s WI a Cmallo" with the cpprawd Fr a6�01vNT plan prior to start of lEoOlu-uGlat 4,A of Lob etas nteL be m eird wh ndK V n*WWAlm Is n Pet a and Mall roman on end ir1ZJl Fe`a uJlrplit&n S. Comtruetkn mot ea peHaead 1n saferaasKe% wRh O11ho0.0a % mladwcK mLdlk canes, Pf"A" emnana.. arlgkr other aRptY,sEle prdlrK a. and pa Lens, &.The pro]sct o"naNaC� dmt is reaporrbW for dWdhhy Kay afoot ralawa o• ragv»d prm4e PrW to the fta-1 of r-c.niruplle+.t T. A qualified As stall be m site, oo necoo-J, to rrlanllor mRlgatbn corst-tlon and approve moor eatiors to the plan. 6. D.r1' j cmetrualbry tltl eOrYrOatOr aN! u►a lNLerlal/ RM Gatsir su n awces V'4t TFavant l lo. Tutelar -are �,d Outer palyta4e from ryddrNg aAtlt�ptbn W or otliar rGGral watenH of lYg alafa. q.FFerema, n nlaafr.-as shall be wad to prai"t oxbtklg stern &OWORG s k".6-F*Lng wNlns. a" roads. 10.T1ts can.raotar moll F`4V`d* tedium! ad araeW control. around the project area prior to toll A.batre trim oarewatlm actNlkg. B.t$IµEY�.L�slGSlete he w8GLI*m pravtaes the geeeraJ *vR o or octivnlas aanjppWd w Loa nacemaay to [+]n[plsW thN n*LSgoLNn project- r at Lrrea ocbvltfas trot ne rartwamd cmcv.enty o+ fhb projacL progress", I. C;OO t a a1w mmaLkg between the Gentracter, YassAaea Cawnmts, old one C6 r0rb rep-asa .tf xx to revlow rho project plan. 2.7trvsg &Fmarir g Imga. 5.kakall slit fence and ant other arcabn old "clknentatlm o ntrol Br4Ps nao imarll for work In the mNkgata. arpem- 4.Glecr and gap-acku rshnastve vagstot Lon from Wffw 5.krkall'x"aa. 6,Am.rd stet o'na place legs wvopg mawrnl. T, CCsspVae peda trdn tNtwrkaca troll RdW rxNter. B,CafeWca a Ioab I Felon be,0" and alterprOlh'n slge. 9.Cmplate m" cleayp ad Lstdl plod mowrlai as kdlcated m The Butler Hhlgatbn Plmthg Piet. 1ONatalt .pm -roll Para ale 6rlaaai mev algns. 1.2 PROJECT C0WIT10MB a CGmMcter shall armp-a that c Airul tiro raiatw muvltlpa ap W. daroga arf-bua ra,lWvA or ad UcaA vagetatlm. tolasasa ca ri Banks Wan be rWnbd srvladiolaq H o Idmwt dalaga OL6lry- ronte"tor anal) ex Nan that adjpcpR r*gas ore mantoknd and rgpi Gnear W salt bdlOr attar Cie" at all L"b ckt" caxwtution, CAWA ar fIG11 Carey HIM Rs gaA+prnfg gfl.dlelklnlH wdao rogaakg ."at ma'n.a.: l&ioankxy dreg carrtrneiWat B, /ry rhaVa6 a s,dEJI,attae w the mClg%lm ecR plat a- spKdlau mace taco w prior approval hrom ar sultry rsproeadothe., Tolaeaaa CZftwk1arVA, ad applicable agsw lbs. ID WARRANTY A, A EaMraetaf-prmi~ Iwrr0A." doll 6d0rd far v Period .f ma par fron pro dale a pty.rwl cae"LW1- "'P"l corylletkn for the WM* or UW *"Alan M Lots data Aran oil cFea-ngrq�Ippn} htNlal teaaw,a pMcansnl, P Kj- wnP°'p-Y Pr&s9e0tim az.mphw 0 wh Mork u Ca Ilms. pod appllsaNa cm? All *' PART 2, PROPICTS AND MATERIAL5 2.r HABITAT FeATI::P1' a SA.Vla. Meting Bore* 1. Swallow naetng i. a wW ,loll be a Irw;Wd of &odor Or cypress. 2. CantrmLor Ixx y, p,rahese 6HOlow rsetrg ba9e6 at a.Tolasasv Gaeultmts, (4251 661-1350 Or. b.Seattle AadApon Soclsbj, (206) 525-44M or, ..Aid Birds atllrnited, (206) 515-4001 B. = 9.roga attalI be cedar or fie species, 24-55 Fast "WWN a mhhum of eightmah braKMs, and o mATsrun dk.rxe4s' of 20 fiches at g•olad level Low :sW c. f]aat ear. LaaAn tag shoo Loa coda m f:' bpacrs I, beak a 20 fiat! vds+th length, bea o t holl Fools. and p mhlrun alaltvtar of 10 trlcHles. Bak shoo w kept tract Es thnk have Loaner and shall be dletrell"d and not blMt. 0.r 5hnyre shad w emar paL-dseojea, roiocCAc t4 rim ar cut lam rodtwm WN a mW,m N q Tres feet al Lrtxw, 70 fiches in tlraro mrl„a.r,, Emm WE haw been put sh.11 LA. distressed Ord rot blwlt. E. Boulders, I. LA- boulders L l rsd from .-It. gaping aparalIaea, If a.-mlara. 2.Ons Or two -person in sloe with twelve k Jtie n*Anu , tila,nter, 2a 50fer-SURFACE PATH A. hall n,rf-Mg shall be clean w..dchIp.. See detail m mRlgatlon plane. 2.5 TOPSOIL A, mmuww. ranee 1 ttat nos barn steekplad os-&U for evertm s in proj"t araa(s) sr trporlad frooff-eNe new Ytn34 t s .a6nlbhere fu`foca boll. free of w:w�IL cloy knee, WI-sk.664*, roots, ytil/pe, = r[Jsl' Ihaf I neh n ay OMblilli ICW r Or Qhj otMr olrtra+salA ar Loltk. matter hamNl B. Q + tessera. Isported topsoll shall &orslet of org-V materials arond6d as feceswy W produce IWk orr��IK r omtent of at Ismt 10 percent and not greater than 20 pm"All, of Wtor"ml by 9HTfT-t41. 2.4 MIL-GH a Bark a I+epdotnp mulch shall be darted Iralrl DongLm fr, pha or hamla&k mpe&a*. TM nvlrh shotl opt HOW4 reskl tank a other conpowlds In q-tiLlo , UW. lr W Los datrrrxsrlkd tO aOrxpl, plant IRE a HOW q+aub,. B, Mkh A Loa gvun7 sO ltal o mm- at'15% of the materbl HIII pass tfua 0 a 1.5-hrh sbw and Flat mp-a that 55A try ippsa wk.,na. will pass tlrovo a US No. 4 slave. PART S. e)r.=ON A."ym, ,..,vent-..^ Rl + rl,wl. of Glen-, I. Pride to ay em few, t ion, a Ila4rum,p e^wor Hap =wvey' *Lace. and Nag okfa-Ltg knits. Claarkg Imv ore aq*A d m Na n,INgotbn plats- Tukwa Cen.e!tml0 PAali revnw One oppraw flaggng Of c Itnits prior W Ovy vegetation rsmpWt It Is ale ryspp to 4j of the &onb- ooe to We and mEAd focatk" or w9atatbn to be swGd"ro"t utx Toknoaa Carnultmts modIN fhs gotta+ plan are f elEetel" to a W air slq%fkox matte wgeto W- 2.CeRraeler Hlall W-Oft Ne Center Fine al prapoW [tall, To "GOO Cmwxllmts will Vim fnvlam and madlfy trdl dhgx t an rncas.a*a'y w awsa ObVtbonse OF "im" ovlkmt Staab -He Leaaf .ttd1 be YUAaxeO per trail 4on.4uCLom B. I. CaW kv *hofr to rn.parabla to OW" alst rbawe to e.W" "tatim located aAlalde the Car„AhgAa&s- , No -1 Of aN w9atotion tell occur without prW a p'avnl N Tatpsnfa 2.7rolceosa d~La3* shall IkJg 0lasU19 VagOtaklan to rm>dA leealsO Irehn the arsati Pk'x)getl vLwga Wtlon sh 11 rcd W othrOrd, misa, tgpraved In He" by TOIOSOL,a lets. S.LOAroctrr HxPf evera m r4ra to prswat"to the tevk mole, end t .hse d [ream and Mna. w roman. Aryl wodj plat W mmah Nal le damaged dtrrq cmw;rt* m .Karl be wooled krrxaaate C 01 oeru a. mW Tolmeaeo wAlaTte 64;1 be -Alhod ar m$denL Dan*" VACk'n," Thal Mckds awn wtlrg brcten b &%I**, baron roots. 0-4 Man gad veep bo4c MgXad piornis >hpll w alp q.�lh� and addltw JI msgylres stpll be talc , an, q*f0PriaL!- to ad n p{alt WY1W1. c. L f:4mrpctm stool! setoff slit f 0ec where *hall m On =**M1r n prior to 0 IOM of fan &on*tmrllC G Alb vy- shall Moll q lxoh /rglmra or s osNon ss Mall (pnplsllut a cQlsfneiien Temp k q mimtabe NnR v 0 10 approve laaatNre of erntarh ,;antral rrledsAre. prim te canl.nla targ hall w n e oro4on o 2. Cmlro&tar 4AOIn mewoh etwlcrn GMral rneapl,Yes Far alpn A4ark shell bo near` • _' Hsh erWlon antral for CMr 61LO Hark M nxwssay. Thmse dreg m l rannah In place trill aA},alratbn N glwn by Taklsaea ureullolds fa reaovd d location odjrsbhsr,l IL Y the rsspasbFeW W Its cmwocta fd nantxan 011 enptla+ callroI men " aajocaat t* sarry areas Prim amlerla by Tolo6meO S. A► cotatvction gr s ard seasarni eamdtkre dMOW, oration 4gile"l focleua. snp[I w manLOlvd odfpr�Glbred as rsgNead dJ ralaecaa Con"gora to Nacre rAMksvd erOsvrw:.T� axon carrol. 4.1'11here possible, rwtural god cover vegetation *hall be mantolned far erosion omtrol, D. 1. Canvactar Null yW aA with mpl,h" all nHrrollW aE slroslve vegstatkxl withh buffer mlkgmtlan ELAN ND PROJECT 517E BOUNDARY C. EXISTING WETLAND WETLAND 5UFFER/5EGURITY FENCE � �"• - STREAM C1-RIO-S NE r EXISTING FOREST/SGR718-SHRUB EXI5TI N6 VEGE7ATION Area B as shown an the mlVgatlm plain (Sheet HI.U, with the exception of (lagged exist" Wvkatbn to ramaln. MCaitrpctot Vol gW Opt N I-" oil n,m-aFtIw one nwow vegetation w11M MHar rNLigatbn Mae G as. sh owln on the And"krt ptms West M.I), C, jiirmkr ► 411 romWe lews1w specee Irc:Am'g, m aro apt Fhstpd tar, Sooty h versa EVNh Mq whbkym and ay.rgben wxuwny pwpW foci s4ro. hit"o bindwoosg r thistle. ��q dpAt pll be ranawa Ma! � 3,c4WWAor *tail Gear and grub trail alwjwoeA cerrwor 4•Atl guided vegalAtEm HnWI be sl¢afad from Ur sod a'd 6Yposed at In m cppra+aa mane' te4knmg WI appWGa6W kwaW3fo4rfpassral re[jrWllame. 5, Talasasea Caeultants shop dMkgnte aryl pdollilonot plant -p-lat to be rdm&wd duilg rA4-LR- cas4uctkaft e. ran 1, Ireton •Aa7 ,pm cmpletwn of cleok+grg-ArN+g at larctiors dapl&Lpd m mllk]albn ptcw Rene Detail e). :nags "I] txi arahorsd noun etltgada a mhhun ar 25 peecare or Ula t 1 Nlrxalh W depleted h bat pim psWll, Tglp}ppa r aurtmts ehan approve srog locolbrr otter to wmlidiat. P. )gtldlL 1, In all ck*a-ad ad gabbed barter mlugatlon areas, exIAN soll shall be ammtled (or Lope011 vr;wtacU W provYb a q-hch unison depot of Fapw11. 19, bgi;= , Plats haxlat rectwas IQpn cempre Ion of RapsO1F a W sou Rlynemerlaenwlw ILRnn nw wri piaoamenl, m oap,,Led an iota mtltgetian ploy art Mtalt- TPiosPea Carrultmts Nnl! appraw IpGOt ors prpr tp 1. 5mile, W.Ebo Box", Akexh ma rases$ pox to -Ih kstaWd Frog a rnlml t or 15 fact all N. good m DO foot ecel. *Ida d the srta'• In aaa'11m, tM (IO) adaulrxtol ewalrw,t nest IwxM Man W ratawa arc exsllIqr� trpn suer tuffer. krsa a t a aa, agTraxka+sy i ofF Ina rf&Ad an On 5E side of treae. Esau. locatla/ to be aelarmeNd n Us field by Yelwd.a CawALor" 2.pali To "ALk root. down Logt fie- tease Una log at the dews" Wgtn by mpehpnAeaI na1s. Ulm on p the lag at fop scared W4-LLO- LO swm ao Aun bout Look to break TwW ist broken and* to dl,plsa sod c4tc KV(U* foau,r.s that hwe baron WE *Kali haw fro bts4 rod.. 5. rlomy SGapt "I be set ApeLgd. 4.(a-y]Jjyr)sy it awnpaia. baykjpry stplf ps plploa n piles W 4abst 2 rW'1 leap 1`J rack m1t. p.I pib1, In a nlarear Wat prwkwa troth physical .kplwj ad k" ntarml weds. H, ❑�rrrrbakylarEy"3- Ca b-t Overlook 'Alepint at location d.p tted m Sheet WI.2, Per detall 4 an eJget YB.O 1, 1-koll Tree, I. Caleteuot soft-Vlrfa&e troll In wetland WMar oMre *no- on plarm par DSte11 D. 2. ImWIl Danom. per mmmootlrerY spa.LNuAlare. 5, Wall Korpratlw Si par DatdF 2, Sheet w00- •1 rplp.aaa ICk=slmtt Nnll tern pr"ded a mulch Wr;+* Prim w It wog ppthsvd W }lyr *its. fb bAffa arose shall Ise seadeO. GOnwaater Hlall spl-Oah xal&h aver OR OMhrb" molt h0or proof that how been oiscrooky%tbod to acme" a ,swarm daPN of S InPros. K, y�i„u o.w„a-n r� a r�nral stars .arw, I. (retell fprnap a Ntart m Sheet WI,I, par detail I, eFss! WSA. 2. IroWll CrKVai area ■" as shom on 5heet WIJ, per dstall 5, sheet YHA. L. ItepdagmL Prior W platL IrstolkiLdrk Toluene CO IkiTts MOII approW all 6WOWI%f9%bbYlg wpdt and haxat ?"km pl wnwc U huts ara to 1a forrxtfd, a P� ust .tt611 bs prspao,d by Y 7pKIM c~lakm are .Wmtkad w she car4roctor For spmptssim, Alter pyn.1, Iles Mars here wan carpia4i d. tTHanrltp �M Nana stall revnrl the prz;i; ran II- tI cwwpleecs W ender Rout Itemt, and pl�kng mat M. %SrdflllraNen, II thbb 1* a 4OL94 In cp4lry>zlion roe any rea*ar, "rArOCWr "I Ina rn.paaWb for makaercnla Of oraalm 40eWl m.a.aw*, &411`09e, and Ierryarary krkfatlm dnrng *Awbl ctan delay Psrlod. wle" eu arwr.e states In .rdhg GLEARIN6 4 6RU55INO 4 HABITAT FEATURE LEC7ENQ STUMP sel:ols. DOWN L05 SNAS WITH SHALLOW e NEST BOX, SEE DETAIL ws NOTE, IN ADDITION TO A SWALLOW NEST BOX INSTALLED ON PROPOSED SNAG, TEN (10) 5WALLOW NEST BOXES SHALL BE INSTALLED ON EXISTING TREES WITHIN BUFFER ENHANCEMENT AREA5. EXACT TREES AND NEST BOX LOCATIONS TO BE DETERMINED IN THE FIELD BY TALASAEA CONSULTANTS. -x x - SILT FENCE, SEE DETAIL e GRUB ENTIRE AREA BY 18,23q SF HAND OR MACHINE TO REMOVE ALL INVASIVE SPECIES AND REMOVE ANY TRASH AND DEBRI5 SELECTIVELY 5RIS OUT 4,653 5F ALL NON-NATIVE INVA51VE SPECIES BY HAND. PROTECT EXISTINS, NATIVE VEGETATION TO REMAIN. .JOINTS (Al FILTER FABRIC, SMALL BE 9PLIL87 AT POSTE. IJS,C ST,W�5, hCRE Ig1Npg, OR I'AAVALF)rr TO ATrA(k1 PA9IZIL TO POSTS. 2S4' BY 14 E,A. WIRE OR EQUIVALENT. ] FILTER PAMC- II I -11MI IM 4"x4' T SAAGINS MAY "'Et'&H BxHI TH Be It .RaA5W TO D' IF WIRE BACKINS SOIL 15 USED STEEL FENCE POSTTie - RE BAR OR EDUNALIENT NOTE, FILTER PABRIL FENOES SHALL BE INSTALLED ALONE, CONTOUR WEfEVER POSSIBLE. SILT FENCE MAINTENANCE STANDARDS, I. ANT pANAM SMALL Be REPAIRED lr*MIATFLY. 2. IF C4WFNTRA1`W FLOW$ ARE FOOENT WV-OPE OP THE PENCE, THEY MET tXt NG C-0raVET'ED TO A SEDIMENT POND. 5. CAPFiRA4TOR SItALL G7CSK TEE WSL-O.°E SIDE OF TIE FgY a mm Swe OF Cl oom Am suB5eaaw CHMaELIEATIGN OP PLovir PARALLEL TO THE txi 4-E IP THIS OOCulM R[PI.ACE THE FE CE AJmAOR REMOVE THE TRAPPED SEDIMENT. 4, SEDn$]ar 9NN.L BE REMOVED WHEN ACCNNJLATION ENG®S 6" IN DEPTH, 0 1 5LA:.- 1I5 NOMS I. SURVEY PROVIDED BY E51M CON51.11-TIN6 EN61NEER5, 33g15 15T WAY 50VTH 11200, r- RAL HAY, WA CIOW3, (425) 415-5144. 2. SITE PLAN PROVIDED BY GPN C01 11LTANTS, 133 TTH AVENUE, SUITE 100, KIRiKLANV. WA craOM (425) M-2590, 3, SOURCE 09,AWiH65 keERE MODIFIED BY TALASAEA CONSULTANTS FOR V15UAL ENHANCEMENT. 4. THIS PLAN 15 AN ATTACHMENT TO THE FINAL PeTLAIv BUFFER IMPACT AND MITIGATION REPORT PREPARID BY TALASAEA 0014SULTANTS IN JULY 2014. CALL BlpOR[ YOU DIO �-eaws4-sane CiTYOFFEDERAL WAY APPROVED FOR CONSTRUCTION BY: DATE: Orr OF ff00Nl. WAY, O64NTIEM W HA1Nsf10 RN PERMIT Na CL. 1y", e04 - twr•xxx C"nxulAxnlx, Ina, All ft- mexen"d 0 TA LAS LEA CONSULTANTS, INC. Roue.... An d Eavlronmente] Planning z 0 z z 3 Z (L W s a z Z � Y 2 LLJ CC eft Z LLJ z m m '< ��y ��/// 3 Vz r rY 3 DEVCO, INC. ywaxr wf.„n 11100 Main Street Suite 301 BELLEVUE, WA 98004 PHONE: (425)453-9551 g A CP H CONSULTANTS Sh KinMnk - Ohl E4mllry Und UN pmV4• PIW MKAP sot u1MAw,rAee Sa Mx,4 WAtIla Mre;14N1]N19N FAtlailhlaas ... renrammnrm,,rra 'ROJECT NO. A TAL 1422 t JMWINO A I .2 SHEET-1 OF A A97241217 - arch CS17241217 - eng WETLANDS TOPO DL CON0171ONS CBLA241217 CUS0247217 COVS241217 CGRD241217 r ¢ GFNAHAF{R TOP OF POST 45 DEGREES TO A DEPTH OF V ON ALL FOUR SIDES AT MTN 25-YEAR SEALANT 2'Xb'PRE56URE TREATED 4' FIR RAILS. SPACED 1'-6' OC. 4•X4' FRB56UFEE-TFMATED FIR POST WITH HER. TREAT® END (NO SITE CUTS) I RTGRI FI � TGORAD VN ( \ 1 y 1 24' MIN I' I' CONCRETE FOOTING ILL WITH NATIVE SOIL BUTT -JOINT FASTED Nv t31 5' r2d Box HEAD NAILS P05T/RAIL CONNECTION bk T . I mc�r TO ALIGN WITH L G rtx,AD'EtT. ;4 TK'F_AT WITH CLEAR FIRZV2tVl . NZ- UPON GOMPLETION OF INSTALLATION. 5. ALL FASTENERS SHALL BE GALVANIZED STEEL (aO71EN 2-50ARD FENCE DETAIL TIE INTO WOODGHIP TRAIL bKm 1. CONTRACTOR TO D®ISHMU D OVERLOOK ACCORDING TO THE ABOVE 011,11 ONE. SEE SHEET M.I FOR LOCATION OF OVERLOOK, 2. CONTRACTOR SHALL SUSMIT OVEYOOK DESIGN TO TAIASEA (/,t &Lj N A CITT OF FHDHR4. KAY• AND 011' INC. FOR PPNSN NO APPAOVAL PRIOR TO 0O%TAk5TI0H S, OVERLOOK STRUCIU! AND HANDRAIL TO HOT ALL APPLICABLE BUILDING AND SAFETY C42POO 45SU.ATIM OONIRACTOR SHALL St IE ALL NECESSARY PERMITS PRIOR TO CONSTRUCTION. G AETLANO OVERLOOK DETAIL SEC. 29, TWP 21 N, R4E W.M. CRITICAL AREA PROTECTION AREA THIS AREA IS PROTECTED TO PROVIDE. WILDLIFE HABITAT AND TO MAINTAIN CRTITFAT. AREA(S) FUNMONSIVALUES PLEASE DO NOT DIS IVRB TIES VALUABLERE.SDURCE WNTACTCrtYOFFIDGRAL WAY F00. MOnT mFDRMATION 9 PRE-PRINTED LATTER fPZ W tEe SIGN SIZE • BACK ALUND, A SIGN WITH WHITE REFLEGTIVE DARK APH S TF¢YY jq[}j 1�1 IyxC( �1 a (n 8$ I,3{5 IC f$k a Ve$lSN APFPROOF e Lii>r!t TP 8E APT1iOVE) 6'I' I 115E A MI6 NRN14JM OFDTWO 6ALLVAANN� OR 5TAINLES55 s TALASAEA GOICI,LTANin. 14MW AT 45' A„r, >: STEEL LA6 BOLTS TO FIRMLY SECURE SIGN. iL. o zz 4" X 4" PR -55URE TREATED WOODEN POST WITH 19" i S iki• RE TREATED GHAH4FEIR AT TOP ro BE SET PLUI-t0 v POST" TO BE t4Tu STTRREpS SECURED TO PPST NTN THO W D1A QI11GK 5EI CONGRET2 GALA. GVtRAGE T)OLTS. BASE! PµTE To M SET 1' COMPACTED NATIVE MATERIAL ABDVE 001AI RrIE POUTING S71RipUP9 TO BE ANCHOR® T. LEI IN PIOOTI45 A MIMMk1 OP 12' N ET CONSULTANTS INC 006H i7 ELEVATION 6" Ree"urce Ed nvlro meolel PLnnlo� OTES I, CRITICAL AREA 515N5 SHALL BE PLACED NO 6REATER THAN 100 FEET PrMH 5URFACE TO DRAIN APART AROUND THE PERIMETER OF THE CRITICAL AREA PROTECTION n _ CF[•NOri.L WITH NATIVE SOIL AREA, WHERE SHOWN ON PLANS. " I 1 2, 515N PLACEMENT SHALL BE 51,6JECT TO THE APPROVALOF THE CITY + OF FEDERAL WAY. H2• HaR 5. ALL 515N5 MUST BE SECURE AND PERMANENT. SECTION INTERPRETIVE 516N DETAIL CRITICAL AREA 51L5N DETAIL z Z N.T.S. HITS. � 4z �A. z - z 0 9HNLOw ROT BOX 1 I, e�,MAG SHALL HAVE A MINIMUM OF EIGHT w BRAWAiES EVENLY 12151RIUJTWcc 2. MM BURBNA&I L DEPTH OF 25% OF Z�/ TOTAL Lu T. S. SNAG TO BE INSTALLED AS HEAR TO VERTICAL A9 POSSIBLE AROUND SNAG BASE SHALL ZM I 4. BAC47ILL Be COMPACTEV TO A MIN. OF 90% OF m r THE 01 qe MAX, DRY DENSITY PER L) Q 3 S S. DI ATTACH ONE SWALLOW MOST BOX TO ' CEDAR OR FIR SNAG, EACH SNAG APPROXIMATELY 15 FEET 24' MR HDTV AT ABOVE GROUND WITH OPENING FACING (2'J DEPTH OF EX. WOOD CHIPS GRADE s+ eN[iw aLeVE1 Y S. SUT SPECIPIGATION9 FOR SUPPLIBi9 OF J SWALLOW NEST Boxes. l I� Q LU O 2asSLOPE Y 3 0 s4,n .T..4.,..�99cy n"P^&c V"m �oA^vp r �n�' 8av'$ay.�i eyn��ao+agar#>�.oa fa a r i GRADE DUEN GOMPACrEVI rrILL'SEE 1J NOTES ABOVE EVCO, INC. D __• ywlnY ca,nta I, TRAIL LOCATION SHOM ON PLAN 15 APPROXIMATE. TALASAEA GONSUI IS a f �' 11100 MSIn Stf I, Sure 301 SHALL FIELD LOCATE AND APPROVE FINAL TRAIL AL SHMEN' IN THE UNDISTURBED BUFFER AREAS PRIOR TO TRAIL CONSTRUCTION. TRAIL SHALL BE ',� BELLEWE, WA 9B004 PHONE: (425)453.9551 ROUTED TO MINIMIZE DISTURBANCE TO EXISTING NATIVE VEGETATION AND {I _ g ROOTS OF EXISTING TREES. I y 2. FINAL TRAIL ALIGNMENT SHALL AVOID ALL EXISTING SIGNIFICANT TREES AND AREAS OF 51GNIPICANI NATIVE VEGETATION. 3. CLEARING/GRUBBING OF EXISTING VEGETATION SHALL BE THE MINIMUM NATIVE �J,BBRFDE 12' NECESSARY TO CONSTRUCT TRAIL. TREE ROOTS SHALL NOT BE GUT AND DIST1URSANGE TO ROOTS OF EXISTING TREES AID NATIVE VEGETATION WITHIN BUFFER AREAS SHALL BE MINIMIZED TO THE GREATEST EXTENT PRACTICABLE, 1 V4' CRUSHW ROCK CP�H A00C) CHIP TRAIL DETAIL SNAs5 WITH NEST DOX ❑ TAI r.�ounio� CONSULTANTS N*5G) 7�00444'BOB. SW P004-CM B1/m" UG UN waof' P" MxRllom K m Tn An,w, ne Im I aura ve RRw nwl^A NAM:1NmlTWTm NOTES_ 09r6T110 ono n,munu,,en CITY OFFEDERAL WAY I. SURVEY PROVIDED BY ESM CONSULTING ENGINEERS, 35915 1ST APPROVED FOR CONSMUMON PROJECT NO. WAY SOUTH 1200. FEDERAL WAY, WA 9ec03, (A2W 415-5144. 2. SITE PLAN PROVIDED BY GPH GON5ULTANM 753 "ITT AVENUE, SUITE 4 TAL 1422 W IOU, KRKLAND, Koi 98033, M25Y 20.23R0, 5, SGSRGE DRAYtINSS WERE MODIFIED BY TALASAEA CONSULTANTS Byl DATE DRAWING Iwl FOR VISUAL ENHANCEMENT, Im 1K FOOK MIe, DlANniCIT OF RAW I 4. THIS PLAN 15 AN ATTACHMENT TO THE FINAL WETLAND BLUFFER RIWPERNTNO. I SHEET �OF S IMPACT AND MITIGATION REPORT PREPARED BY TAL.ASAEA CONSULTANTS IN JULY 2014, r..=e,.M•., eAH - hlana C"nrelMnN, IRv. All IRexM N,•,mE. ASIT241217 - arch CS17241217 - eng WETLANDS TDPO EX. CONDrnONS CBLA241217 CUSD241217 CUWS241217 CGRD241217 -- I S C. 29, TVUP R4E\W.M: ADD 2 - .. .-.. .I. .. ,3-4 MAN {IIj I!j 1 ROCKS f ■ � j FIB • p O ■ ■ ■ + r ■ J I ° D + � + LJ p •> • 17 O ,� +•�• ■ 1 {� $' U}r �% x u 2-BOARD FEWVJ ISPEFZS404 TRENCH k TIE IN TO CIVIL-) 51LT FENCE I I X T-10' WIDTH STORMWATER SCALE WITH 3,1 SLOPE, REMOVE EXCESS ROCK — i I \ / u SOFT SURFACE TR/ WETLAND I \ I 013,520 SF ON WTE �\ CATE60RY 11 \ PLANTINcS AREA A PLAN LE(SEND � 6RAPHIG SCALE NORTH — — — PROJECT SITE BOUNDARY ( IN PESTS QQ — C` —ETLEXISTING WETLAND HETL 1//IIIV�1 :� [�J Y�AND BUFFER/SECURITY FENCE O 20 40 �+-' •� EXISTING STREAM CENTERLINE SCALE, I"=20' EXISTING FORE5T/x?ZU3.5}:Rl,'B VEGETATION M.ANT LIST LAR6E TREES MASSING SHRUBS KEY SCIENTIF€C NAME COMMON NAME KEY 5CIENTIFIG NAME COMMON NAME R MAGROPHYLLUM DIG -LEAF MAPLE O CORNU5 ALBA DOGWOOD Q MAHONIA AGUIFOLIUM T�� GON O BETULA PAPYRIFERA PAPER BIRCH O R05A 6YMNOGARPA BALDHIP ROSE + GORNUS NUTTALLII PACIFIC, DOGWOOD ROSA NUTKANA NOOTKA ROSE +PSEUDOT5USA MENZIESII DOUGLA5 FIR ® PSEUDOTSU8A MENZIE511 DOUSLA5 FIR OO RUBUS PARVIFLORUS THIMBLEBERRY [ Q ] FRANSULA Pl1R5HIANA CASCARA ® RAm SPEGTABILIS SALMONBERRY 0 THUJA PLIGATA WESTERN RED CEDAR (D SYMPHORICARPU5 ALBUS COMMON SNOWBERRY THUJA PLIGATA WESTERN RED CEDAR TSL'GA HETEROPHYLLA WESTERN HEMLOCK 6ROUNDCOVERS* KEY SCIENTIFIC NAME COMMON NAME �Cl]' TSU&A HETEROPHYLLA WESTERN HEMLOCK ef"a GAULTHERIA SHALLON SALAL SMALL 7REE5/LAR6E SHRUBS s eon POLYSTIGHUM MUNITUM SHORD FERN KEY 5CIEHTIFIC NAt•Ir CdJ^`r--G4 Nr r •61ROUNDCOVER SYMBOLS ARE NOT SHOWN ON PLANS. {. AGER GIRGINATUM VINE MAPLE GROUNPOOVER SPECIES SHALL BE LOCATED IN BETWEEN TREE AND SHRUB GROUPINGS WITHIN BUFFER MITIGATION AREAS A t B. IN AREAS LESS THAN 3' WIDE AT THE TOE OF O AMELANGHIER ALNIFOLIA SERVICEBERRY ANY RETAINING WALLS AT BUFFER PERIMETERS (E.G. BUFFER ORESTORATION AREAS DISTURBED BY SITE GRADING OR CRATAEGUS DOU6LAS11 BLACK HAWTHORN WALL CONSTRUCTION, SEE BUFFER INTRUSION AREAS ® DEPICTED ON SHEET 1,4I.1), OR06MXOVERS SHALL BE FIELD HOLODISGIS 015WLOR OCEAN SPRAY LOCATED BY TALASAEA CONSULTANTS. ® OEMLERIA CERASIFORM15 INDIAN PLUM RHODODENDRON PACIFIC, MACROPHYLLUM RHODODENDRON ro SAMBUGUS RAGEM05A RED ELDERBERRY 0 50RBUS 51TGHEN515 SITKA MOUNTAIN ASH ss Q f`Tl rY.li No= ( I ss — ss —� ss Fly i 6RADINS LIMIT FOR CIVIL SITE WORK + u \ + � u I � � I � U I � � m 0 100' BUFFER — MATCH LINE TO PLANTING AREA B m m NOTES 1. SURVEY PROVIDED BY ESM CONSULTING ENGINEERS, 33915 1ST WAY SOUTH 0200, FEDERAL WAY, WA 96003, (425) 415-5144. 2. SITE PLAN PROVIDED BY CPH CONSULTANTS, 753 lTH AVENUE, SUITE 1004 KMLAND, WA 48033. (425) 265.2390. 3, E DRANINDS WERE MODIFIED BY TALASAEA CONSULTANTS FOR VISUAL ENHANCEMENT, 4, THIS PLAN 15 AN ATTACHMENT TO THE FINAL WETLAND BUFFER IMPACT AND MITIGATION REPORT PREPARED BY TALASAEA CONSULTANTS IN J)LY 2014. a I I CALL DlPORL YOU DIO � 1 •EOO.4Z44SOO6 z 0 9 TA LAS LEA CONSULTANTS, INC. Resource e d Envlrenmanlel Plannlop 0 3 z � g $ a z z 0 w Z Lu cr O ZD m g OL VJ z Z 3 C DEVCO, INC. yual,ly,ounl, 1110C Mein Street, Sulle 301 BELLEVUE, WA 98004 PHONE: (425)453.9551 CYH CONSULTANTS Sea Pw" • the Fn®n■AM um uwo'—r4 - R*d MlnwmeN 131 rt,Pwma&o l00I N'MN. WPMBO➢] rPo'.IgW]6�1801 fpclallPAvl■ ..,r <PAPemuIIPPIP Pen CITY OF FEDERAL WAY APPROVEDFOR CONSTRUMON PROJECT NO, TAL 1422 BY., DATE - tm a FMONI MMY, OOINil07t GF AAWK DRAWING W2 ,O R/W'PERMITNO, 6C.,1WM 014 - hl.vva l'onrullnnl•. I— All NRN4 Nv.er•eE. SHEEF 6 OF—Q- ASIT241217 - arch CS17241217 - eng RETLANDS TOPO EX. COND17IONS CBLA241217 CUS0241217 CUWS241217 CGRD241217 MATGHLINE TO PLANTING AREA A :won 'mmmmm KEETLAND I 'I 45420 5F ON 5 T0r.. TEGORY 11 SOFT SURFACE TRAIL 1 a `l ° / -4 * � J \ J rl'•, V 2-BOARD FE17LE� � `` II ti• l / t GRADINGINS LIMIT FOR CIVIL SITE HORK PLANTINIS )AREA S GRAPHIC SCALE Oo ( IN FEET ) O 10 20 40 VL/ SCALE, 1"•20' SEC. 29, TWP 21 N, R4E WA PL4NTIN6 AREA G ORAPHIG SCALE NOSTH ( IN FEET 0 I0 4a SGALEi I"•20' PLAN LWEND PROJECT SITE BOUNDARY CEXISTING WETLAND �+ ••-+ •— WETLAND BUFFER/SECURITY FENCE —••�•••— EXISTING STREAM CENTERLINE l EXISTING FOREST t 5GRU3-SHRU9 VEGETATION -- INS 1 6RADIN6 LIMIT FOR `•� CIVIL SITE WORK PLANTI N6 AREA D GRAPHIC SCALE NOISTH ( IN FEET) n 2;Cl� SCALE.1•-20' PLANT LIST • v J KE-1 L ,SNP.-2 1106,R12 5P\ON 5ITE GATEWR\Yj,I I LARGE TREES SMALL TREES/LARISE SHRUBS MASSING SHRUBS KEY SCIENTIFIC NAME KEY SCIENTIFIC NAME KEY SCIENTIFIC NAME • AGER MAGROPHYLLUM GIRGINATUM O GORNUS ALBA �AGER Q MAHONIA AOUIFOLIUM I BETULA PAPYRIFERA AMELANGHIER ALNIFOLIA Q RGSA 6YMNOGARPA • CORNJS NUTTALLII O GRATAEGUS DOU&LASII ROSA NUTKANA P5BUDOT5U&A MENZIESII HOL00I5CV5 D151-OLOR MENZIE511 RUBUS PARVIFLORU5 1+ PSEUDOTSUSA OEMLERIA GERASIFORMI5 ® RU5U5 5PEGTABILIS JFRANSULA PVR5HIANA O RHODODENDRON MAGROPHYLLl1M (D 5YMPHORIGARPUS ALBU5 s!j } THUJA PLIGATA THUJA PLIGATA OO 5AMBUGU5 RAGEMoSA 6RDUNDGOVERS* 5ORBU5 SITGHEN515 � KEY SCIENTIFIC NAME TSt16A HETEROPHYLLA �n�oL 6AULTHERIA 5HALLON T5U9A HETEROPHYLLA m,HOmL POLY5TIGHUM MUNITUM •6ROUNDGOVER SYMBOLS ARE NOT SHOWN ON PLANS. 6ROUNDGOVER SPECIES SHALL BE LOCATED IN BETNEEN TREE AND SHRUB GROUPINGS WITHIN BUFFER MITIGATION AREAS A 4 B. IN AREAS LESS THAN W WIDE AT THE TOE OF ANY RETAINING WALLS AT BUFFER PERIMETERS (E.6. BUFFER RE5TORATION AREAS DISTURBED BY 5ITE 6RADIN6 OR WALL CONSTRUCTION, SEE BUFFER INTRUSION AREAS DEPICTED ON SHEET 1,11,10, 6ROUNDGOVERS SHALL BE FIELD LOCATED BY TALA5AEA CONSULTANTS. NOTES I. SURVEY PROVIDED BY ESM GONSULTIN6 ENSINEER5, 5NIS I5T HAY 501JTH 0200, FEDERAL WAY, HA laO03, (425) 415-5144, 2. SITE -LAN F'R,OVIDEO BY GPH CONSULTANTS, 133 TIN AVENUE, SUITE 100, KIRKLAND, HA 98033, (425) 285-23R0. 5. SOURCE DRAWINGS HERE MODIFIED BY TAIASAEA CONSULTANTS FOR VISUAL ENHANCEMENT. 4. THIS PLAN 15 AN ATTACHMENT TO THE FINAL VgTLAND BUFFER IMPACT AND MITIGATION REPORT PREPARED BY TALASAEA CONSULTANTS IN JULY 2014. FCC CALL BEFORE YOU DIO THESE FLANS HAVE aim WW17TW TO THE APPROPRIATE A SHIES FOR REVIEW AND APPROVAL. UNTIL APPROVED. THESE PLANE ARE, 5UB.lEGT TO REVISION ®Vap,ALNI Bull - i,h•,,, cv.,ulAw4, Inv. All @.M• N„m.".. G TALAS LEA CONSULTANTS, INC. f.—. a envlr.nmental PI•nnl„` ulw w a~...•..m .mn 0 x 3 g � Z Y O C¢'.7 W Z w O U ca ♦��/1•� p a vI Z Z Y 3 a CLIENT DEVCO, INC. q .,I1,Y-11L, 11100 Maln Street, Suite 301 BELLEVUE, WA 98004 PHONE: (425)453-9551 4 UB CONSULTANTS SA.Pgnni •ONWOr.enr4 wN we c—wq • No /14n0(.n1.111 N1 iNAmw, PI.IW A+W6WA.IYRf Rav:11x111Nsro fASNX111.].1. oeoo A[,n,ull,nb.w. PROJECT NO. TAL 1422 DRAWING 9HEET_T OF 8 ASIT241217 - arch CSIT241217 - Lng NE7LANDS TOPO IX. CONDITIONS CBLA241217 CUSD241217 CUWS241217 CGRO241217 PLANT SCHEDULE TREES W MACROPHYLLUM BIG, LEAF MAPLE FACU ti BETULA PAPYRIFERA PAPER BIRCH FAG • GORN.15 NUTTALLII PACIFIC 006W000 FACU CA FRANSULA (RHAMNUS) GASGARA FAG R/RSHIANA P'5EUDOTSU6A MENZIE511 DOLd74SLAS FIR FACU �''+� fi + P5B0T5U&A MENZIE511 DOUSLA5 FIR FACU (D7 O THUJA PLIGATA WESTERN RED CEDAR FAG (j '' THUJA PLIGATA WESTERN RED CEDAR FAG T5U6A HETEROPHYLLA WESTERN HEMLOCK FACU j�JJ`,� .{ t—D) 17 TSUSA HETEROPHYLLA WESTERN HEMLOCK FACU SMALL TREES B LARGE SHRUBS WL .' AGER GIRGINATUM VINE MAPLE FACU- O{L'iJ y AMELANGHIER ALNIFOLIA SERVICEBERRY FACU O CRATAESU5 DOUSLA511 BLACK HAWTHORN FAG G HOLODISGUS DISCOLOR OCEAN SPRAY FACU p OEMLERIA INDIAN PLUM FACU VJ GERASIFORMIS RHODODENDRON PACIFIC NL MAGROPHYLLUM RHODODENDRON SAMBUC45 RAGEMOSA RID ELDERBERRY FACU ( • } SOR5US SITCHENSIS SITKA MOUNTAIN ASH NL SIZE AS SHOWN 6 5-61 Hi. SSIN6LE TR TRUNK, WELL BRANCH AS SHOWN 24 5-6' HT. 51BNGTRUNK , WELL AS 5HOWN 12 SSIN TRUNK, WELL 4-5' HT. SIF AS SHOWN 4 4-5' HT. SIBS K, WELL NCHEV AS SHOWN 3 2-3' HT. 2 6AL., FULL 4 BU5HY AS SHOWN 28 4-5' HT. BOB, FULL 4 BUSHY AS SHOWN 16 4-5' HT. 54 B, FULL O BUSHY A5 SHOWN 10 2-3' HT. 2 6AL., FULL 4 BUSHY AS SHOWN 5 4-5' HT. BOB, FULL O BUSHY A5 SHOWN 13 2-3' HT. 2 6AL., FULL 4 BUSHY 51ZE A5 SHOWN 24 4' HT. MULTI -STEM C3 MINJ 5' O.G. 6 24" HT. MULTILANE (5 MINJ 5' O.G. IT 24" HT. MULTI -CANE 0 MINJ 5' O.G. 56 24" HT. MULTI -CANE (5 MINJ 5' O.G. '19 24" HT. MULTILANE C3 MINJ 5' O.G. 31 24" HT. RILL 4 BUSHY 5' O.G. 377 24" HT. MULTI -CANE (5 MINJ AS SHOWN 12 5-6' HT. SBRANGFTRUNK, WELL MA551N& 5HRU55 SYMBOL W FI COMMON 5TATU6 5PAGING CITY. (MINJ NOTE5 0 (5ERIGEA) RED -OSIER P0�#OD FAGW 4' Q.G. 14 10" HT. MULTI-r ANE C3 MINJ Q MAHONIA AGIUIFOLIUM TALL ORE60N GRAPE FACU 4' O.G. 83 16" HT, FULL 4 BUSHY Q ROSA 6YMNOGARPA BALDHIP R05E FACU 4' O.G. 60 16" HT. MULTILANE 0 MINJ ® ROSA NUTKANA NOOTKA ROSE FAG 3' O.G. 20 16" HT. MULTILANE (5 MINJ Q RUBUS PARVIFLORUS TH143LEBEFZRY FACU 4' O.G. Q5 18" HT. MULTILANE (3 MINJ ® RUBUS SPEGTABILIS SALMONBERRY FAG W O.G. 14 16' HT. MULTILANE (3 MINJ &ROUNDOOVER50 RILL SIZE SYMBOL.SCIENTIFIr, NAME COMMON NAME STATUS SPACING QTY. MINJ NOTES MD 6AULTHERIA SHALLON tn� SALAL FACU 24' O.G. 621 1 GAL. RILL 4 BUSHY sr aa� POLYSTIGFUM MUNITUM SWORD FERN FAGU 96" O.G. 214 1 GAL. RILL O BUSHY •GROUNDC.OVER SYM501-5 ARE NOT SHOWN ON PLANS, GROUNDGOVER SPECIES SHALL BE LOCATED IN BETWEEN TREE AND SHRUB &ROUPINSS WITHIN BUFFER MITIGATION AREAS A 4 B. IN AREAS LESS THAN 5' WDE AT THE TOE OF ANY RETAINING WALLS AT BUFFER PERIMETERS (E.G. BUFFER RESTORATION AREAS DISTURBED BY SITE SRADING OR WALL CONSTRUCTION, SEE BUFFER INTRUE710H AREAS DEPICTED ON SHEET WI.U, 6ROUNDGOVERS SHALL BE FIELD LOCATED BY TALASAEA CONSULTANTS. cSENERAL PLANT INSTALLATION NOTES I. PLANT TREES AND/OR 5HRUB5 V HIGHER THAN DEPTH GROWN AT NURSERY. 2. FOR CONTAINER TREES AND/OR SHRU55, 5GORE FOUR 510M OF ROOTBALL PRIOR TO PLANTING. BUTTERFLY ROOTBALL IF ROOT GARGLING 15 EVIDENT. 5. STAKE DECIDUOUS AND EVERGREEN TREES 4 FEET AND OVER IN HEIGHT WITH ONE 0) STAKE PER TREE. STAKE TREES IMMEDIATELY AFTER PLANTING. PLACE STAKE AT THE OUTER EDGE OF THE ROOTS OR ROOTBALL, IN LINE WITH THE PREVAILING, WIND. STAKES SHALL BE LOOSELY ATTACHED USINS CHAIN -LOOK TREE TIES TO ALLOW FOR SOME TRUNK MOVEMENT. STAKES TO BE VERTICAL, PARALLEL, EVEN -TOPPED, UNSCARRED AND DRIVEN INTO UNDISTURBED SUBSRADE. REMOVE AFTER ONE YEAR 4. WATER PLANTS IMMEDIATELY UPON PLANTING, THEN PROVIDE MANUAL WATERING OR A TEMPORARY IRRIGATION SYSTEM TO PREVENT PLANT MORTALITY AND ENSURE PROPER PLANT ESTABLISHMENT. PLANTS SHALL RECEIVE A MINIMUM OF APPROXIMATELY ONE INCH OF WATER EVERY WEEK DURING THE DRY SEA50N (6ENERALLY JUNE 15TH - OGTOBER 15TH, OR EARLIER OR LATER IF CONDITIONS WARRANT) FOR THE FIRST SEA50N AFTER PLANTING. IRRIGATION AMOUNTS MAY NEED TO BE INCREASED DURINS PROLONSED PERIODS OF HOT, DRY WEATHER, 5. FERTILIZE ALL TREES AND SHRU55 WITH A SLOW -RELEASE GENERAL PURPOSE GRANULAR FERTILIZER OR SLOW -RELEASE TABLETS AT MANUFACTURERS SPECIFIED RATE. SEC. 29, TWP 21 N, R4E W.M. SET TREE STRA16W AIL) RAGE ROOTBALL ON SOLID GROUND OR ON COMPACTED BAGKFIL.L. BA00mi" PLAJ%7IK9 Ho{z V2 FULL WTI NATIVE SOIL AND TAMP 504L TO STABILIZE ROOTBALL. OUT AWAY WIRE, STRING, AND BURLAP AND BAGKFIL.L REMAINING RANTING HOLE. AMEND BACKFILL AS NOTED IN THE PLANTING SPEGFIGATION5 AND/OR INSTALLATION NOTES, 2 TIMES ROOTBALL VIA, I STAKE PER TREE LOCATED OUTSIDE OF ROOTBALL FA57EN w GHAIN.OGK TES. LOOP EACH TIE AROUND TREE LOOSELY TO PROVIDE I' SLACK FOR TRUNK GROWTH. STAKE 1-06HT MUST BE AT LEAST 4' ABOVE FINISFED htLGH TREB yaTH Fu.G+r Tq"9 0 9' DEBP x ",Y DIa TO K-TMN 9" T OF THE TRUNK - DO NOT MOUND 1•L+LGN AGA4i5T TRUNK a FORM TIEMPORARY 5' H16H SOIL DAM AROUND TREE TO p NOLq WATPR Z FINIS EV GRADE p. EXCAVATE "7Lt 2 T"IS Niom TWw ROOTENLL SGARPPr 9zCS OF PLANTING HOLE. MINCE GORE HOLE - �- HAS GOOD DRAINAGE. I 545 TREE PLANT I NS DETA 16, Reeou ce d Envlronmenlel Plenning SET PLANT STRAIGHT AND PLACE Z ROOTBALL ON SOLID SRUMD OR o ON COMPACTED BAG417ILL BACKFIPLANTING HOLE x �y r • FULL WIMP TH NAIVE 901L, TA50IL1E TO z 3 a S• � s STABILIZE ROOTBALL, DO NOT DISTURB ROOTBALL, BAGQ-II.L M1LGN a, - lPO HM V {t REMAINING RANTING HOLE 1 AMEND PILE MULGH AW M%T ~ STEM BA4I7ILL PER SPECIFICATIONSp a 8 4` . ` AIAADR RANT INSTALLATION NOTES z p Z PINI5 S GRADE c) w Y SCARIFY SIDES OF RANTING 0 HOLE, MAKE SU/E HOLE HAS Q Z fI'=1.-:si;; .��-:I.--!=-l;••::= =--[=il:-\ ti.' ''��h�T -L—•:�- GOOD DRAINAGE Ei05TIhOWIVE SOIL J ;'-.=11=i.�=jFFIP" F- ?WES w CC 2 ROOTBALL DIAMETER z W LL, p J CONTAINER STOCK P ANTIN(5 DETAIL O m0 W 3 Y NOTES I, SURVEY PROVIDED BY ESM CONSULTING ENGINEERS, 53915 1ST WAY SOUTH 0200, FEDERAL WAY, WA 98003, (425) 415-5144. 2. SITE PLAN PROVIDED BY GPH CONSULTANTS,1W TTH AVENUE, SUITE 100, KIRKLAND, WA 98033, (425) 285-2590. 5. SOURCE DRAWINGS WERE MODIFIED BY TALASAEA CONSULTANTS FOR VISUAL ENHANCEMENT, 4. THIS PLAN 15 AN ATTACHMENT TO THE FINAL WETLAND BUFFER IMPACT AND MITISATION REPORT PREPARED BY TALASAEA CONSULTANTS IN JULY 2014. — — DEVCO, NC. '..InauMa 11100 Meln SUemt, Sutte 301 BELLEVUE, WA 98004 PHONE: (425)453-9551 g CALLBl FOR! rou ola 7�OG494!!!! UP CONSULTANTS Sim N W 4' Va DomL u1HumTA1NNA4, R"ft*wW MYOFMDERAL WAY m.n,a"nn"m"unnu,wn APPROVEDFOR CONSTRUMON PRarecrNo• TAL 1422 a BY: DATT• aTr of TEVERg. ■Ir, oowTBnlr of nANxxo oRnwlNa W3 O RIWPBRNlTNO. SHEET—LOF 8 c v p "ienl "14 - Tnl"nu Gnnn" w'u. Ina. All mlphl. e......, ASIT241217 - arch CS17241217 - eng N£(LANDS TOPO EX. CONDITIONS CBLA241217 CUSD241217 CUNS241217 CGRO241217 PLANTINGS SPECIFICATIONS PART I, GENERAL 1.1 SUBMITTALS A. PRODUCT DATA, FURNISH THE FOLLOWING WITH EACH PLANT MATERIAL DELIVERY I. INVOICES INDICATIMI6 51ZE5 AMID VARIETY OF PLANT MATERIAL 2. CERTIFICATES OF IN5PECTON REQUIRED BY STATE AND FEDERAL AGENCIES. B. m ALITY rgmH c& jjgj!GrrA1.5. I. PRIOR TO DELIVERY OF MATERIALS, CERTIFICATES OF COMPLIANCE ATTESTING, THAT MATERIALS MEET THE SPECIFIED REGUIRBMENTS SHALL BE FURNISHED FOR THE FOLLOWING, PLANTS, TOPSOIL, FERTILIZER AND ORGANIC MULCH. CERTIFIED COPIES OF THE MATERIAL CERTIFICATES SHALL INCLUDE THE FOLLOWING, a.PLANT MATERIALS, BOTANICAL NAME, COMMON NAME, SIZE, CIANTITY BY SPECIES, AND LOCATION WERE GROWL b.IMPORTED TOPSAIL, PARTICLE SIZE, PH, ORGANIC MATTER CONTENT, TEXTURAL CLASS, SOLUBLE SALTS, CHEMICAL AND MECHANICAL ANALYSE5. G.FERTILIZER, CHEMICAL ANALYSIS AND PERCENT GOMP051TION- d.IMPORTED WLGH, 6OMP051TON AND SOURCE. 1.2 REFERENCES A. SHALL CONFORM TO THE CURRENT EDITION OF THE AMERICAN STANDARD FOR NURSERY STOCK, F1BL15FW BY THE AMERICAN NURSERY AND LANDSCAPE ASSOCIATION. 1.4 GUALITY ASSURANCE A. WOPXER'S GUAUFIC M01i , THE PERSONS PERFORMING THE PLANTING AND THEIR SU'BRV15MISI SHALL BE PERSONALLY EXPERIENCED WITH PLANTIN5 AND CARING, FOR PLANT MATERIAL, AND SHALL HAVE BEEN REGULARLY EMPLOYED BY A COMPANY ENGAGED IN PANTING AND CARING FOR PLANT MATERIAL FOR A MINIMUM OF 2 YEARS. B. PLANT MATERIAL, ALL PLANT MATERIALS SHALL BE LOCALLY GROWN OR REGIONALLY ACCLIMATIZED TO THE PACIFIC NORTHWEST, 15 DELIVERY, INSPECTOR STORAGE AND HANDLING, A. A DLLNB4Y gCiELSIE SHALL BE PRZMDFD AT LEAST 10 CA9GAR DAYS PRIOR iq 1}E FIRST DAY OF DELIVERY. PLANT MATERIALS SHALL BE DELIVERED TO THE JOB SITE NOT MORE THAN T WORKING DAYS PRIOR TO THEIR RESPECTIVE PLANTING DATES. B. PROTEGnQb V,*_2M REL4M,, PLANT MATERIAL SHALL BE PROTECTED DURING LIVERY TO PREVENT DESICCATION AND DAMAGE TO THE BRANCHES, TRUNK, ROOT SYSTEM, OR EARTH BALL. BRANCHES SHALL BE PROTECTED BY TYINSIN EXPOSED BRANCHES 5HALL BE COVERED DURING TRANSPORT. C. FERTILIZER, FERTILIZER SHALL BE DELIVERED IN MANUFACTURERS STANDARD SIZED BAGS SHOWING WEIGHT, ANALYSIS, AND MANUFACTURERS NAME. STORE UNDER A WATERPROOF COVER OR IN A DRY PLACE A5 DESIGNATED BY THE OHNE R5 REPRESENTATIVE. D. INSPECTION, ALL PLANT MATERIALS SHALL BE INSPECTED UPON ARRIVAL AT THE JOB SITE BY THE OWNERS REPRESSNTAT VE FOR CONFORMITY TO TYPE AND GIUANTITY WITH REGARD TO THEIR RESPECTIVE SPECIFICATIONS. E. MULCH, A MULCH SAMPLE SHALL BE INSPECTED BY TALASAEA CONSULTANTS PRIOR TO THE MLCH BEING DELIVERED TO THE SITE. F. STORAGE, I. PLANT MATERIAL NOT INSTALLED ON THE DAY OF ARRIVAL AT THE SITE SHALL BE STORED AND PROTECTED IN DE51OMTED AREAS, PLANTS STORED ON THE PROX,CT SITE SHALL BE PROTECTED FROM EXTREME WEATHER CONDITIONS BY INSULATING THE ROOTS, ROOT BALLS OR 00HTAIN✓ER5 WITH SAWDUST, SOIL, COMPOST, BARK OR WOODCHIPS. PLANT MATERIAL SHALL BE PROTECTED FROM DIRECT EXPOSURE TO MIND AND SUN. BARE -ROOT PANT MATERIAL SHALL BE HEED -IN. CUTTINGS AND BMERSE NT PLANTS MUST BE PROTECTED FROM DRYING AT ALL TIMES ARID SHALL BE FHEELEO-IN WITH MOIST SOIL OR OTHER INSULATING MATERIAL. ALL PANT MATERIAL STORED ON -SITE SHALL BE WATERED DAILY UNTIL INSTALLED. 2. STORAGE OF OTHER MATERIALS SHALL BE IN DESIGNATED AREAS. Ib 5CEDIULIN6 A. PLANTING SEASON, INSTALL WOODY PANTS BETWEEN OCTOBER I AMID FEBRUARY 15 WHENEVER THE TEMPERATURE 15 ABOVE 52 DEGREES F AND THE SOIL 15 IN A WORKABLE CONDITION, UNLESS OTHERWISE APPROVED IN WRITING. CUTTIN55 SHALL ONLY BE USED IF PANTING OCD1R5 BETWEEN DEC56M IST AND APRIL IST. B. PLANT Ilb'TALLATION, EXCEPT FOR CONTAIN`-R- SRONN PLANT MATERIAL, THE I,A MUM TIME WBT THE DIGGING AND INSTALLATION OF PLANT MA71ER AL SHALL BE 21 DAYS. THE MAXIMUM TIME BETWEEN PANT INSTALLATION AND MULCH PLACEMENT SHALL BE 12 HOURS. I. -I WARRANTY A. 69E&= PERIQQD, THE C .'MRRAGTOR-PWAVISD FMSLAN{•Y SHALL EXTEND FOR A PFWCO OF ONE YEAR FROM THE DATE OF M1NY91CAL COMtrYLETION. PHYSICAL COMPLETION FOR THE WORK OF THI5 SECTION IS 11E DATE WHEN ALL CLEARIN5/61R BBIN6, RANTING, IRRIGATION, AND RELATED WORK HAS BEEN COMPLETED AND 15 AC XF,w BY THE OWNERS REPRESENTATIVE, TALASAEA CONSULTANTS, AID APPLICABLE AGENCIES. B. WARRIrHT`Y TERM CONTRACrOR5 WWJWtrY �IMLALL IHY,4LV-D REPLACE EN U- PLANT5 G1,E TO MORTALITY (SANE SIZE AND SPECES 5MLGYN ON THE DRAANM'f.SU. PANTS REPLACED UNDER 71415 WARRANTY SHALL BE WARRANTED FOR AN ADDITIONAL YEAR AFTER REPLACEMENT. 0. EXCEPTQN S, LOSS DUE TO EXCESSIVELY SEVERE GLIMATOLOSICAL CONDITIONS (SUBSTANTIATED BY 10-YEAR RECORDED WEATHER CHARTS), OR CASES OF MESLEGT BY Oil OR GASES OF ABIISEMAMA6E BY OTHERS. PART 2, PRODUCTS AND MATERIALS 2.1 PLANTS A. WEEALL ALL RANT MATERIAL ALL CONFORM TO THE VARIETIES SPECIFIED OR SHOWN IN THE PLANT LIST(5) INDICATED ON THE MITIGATION PANS ARID BE TRUE TO BOTANICAL NAME AS LISTED INN HITCHCOCK, CL, AND A CRONGUIST, IM. FLORA OF THE PACIFIC NORTHWEST. UNNIER511 Y OF WA•HINIBTON PRESS. B. 5FIQ1B3 ANO TR�ErK I. TALASAEA SHALL EXAMINE PLANT MATERIAL PRIOR TO PANTING. ANY MATERIAL NOT MEETING THE REQUIRED 5PECFICATIONS SHALL BE IMMEDIATELY REMOVED FROM THE 51TE AND REPLACED NTH LIKE MATERIAL THAT MEETS THE REQUIRED STANDARDS. PLANT MATERIAL SHALL MEET THE REQUIREMENTS OF STATE AND FEDERAL LAWS WITH RESPECT TO PLANT 015EASE AND INFESTATIONS. INSPECTION CERTIFICATES, REQUIRED BY LAW, SHALL ACCOMPANY EACH AND EVERY SHIPMENT AND SHALL BE SUBMITTED TO TALASAEA UPON CONTRACTORS RECEIPT OF PLANT MATERIAL. 2. PLANT MATERIALS SHALL BE LOCALLY GROWN (EST15RN WAWINSTOR WESTERN OREGON, OR WESTERN BCD, HEALTHY, BUSHY, IN VIGOROUS GROWING CONDITION, MID GUARANTEED TO BE TRUE TO SIZE, NAPE, AND VARIETY. IF REPLACEMENT OF PLANT MATERIAL 15 NECESSARY WE TO CONSTRUCTION DAMAGE OR PANT FAILURE WITHIN ONE YEAR OF INSTALLATION, THE SIZES, SPECIES, AND QUANTTIS SHALL BE EfDUAL TO SPECIFIED PANTS, A5 INDIGATED ON THE PLANS, 3. PLANTS SHALL BE NURSERY GROAN, HELL -ROOTED, OF NORMAL GROWTH AND CHARACTER. AND MtM PROM DY5FASE OR INEESTATgft TALASAEA 44WLTANTS RE9ERIVS T e RXHTT TO REQUIRE TN9N.AC SRT OR 5UESTTHUTIO9 OF ANY PLANTS DEEMED UNSUITABLE 4. TREES SHALL HAVE UNIFORM BRANCHING, SINGLE STRA16HT TRIMK5 OUYESS SPECIFIED AS MILT -STINK N7LTI-CAE, OR MULTI -TRUNK), AND AN INTACT AND UNDAMAGED CENTRAL LEADER CONTAINER STOCK SHALL HAVE BEEN GROWN IN A SEC. 29, TWP 21 N, R4E W.M. CONTAINER FOR AT (FAST ONE FULL GROWING SEASON AND SHALL HAVE A WELL DEVELOPED ROOT SYSTEM. PLANT MATERIAL THAT IS ROOT -BOUND OR HAS DAMAGED ROOT ZONES OR BROKEN ROOT BALLS HILL NOT BE ACCEPTED. 5. CONIFEROUS TREES SHALL BE NURSERY GROWN, FULL AND BUSHY, WITH UNIFORM BRANCHING AMID A NATURAL, NON -SHEARED FORM. OR16INAL CENTRAL LEADER MUST BE HEALTHY AND UNDAMAGED. MAXIMUM GAP BETWEEN BRANCHING .AWN NOT EXCEED 9 INCHES, AMID LENGTH OF TOP LEADER SHALL NOT EXCEED 12 INCHES. 6. SHRUBS SHALL HAVE A MINIMUM OF THREE STEMS AND SHALL BE A MINIMUM HEIGNT OF 18 INCHES. T. TREES AMID SHRUBS SHALL HAVE DEVELOPED ROOT AND BRANCH SYSTEMS. DO NOT PRUNE BRANCHES BEFORE DELIVERY. 8. NATIVE PLANT CUTTINGS SHALL BE GROW AND COLLECTED IN THE MARITIME PACIFIC NORTHWEST CUTTINGS SHALL BE OF ONE TO TWO -YEAR -OLD WOOD, ''A INCH DIAMETER MINIMUM, CUTTINGS SHALL BE A MINIMUM OF 4 FEET IN LENGTH WITH 4 LATERAL BIAS EXPOSED ABOVE GROUND AFTER PLANTING. THE TOP OF EACH CURING SHALL BE A MINIMUM OF I INCH ABOVE A LEAF BUD, THE BOTTOM CUT 2 INCHES BELOW A BID. THE BASAL ENDS OF THE CUTTIN ISS SHALL BE CUT AT A 45 DEGREE ANGLE AND MARKED CLEARLY 50 THAT THE ROOTING BID 15 PLANTED IN THE SOIL. ClITIN66 MUST BE KEPT COVERED AND MOIST DURING STORAGE AND TRANSPORT, AND NO CUTTINGS SHALL 13E STORED MORE THAN THREE DAYS FROM DATE OF CUTTING. CUTTINGS SHALL ONLY BE USED IF PANTINS OCCURS BETWEEN DECE! IST AND APRIL IST. FOR PLANTINI6 BETWEEN APRL UST AND DEGEMBETR 1ST, CONTAINER PLANTS SHALL BE USED. 9. PLANTS SHALL BE FREE OF SPLITS AND CHECKS, BARK ABRASIONS, AID DISFIGURING KNOTS. IO.FOR DECIDUOUS PLANTS. BIDS SHALL BE INTACT AND REASONABLY CLOSED AT T4ME OF PLAlitINS, IF GGq II. BALLED AND BURLAPPED PLANTS SHALL HOLD A NATURAL BALL MANUFACTURED ROOT BALLS ARE UNACCEPTABLE. 12.19 ANTS SHALL CONFORM TO SIZES INDICATED ON THE PANT SCHEDULE. PLANTS MAY BE LARGER THAN THE MINIMUM SIZES SPECIFIED. C. NOXIOUS SPECIES, ALL PLANT STOCK AND OTHER RE -VEGETATION MATERIALS SHALL BE FREE FROM THE S® OR OTHER PANT COMPONENTS OF ANY NOXIOUS OR INVASIVE SPECIES, AS IDENTIFIED BY THE KING COUNTY NOXIOUS NEED CONTROL BOARD. D. SUBSTITUTIONS, SUBSTITUTIONS WILL NOT BE PERMITTED WITHOUT A WRITTEN REGTITST AND APPROVAL FROM THE OWNERS REPRESENTATIVE, TALASAEA GONSILTANT5, AND APPLICABLE AGENCIES. 22 PANTING SOIL A. TOPSOIL, IF SUITABLE STOCKPILED NATIVE TOPSOIL 15 NOT AVAILABLE FOR MITIGATION PLANTINGS, TOP501L SHALL BE OBTAINED FROM OUTSIDE SOURCES. STOCKPILED OR IMPORTED TOPSOIL SHALL BE FERTILE, FRIABLE, SANDY LOAM SURFACE SOIL, FREE OF SUBSOIL, CLAY LUNHP5, BRUSH, HE075, ROOTS, STUMPS, STONES LARGER THAN I INCH IN ANY DIMENSION LITTER OR ANY OTHER EXTRANE-OLS OR TOXIC. MATTER HARMFUL TO PLANT 6ROWTH. B. ORGANIC CONTENT, IMPORTED TOPSOIL SHAH CONSIST OF ORGANIC, MATERIALS AMENDED AS NECESSARY TO PRODUCE A BULK ORGANIC CONTENT OF AT LEAST IO PERCENT AND NOT GREATER THAN 20 PERCENT, AS DETERMINED BY AASNTO-T-194. C. CREST, COMPOST SHALL MEET THE DEFINITION FOR COMPOSTED MATERIALS AS DEFINED BY THE WASHINGTON STATE DEPARTMENT OF ECOLOGY. D. SOIL At' WOODY PLANTINGS SHALL BE FERTILIZED WITH A SLOW -RELEASE GENERAL GRANULAR FERTILIZER 06-16-161, WITH APPLICATION RATES A5 SPECIFIED BY MANUFACTURER FERTILIZER SHALL BE APPLIED AFTER PLANTING PIT 15 BACKFILLED, AND PRIOR TO APPLICATION OF MLCH. FERTILIZER SHALL NOT BE APPLIED BETWEEN NOVEMIBER AND MARCH. 23 MULCH A. BARK OR HOODGHIP NULGH SHALL BE DERIVED FROM DOU_i.AS FIR PIKE OR HEMLOCK SPECIES. THE MULCH SHALL 4OT CONTAN REf?tK TANNIN OR OTTER COMPOM05 IN GUANTHTIS THAT WOULD BE DETRIMENTAL TO ANIMAL PLANT LIFE OR WATER QUALITY. B. MULCH SHALL BE GROANED 50 THAT A MINIMUM OF 45% OF THE MATERIAL WILL PASS THROUGH A 15-INCH SIEVE AND NOT MORE THAT 55516, BY LOOSE VOLUME, WILL PASS THROUGH A US NO. 4 SIEVE. 2.4 MISCELLANEOUS MATERIALS A STAC£5_ D'rA,OM@LARD_GUY_ SLAKES. SOLID, DURABLE, WESTERN RED CEDAR OR OTFHBR APPROVED WOOD, FREE OF INSECT OR FUNGUS INFESTATION. B. CHAIN -LOCK TREE TIES, YHNCH WIDE, PLASTIC PART 5, EXECUTION 3.1 SOIL PREPARATION A. - CONTRACTOR SHALL VERIFY THAT PLANT INSTALLATION CONDITIONS ARE SUITABLE WITHIN THE PROJCT ARE S). ANY UNSATISFACTORY 00140MONS SHALL BE CORRECTED PRIOR TO START OF WORK. WHEN CONDITIONS DETRIMENTAL TO RANT GROWTH ARE ENCOUNTERED, SINCE AS RABBLE FILL, POOR DRAINAGE, COMPACTED SOILS, SIGNIFICANT EXISTING OR IWA51VE VEGETATION, OR OTHER OBSTRUCTIONS, CONTRACTOR SHALL NOTIFY TALA5AEA CONSULTANTS PRIOR TO PLANTING. THE BEGINNING OF WORK BY THE CONTRACTOR CONSTITUTE ACCEPTANCE OF CONDITIONS AS SATISFACTORY. B. PLANTING SOIL, IN ALL 6RAVE D/GLEARgLRIC+a;1BBE7 PRO.EGT AREAS, 9 INCHES OF STOCKPILED OR IMPORTED TOPSOIL SHALL BE PLACED OVER SLBSRADE, OR EXISTING SOILS SHALL BE AMENDED WITH COMPOST TO CREATE THE EGUIVALENT OF A 9-INCH DEPTH OF TOPSOIL. C. NEWLY>ti IH raancnr_.I EAvcnrrciPwen AREAS. PLAITS SHALL 13E INSTALLED IN NJlL�LY PAGm OR ANETDm TOPSAIL. D, SC71L GESOM�ACTl01R5GARICATIONt SOILS IN GRADED/D15TURBED AREAS THAT ARE COMPACTED AND UNSUITABLE FOR PROPER PLANT GROWTH SHALL BE DECOMPACTD AND/OR SCARIFIED TO A MINIMUM DEPTH OF 6- PRIOR TO TOP501L INSTALLATION 9.2 PLANTING A PANT LAYOUT, PROPOSED LOCATIONS OF TREES AND SHRUBS SHALL BE STAKED AND IDENTIFIED WITH AN APPROVED CODINS SYSTEM OR BY PACD*W OF THE ACTUAL PANT MATERIAL. FOR LARGE GROUPINGS OF A SINGLE SPECIES OF SHRUB, LANDSCAPE CONTRACTOR MAY STAR THE PLANTING BOUNDARIES. B. OBTAIN LAYCUY A3NROJAL 1`992C. j TAIASAEA CONSULTANTS PRIOR TO EXYAVATI�N OF PLANTING PITS. C. EL4H?Ifi9 PIT,-mSmsf4ME,: I. PIT DEPTH, NOT TO EXCEED THE ROOT BALL OR CONTAINER DEPTH. 2. PIT WIDTH, MEASURED AT THE GROUND SLAWACE, 2 TIM125 THE WIDTH OF THE ROOT BALL OR CONTAINER AS INDICATED IN TYPICAL PLANTING DETAILS. a.BARE-ROOT PLANTS, DIAMETER EQUAL TO THE WIDTH OF THE ROOT SPREAD. D. SEIDNSO,ANTS, I. BALLED PLANTS, SET PLANTS IN POSITION AND BACKFILL 1/2 DEPTH OF BALL. COMPLETELY REMOVE GAGE AND TANS FROM PLANT AND RILL BURLAP DOWN AS FAR AS POSSIBLE. COMPLETE BALKFILL AND SETTLE WITH WATER ROOT COLLAR SHALL REMAIN I INCH ABOVE ADJACENT GRADE. 2. BARE -ROOT PANTS, PRUNE BRUUSED OR BROKEN ROOTS. SET PANT IN POSITION AND PACE WETLAND PANTNS 501L AROUND ROOTS. USE CARE TO AVOID BRUISING OR BREAKING ROOTS WHEN FIRMING SOIL. SETTLE NTH WATER. 9. SHRUIMTREE PANTING, SHRUB AND TREE STOCK SHALL BE PANTED IN HAND -DUG HOLES ACCORDING TO PANTING DETAILS SHOWN ON THE MTGATION PANS. SHRUB AND TREE ROOT BALLS SHALL BE SET SO THAT ROOT COLLARS ARE I INCH ABOVE ADJACENT GRADE. ALL SACKFILL 5HALL BE GENTLY TAMPED IN PAGE. 4. SURFACE FINISH, FORM A SAUCER A5 INDICATED ON TYPICAL PLANTING DETAILS, OR AS DIRECTED. GRADE SOIL TO FORM A BASIN ON THE LOWER SIDE OF SLOPE PLANTINGS TO CATCH AND RETAIN WATER. 5. IN FORESTED AREAS, CONTRACTOR SHALL LOOSELY TIE A 2 FOOT PIECE OF BIODEGRADABLE R A661W TO THE TOP PORTION OF ALL PLANTED VEGETATION TO FACILITATE POST -CONSTRUCTION PERFORMANCE AND MAINTENANCE REVIEW BY TALASAEA CONSULTANTS AND REGULATORY ASBNGIE5. 6. ACTUAL PLANT SYMBOL QUANTITIES SHOWN ON THE PLANS SHALL PREVAIL OVER QUANTITIES 540M ON THE RAM SCHEDULE IN THE EVERT OF A DISCREPANCY. E. M7LCHINSL I. 6RADEDICLFARfp/6fiF D BUFFER AREAS, SHALL BE MULCHED AFTER TOPSOIL INSTALLATION AMID PRIOR TO PLANT INSTALLATION WITH A 3-IN0H LAYER OF MEDIUM BARK MLGH. 2. NON-6RADFD BUFFER AREAS, PROVIDE A 36-INCH DIAMETER, 3-INCH DEEP MA -CH RING AROUND THE BASE OF EACH TREE, AMID A 24-I140H DIAMETER 5-INCH DEEP KLGH RIN5 AROUND THE BASE OF EACH SHRUB.. 3. WATER PLANTS THOROUGHLY AFTER MULCHING. F. SING, PRUNE IMMEDIATELY AFTER PLANTING ONLY AS DIRECTED BY TALASAEA CONSULTANTS. 6. TREE STAKES AND TIES, STAKE DECIDUOUS AND EVERSREEN TREES 4 FEET OR OVER IN HEIGHT WITH ONE N STAKE PER TREE. STAKE TREES IMMEDIATELY AFTER PANT1,16. PLACE STAKE AT THE OUTER EDGE OF THE ROOTS OR BALL, IN LIME WITH THE PREVAILING WIND, AND AT A IO DEGREE ANGLE FROM THE TREE TRW LOOSELY ATTACH STAKE TO TREE USING, CHAIN -{JOCK TIES, TREE SHOULD EE ABLE TO SWAY. H FLAGGING, ALL MEW PLANTS SHALL BE MARKED WITH A PIECE OF COLORED SURVEYORS FLAGGING, TO FACILITATE IDENTIFICATION FOR FUTURE MONITORING. FLAGGING SHALL BE TIED TO THE TOP OF EACH PANT. DHSTALHNS TEI£,7TARY lRR16ATNCNR I. GBCfiAL FiEdU CONTRACTOR SHALL PROVIDE AN ABOVE -GROUND TEMPORARY IRRIGATION SYSTEM CAPABLE OF FULL HEAD-TO41SAD COVERAGE OF ALL CLEARED a 646BEP PLANTED PROJECT AREAS. THE TEMPORARY IRRIGATION SYSTEM SHALL EITHER UTILIZE CONTROLLER AND POINT OF CONNECTION (POI-) FROM THE SITE IRRIGATION SYSTEM OR SHALL INCLUDE A SEPARATE PO-1 AND CONTROLLER WITH A BACKROW PREVBMON DEVICE PER WATER JURISDICTION INSPECTOR AND APPROVAL. THE SYSTEM SHALL BE ZONE TO PROVIDE OPTIMAL PRESSURE AND UNIFORMITY OF COVERAGE, AS WELL AS SEPARATION BETWEEN AREAS OF FULL SUN AND SHADE AND FOR SLOPES N EXCESS OF 5 PERCENT. 2.5nLU2 =lS,N A,ND MATERIALS. ELECTRONIC VALVES SHALL BE THE SAME MANIFACTURIER AS THOSE USED FOR THE SITE IRRIGATION SYSTEM, OR SHALL BE RAIN BIRD FEB SERIES OR EQUAL IF SYSTEM 15 NOT CONTIGUOUS WITH THE SITE SYSTEM. VALVES SHALL BE SIZED TO ACCOMMODATE PRESSURE AND ZONE CONSUMPTION REQUIREMENT5 OF THE SYSTEM AND SHALL BE INSTALLED BELOW GRADE IN CAR50N (OR ESIUAIJ VALVE BOXES. WIRING SHALL BE INSULATED MULTI -STRAND, TAPED TO THE MAIN AT 6-INCH INTERVALS WITH DUCT TAPE WRAPS. ON-6RADE MAIN AND LATERAL LINES SHALL BE CLASS 200 PVG BELL PPE WITH SOLVENT WELDED FITTINGS, SECURED IN -PLACE WITH HIRE STARES WERE NECESSARY ON SLOPED AREAS. LINES SHALL BE PLACED 12 INCHES BELOW GRADE IN 4 INCH PGV SLEEVES WHERE VEHICULAR OR MAINTENANCE ACCESS 15 NEEDED ACROS6 LINES TO THE PROJECT AREA(S). MAXIMUM MAIN LINE SIZE SHALL BE IA INCHES AND MAY BE LOOPED BACK TO THE POWC, TO REDUCE PRESSURE LOSS. LATERAL LINES SHALL BE SIZED IN DECREASING, DOWNSTREAM ORDER PER RAIN BIRD DESIGN STANDARDS, THE MINIMUM LATERAL SIZE SHALL BE % INCH. HEADS SHALL BE ROTOR OR IMPACT TYPE INSTALLED 4 FEET ABOVE FINISHED SPADE ON 2-INCH DIAMETER WOOD TREE STAKES. STAKES SHALL BE SECURE IN THE GROUND, EMBEDDED TO A MINIMUM DEPTH OF 24 INCHES. HEADS AND % INCH PVC RISERS SHALL BE SECURED TO STAICES WITH CONSTRICTING HOSE CLAMP51 NO FUMY PIPE SHALL BE USED. HEADS AND NOZZLES SHALL PROVIDE HATCHED PRECIPITATION RATS FOR EACH ZONE. 3. H-RL16RA.•MnN6, IRRIGATION SYSTEM SHALL BE PROGRAMMED TO PROVIDE APPROXIMATELY I/2 INCH OF WATER EVERY THREE DAYS WRING THE DRY SEASON (APPROXIMATELY JUE 15TH TO OCTOBER ISTH). IRRIGATION AMOUNTS IN ZONES LOCATED IN THE SHADE OR ON STEEP SLOPS MAY BE REDUCED IF APPROVED BY TALASAEA CONSULTANTS OR THE PROJECT ECOLO615T/13IOLOSIST. 4. WATER AND PD14`£.S _ Y c0R5Y5TF�7, THE OWNER SHALL PROVIDE WATER AHED ELECTRICITY FOR THE SYSTEM. 5. AS -BUILT DRAWING, A CHART DESCRIBING THE LOCATION OF ALL INSTALLED OR OPEN ZONES AND YORRESPONDIN6 CONTROLLER NUMBERS SHALL BE PROVIDED BY THE CONTRACTOR AND PLACED INSIDE THE CONTROLLER AND GIVEN TO THE OWNERS REPRESENTATIVE. 6, WARRANTY, THE IRRIGATION SYSTEM SHALL INCLUDE A ONE-YEAR WARRANTY AGAINST DEFECTS IN MATERIALS AND WORKMANSHIP FROM THE DATE OF FINAL PROJECT ACCEPTANCE, THE WARRANTY SHALL INCLUDE SYSTEM ACTIVATION AND WINTERIZATION FOR THE FIRST YEAR AND IMMEDIATE REPAIR OF THE SYSTEM IF IT 15 OBSERVED TO BE MALFLWTIONIN6. J. MT16AL AREAS PTiYs AuD V&61 INSTALL GRITICAL AREAS PENCE AID CRITICAL AREAS SIGNS WHERE SHOWN ON PLANS PER INSTALLATION DETAILS PROVIDED ON PLANS. K. IREr TORE ExISrIHLs 11ATLINAL gRl'7h"6ch°EP AREAS, I. EXISTING NATURAL OR LANDSCAPED AREAS THAT ARE DAMAGED DURING CONLSTRIUCTION SHALL BE RESTORED TO THEIR ORIGINAL CONDITION, UNLESS IMPROVEMENTS OR MODIFICATIONS ARE SPECIFIED FOR THOSE AREAS. 2. CONTRACTOR SHALL EXERCISE CARE TO PREVENT INUZY TO THE TRW ROOTS, OR BRANCHES OF ANY TREES OR SHRUBS THAT ARE TO REMAIN ANY LIVING, WOODY PANT THAT 15 DAMAGED DURING CONSTRUCTION SHALL BE TREATED WITHIN 24 HOURS OF OCCURRENCE, AND TALASAEA CONSULTANTS SHALL BE NOTIFIED IMMEDIATELY OF THE INCIDENT. DAMAGE TREATMENT SHALL INCLUDE EVENLY CUTTING BROKEN BRANCHES, BROKEN ROOTS, AND DAMAGED TREE BARK. INJURED PANTS SHALL BE THOROUGHLY WATERED AND ADDITIONAL MEASURE SHALL BE TAKEN AS APPROPRIATE, TO AID IN PANT SURVIVAL. L. FINAL ITiPLtTIO!L AbV-APPROVAL. THE CONTRACTOR SHALL NOTIFY TALASAEA CONSULTANTS IN WRITINS AT LEAST TEN DAYS PRIOR TO THE REQUESTED DATE OF A PRO.EGT COMPLETION INSPECTION. IF ITEMS ARE TO BE CORRECTED, A PUNCH LIST SHALL BE PREPARED BY TALA5AEA CONSULTANTS AND SUBMITTED TO THE CONTRACTOR FOR COMPLETION. AFTER PUNCH LIST ITEMS HAVE BEEN COMPETED, TALASAEA CONSULTANTS SHALL REVIEW THE PROJECT AGAIN FOR FINAL ACCEPTANCE OF PLAN IM TAM-113WATION. IF PUNCH LIST ITEMS RECJURE PLANT R737.P2,B#]Ii. AND THE RL`PECTON QWj;:S OUTSIDE OF A SUITABLE P.AYTNS SF.A° L PLANTS SHALL HIE REP./,Clb DURING THE NEXT PLAURNL5 SEASON. M. ArS:1{[I, I).�y CONTRACTOR 15 RESPONSIBLE FOR VERl"NS PLANT LCCAW,6 AND GUANTRIES ON THE PANT SCHEDULE WITH THOSE RISPRISBENTED AS SYMBOLS ON THE MITIGATION PLANS, CONTRACTOR SHALL KEEP A COMPETE SET OF PRINTS AT THE JOB 517E DURING GONSTRUCTON FOR THE PURPOSE OF RECORDING IN -THE -FIELD CHANGES OR MODIFICATIONS TO THE APPROVED PLANS. THIS INFORMATION SHALL BE UPDATED ON A DAILY BASIS AS NECESSARY. I,I PART 4, ONE YEAR CONTRACTOR WARRANTY A REOPH OF MAUTEHAV,8 T✓YiaURl 8TT5: CONTRACTOR SHALL REVIEW LANDSCAPE MAINTENANCE RECOMMENDATIONS WITH A GUALIFIED YETILA D BIOLOGIST FROM TALASAEA 0ONSULTANT5 WHO 15 FAMILIAR WITH THE STATED GOALS AND OBJECTIVES OF THE PROJECT PLAN. B. MAUab6ho 6MnM CONTRACTOR SHALL MAINTAIN TREES AND SHRUBS FOR A PERIOD OF ONE YEAR FROM THE DATE OF FINAL ACCEPTANCE IN ORDER TO MAINTAIN HEALTHY GROWTH AND HABITAT DIVERSITY. MAINTENANCE ACTIVITIES SHALL INCLUDE, BUT ARE NOT LIMITED TO, (A) REPLACING PANTS DUE TO MORTALITY, (B) TIGHTENING AND REPAIRING TREE STAKES, (C) RESETTING PLANTS TO PROPER GRADES AND LFR16Hr POSITIONS, AND (0) CORRECTING DRAINAGE PROBIJ3t5 AS REGUIRED. C. IRRIGATION, I. SYSTEM MAINTR7ANCt KV REPAIR. THE CONTRACTOR SHALL BE RESPONSIBLE FOR ACTIVATING, WINTERIZING, MAINTAINING, AND CONTINUALLY VERIFYING THE ADEQUATE OPERATION OF THE TEMPORARY IRRIGATION SYSTEM FOR THE FIRST 6ROWING SEASON FOLLOWING INSTALLATION. SYSTEM FUNCTION ONCLDING, ELECTRONIC VALVE AND CONTROLLER FTUNCTIONU SHALL BE INSPECT® FOR OPERATION AND FULL COVERAGE OF ALL PLANTED AREAS DURING EACH MAINTENANCE VISIT. THE SYSTEM SHALL BE REPAIRED IMMEDIATELY IF FORD TO BE DAMAGED OR MALFUNCTIONING. SYSTEM SHALL BE PROGRAMMED AND MAINTAINED TO PROVIDE APPROXIMATELY X INCH OF WATER EVERY THREE DAYS. D. STAH;E AND TIE f EMOVAL, CONTRACTOR SHALL RB40YE TREE STAKES AND TIES ONE YEAR AFTER INSTALLATION, UNLESS RECEIVING WRITTEN PERMISSI17N FROM TALA5AEA G4NSULTANT5 TO DELAY REMOVAL OF STAKES AND TES E E$Q=H,6142,17EAII Ab CONTRACTOR SHALL CORRECT EROSION AND DRAINAGE PROBLEMS AS REQUIRED. F. IRRNSATIOH S'/ESTEll TZ9KrJA1. CONTRACTOR SHALL REMOVE IRRIGATION SYSTEM APPROXIMATELY 2 YEARS AFTER PLANTING, OR AS APPROVED BY TALASAEA CONSULTANTS. 6. FINAL MAIHTEbIHLE I39EC.lT9N h37 AFPRdJAL, UPON COMPLETION OF THE ONE-YEAR MAINTENANCE PERIOD, AN IWPECTON BY TALASAEA CONSULTANTS SHALL BE CONDUCTED TO CONFIRM THAT THE PROJECT AREA HAS PROPERLY MAINTAINED. IF ITEMS ARE TO BE CORRECTED, A PUNCH L15T SHALL BE PREPARED AND 5LO ITTED TO THE CONTRACTOR FOR CORRECTION UPON CORRECTION OF THE PUNCH LIST ITEMS, THE PRO.ECT SHALL BE REV EHED BY TALASAEA CONSULTANTS FOR FINAL CLOSEOUT OF RAN IMPLEMENTATION I, SURVEY PROVIDED BY E5M CONSULTING ENGINEERS, 85915 IST WAY SOUTH N200. FEDERAL WAY, WA 98009, (425) 415-5144. 2. SITE PLAN PROVIDED BY CPH CONSULTANTS, 153 TTH AVENUE, SUITE 100, KIRKLAND, WA 98099, (425) 285-2590. 5. SOURCE DRAWING5 IWERE MODIFIED BY TALASAEA CONSULTANTS FOR VISUAL ENHANCEMENT. 4. THIS PLAN 15 AN ATTACHMENT TO THE FINAL P^ETLANO BUFFER IMPACT AND MITIGATION REPORT PREPARED BY TALASAEA CONSULTANTS IN JJLY 2014, CALL BEPORC YOU DIO �aoo�s�esee CITYOFFEDERAL WAY APPROVED FOR CONSTRUCTION BY; DATE; UT' or NLGML ANY, GOMUIHEM tF PIAMURp R/WPBRNTNQ O [.n,4ni tY,a - I.I.a..E l•+•+I,.el., SELL rn 1YLn,. er.Ey�� N Re...W d Rnvlronentel Plnonl„` I..L �w LL O z a z Q cz LL ZD m Z g 3 S71 CLIENT DEVCO, INC. yualty cuu„� SHOO Mein Street, Sulte 301 BELLEVUE, WA 98004 PHONE: (425)453-9551 g UB CONSULTANTS SMH NannNE K 00I EnDnelMl g Imo Lhe O-wq •%WHO AIHml w W M,ea,,,r.Ew ]m I Imu,rd MI.1HI65f ,br'Rp oraR1W l INtIRER1biRY nrrn,wNm,.ram PROJECT NO. TAIL 1422 y, DRAWING W3 I QuAC SHEET-LOF 8 y I" CONSULTANTS October 5, 2015 Mr. Jim Harris Planner City of Federal Way 33325 8th Avenue South Federal Way, WA 98003-6325 RES BMMED Site Planning Civil Engineering fl�T13 ojJ� Land Use Consulting Projed Management Gny 9F C g IAL Wily RE: Kitts Corner Multifamily — City File #13-104418-000-00-UP, CPH Project No. 0024-12-017 Rock Swale in Wetland Buffer Responses to Review Comments Mr. Harris, This letter and the following enclosed information are provided in response to your August 20, 2015 review comments from Talasaea's Consultants Wetland Buffer Impact responses for the Kitts Corner Multifamily project (City file no. 13-104418-00-UP): City Staff Comments: 1- Provide the information from CPH Consultants discussed in your July 20, 2015 letter, page 5 paragraph 2, pertaining to an analysis being prepared by CPH to determine the maximum expected flow from the pipe. This information should include a recommendation of the width of any hardened wetland buffer intrusion (rock swale), which would be the minimum width necessary. Response: The upstream basin contributing to the 24-inch on -site culvert outfall appears to be substantial. The enclosed map, labeled Figure 1, shows the potential area that may be contributing to the pipe which is approximately 177 acres. To determine the expected flows a detailed analysis of the existing storm system and all detention/retention facilities would be required. We confirmed with the City that an existing basin and facility map was not readily available. Given the nature of the improvements and configuration of the storm system providing the discharge, we have determined it appropriate to consider the peak design flow as the maximum capacity of the existing 24-inch culvert flowing full. The peak design discharge was calculated to be 15 cfs as shown in the enclosed culvert capacity calculations. The 24-inch pipe flowing full would have an outfall velocity of approximately 4.6 feet per second. Per Table 4.2.2.A of the King County Surface Water Manual, the required protection at the outfall should be a 8 foot width (Diameter of pipe plus 6 feet) with a 1 foot depth of rock lining. Furthermore we recommend a trapezoidal channel of 8 feet in width, with 3:1 (H:V) side slopes, and 12 inch depth of rock lining, for the rock swale from the outfall of the pipe to the wetland. This will keep the flow velocity just under 5 feet per second when conveying the maximum expected flow of 15 cfs consistent with Table 4.2.2.A (see enclosed calculations). 2. Provide an analysis and information discussing if any potential hydrological impacts to the wetland and wetland buffer could result from this proposed point discharge at the edge of the wetland, compared to the approved plan which proposes a dispersed discharge from the 24-inch pipe at the outer limit of the wetland buffer. Response: The bypass flows from the existing 24 inch culvert would have caused potential erosion issues that were not anticipated due to larger than originally expected flows dumping on the tVrW, TTS(X65V4 swale was installed wvmcphconsultam.com Kitts Corner Multifamily Request for Additional Information CPH No. 0024-12-017 October 5, 2075 Page 2 of 2 for erosion measures. The continued use of the rock swale will reduce the potential for sediment transport provide protection for the wetland. These flows were originally directed to the wetland and buffer and once vegetation is established within the buffer and swale it will function similar to the pre - development condition. The approved design provided for a rock reinforced outfall. There was no formal dispersion facilities in the previous design. The location of this discharge was sited in the vicinity of an existing channel that was to be enhanced with the buffer mitigation. The proposed revision for a rock -lined swale at this outfall will result in reduced velocities. 3. Provide a written response how the proposed length and width of any wetland buffer intrusions meet the criteria for allowed public improvements in a wetland buffer as described in FWRC 19.175.040(3) (summarized above). Response: See separate written response from Talasaea, project biologist. 4. Provide a plan showing how the proposed rock swale would be designed and constructed in a manner that would be an ecological enhancement to the wetland buffer. Response: See separate written response from Talasaea, project biologist. Please contact me directly at (425) 285-2392 or by e-mail at Jamie@cohconsultants.com if you have questions or need any additional information to complete your review. Your prompt response and continued efforts are appreciated. Thank you. Sincerely, CPH Consultants Ja` ie B. Schroeder, PE Vike President Enclosures Figure 1 — Upstream Basin Map Conveyance Calculations Cc: Mr. Tom Neubauer (DevCo) Mr. Steve Sullivan (Heartland Construction) Ann Olsen (Talosaea Consultants) •y+���•��• �• � _ . � w F _ —.�' ate-- �+;„ , r �s.. JJIf ljjF III! {fjI l ;:.J'`r ' � '- , �`•• , '`-Y`• �- - ��� 35 •ilk �"{ N �_ s - ~ K•.:.._. -•ram_ R r.*'-,r•.� - � N �:•R -�', __ �-3-• - .�. f.�r- -�--`_ is J. LAC— Ir ��'' .� e'. a -.' • . _ KITTS CORNER•. N Reference: Aerial image 2013 from NAIP. Drainage basin area calculated using LIDAR data downloaded from the Puget Sound LIDAR Consortium. LIDAR flown 2003. Site survey data provided by CPH. TAL-1422 Area of drainage basin is approximately 7,711,591 sf Potential Drainage Basin for Rock -lined Swale (177.0 ac). No assumption has been made concerning Kitts Corner the actual drainage system of this basin. Federal Way, Washington 1 in : 700 ft Project: Kitts Corner Description: Open Channel Flow Date: 1-Oct-15 Chezy-Manning Equation Trapezoidal Channel Given: Output: Base Width Depth of Flow Side Slope x Wetted Area Wetted Perimeter Hydraulic Radius Channel Length Elevation drop Slope Manning's n Open Channel Calculations Trapezoidal Channels Determine Flow Rate of Trapezoidal Channel 8.00 ft 0.37 ft 3.00 3.33 sq. ft. 10.31 ft 0.32 ft 100 ft 3.70 ft 0.037 ft/ft 0.030 'Wetted Perimeter 10.31 ft 'Wetted Area 3.33 sq ft Hydraulic Radius 0.32 ft Velocity 4.50 fps Design Values of Manning's n Description Base width of Flow line Depth of Flow 1 vertical unit = x horizontal Wetted Area of channel Wetted Perimeter of channel Wetted area/ Wetted perimeter Channel Length Change in elevation Slope of channel Manning roughness constant Conversion 1 cfs = 448.83 gpm Channel Material n Cast Iron 0.013 - 0.015 Galvanized Iron 0.015 - 0.017 Brass and Glass 0.009 - 0.013 Concrete 0.012 - 0.014 Planed timber 0.011 Corrugated metal pipe 0.024 Natural channel, good cond 0.025 Natural channel with stones & weeds 0.035 Very poor natural drainage 0.060 Plastic or PVC 0.009 Kitts Corner I Z�` Gu►��/�`i Culvert Capacity Analysis �txi5�1�5 / Q = K * AR'/3 * S1/2 n Originial 24" Outfall K = 1.486 n = 0.024 D = 24 inches A = 3.14 ft^2 P = 6.28 ft R = 0.5 ft 5 = 0.014 ft/ft Q = 14.49889 cfs V= 4.61514 ft/s USCS units CMP Storm Drain Assuming full flow 1.4% Slope 10/1/2015 r Open Channel Calculations Trapezoidal Channels Project: Kitts Corner Description: Open Channel Flow Date: 1-Oct-15 Chezy-Manning Equation Determine Flow Rate of Trapezoidal Channel Trapezoidal Channel Given:_ Description Base Width 10.00 ft Base width of Flow line Depth of Flow 0.32 ft Depth of Flow Side Slope x 3.00 1 vertical unit = x horizontal Wetted Area 3.54 sq. ft. Wetted Area of channel Wetted Perimeter 12.04 ft Wetted Perimeter of channel Hydraulic Radius 0.29 ft Wetted area/ Wetted perimeter Channel Length 100 ft Channel Length Elevation drop 3.70 ft Change in elevation Slope 0.037 ft/ft Slope of channel Manning's n 0.030 Manning roughness constant Output: Wetted Perimeter 12.04 ft Wetted Area 3.54 sq ft Hydraulic Radius 0.29 ft Velocity 4.23 fps 7757 ::::::.:..::.;:::::::. Design Values of Manning's n Conversion 1 cfs = 448.83 gpm :nannei matenai n Cast Iron 0.013 - 0.015 Galvanized Iron 0.015 - 0.017 Brass and Glass 0.009 - 0.013 Concrete 0.012 - 0.014 Planed timber 0.011 Corrugated metal pipe 0.024 Natural channel, good cond 0.025 Natural channel with stones & weeds 0.035 Very poor natural drainage 0.060 Plastic or PVC 0.009 4.2.2 OUTFALL SYSTEMS TABLE 4.2.2.A ROCK PROTECTION AT OUTFALLS Discharge Velocity REQUIRED PROTECTION at Design Flow (fps) Greater Less than Minimum Dimensions(') than or equal to Type Thickness Width Length Height 0 5 Rock lining (2) 1 foot Diameter 8 feet Crown + 6 feet or + 1 foot 4 x diameter, whichever is greater 5 10 Riprap (3) 2 feet Diameter 12 feet Crown + 6 feet or + 1 foot or 4 x diameter, 3 x diameter, whichever is whichever is greater greater 10 20 Gabion As required As required As required Crown outfall + 1 foot 20 N/A Engineered energy dissipater required (1) These sizes assume that erosion is dominated by outfall energy. In many cases sizing will be governed by conditions in the receiving waters. (2) Rock lining shall be quarry spalls with gradation as follows: Passing 8-inch square sieve: 100% Passing 3-inch square sieve: 40 to 60% maximum Passing 3/4-inch square sieve: 0 to 10% maximum (3) Riprap shall be reasonably well graded with gradation as follows: Maximum stone size: 24 inches (nominal diameter) Median stone size: 16 inches Minimum stone size: 4 inches Note: Riprap sizing governed by side slopes on outlet channel is assumed to be approximately 3:1. 2009 Surface Water Design Manual 1/9/2009 4-31 August 20, 2015 Ann Olsen Talasaea Consultants 15020 Bear Creek Road NE Woodinville, WA 98077 Vp,ST, BUl��� CG �4 Y 7a r C Jim Ferrell, Mayor RE: File #13-104418-000-00-UP; MTTS CORNER MULTI -FAMILY Rock Swale in Wetland Buffer Dear Ms. Olsen: A0IsenCr7r talasaeaxom City staff has conducted a review of the July 20, 2015, Talasaea Consultants Response to Wetland Buffer Impact. At this time, the proposed swale is not approved. Since the storm water discharging from the 24-inch pipe comes from off -site, and the drainage for this 24-inch pipe is within a public easement, the City will review and evaluate the proposed wetland buffer intrusions under Federal Way Revised Code (FWRC) 19.175.040 (3) (2013 FWRC) essential public facilities, public utilities and other public improvements. Under this code section, improvements may be permitted within a wetland buffer, provided "the improvement must traverse the buffer because no feasible or alternative location exists based on an analysis of technology and system efficiency, and the specific location and extent of the intrusion into the buffer must constitute the minimum necessary encroachment to meet the requirements of the public facility or utility. " In order for City staff to further evaluate the proposal, please provide the following information. 1. Provide the information from CPH Consultants discussed in your July 20, 2015 letter, page 5 paragraph 2, pertaining to an analysis being prepared by CPH to determine the maximum expected flow from the pipe. This information should include a recommendation of the width of any hardened wetland buffer intrusion (rock swale), which would be the minimum width necessary. 2. Provide an analysis and information discussing if any potential hydrological impacts to the wetland and wetland buffer could result from this proposed point discharge at the edge of the wetland, compared to the approved plan which proposes a dispersed discharge from the 24-inch pipe at the outer limit of the wetland buffer. 3. Provide a written response how the proposed length and width of any wetland buffer intrusions meet the criteria for allowed public improvements in a wetland buffer as described in FWRC 19.175.040(3) (summarized above). 4. Provide a plan showing how the proposed rock swale would be designed and constructed in a manner that would be an ecological enhancement to the wetland buffer. 33325 8th Avenue South, Federal Way, WA 98003-6325 (253) 835-7000 - www.cityoffederalway.com Ms. Olsen -August 20, 2015 Page 2 Since there is no wetland biologist on staff at the City, the City will be sending your forthcoming plan to the City's wetland consultant for review and comment on the plan and to evaluate any potential hydrological impact to the wetland resulting from the proposal. This review will need to be pre -funded by Devco. Upon submittal of the updated plan, we will forward the plan to our City wetland consultant for a cost estimate of the review. Provide four copies of the updated plans, report, and any supporting information. Include the enclosed resubmittal form and submit this information through the Permit Center; please do not mail or email this information directly to me. Contact me by email at iim.liarris ci yoffede3•altivay.com or 253-835-2652 if you have any fiirther questions or need additional assistance. Sincerely, 4,"V 6_� J in arris P nner enc: Resubmittal Form FWRC 19.175.040(3) (2013 code) c: Steve Sullivan; Devco; steve.sultivanliitdevcoapts.cam Ann Dower, Senior Engineering Plans Reviewer 1 3-104418 Doc. I.D. 70567 TALASAEA CONSULTANTS, INC. 8 October 2015 RESUBMITTED NOV 10 TAL-1422 Mr. Jim Harris 2015 Planner CITY OF FEDERAL WAY City of Federal Way CDS 33325 8th Avenue South Federal Way, Washington 98003 REFERENCE: Kitts Corner Multi -family (File Number 13-104418-000-00-UP) SUBJECT: Rock Swale in Wetland Buffer Response to Review Comments Dear Jim: This letter and the following enclosed information are provided in response to your August 20, 2015 review comments regarding the rock -lined swale within the buffer for Wetland 1 of the Kitts Corner project. As you recall, an existing 24-inch stormwater pipe drains through the buffer to Wetland 1. The currently -accepted buffer mitigation plan called for the removal of non-native vegetation from the buffer (including that portion of the buffer between Wetland 1 and the 24- inch stormwater pipe). Storm events during October 2014 caused an unanticipated volume of water to be released from the stormwater pipe. This resulted in severe erosion and rilling with a heightened potential for unintended sediment deposition within Wetland 1. The project contractor installed round river rock to create a rock -lined swale to prevent further erosion and movement of sediment to the wetland. This work, while successful in its purpose, was not permitted by the City, based on the approved development plans. Therefore, the City is requiring that we demonstrate that the rock -lined swale meets the requirements outlined in §19.175.040(3) of Federal Way Revised Code (FWRC). The comment letter from the City contained four numbered items that must be addressed. Items #1 and 2 concern engineering and design aspects of the project and have been addressed in a separate letter from CPH Consultants dated October 5, 2015. We are providing responses to Items #3 and 4 below. We have provided the text of the comments verbatim in bold print (including the text of FWRC 19.175.040(3)). Our comments to the items follow immediately in italic text. We are also providing figures that illustrate design concepts for a revised rock -lined swale that fully meets FWRC 19.175.040(3) and the concerns expressed in Item #4. CITY OF FEDERAL WAY STAFF COMMENTS, ITEMS #3 AND 4 3. Provide a written response how the proposed length and width of any buffer intrusions meet the criteria for allowed public improvements in a wetland buffer as described in FWRC 19.175.040 (3) (text provided below) "19.175.040 (3) Essential public facilities, public utilities and other public improvements. The director of community development may permit the placement of an essential public facility, public utility or other public improvements in a regulated wetland buffer if he or she determines that the line or improvement must traverse the buffer because no feasible or alternative location Resource & Environmental Planning 15020 Bear Creek Road Northeast 9 Woodinville, Washington 98077 • Bus: (425)861-7550 Pax: (425)861-7549 Mr. Jim Harris 8 October 2015 Page 2 of 5 exists based on an analysis of technology and system efficiency. The specific location and extent of the intrusion into the buffer must constitute the minimum necessary encroachment to meet the requirements of the public facility or utility." The discharge point in question is an existing condition of the site. Water from two locations are commingled and discharged from the 24-inch pipe into the extended buffer area north of Wetland 1. The discharge of water prior to development occurred within a buffer area vegetated with herbaceous plants (grasses and ferns), some shrubs, and few trees. The soils at the point of discharge are Alderwood-Everett gravelly sandy loam soils, which are moderately well drained to somewhat excessively drained soils. The combination of vegetation and coarse soils allowed for dissipation and infiltration of stormwater discharges from the existing 24-inch pipe. The proposed development plan for Kitts Corner involved extensive restoration and improvement of the buffer for Wetland 1, including the area of the existing 24-inch pipe's point discharge. The originally -approved site plans called for the installation of a quarry- spall dispersion pad at the discharge point of the stormwater pipe while the remaining buffer area between the pipe and the wetland was to be grubbed to remove invasive and non-native species, garbage and debris from homeless encampments, and replanted with native trees and shrubs. In October of 2014 after initial site clearing and grading work within the buffer had been completed, a series of rainfall events occurred in the vicinity of the Kitts Corner project. The volume of water expressed from the 24-inch stormwater pipe exceeded anticipated volumes and the ability of the riprap pad to disperse flow energies. The result was erosion of soil and the development of a channel as the water flowed downgradient to Wetland 1. The amount of water and sediment being transported towards Wetland 1 exceeded the capacity of the installed silt fencing to retain. Subsequently, the silt fencing affected by the flow of stormwater was knocked down. Under these conditions, it was very likely that sediment -laden stormwater would flow into Wetland 1; a situation that required immediate rectification. The project contractor imported round river rock to fill in the eroded area from the 24- inch pipe's discharge point down to the edge of Wetland 1 (the rock -lined swale). The purpose was to prevent any additional erosional flows that could cause unintended wetland fill. Based on the condition of the rock -lined swale after the end of the rainy season, it appears that the rocks, as placed, are sufficient to withstand most all potential flows from the 24-inch stormwater pipe. The current location of the rock -lined swale is the result of existing patterns of water flow through the buffer, as shown by the erosion and channeling that occurred during October of 2014. The existing width of the rock -lined swale appears to correlate with the general width of the prior erosion and channeling. The average thickness of the rock is approximately one foot. We believe that the current rock -lined swale meets the requirements of §19.175.040(3) as designed. The rock -lined swale represents an emergency improvement of an existing condition. The location of the swale is dictated by the actual flow path of water from the 24-inch stormwater pipe to Wetland 1. No alternative or feasible location exists since Resource & Environmental Planning 15020 Bear Creek Road Northeast 9 Woodinville, Washington 98077 • Bus: (425)861-7550 Fax: (425)861-7549 Mr. Jim Harris 8 October 2015 Page 3 of 5 the current location of the rock -lined swale represents the natural drainage pathway of stormwater as dictated by site topography. It is likely that the rock -lined swale does not currently constitute the minimum necessary encroachment to meet the modeled flow characteristics from the 24-inch stormwater pipe. Minimization of the rock -lined swale will be addressed with our response to Item 4 of the current staff comments. 4. Provide a plan showing how the proposed rock swale would be designed and constructed in a manner that would be an ecological enhancement to the wetland buffer. According to the data provided by CPH, the peak design discharge for the 24-inch culvert was calculated to be 15 cfs. The 24-inch culvert flowing full would have an outfall velocity of approximately 4.6 feet per second. Accordingly, the required protection at the outfall should be an 8 foot width with a 1 foot depth of rock lining with 3:1 side slopes. The rock -lined swale as it currently exists is between seven and ten feet wide with 1 foot depth of rock lining and 3:1 side slopes. It is apparent that the width of the 3:1 slopes exceeds ten feet in some locations. Also, the contractor placed two large down logs along the left bank of the swale to aid with energy dissipation during large storm events. In addition, there appears be rock placed on both sides of the 24-inch culvert in areas that will likely never receive any water from the discharge pipe (Photo 1). Photo 1: Rock -lined swale as it currently exists. Resource & Environmental Planning 15020 Bear Creek Road Northeast • Woodinville, Washington 98077 • Bus: (425)861-7550 Pax: (425)861-7549 Mr. Jim Harris 8 October 2015 Page 4 of 5 We believe that the rock -lined swale can be easily redesigned in the field to provide the minimum amount of intrusion into the buffer and provide both habitat and aesthetic value as well. Therefore, we propose the following remedial actions, as illustrated on Photo 2 and Sheet W2.0 (enclosed).: - The existing rock -lined swale be reduced in width to be no less than seven feet wide at its narrowest, and shall not exceed 10 feet wide at its widest point to create a more sinuous channel. The excess rock will be removed from the buffer. -- The existing rock along both sides of the 24-inch culvert shall be removed so that the start of the rock lining is generally flush with the terminus of the pipe. -- Place two large boulders between the pipe's outfall point and the existing down logs to help attenuate flow velocities and energy and deflect flow away from the swale's left bank. -- Plant the new edge of the rock -lined swale with native shrubs, such as red -osier dogwood, black hawthorn and salmonberry, to increase bank protection above the rock swale, help disguise the outfall pipe and to provide habitat. Photo 2: Rock -line swale with proposed redesign. Reducing the width of the rock -lined swale and planting with native shrubs will improve the ability of the buffer to provide habitat functions to various species of birds and small mammals as well as providing a visual amenity to the community. In addition, the rock - lined swale and deflector boulders will help reduce flow energies of the stormwater and prevent the mobilization of sediments that could cause unintended filling of Wetland 1. Resource & Environmental Planning 15020 Bear Creek Road Northeast* Woodinville, Washington 98077 0 Bus: (425)861-7550 Pax: (425)861-7549 Mr. Jim Harris 8 October 2015 Page 5 of 5 NOTE: The "Approximate Wetted Edge" was determined by visual evaluation of photographs. Areas identified for rock removal represent those portions of the swale that exceed the necessary width of the swale, or in areas unlikely to ever be affected by stormwater flows. Actual areas for the removal of rock will be determined in the field based on swale width measurements and flow characteristics. The boulder placement shall be determined in the field at the time of installation to provide the maximum amount of flow attenuation, balanced with flow deflection away from the left bank of the swale. We trust that the information presented in this letter and the letter from CPH Consultants dated October 5, 2015 have sufficiently addressed your comments to allow the rock -lined swale to remain in the wetland buffer with the proposed redesign noted above. If you have any comments, questions or require additional information, please contact Ann Olsen or me at (425) 861-7550 or by email at: dteesdaleCcDtalasaea.com or aolsen@talasaea.com. We appreciate your continued efforts in reviewing the need for an allowed public improvement in the buffer for Wetland 1 at the Kitts Corner Multi -use site. Thank you. Sincerely, TALASAEA CONSULTANTS, INC. for David R. Teesdale, PWS Senior Wetland Ecologist Attachments: Sheet W2.0 cc: Tom Neubauer and Steve Sullivan, DevCo Inc. Jamie Schroeder, CPH Consultants Resource & Environmental Planning 15020 Bear Creek Road Northeast • Woodinville, Washington 98077 • Bus: (425)861-7550 Fax: (425)861-7549 ASIT241217 - arch CSIT241217 - eng WETLANDS TOPO EX. CONDITIONS CBLA241217 CUSD241217 CUW'S241217 CGRD241217 5 556TH STREET SEC. 29, TWP 21 N, R4E W.M. GRASSES] Jr' `` \�'.. •� f � R�UfJ•T5 5r�55Es1 +'�• •\♦.v �; :� � / 1 NON-NATIVE +\,•,-'aT/ f . `\�_• + ♦ `.:�+.` .:..f WEST HYL£B05 - . ti , ♦ `` ♦, ` " \` -+ � TRIBUTARr KkJIaA `+t \`♦♦♦ I 1 1 ♦ '♦ v .7 I FK SMrrARY - 4 • . . . . • . . . `+ `♦ L► _ SEHER YV \ -, OPR4 WATElZ! -SCRUB-SIiRUB ♦ ♦ + . l"IETr-AND WETLAND BLA GATE®ORY 11 ,' , tET�fjN>� I • �� � - � ` . `� _ � I06;9"12 5F ON SITE f �.� • . t —_ +., . ,• GA•TE60FZY-I` • �` 1 1 CONIFER FOREST- .♦ �7 EXiSTI NA GRAVEL I MAINTENANCE ROAD (I-M)EXISTINS =. STOWKATER FAGILITY - ^ - iyr+j':l/ IrtIl11I1. �T I I ;nl EXISTING CONDITIONS PLAN 6RAPHIC 50ALE NO&TH ( IN FEET ) 1� Oa❑ 60 Ir,� SCALE. I'-b0' ■ F1'�1-'�I III �_ - F PLANTIN5 LAYOUT KEY GRAPHIC SCALE NTH ( IN FEET) o200 4QO SCALE, I"=200' EXISTING BUFFER YEcSETATION COMMUN I_T 19S ®MOSTLY GRASS SPECIES WITH SOME NON-NA7IVE/IWA_9IVE SHRUBS • ♦� ♦ • t MIXED FOREST, M05TLY DECIDUOU5 TREES AND ;+ ♦ ♦ ♦++` SCRUB -SHRUB SPECIES RELATIVELY MATURE DOU6LA5 FIR FOREST WITH TYPICAL SHRUB/6ROUNOCOVER UNDER5TORY PLAN LEc5END —PROJECT SITE BOUNDARY EXISTING WETLAND — — — — —WETLAND &JFFER • • • -� • • • — EXISTING STREAM CENTERLINE EXISTING CONTOUR APPROXIMATE BOUNDARIES EXISTING VE6E7ATI0111 determNed by rea view of 6006LE EARTH (9A4113) and BING MAPS aerlal Imagery. v1CINITY MAP NT5 v PRO.IECT 51 TE , '�- r" SOURCE: 6006LE MAPS, KM MAP5.6006LE.COM NORTN (ACCESSED 1-3-2013) NAME: DEVCO, INC. ADDRE55: 11100 MAIN 5TREET, SUITE 301 BELLEWE, WA 98004 PHONE: (425) 453-9551 CONTACT: TOM NEUBAUER SURVEYOR NAME: E5M CONSULTING FN61KEERS A0DRE55: 33915 1ST WAY SOUTH #200 FEDERAL WAY, WA 98003 PHONE: (425) 415-5144 ENGINEER NAME: CPH CONSULTANTS ADDRESS: 733 TEH AVENLE, 51JITE 100 KIRKLAND, WA 9b033 PHONE: (425) 2b5-2390 CONTACT: MATT HOUGH, PE R H �> GGL NAME, R055 DEOKMAN 9 ASSOCIATES, INC. ADDRESS: 201 FOURTH AVE. SE PUYALLUP, WA5HIN6TON 98312 PHONE. (253) &40-q405 CONTACT: R055 DECKMAN, AIA EM/1RONMENTAL CONSULTANT NAME, TALASAEA CONSULTANTS, INC. ADDRESS: 15020 BEAR CREEK RD, NE WOODINVILLE, WA QbOTI PHONE: (425) bbl-1550 CONTACT. ANN OLSEN, SENIOR PROJECT MANAGER DAVID TEESDALE, PW5 KLI WI.2 NI.5 W2.0 hl2.I N3.0 W3.1 EXISTiN6 CONDITIONS PLAN PROPOSED SITE PLAN, IMPACTS 8 MITI6ATION OVERVIEW PLAN CLEARING, 6RUBBIN6 d HABITAT FEATURE PLAN DETAIL5 PLANTING PLAN PLANTING PLAN PLANT SCHEDULE, DETAILS d NOTES PLANTING 5PECIFI0ATION5 CALL 88" OIIE YOU DIO 7•eee-424-sees NOTES CITY OF FEDERAL WAY I. SURVEY PROVIDED BY ESM CONSULTING ENGINEERS, 33g15 15T WAY SOUTH 0200, FEDERAL WAY, WA 9b003, (425) 415-5144, APPROVED FOR CONSTRUCTION 2. SITE PLAN PROVIDED BY CPH CONSULTANTS, 733 •TT'H AVENUE, SUITE 100, KIRM-AW, WA aE033, (425) 2&5-23Q0. B. SOURCE DRAWIH63 KM MODIFIED BY TALASAEA CONSULTANTS BY" DATE: FOR VISUAL ENHANCEMENT. c0Y OF FEaM VAY, DEgmIDIT OF pANANe 4. THIS PLAN 15 AN ATTACHMENT TO THE FINAL WETLAND BUFFER ylypERMrTNO, IMPACT AND MITIGATION REPORT PREPARED BY TALASAEA CONSULTANTS IN JJLY 2014. p r•!1•Yn, MI — TO..... cnn•nll.nl., Inn. All RI�RI. Pnnnrve,l N CONSULTANTS, INC.I Resource d Envlronmcolel Plonnlne w Ix O Z a z O g � a cc: z U- o m Z °z o 0 Z L H D of z z 3 z a 3 9 CLIENT DEVCO, INC. 11100 Meln Street Suite 301 BELLEVUE, WA 98004 PHONE: (425)453-9551 g CPH CONSULTANTS 5b RRnnlq,OAIEA&Wq Lend llwo m ord • FNleawem MRem 1�IPARnwlumlw I R+IL4WAwo31 IIt61 ]BS]iw l IA[ IUM m6]]w PROJECT NO. TAIL 1422 tmAwNa Al .O SHEET-LOF 8 AS17241217 - arch CSIT241217 - eng WETLANDS TOPO D(. CONDmONS CBLA241217 CUS0241217 CUW5241217 CGRO241217 5 556TH STREET SEC. 29, TWP 21 N, R4E W.M- wr -- - I •' _ J I { ' WEST HYLEB05 TRIBUTARY 40014A _, EIL SANITARY _-N .� . , 1 BLA 1 ' WETL,�W � - . l F l I06-,4r12 5F ONSITE. CPTE60RY-Ii w ) TRENCH, TYp. • f J' PLANS ' 1 -~•L CLEARING/GRADING LIMITS PER CIVIL PLANS f l I ate L J q7a 1 PLAN LEGEND i M N I ! — — IRJDARY f EXISTING GRAVEL PROJECT 517E BO _..---- - � I � MAINTENANCE ROAD (TT'PJ EXISTING P ETLAND — ,-- --• � — WETLAND BUFFER/SEGURITY FENCE • • EXISTING STREAM CENTERLINE I EXISTING-- i STORMWATER FACILITY I I! ! I PROPOSED SITE PLAN, IMPACTS 4 MITISATION OVERVIEW PLAN - E�RAPHIC SCALE ( IN FEET ) 40 BO 180 SGALEI I`+8f7' I 1n�, Ijli• IMI i i RAISED I; OVERLOOK PLATFORM _ • -PETANI WALL _ • (5E_L G_ PVI_L-I'_LIAN_ 51 _ indD.60 . I . . . . BUFFER .q5= 5F ox. SITE VP-4 1 •� NETLANC2 WEEMS INTRUSJONS r—� MINOR GRADING FOR WALL CONSTRUCTION, 6,469 SF u DISPERSION TRENCHES AND SITE GRADING w D PEDESTRIAN TRAIL CONSTRUCTION 3S6T SF 6 1. A H BUFFER MITISATION I-MCWND BUFFER RESTORATION FOR TEMPORARY C0N5TRUGTI0N IMPACTS AREA A BUFFER RESTORATION 6,469 5F RESTORE DISTURBED SOILS WITH COMPOST OR IMPORTED TOPSOIL, IF NECE55ARY. • STABILIZE DISTURBED SOILS WITH 3-INCH DEPTH OF BARK (MULCH. • RE -VEGETATE ENTIRE AREA WITH A MIX OF NATIVE EVERGREEN AND DECIDUOUS TREES, SHRUBS AND 6ROUNDCOVER5. TOTAL BUFFER RESTORATION: 6,469 5F BUFFER ENHANCEMENT IN PASSIVE OPEN 5PACE AREAS AREA B ® BUFFER ENHANCEMENT 18 23q 5F • 6R D ENTIRE AREA BY HAND AND/OR MACHINE TO REMOVE ALL INVASIVE SPECIES AND REMOVE ANY TRASH AND DEBRIS • RESTORE DISTURBED SOILS WITH COMPOST OR IMPORTED TOPSOIL, IF NECESSARY • INSTALL HABITAT FEATURES SUCH AS DOWN LOE{, STUMPS, AND SNAGS WITH SWALLOW NEST BOXE5 • STABILIZE DI5TIIRSED SOILS WITH 5-INCH DEPTH OF BARK MULCH REVEGETATE ENTIRE AREA WITH A MIX OF NATIVE EVERGREEN AND DEGIDUOIn TREES, SHRUBS, AND GROUNDCOVER AREA C BUFFER ENHANCEMENT 4055 5F • ENHANCE EXI5TIN6 MIXED FOREST VEGETATION BY PLANTING CONIFEROUS TREES AND SELECT SHADE -ADAPTED NATIVE LARGE SHRUBS AND SMALL TREES TO FILL IN MID -STORY AND UNDER5TORY STRATA • INSTALL HABITAT FEANRES SUCH AS SWALLOW NEST BOXES ON EX15TIN95 TREES, AND LARGE WOODY MATERIAL SUCH AS 5TUMP5 AND DOWN LOFT WHERE EXISTING NATIVE VEGETATION WILL NOT BE DISTURBED AREA D BUFFER ENHANCEMENT 11,954 5F • ENHANCE EXISTING CONIFEROUS FOREST VEGETATION BY PLANTING SELECT SHADE -ADAPTED NATIVE LARGE SHRUBS AND SMALL TREES TO FILL IN MID -STORY AND UNDERSTORr' STRATA • INSTALL HABITAT FEATURES SUCH AS SWALLOW NEST BOXES ON 5E1 ECT EXISTING TREES TOTAL BUFFER ENHANCEMENT: 54,546 5F CRITICAL AREA SION5. SEE DETAIL ID 2-50ARD FENCE, SEE D.'TAIL & BUFFER BOJNDARY WITH 5EGURITY FENCE, TBD BY OWNER jPASrphM OPEN SPACE LEGEND PROPOSE' '• • "• BACE IN BUFFER (INCLUDES TRAIL), AY OPENA SPACE PLAN TASSIVE PAENIS FOR ONPTE EN SPACE REQUIREMENTS APING PLANS PREPARED 89b19 5F a Vp-I RAISED OVERLOOK PLATFORM- TO VIEW WETLAND I WITH INTERPRETIVE SIGN••, BENCH, 4 TRASH RECEPTACLE ✓,'� Vp-o WETLAND BUFFER VIEW POINT WITH INTERPRETIVE SIGN—, BENCH, 4 TRASH RECEPTACLE WETLAND BUFFER WOOD CHIP TRAIL, SEE DETAIL WIG • SEE DETAIL FOR OVERLOOK PLATFORM •• SEE DETAIL >, FOR INTERPRETIVE SIGN NOTES I. SURVEY PROVIDED BY ESM CONSULTING ENGINEERS, 55g15 15T WAY SOUTH •200, FEDERAL WAY, WA g6005, (425) 415_5144. 2. 51TE PLAN PROVIDED BY CPH CONSULTANTS, 155 TTH AVENIX, SUITE 100, KIRKLAND, WA gB055, (425) 265-23RO, 5, SOURCE DRAWINGS WERE MODIFIED BY TALASAEA CONSULTANTS FOR VISUAL ENHANCEMENT. 4. THIS PLAN 15 AN ATTACHMENT TO THE FINAL WETLAND BUFFER IMPACT AND MITIGATION REPORT PREPARED BY TALASAEA CONSULTANTS IN JULY 2014, CALL DlPOR! YOU DIO it1�100�24EE00 z m R.... rc a E Envl......lel PlennlnR ..n� a,. Heel ean- eea - n. HeAI ee,-nwr DEVCO, INC. '""y """ 11100 Main Street, Suite 301 BELLEVUE, WA 98004 PHONE: (425)453.9551 CPH CONSULTANTS SR. Plmriq - W E14 Ndr4 um umoti oti-Now INnRpmem lu mma•wR,le lW I unck,wARRolf YIvs1R9M9A]lW YfYl:la]I RR67NB www ePAeonn Ilrnl•oan CITY OFFEDBRA L WAY APPROVED FOR CONSTRUCTION PROJECT NO. TAL 1422 BY., DAM DRAWING �I•I CITY OF FMOK MAY, DER& IIOR Or PUANMO R1WPERMITNO, SHEET�OF 8 ®CAPYeIRRI 0011 � T•IA•nee Cuneull•nl�, Inn, All Right. Mr•nrnnA� ASIT241217 - arch CS17241217 - eng NETLANDS TWO EX. CONDINONS CBLA241217 CUSD241217 CUKS241217 CGRD241217 SEC. 29, TWP 21 N, R4E W.M. GLEARIN6, 6RUB51 NO 4 HAB 1 TAT FEATURE PLAN G%2APHlG SGHLEr NORTHI [ 1N FEET ) IS 30 v SCALE. I"=30' NOTES FOR GLEARIN6, SKUBBINO 4 HABITAT FEATURE INSTALLATION PART 1, &E ERAL tl j[OY[iG�N6 A LIDflA Iontrac . contractor shall shall glee Takaaeo tasultante a mhranl OF ten (10) days notice pray to beginning caetNcllm. 2. No 6W&WuCLkn Mark Mldl corner & will then. le a meal" a6twlaOa the alrallt, Tdpeapa Caeultpnta, gaeercIl, ceorng, orKVx eaiir.tork car,aoc[ors. am !ins lo+axq a contactor. the approved ptolr and spsaRkaluan shop be ra Aewad to awra qxd air part" knVhed u+derslend the titan and lFq sps[.V1c dataib nelatea to tun caroWGHvI+ dPGVlrnt.. epacrlcatb�n aAd .Its caYMaHa. 5.Localkts of exlFw!yqq udMon hove been estdolshazi by flab nrrry or obtuxad From, a 040le rawdla Ord should be dawleiderea approximate "ud not necessWk1 compieln. It ro Ifn sob MrepoesMIA9 of VIA conUvctar W. () odepwwdrdkj r.rllyy Gat occuraui of vtllny a-aftne and L2) dY[avf✓•- as aw[d ale AlKlas wdaen the mitYpNon plan areds) that are rat shpwn, but which may be al by nplerrwtativn o! IJ,e pw, '.Aldh annals) was to Ua Lleakj mocked n the lela Ypkepe* Ga,heAt4atG shalt rov+sww uy Gaaf IKla wM the rrpprooad M1altgotJan plan pear W a!a•t of ambtrlwtar. 4.Acopy d vw Ian must be m site whenever canbvctlon ro h progress, ad shall remain m 5.Ca WwLi m inlet bit psrfornea n acordoca with all agency standards, rvI.s, codas, permit +^^� ala/Or rifler ePPlkrd'a ordnahces and polabe. 6. The project owner/%Ip c It ro responsible for Obtaining any other related m required parmlte prior to the starT W conbuctbn. T. A quail = ecologist shall be on site, as nlecessay, to monitor mitigation construction and approve roman revision a ions plan, 6. During wrotructw, WGo cmkacly mx,L use traWand d curtrvdli n methods that proBent toxic subataMes and attar polimarlt. tram ark -mg Imligetlo m areas air VOW natwot wotero of the state. 9, iqr v tatNe msawroa shall be used to protect a.l tkwg storm drainage systems, axis" utllltbe, and roads. IO.The aawliraatar stain =de, sediment anal erosion controls around the project area prior to Boll Aellrbanca frarll crxsWclI- _Wlty. B.-Cd7aeLpe4LIGA11 The Following pv rido the ganral spa, F d oatMtbs anlkilah" W be rwu4eua l to complete this mitigation project, 5a o, of these ockWas maybe conducted concurrently as He project pwges.e.. I. Congat a sits meetirg bofwron the ConVxtor•, Tolawea Conultanb, and the Owner% RepresentaI to revbw Ue pmjoc[ p1ars� 2.9mvsy cleaning Ilmlt., 3.hG.41,1,. rw%a oy ad other erasion pa sedimentation control BMI% necessary far wank In the rr»»fo "���lt ��T' areas. 4.CIe r ant"non+atNGdY, lv* vegolotlon From WPW 5. Install rag 6.Aman ond con d place large Hoody materal, 7, Construct pedestrianwftrurfacs Vall within buffer. a'.Corstnrct overlook f Install benches and Interpretive ogre. 4, Canpete site cI-- and Install plod material as Indkatad on the Buffer Mltgotlon Planting Plan. IO.Install splWrall force and crrt"I area 6". 1.2 PROJECT CONDITIONS A. Contractor shall ersrel that construction related octNNkh. do "a damne off yW Features air aid wagetad[am. Tato.oea Gamsuhtarnle o all be notified lured%x6N If occldrmal damage W'Aa•a. eantrac shalt enVf, lFd, adjacent made Ord maettat 60 and trap: Gear O! ban *War Otfler dab'% Oi wi tlrwea dreg conskwclim, CfxH,'actair .than cOmpfy with tfW gohervxj jlrrodklrm% arias r*garalwg streot matH.rhanr keanIng d+'khB dcnerruauah. B. race ley chages or modlfkall" to be mwgotr*h pkan air specRlot" mwt Flan approval Nom the owner%fopfo6wricom. Talal COMvitMls. Rai grpllcable agwalos. ID WARRANTY A A cairoctar'-pra.lded warroNy "II extand fan O Prod a1 she ys.f from the data atpixp Ica1 povidtloL Phjskal e0on car the wok of III* Mctlm Is Ya dale Melon .[I dW**q[gnbbo g.lholAtat baure a—.r . PIpY WGParag kTk W, ad rawled phhcsss of such work r� been feted oa are accepted by the uwear% reprMweaNw. Tdion a CwGultant., and PART 2, PROM CT5 AND MATERIALS 2.1 HABITAT PEATURE9 A,AHWIow Nestklg Boxes I. Swalbw neabg boxes and .hall be construct al OF cede, orajpren. 2. contractor mg plrcha.e swallow meeting boxes at, oXclvaea Carwitane, (425) 81 Or. 0-90alLe Au7da cAa sty C206) 525-4465 or, e.1,111a Birds thphituad f706) 575-4001 B.',tIaQLL 5ntwlp Mall be cedar Or Pir space., 24.55 fart wIV, a minimum of eght main branches, and o G.Thterr, danhela' of 20 Inches at 9•amd level a'ta- >bWr C. »7 y]•a�, Do.n fogs raN i» cedar m Ph epocee, l,aa a iO iaOt mntr..m length, with or without mats, ad a .ir" elmelaw- at 16 Riches. Bark shall bin _PI, nmdt Enas ant have been cut Pall be dlobve aid and not blunt, D. SLt�a Stu p. sho11 be eRNar part•dec.*ded, eak ea eWrpe, air cut live rootwaes with a rJnemum of throe teal a[ trarJd 20 Fhdl,eb n dlomsier m.hWex h, trite that MM been cot shall be tlroVa bead and not bunt. E. gilder 1. Lee boulder uncovered from orI gaal.g opsrdla•rs, IF walable. 2.0me air bio-persanl minimum Giza with Low," n'7Gb my mn a,ane[P•. 22 SOPTH51.1WAGE PATH A, T-11 aurPockhg .hell be clam woodchps. See detail on mlllgatan plane. 2.5 TOPSOIL A. Topsvll that tam aeon eL- lea an-mm for novae n propc! wear.) orWnP6,ted tram oP?yIt. e7alt bG fw1l e, lrkbe," laoI surface sa1l, frog or ssixWn, clog MMfx, b%JI 1Wea40. roots, stur'pe• 6= "'I than I Lmh In ay den lk � Later, or oy ~ exVnWdn w taxtc math- ho mful top 'n+tn B. t2[gmll;_ mLL Imported topsoil .hell consh i of orgr,lc materials anleMed cs rMca.Goy W prodae a bulk C TLIK content of at least IO percent omit rat greater than 20 percent, rw deterratasO 6,J hLgFiFPT-1, 2.4 MULGH A. bark or w.00ccW mulch shall be aerlved From pWgfae fir, phe or hweack "ales. The muldl shall rat contain ream, tommh or other cmpourds In oupltltlae that would be antrmantai W animal, plant IRe or ova- gva114). B. Mitch shall be gourd w that a minimum of 45fb a the material will poes through 13-Innh slow and not more that 55%, bg base volume, w111 pws through a U5 No. 4 sears, PART 5, EXECUTION I. War Wary careyTxiw, a IxamGsd --I- -J ON Ede, and flag csawi g limns. C7etrFq limits PI depKbd on tun mutgpilan FLOW Talospp* Ca[wli f review rGvw d [approve f logyt0 ai 0190"r ItNy prior !O ay vogetatlan narrayal, It 4 Ue respansWlny ex tfa daMrpcLp tar ve+lh lt,a netwl fxaTlG'u of v k,,,en to be saved old ra0paet Iha Toasaea C;emouliant. mad N the mhgWon Plan as. necraec ry ta Owed air Gignlflca,t Oaths YarjOrIX111n 2,4alltroctor shalt eu'vey the cater Ian of .%Tassd troll. Tolasoeo Casulta" will then r ,Vow ono maduy r„al otrgrGens as naceeGe.ay to WWdd MbAOW" Of &.161" .470kad tress, No trees Mall be rail I per trail carlWattkn, d T`� ad Prat.a! t3e.t� V.e.lahm ha Rar,oe,. I. Carmrocicr Yell be responsible Por om oldhg disturbance to axs" "gatotbn located *Aside the 1ewNg lelsxb. No renamt of any vegetation shall occur HOwA prior opparol ty TaNexwaO Z.Talososa Gmsultanta shall Flog ooeetrlg voajetatbn to remain lowted MR* its mll� weds. ♦<I*rJ)Gd hwjetate shall Rai be o p read. V,^ o the Uv h &*W. by Wood, O Rant l S,LantrocWr shall axerdlo. ore to pravan nJvry e* !fin tr1r1L rods. a,a b•sr,des of trite. ad s+nab. to nwean. "wa*dj pant to roman shot Is alwaged canauuctlah ehoil be Ir,satad rrerdel. afrA• dw�ge acara, Ord TWcxceo COWAtonte shall ix raFkI of Yw4lrt. Damage treahnant &to, 1wWdr evantt dwtieg b kd- b•omI t.rokan rods, aE ran ; Urea ba^t- l=n d plaAa Yon be U y rw� and is3alaran mGpetres aha11 bG tpkem, W pypmprk tG. W aid n plant MrM�OI. C, a�eyala, Lalfrel rinerresA I, eantxtr Yk51i InSIo11 etll Isrw ~6 shown an the mRgOlc n plans prior W wY mitigatim caealrudtM. act ly Cml peter sl gn xan gk Orealan ea 1re11>511t1e. uMrc ag pteeen or cilh; lm. TdlasW Corarl Yell val6j Omd apil edalbrs of wVakxl carsrot nledslres pray to CGGTGar"gi n Migalam cowtm ctbn. 2.CanURcto- .Hal mat3wl canton cpr0nl mea.dmes F.-.4 tgotmm IvR ninon be ao dtwted wM aresw, calsref ran (.lull effa work as mecassay. Thaw xteasII renhoN N place WAR cuttarizolem I& glvwm Takraw [-0,hflFllohlO nor FYe,ewxll air location aajnsNhfne. 1L s the reepa+.RxlnN of 4e cawNrociar to Msnhorre a! .ratan cowo, NGGOM OG a*jaCemd to ar'Gn'M a`eaz w4iGm1 aNaruaedd ty TOLI C,C.heat[wta. 5.N caoL•1haS4M pvGre oM oeaaaae'a l collaee dickite, a Iorl cm6•W focilRe eshall be lm dmpa arnd w oww" OF FOR~ ty Tolaaasa C~ton G W ensure Wu ed arO* m/w*eMmyxian coNfd, 4. Hwono poselbe, natural grauld cover vegetation Pall be maintained For erosion control. D•k.,.,.r..ender.-KY!rvG srGQel�+w'i+ h'ar; mmynln,. A.ea.. I. Contractor Pall grvb out HRh nlaah" all nonylatlw and hvaelve vegetation MOM buffer mitigation PLAN LEGEND PROJECT 51TE BOUNDARY CEXISTING 11ETLAND WETLAND BUFFER/5ECURITY PENCE EXISTING STREAM CENTERLINE EXISTING FOREST/9GR1/B-SHR115 VEGETATION Area b as Yawn on the mitigation plans Min dt WI.U, with the exception of Plogged exAtng vegetation to remain. 2.GerdroGta• Shall [Jib &A by hand all Wmfol. ,b cad Wraefra w"Wtan Hia� DAfa• mrtL3olan Area C " Yarn an the mnxjobpl plans NJeek t94. Cahtractar ~ renwa nv�Pvo a 4104 x4:fdl'w3� but are Mat I1hJiee Ia. Scat% traarn, EMI Ivy, R"Oljal wd mwgevn bkacktxrry, pxpla I*aea.4MO, hedge bnaHesd ng JCyaroae W4!;GaI Canada "tic, Reed cov;Waro and Cresphg NgtRellc+i.. ul � tl bon ranmsd W lra nwdudInnen extent proeeteable- 9.CanLrxtor owl clear and alb Von Wk)a,oni corow 4. All g' vegetation shall be exported Iran the site and disposed of In an approved Taner tollow:+g air appllcd5le bcow-RalalFeaerat regulations. 5. Toteeosa 6a GulLmts shall deelgate ay oddltlonal plant spaces to be removed A," rltlgotlan corslnKILWI E. InstallS—, I. Inalall sang vpan eompWkom of clsarirglg.Wing at ecatfars depXEeo on mlORotan pions (see Detail cat. sr•agIn Yha1 bit anOvtad irda sut1CJ'ado a mnFrsm air 25 percent OP the local Ie�plh' d depkLed In dine plan daWll. Tolaooaa CawHCIMs Pall oppi owe frog acaNd,s From to YstelioEtal. P, 7Q2aalL 1. In 11 cleared and gvFbod buffer mM.Igaten areas, existing soli shall be amended for topsoil imported) to pr Ada a 9-kith minimum depth of Eapwll. 6,Hat at Feahre., Place fxb-tot features upon complatan oP tapsdl ab/or saki axGndelra placement as depicted on the mtttgallom plans. ad detains, Tolasaeo COMuearde efhatl approve {y_atlos prtdr to p!o....a d. I. Svolbw he-- soon., Attach ova m.ts%,lox to each nstalled brag a nalIn W of 15 feet OPP the 3g''arrq m Oe aOvlmaaet $40 or tun cog. Tn addition, lain 1N01 additional ►rario a most boxes Pall be krloiea an exsikg 41 within batter aMvidaxwS o'eae. of proxtroterl t5' at thin grand on do BE .Ire of tress- Exact lawkion to be doterm hod in the field by Toloecea 6a l opts. 2.22a,Laijh To wtAveak don Hogs, IWat scars the'o9 at the dawyd WI di mechanical mean, Nhan enClp IHO log at the ecwW 1Dcaum t0 afeato a nao'at look to line brook, YwWI broken ercb t0 dlydJA.e sow cuts. Hal kw rite leat have been cut &W Homo w bent oAd6s 5. mfhdpy Shupe shall be se! upright. 4.81eUders. If *•ailaLV., boulders shall be placed n piles at bast 2 rock► deep (3 rock min. per Plie), In maser that pr&Aho► both physical .tabu ny and large ntornol voldo, H. 5Me�g per�IA Construct Overlook VlewpokR at location dopkled m Sheet WI2, Per detail 4 onSties! l•Bq 1. Install Troll, I. CorobTnct sdtwface trali In wetland WPfer Mere shown on plan per Detall 6. 2. Wall Berahee per mauPacty w* sp.cNkalbrs. 5. Install Interpretive sign per Detall 2, sheet POD. J, bw.Flehg eleorK�IC YJ fLfferM1e Wreareas Did, n..dede.1.a 11 be provwed a mulch smpb prat to It I, C.-tracWr Yoh sprea7 mulch over all d[Wt od sell bufw areas that have bean cladred/gibbed to aehi.- a -I Oeptn of 5 Inches, K, takjW I. Intall brae w than on Sheet H.I. per detail I, sheet PEI 2. Into crRlcal area akJs ice Yawn m sheet WIR, per detall 5, sheet YEA. L. Prier W pNwt neWllollon, Takaeaea Carsvltonte shalt all oraarFXilq�b Nprk and f.atus plw.amont If Irene a� t* be corrected, a punch list Marl d pre/xrea b'J T' 9a aKaea Car WWI and eutmRlad to the unhlrxra far camplstbn. Alter p--, h list ItaR. fwwP YasOn congblad, TPbaea Ccrsldtarde alholi review tla project fa• f npl accap r- of p-, h list Rolaps. vmd pnamkg maH M. Llp�pjy In there ro a det*y n eualruGlbl Pmaay reason, caltroctor' shall be rsspoMble far nwaex.narwo of ruin whtrat meaemrur. *-okt gr, d temporary Frgatan during constrvctlm delog Per" corneas alferwlwee sdataa In wrung. �ZI GLEARIN6 4 6RUBBINO $ .HABITAT FEATURE URE LEGEND 5TUMF DOWN LO6 SNA5 WITH 5W4LLOW ( NEST BOX, SEE DETAIL ta5 NOTE. IN ADDITION TO A 5WALLOW NEST BOX INSTALLED ON PROP05ED SNAG, TEN (10) 51,4ALLOW NEST BOXES SHALL BE INSTALLED ON EXI5TIN6 TREES WITHIN BUFFER ENHANCEMENT AREAS. EXACT TREES AND NEST BOX LOCATIONS TO BE DETERMINED IN THE FIELD BY TALA5AEA CONSULTANTS. SILT FENCE, SEE DETAIL w GRUB ENTIRE AREA BY 16239 5F HAND OR MACHINE TO REMOVE ALL INVASIVE SPECIES AND REMOVE ANY TRASH AND DEBRIS ®SELECTIVELY GRUB OUT 4,653 SF ALL NON-NATIVE INVASIVE SPECIES BY HAND. PROTECT EX15TINS NATIVE VEGETATION TO REMAIN. JO1Hr5 IN FiLTLR Am4BRJc 9W�LL i!E SRIL® AT POSTS. 119E STAPLES, WIRE RINGS, OR EfiIIVALBTT TO AT7AGH FABRIC TO POSTS. - �7',G' B+` ]4 6w. FpRP qq ECL�vALENs. fI /— FILTER PAIAI I I F� 'fir; fib` KNIHUM 4.4• TRSI Pp$T SPAPIAS MAY 51 BD Ifk:RPJ6ED To TRl31oH "TH KRISa, IF KRIS EI IMCa HATVE So[- IS V£EV STEEL FFfIGE PC675rJ NOTE, FILTER FABRIC FENCES RJSB/hR OR EGt)IVNH/T SHALL DR INSTILLED ALON6 COROM k+ENE POSSIBLE. SILT PENCE MAINTENANCE STANDARD' 1. ANY DAMAGE SHALL BE REPAIRED IMMEDIATELY. WS 2. IF CONCENTRATED FLOARE EVIDENT UP5LOPE OF THE FENCE, THEY M)9T BE INTERCEPTED AND CONVEYED TO A SEDIMENT POND, 5, CONTRACTOR SHALL CHECK THE UP5LOPE 51DE OF THE FENCE FOR 616N5 OF CLOGGING AND S.95EQUEHT OHANHELIZATION OF PLOWS PARALLEL TO THE FENCE, IF THIS OC A R5, REPLACE THE FENCE AND/OR REMOVE THE TRAPPED S®IFENT. ED 4. SIMENT SFLALL BE REMOVED HHEN AGGUMILATION EXCEEDS 6' IN DEPTH. I xAL , DETAIL I. SURVEY PROVIDED BY ESM CONSULTING EN6IN6I!g5, 35115 1ST hIAY SOUTH 0200, FEDERAL WAY, WA 98003, (425) 415-5144, 2, SITE PLAN PROVIDED BY CPH CONSULTANTS, 7" 9T'H AVENUE, SUITE 100, KIRKLAND, WA p8035, (425) 2a,5-2NO, 3, SOURCE DRAWIN65 WERE MODIFIED BY TALASAEA CONSULTANTS FOR VISUAL ENHANCEMENT, 4, THIS PLAN 15 AN ATTACHMENT TO THE FINAL WETLAND BUFFER IMPACT AND MITIGATION REPORT PREPARED BY TALASA.I CONSULTANTS IN J)LY 2014, cJul. ee�osta YOU DIO 1.600.4Y4eBae CITY OF FEDERAL WAY APPROVED FOR CONSTRUCTION ayr DATE CRY w tum my. [tDUJFfLp/f Or vmw R/W PERMIT NO. a C"prrlanh .— - T.Iwra cmwullnn ,Imo. 611 Rlahw nnmwrr"W. N R"aaarcc d Eavlronm"mtnl Plaeeinz d..,, VI ".,ate, I C' R CLIENT DEVCO, INC. m"awy c"unla 11100 Mein Street Sulle 301 BELLEVUE, WA 98004 PHONE: (425)453.9551 g CPH CONSULTANTS Skif imirg,CMIE"ilriy Ield UK0Dm llq • Rehr Mfs0Wt la Mexu,ab NOI WM,d WAellh hex I:lflvo�n voanl uii i nihi�� PROJECT NO. 1 TAL lazz 1 DRAWING W 1.2 SHEET--LOF B ANT241217 - arch CS17241217 - ang NETLANDS TOPO Dl. CONDITIONS CBLA241217 CUSD241217 CU1N5241217 CGRD241217 rr CiNM'TFER TOR OF POST 45 DE6FS1 TO A OEM OF I' 4N ALL FOUR $IDES 4: COAT KTN 75-YF.Nd 7FJILANT 2'X6' PRESaRZ TREATED +, rW wVLS, 5PA6EO I'•6' OF.- N - - 4'X4' Pi�RIRE-41�AMEO FIR P05T AYN WR-'IRBA'MP 9D hip 517E GIPS) I 1 5'-O• FITC 1 SURFACE TO DRAIN 1 1 PIN�OHWY:E 1 \\ x• MIN�-i ONCRETE FOOTING I HTH NATIVE SOIL IIorTPALTED GRAriA AR 5uB BASE +P-12`4 BUTT- 10INT FASTENED WITH 0) 5' 4d bl>X 111AG NAILS P05T/RAIL CONNECTION NQffii 1. Fl TO ALIGN WTH LAND GRADIENT. 2. TREAT WTH GEAR PRESERVATVE UPON COMPLETION OF INSTALLATION. S. ALL FASTENERS SHALL BE 6ALVANIZm STEEL. I OPEN 2-50ARD FENCE DETAIL � TRACTOR TO DGSIGNIENHLD OVERLOOK AGLOIDING TO THE ABOVE DMISIOH9. 90 SHEET W.I FOR LOCATION OF OVERLOOK 2. taRRAOTOR SHALL SUBMIT OVERLOOK DE51ON TO TALA9EA GONSILTANTS, CITY OF FGDERAL WAY, AND DE=. INC. FOR REVOIN AND APPROVAL PRIOR TO C4"TRUGTION 5, OVERLOOK STFUGTURE AND HANDRAIL TO N6T ALL APPLICABLY BUILDING AND SAFETY CGOCYTEBUATION 5. GONIRAGTOR SHALL SECURE ALL NBUD9EARY PERMITS PRIOR TO CONS11111 1aN WETLAND OVERLOOK DETAIL SEC. 29, TWP 21 N, R4E W.M. ARE -PRINTED LAMINATED, OV RES45TANT, WEATHER PROOF 516N 517E i DESN6N TO BE APPROVED BY TALASAEA CONSULTANTS. MOUNT AT 45' ANGLE Y v �F05T To SE TREAT® POSr TO BeBE SET F'LIINH METAL 5MRRLP5 SDUREP To P05T PUTN Two %a VIA. 9AI-V. CAARIA&P BoLT5. BASE PLATE TO 0I SET V AEOvT: 6T2 FOOnNA STIRAI.P$ TO BE ANCHORED IN POOMNS A HIM UM OF 12' F:114 D ELEVATION T`RTGM SURFACE TO DRAIN `FW.N�ILL WITH NATIVE SOIL R' ml. SECTION Z INTERPRETIVE S16N DETAIL EX. 6• DEPTH OF GRADE WOOD CHIPS 2AS� LOPE NOTES 1. IL LOCATION 5HIOM81 ON PLAN 15 APPROXIMATE. TAILASAEA CONSULTANTS SHALL FIELD LOCATE AND APPROVE FINAL TRAIL ALIGNMENT IN THE UNDISTURBED BUFFER AREAS PRIOR TO TRAIL CONSTRUCTION. TRAIL SHALL BE ROUTED TO MINIMIZE DISTURBANCE TO EXISTING NATIVE VEGETATION AND ROOTS OF EXISTING TREES. 2. FINAL TRAIL AL10084ENIT SHALL AVOID ALL EXISTING SIGNIFICANT TREES AND AREAS OF SIGNIFICANT NATIVE VEGETATION. 5, OLEARING/GWIBBING OF EXISTING VEGETATION SHALL BE THE MINIMUM NECESSARY TO CONSTRUCT TRAIL. TREE ROOTS SHALL NOT BE GUT AND DISTURBANCE TO ROOTS OF EXISTING TREES AND NATIVE VEGETATION WITHIN BUFFER AREAS SHALL BE MINIMIZED TO THE GREATEST EXTENT PRACTICABLE, WOOD CHIP TRAIL DETA CRITICAL AREA PROTECTION AREA THIS AREA IS PROTECT® TO PROVIDE. WILDLIFE HABITAT AND TO MAINTAIN CRITICAL AREA(S) FUNC IONSNALUES PLEASE DO NOT DISTURB THIS VALUABLE RESOURCELqs' CONTACT CrtV OF PIDEMI.NAY roa Moae wsoamnnaN Z OU� �-12'ITIb• ALUMINUM SIGN WITH WHITE REFLECTIVE el BACKGROUND AND DARK GREEN TEXT/GRAPHICS. USE A MINIMUM OF TWO GALVANIZED OR 5TAINLE55 + STEEL LA6 BOLTS TO FIRMLY SECURE 5161, LD o0 0 Z 4' X 4' PRESSURE TREATED WOODEN P05T WITH )i` 631AI-§:ER AT TOP CONCRETE 7 NATIVE MATERIAL ,1—a'I6. NOTES; I. CRITICAL AREA 516N5 SHALL BE PLACED NO GREATER THAN 100 FEET APART AROUND THE PERIMETER OF THE CRITICAL AREA PROTECTION AREA, HHERE SHOI^W ON PLANS. 2. SIGN PLACEMENT SHALL BE SUBJECT TO THE AFPROVALOF THE CITY OF FEDERAL WAY, 5. ALL 516N5 MUST BE SECURE AND PERMANENT 3 CRITICAL AREA 916N DETAIL i CEDAR OR Pao SWb, I J x• MIN. AOTH AT r GROUND LEV1'1 III IP1 III r NJ 11 NATIVE 905SRADE - - 12• 1 V4' GI7U9F67 NypCS 5KALLOW NEST BOX 1�9NPB SHALL HAVE A MINIMUM OF EIGHT DRAW -He EVENLY DISTRIBUTED ARO.ND TWINIC, 2. MINIMCM SMAL DEPTH OF 25% OF TOTAL 5NA6 LENGTH. 5. SNAG TO BE INSTALLED A6 NEAR TO VERTICAL AS POSSIBLE, 4• BACXPILL AROUND SNAG BASE SHALL BE COMPALTIV TO A MIN. OF IIOX OF THE SOIL'S MAX. DRY DENSITY PER A.57N•D69b. 5. ATTACH ONE SWALLOW NEST BOX TO EACH SNAG APPROXIMATELY 15 FEET ABOVE GROUND WITH OPENING FAGING SO1TH. 6. SEE SPECIPICATIONS POR SUPPLIERS OF 5KALLOw NEST BOXES. COMPACTED 15AGKPILL, SEE NOTES ABOVE 6 S 6 WITH TA SCALE. WITS NOTES _ I. SURVEY PROVIDED BY ESM C40WALTINS ENGINEERS, W15 1ST WAY SOUTH 0200, FEDERAL WAY, WA 96005, (425) 415-5144. 2. 51TE PLAN PROVIDED BY ON CONSULTANTS, 755 •TTH AVENUE, SUITE 100, KIRKLAN D, WA 9W", PIZ) 255-2890. 5, SOURCE DRAHINGS WERE MODIFIED BY TALASAEA CON -TANT5 FOR VISUAL ENHANCEMENT, 4, THIS PLAN 15 AN ATTACHMENT TO THE FINAL l'&: ND BUFFER IMPACT AND MITIGATION REPORT PREPARED BY TALASAEA CONSULTANTS IN JJLY 2014• go I DEVCO, INC. Nualily cm,nu 11100 Meln G". 9uGe 301 BELLEVUE, WA 98004 PHONE: (425)453-8551 g CPB �rouoloRE CONSULTANTS ,laoo�4•eese SNiIMTnnhy�DrII61pMA111 IarA UeCawllhG � PigIalMNllPlnlnt CITY OF FEDERAL WAY Tn iPc..REli fo01 NriN,YMNNx Iqv INTUNibfx0l fNtl.xlxPlxl APPROVED FOR CONSTRUCTION PROJECT No. TAIL 1422 BY.., DATE CRY OF FWK MY,ODNIIOIT OF RNMA DRAWING W�,3 WWPERAOTNO. 6HEET--tOF 8 0 Iy.NV.ya, MIF - T.NA... l,.... 1L.M.. N,• All R%w. i•ny.+c NEXAND P . AN TOPO . p7p' A�Q,! rryT �!i !.'1 =+ Vii �I� ^�rL��4} •� +�, p �� ■d�� iaWi S p 'Id9w co ..a�, -� TIE IN TO CIVIL 5ILT FENCE ' 0� �a I l /j • r •- rIl • - 5 %J IS 11_ ss ---- ss ss ss -" `r } I H / VT \ SOFT SURFACE TRAI WETLAND I Q3,320 5F ON SITE r\ CATEGORY II PI -ANTI N6 AREA A PLAN LEGEND (SRAPHIC SCALE NORTH �_� PROJECT SITE BOUNDARY \ ( IN FEET) C . •`� EXI5TIN6 WETLANDS WETLAND BUFFER/SECURITY FENCE O 2O 40 — } • — EXISTING STREAM CENTERLINE v SGALEI I"=20' EXISTING FOREST/SGRUB-SHRUB VEGETATION PLANT LIST LARGE TREES MASSING, SHRUBS KEY SQIEN71FIQ NAME COMMON NAME KEY SCIENTIFIC NAME COMMON NAME ER MAGROPHYLLUM B16-LEAF MAPLE G0RNU5 ALBA DOGWOOD Q MAHONIA AGNIIF0LIUM TALL 0RE60N GRAPE Q BETULA PAPYRIFERA PAPER BIRCH Q R05A 6YMN0CARPA BALDHIP R05E GORNUS NUTTALLII PACIFIC P060400D ® ROSA NUTKANA NOOTKA R05E + P5EUD0TSUSA MENZIE511 D0UGLA5 FIR PSEUD0T5USA MENZIE511 FRANSULA PURSHIANA 0 DOUGLAS FIR CASCARA Oo ® RUBUS PARVIFL0R115 RUBU` SPEGTABILIS THIMBLEBERRY SALMONBERRY [�1 THUJA PLIGATA WESTERN RED CEDAR (D 5YMPH0RICARPU5 ALMS COMMON SN0WBERRY THUJA PLIGATA WESTERN RED CEDAR TSUKA HETEROPHYLLA WESTERN HEMLOCK TSU&A HETEROPHYLLA WESTERN HEMLOCK SMALL TREES/LARGE SHRUBS KEY SCIENTIFIC kAMi COIwF+fON NAME {. ACER GIRGINATUM VINE MAPLE O AMELANGHIER ALNIFOLIA SERVICEBERRY ® GRATAEGUS D0USLA511 BLACK HAWTHORN H0L0D15GU5 DISCOLOR OCEAN SPRAY ® OEMLERIA CERASIF0RM15 INDIAN PLUM ® RHODODENDRON PACIFIC MAGROPHYLLUM RHODODENDRON SAMBUGU5 RAGEM05A RED ELDERBERRY �OD S0RBU5 51TCHEN515 51TKA MOUNTAIN ASH G,ROUNDCOVER5m KEY SCIENTIFIC NAME COMMON NAME ND 6AULTHERIA SHALLON 5ALAL room aPPN P0LY5TICHUM MUNITUM SWORD FERN •6R0UNDCOVER SYMBOLS ARE NOT SHOWN ON PLANS. 6R0UNDC0VER SPECIES SHALL BE LOCATED IN BETWEEN TREE AND SHRUB GROUPINGS WITHIN BUFFER MITIGATION AREAS A t B. IN AREAS LESS THAN B' WIDE AT THE TOE OF ANY RETAINING WALLS AT BUFFER PERIMETERS (E.6. BUFFER RESTORATION AREAS DISTURBED BY 51TE GRADING OR WALL CONSTRUCTION, SEE BUFFER INTRUSION AREAS DEPICTED ON SHEET N14, GR0UNDC0VER5 SHALL BE FIELD LOCATED BY TALASAEA CONSULTANTS. GRADING LIMIT FOR Z a CIVIL 517E WORK In `� I �►1 1L�7J ti% I �� TA' LEA CONSULTANTS, INC. 4/ { Re:ourc d {� I Envlronm Mlal PI ennlny f f!f I 0 O1 u { G v f�— 100' BUFFER — ICI 1�1 'i Ilw w rrw w w r�R w w I� MATCH LINE TO PLANTING AREA B a o r 1 v I r � a ,N a 0 4 ylsi ' Q o l CALL DE P0M YOU DIO w• w 14600"04S0N NOTES I. SURVEY PROVIDED BY ESM CONSULTING ENGINEERS, 334115 1ST WAY 50VTH r200, FEDERAL WAY, WA g8003, (429) 415-5144. 2. SITE PLAN PROVIDED BY GPH CONSULTANTS, 755 TTH AVER&, SUITE I00, KIRKLAND, WA g6O53, (425) 265-25g0. 5, SOURCE DRAWIN65 WERE MODIFIED BY TALASAEA CONSULTANTS FOR VISUAL ENHANCEMENT, 4. THIS PLAN 15 AN ATTACHMENT TO THE FINAL HETLAND BUFFER IMPACT AND MITIGATION REPORT PREPARED BY TALASAEA CONSULTANTS IN JULY 2014. CITY 0FFED6RAL WAY APPROVED FOR C0NS9RUMION BY: DAM' m OF Fmm my,, OO Kfrm 1.T or Piro" BMPFRI4TNO. C e•e,. e••I rol, t,,... •, [�vrY..�.t W uP IYL.. n..,P..n. z 3 z g $ z Z R 0 W NZ L = LI LL U m Z 0 DEVCO, INC. if100 Meirt5lnet SulEo 301 B1 LEWE, WA 99004 PHONE: (425)453-9551 4' CYH CONSULTANTS 9M HNminO. CMI Tn/1w" land Ur OvwIIIN . Flopq Hwom "MMsnw 6m 10G I NPa.r4MMW -I.M OM MI-14MIMSMa PPPen,YI1r P11.PeP, TAL//1422 MO Wi.O SHEET-!- OF� ASI7241217 - arch CS17241217 - eng WETLANDS TWO EX. CONDITIONS CBLA241217 CUSD241217 CUKS247217 CGRO241217 MATGHLINE TO PLANTING AREA A ■ i i i i i i i i �■ g5,31Q' AND I <, ' 5F ON 51, Cy�TEC�JoRY I I f SOFT SURFACE TRAIL r D � of i / J J r1 \ J _ rfk11 2-BOARD FEHGE--• •r � � � O O r • s � 6RADIIr4 LIMIT FOR CIVIL SITE WORK AV GRAPHIC SCALE ( IN FEET ) 10 20 40 SCALE, 1"r 20' SEC. 29, TWP 21 N, R4E W.M. I ry I i PLANTIN& AREA G GRAPHIC SCALE NOATH ( IN POET ) f 20 40 SCALE.1"-20' PLAN LE6ENa — — — — PROJECT 51TE BOUNDARY C. EXI5TIN6 WETLAND — -- — — — HETLAND BUFFER/SECURITY FENCE • • —�-- • - • — EX15TINS STREAM CENTERLINE ' _• 1 EXISTING, FOREST 4 SCRUB-5HRUB VEGETATION b 1� LFI4 INS LIMIT GRADING l MIT FOR `'f CIVIL SITE WORK i PLANTINGS AREA D GRAPHIC SCALE NOWN ( IN FEET) rR O 10 20 SCALE,1"-20' Im a WETLANL';.2 r,grI2 SNON 51TE- GATI-GORY.11 \ FA N x .o.-e a Eovlronmontol PlennlnR x.. ,uh r, • x"m • w 1 W r, •xw PLANT LIST _ LARGE TREES SMALL TREES/LARGE SHRUBS MA551N6 SHRUBS cr KEY fZIENTIPIC NAME KEY 5GIENTIFIG NAME KEY SCIENTIFIC NAME w MAGROPH'(LLUM �IAGER GIRGINATLM Q GORNUS ALBA Z Lu = �u MAHONIA AGUIFOLIUM O :3 m )P BETULA PAPYRIFERA V AIIELANGHIER ALNIFOLIA 0 (D ROSA 6YMNOCARPA U Q d ; • GORN)S NUTTALLII GRATAEGU5 DOU6LA511 V J Z (� PSEUDOTS1.16A MENZIESII HOLODISGUS DISCOLOR ® ROSA NUTKANA Q Z q _�] +' PSEUDOT5U6A MENZIESII ® OEMLERIA GERASIFORMIS O Rueus PARVIFLORUS o ® RUBU5 SPEGTABILIS y 3 d FRAN6UI,A PURSHIIANA O RHODODENDRON MACROPHYLLUM PLIGATA SYMPHORIGARFUS ALMSTHUJA OO SAMENN.U` RAGEMoSA THUJA PLIGATA � SITCHENS15 6ROUNDGOVERS" KEY SCIENTIFIC NAME CLIENT 7-� INC.5ORBU5 DEVCOr I T5U6A HETEROPHYLLA 6AULTHERIA SHALLON .... Wflem SSS00 Mein Stree65uRe 301 e%Sue30 TSU6A HETEROPHYLLA ,� Immom POLYSTIGHUM MUNITUM BELLEVUE, WA 98004 PHONE: (425)453.9551 g 1 •GROUNDGOVER SYMBOLS ARE NOT SHOWN ON PLANS, BROUNDCOVER SPECIES SHALL BE LOCATED IN BETWEEN TREE AND 5HRU5 GROUPIN65 WITHIN BUFFER MITIGATION AREAS A e B. IN AREAS LESS THAN 9' HIDE AT THE TOE OF ANY RETAINING HALLS AT BUFFER PERIMETERS (E,6• BUFFER RESTORATION AREAS P15TLRMD BY SITE GRADING OR WALL CONSTRUCTION, SEE BUFFER INTRU51ON AREAS DEPICTED ON 5HEET WI,U, 6RMNIDCOVER5 SHALL BE FIELD AtMk�LLseFppe YOY OIO /� "�' '�' LOCATED BY TALA5AEA CONSULTANTS, 7800.4LLeeee \/`./' 1�,J1 CONSULTANTS o Runty - 0" Lroann Ald Ua Cm" • N" rurvi�n,.,..mamo i uwsvgov NOTES NOT FAR I. SURVEY PROVIDED BY E5M CONSULTING ENGINEERS, 550115 1ST HAY SOUTH 0200, FEDERAL HAY, HA 9B005, (425) 415-5144, HAVPLANS EBEEN SUBMITTED TO THE A a�inTe PROJECT NO. 2. SITE PLAN PROVIDED BY CPH CONSULTANTS, TB5 TTH AVENUE, SUITE AOCNCIE9 POR RNICH AND TAL 1422 f 100, KIRKLAND, HA 116055, (425) 05-2590. APPROVAL. UNTI. APPROV2D, B. SOURCE DRANIN66 HERE MODIFIED BY TALA5AEA CONSULTANTS THESE PLANS AM. �A FOR VISUAL ENHANCEMENT, 5LIELJEGT TO R>=VI91GN 1 4. THIS PLAN 15 AN ATTACHMENT TO THE FINAL WETLAND BUFFER g IMPACT AND MITIGATION REPORT PREPARED BY TALA5AEA 8 CONSULTANTS IN JULY 2014, SHEET�OF yQkj aninure eoti - Jv..r. c.w.uw,. I.x. ,ul erM• Mrn.l AS17241217 - arch CS17241217 - eng WETLANDS TOPO EX. CONDITIONS CMA241217 CU5D241217 CUN5241217 CGRD241217 PLANT SCHEDULE TREES WL SIZE AGER MAGROPHYLLUM BI6 LEAF MAPLE FACU AS SHOWN 6 5-6' HT. 551NRA6�� K, WELL BETULA PAPYRIFERA PAPER BIRCH FAG • • GORNUS NUTfALLII PACIFIC DOGWOOD FAGU © FRANSULA (RHAMNU5) GASGARA FAG PUR5HIANA + PSEUDOTSU6A MENZIE511 DOUGLA5 FIR FAGU .�. P5EUDOT5USA MENZIE-511 DOUOLA5 FIR FACU THUJA PLIGATA WESTERN RED CEDAR FAG THUJA PLIGATA WESTERN RED CEDAR FAG T5U6A HETEROPHYLLA WESTERN HEMLOCK FACU j TSU6A HETEROPHYLLA WESTERN HEMLOCK FACU 5MALL TREES d LARGE SHRUBS f AGER GIRGINATUM VINE MAPLE SERVICEBERRY OAMELANGHIER a ALNIFOLIA O CRATAESU5 DOUSLA511 BLACK HAWTHORN HOLODISGUS DISCOLOR OCEAN SPRAY p OEMLERIA INDIAN PLUM Vl GERASIFORMI5 RHODODENDRON PACIFIC O MAGROPHYLLUM RHODODENDRON WL SEC. 29, TWP 21 N, R4E W.M. AS SHOWN 24 5-6' HT. SINGLE�, WELL NCHED AS SHOWN 12 SINGLE TRUNK, WELL 4-5' HT. SET TREE STRAIGHT APLACE AND ON 50LID GROUND BRANCHED OR OR ON COMPACTEDBAGKFILL. AS SHOWN 4 4-5' HT. SINGLE SINGLETRUNK, WELL BRANCHED BALKFILL RANTING HOLE 1/2 HILL A5 SHOWN 3 2-3' HT. 2 GAL., FULL 4 BUSHY WITH NATIVE 501L AND TAMP SOIL TO STABILIZE ROOTBALL. CUT AS SHOWN 26 4-5' HT. BNB, FULL 4 BUSHY AWAY WIRE, STRING, AND BURLAP AND BAOKFILL REMAINING RANTING HOLE. APED BA .KFILL AS SHOWN 16 4-5' HT. 545, FULL 4 BUSHY A5 NOTED IN THE PLANTING SPECIFIGATION5 AND/OR AS SHOWN 10 2-3' HT. 2 6AL., FULL 4 BUSHY INSTALLATION NOTES. AS SHOWN 5 4-5' HT. B4B, FULL 4 BUSHY AS SHOWN 13 2-3' HT. 2 GAL., FULL 4 BUSHY i] 51ZE FACU- AS SHOWN 2Q 4' HT. MULTI -STEM (5 MINJ FACU 510.6. 6 24" HT. MULTILANE 0 MINJ FAG 5' O.G. IT 24" HT. MULTI -CANE (3 MIN) FACU 5' O.G. 36 24" HT. MULTI -CANE (3 MIN) FACU 5' O.G. T9 24" HT. MULTI -CANE (3 MIN) NL 5' O.G. 51 24" HT. FULL 4 BUSHY ��O 5AMB0005 RAGEMOSA RED ELDERBERRY FACU 5' O.G. 3"I 24" HT. MULTI -LANE (3 MIN) { • J 50RBU5 SITCHEN515 51TKA MOUNTAIN ASH NL A5 SHOWN 12 5-6' HT. SSIN�6� K, WELL MA551N6 SHRUBS WL 51ZE SYMBOL SCIENTIFIC NA COMMON NAME STATUS SPACING QTY. (MINJ NOTES CORNUS ALGA 0 (SERICEA) RED -OSIER DOGWOOD FACW 4' O.G. 14 1&" HT, MULTI -CANE (3 MIN) QQ MAHONIA AQUIFOLIUM TALL OREGON &RAPE FACU 4' O.G. 63 16" HT. FULL 4 BUSHY Q ROSA 6YMNOGARPA BALDHIP FZ05E FAGU 4' O.G. 60 IS" HT. MULTILANE (3 MINJ ® ROSA NUTKANA NOOTKA ROSE FAG 3' O.G. 20 I6" HT. MULTI -CANE (3 MINJ QQ RUBUS PARVIFLORUS THIMBLEBERRY FACU W O.G. 95 I&" HT. MULTI -CANE 0 MIN) ® RUBU5 5PEGTABILIS SALMONBERRY FAG 4' O.G. 14 16" HT. MULTI -CANE (3 MIN) 6ROUNDCOVER50 HL SIZE 5Y!?B0L 5G!CNNTIFIG NA'� STATUS SPA�C�INlei QTY_ (MINJ NOTES D &AULTHERIA 5HALLON SHALL FACU 24' O.G. 621 1 GAL. FULL 4 BUSHY .nNDaa POLYSTIGHUM MUNITUM SWORD FERN FACU 56" O.G. 214 1 GAL. FULL 4 BUSHY •GROUNDGOVER SYMBOLS ARE NOT SHOWN ON PLANS. &ROUNDGOVER SPECIES SHALL BE LOCATED IN BETWEEN TREE AND SHRUB GROUPINGS WITHIN BUFFER MITIGATION AREAS A 4 B. IN AREAS LESS THAN 3' WIDE AT THE TOE OF ANY RETAINING WALLS AT BUFFER PERIMETERS (E.6. BUFFER RESTORATION AREAS DSTURBED BY SITE GRADING OR WALL CONSTRUCTION, SEE BUFFER INTRUSION AREAS DEPICTED ON SHEET WI.U, 6ROUNDGOVER5 SHALL BE FIELD LOCATED BY TALA5AEA CONSULTANTS. GENERAL PLANT INSTALLATION NOTES I. PLANT TREES AND/OR SHRUBS I" HIGHER THAN DEPTH GROWN AT NURSERY, 2. FOR CONTAINER TREES AND/OR SHRUBS, SCORE FOUR SIDES OF ROOTBALL PRIOR TO PLANTING. BUTTERFLY ROOTBALL IF ROOT GIRGLIN6 15 EVIDENT. 3. STAKE DErIDUOU5 AND EVERGREEN TREES 4 FEET AND OVER IN HEIGHT WITH ONE 0) STAKE PER TREE, STAKE TREES IWEVIATELY AFTER PLANTING. PLACE STAKE AT THE OUTER EDGE OF THE ROOTS OR ROOTBALL, IN LINE WITH THE PREVAILING WIND. STAKES SHALL. VE LOOSELY ATTACHED L61 N6 CHAIN -LOOK TREE TIES TO ALLOW FOR SOME TWIN MOVEMENT. STAKES TO BE VERTICAL, PARALLEL, V WN-TOPPED, UNSGARRED AND DRIVEN INTO UNDISTURBED SUBGRADE, REMOVE AFTER ONE YEAR. 4, WATER PLANTS IMMEDIATELY UPON PLANTING. THEN PROVIDE MAHJAL WATERING OR A TEMPORARY IRRI6ATI0N SYSTEM TO PREVENT PLANT MORTALITY AND ENSURE PROPER PLANT ESTABLISHMENT. PLANTS SHALL RECEIVE A MINIMUM OF APPROXIMATELY ONE INCH OF WATER EVERY WEEK DURING THE DRY SEASON (GENERALLY .TUNE 15TH - OCTOBER 115TH, OR EARLIER OR LATER IF CONDITIONS WARRANT) FOR THE FIRST SEASON AFTER PLANTING. LR1 OATLON AMOUNTS MAY NEED TO Be INCREASED DURING PROLONGED PERIODS OF HOT, DRY WPATHERI. 5. FERTILIZE ALL TREES AND SHRLe5 WITH A SLOH-REL.EASH GENERAL PURPOSIr GRANULAR FERTILIZER OR SLOW -RELEASE TABLETS AT MANUFACTURERS SPECIFIED RATE. 2 TIME5 ROOTBALL VIA. BNB TREg PLANTIN+S DETAIL. 3 V m I STAKE PER TREE LOCATED OUTSIDE OF ROOTBALL. FASTEN VY GHAINLOCK TIES. LOOP EAOH TIE AROUND TREE LOOSELY TO PROVIDE I' 5L4CK FOR TRUNK 6ROWTH. STAKE HEIGHT MST BE AT LEAST 4' ABOVE FINISHED GRADE. LD MILGH TREE WITH MULCH RING 0 3' DEEP x W DIA TO WITHIN B' OF THE TRUNK - DO NOT MOIAD N �u MULCH AGAINST TFZlJW FO+Is TEM-ORARY 5' HIGH SOIL DAFT AROLM rl TO HOLD WATER p Z r— FINISHED GRADE HOLE 2 HAS 0000 DRMNABE. N Rveaurce d Evvlevnmentel PlevnlnL P SET RANT STRAIGHT AND PLACE z ROOTBALL ON SOLID GROUND OR p ON COHRAGTND BAC 0-ILL z 1� �v V2 FULL P550LL 4 !2 MW NATIVE E TAMP TO Z 3 5TAB402E RCMBALLr DO 147r DISTURB ROOTCN1e ISAG.P" yt mf1m 8 DINS3DO NOT PILE HIGH AGAINST 4 IM91ANNIN9 PLL1tNHG HOLE 4 ANEN✓V J¢ j Sr@f O G AAN IO�R PWWr IINPER STAUATID�N NOTES a Z z O W Y i FED T IH- FINISHED BRACE P4F ♦ 50ARIFY SIDES OF PLANING ¢ O LE, S�6e HOLE HAS HOLE, cm Z CAKE ad t' Ex15nv5 Nun+r>r SpII, � fn i 3 �IFl J 2 riT'DI 7 MEETEERALL L LL Lu CONTAINER STOCK P NTI N6 DETA P o o W U Y = Z U 3 � 3 Y DEVCO, INC. �wNtY cuun� WOO Meln Street, Sulle 301 BELLEVUE, WA 98004 PHONE: (425)453.9551 g CALL eeFoee im oto mwyou 7�OW5:4-Bees C H CONSULTANTS SN Fnn N-the Rmmdrd lad LM lbrtvl" - K" Nlmpwt ,u MAnA We IGOI MolYr4 Mn F10i1 Rn.c IINI tdlao I rAc last u61+A NOTES • onvon mLm.." m CITY OF FEDERAL WAY I. SURVEY PROVIDED BY IESM CONSULTING ENSINEER5, 359I5 1ST WAY SOUTH 0200, FEDERAL WAY, WA g6003, (425) 4154144. APPROVED FOR CONSTRUCTION pROJECTNO, 2. 517E PLAN PROVIDED BY GPH CONSULTANTS, 155 TTH AVENUE, SUITE TAIL 1422 100, KIRKLAND, WA 0053, (425) 265-25g0, DRAWM I,, 5. SOURCE DRAWIN65 HERE MODIFIED BY TALASAEA CONSULTANTS BY; DATE; FOR VISUAL ENHANCEMENT, drl W RTONL VAY, DU RIIENTOFAA140I0 A5.O 4. THI5 PLAN 15 AN ATTACHMENT TO THE FINAL WETLAND ]SUPPER p1. IMPACT AND MITIGATION REPORT PREPARED BY TALA5AEA CONSULTANTS IN JULY 2014. SHEET _LOF-� 47r...,.ala edN" - nln.n.n cw,."unnu, m", nu R�nu R.nmrv.a, ASIT241217 - arch CSI7241217 - eng ft-MUNDS TOPO EX. COND177ONS CSLA241217 CUS0241217 CUWS241217 CCRD241217 PLANTING SPEGIFIGATIONS PART I. GENERAL 1.1 SUBMITTALS A. PRODUCT DATA, FURNI5H THE FOLLOWING WITH EACH PLANT MATERIAL DELIVERY, 1. INVOICES INDICATING SIZES AND VARIETY OF PLANT MATERIAL. 2 CERTIFICATES OF I1,151 REQUIRED BY STATE AND FEDERAL AGENCIES. B. QUALITY LO�'1irAL. I. PRIOR TO DELIVERY OF MATERIALS, CERTIFICATES OF COMPLIANCE ATTESTING THAT MATERIALS MEET THE SPECIFIED REGIREMENTS SHALL BE FURNISHED FOR THE FOLLOWING, PLANTS, TOPSOIL, FERTILIZER AND ORISANIG MULCH. CERTIFIED COPIES OF THE MATERIAL CERTIFICATES SHALL INCLUDE THE FOLLOWING, a. PLANT MATERIALS, BOTANICAL NAME, COMMON NAME, SIZE, QUANTITY BY SPECIES, AND LOCATION WERE GROWN. b.IMPORTED TOPSOIL, PARTICLE SIZE, PH, ORGANIC MATTER CONTENT, TEXTURAL GLASS, SOLUBLE SALTS, CHEMICAL AND MECHANICAL ANALYSES. a. FERTILIZER, CHEMICAL ANALYSIS AHD PERCENT COMPOSITION. &IMPORTED MULCH, COMPOSITION AND SOURCE. ID REFERENCES A. SIZE A Ea1..71HG 5YA4DARD5• SHALL CONFORM TO THE CURRENT EDITION OF THE AMERICAN STANDARD FOR NURSERY STOCK, PUBLISHED BY THE AMERICAN NURSERY AND LANDSCAPE ASSOCIATION. 1.4 QUALITY ASSURANCE AC,,5 tr1ALIFIGATHd-G_ THE PERSONS PERFORMING THE RANTING AND THEIR SUPERVISOR('.) SHALL BE PERSONALLY EXPERIENCED WITH PLANTING AND GARIN6 FOR PLANT MATERIAL. AND SHALL HAVE SEEN RE6lILAALY EMPLOYED BY A COMPANY e<,4 D IN PANTING AND GAPING FOR PLANT MATERIAL FOR A MINIMUM OF 2 YEARS. B. PLANT MATERIAL, ALL RANT MATERIALS SHALL BE LOCALLY GROWN OR REGIONALLY ACCLIMATIZED TO THE PACIFIC NORTHWEST. 15 DELIVERY, INSPECTION, STORAGE AND HANDLING A. DELIVERY, A DELIVERY 50HEMIL E SHALL BE PROVIDED AT LEAST 10 CALENDAR DAYS PRIOR TO THE FIRST DAY OF DELIVERY. PLANT MATERIALS SHALL BE DELIVERED TO THE JOB SITE NOT MORE THAN T WORKING DAYS PRIOR TO THEIR RESPECTIVE RANTING DATES. B. PROTECTION VERFN5 DEL1VE4Y, PLANT MATERIAL SHALL BE PROTECTED DURING, DELIVERY TO PREVENT DESICCATION AND DAMAGE TO THE BRANCHES, TRUK ROOT SYSTEM, OR EARTH BALL. BRANCHES SHALL BE PROTECTED BY TYING -IN. EXPOSED BRANCHES SHALL BE COVERED DURING TRANSPORT. G. FERTILIZERL FERTILIZER SHALL BE DELIVERED IN MANUFACTURERS STANDARD SIZED BAPS SHOWING WEIGHT, ANALYSIS, AND MANUFACTURERS NAME. STORE UNDER A WATERPROOF COVER OR IN A DRY PLACE AS DE516RATED BY THE OWNERS REPRESENTATIVE. D. INSPECTION, ALL PLANT MATEWAL5 SHALL BE INSPECTED UPON ARRIVAL AT THE JOB SITE BY THE OWNERS REPRESENTATIVE FOR CONFORMITY TO TYPE AND QUANTITY NTH REGARD TO THEIR RESP5'TIVE SPECIFICATIONS. E. MULCH,. A MULCH SAMPLE SHALL BE INSPECTED BY TALASAEA CONSULTANTS PRIOR TO THE MULCH BEING DELIVERED TO THE SITE. F. STORAGE 1. PLANT MATERIAL NOT INSTALLED ON THE DAY OF ARRIVAL AT THE SITE SHALL BE STORED AND PROTECTED IN DESIGNATED AREAS. PLANTS STORED ON THE PROJECT SITE SHALL BE PROTECTED FROM EXTREME WEATHER CONDITIONS BY INSULATING THE ROOTS, ROOT BALLS OR CONTAINERS NTH SAWDUST, SOIL, COMPOST. BARK OR WOODCHIP5, PANT MATERIAL SHALL Be PROTSCTED FROM DIRECT EXPOSURE TO WIND AW 5U. BARE -ROOT PLANT MATERIAL STALL BE HEELED -IN. CUTTINGS AND EMERGENT PANTS MUST BE PROTECTED FROM DRYING AT ALL TIMES AND SHALL BE HEELED -IN WITH MOIST SOIL OR OTHER IN 5UATING MATERIAL, ALL PANT MATERIAL STORED ON-51TE SHALL BE WATER® DAILY UNTIL INSTALLED. 2. STORAGE OF OTHER MATERIALS SHALL BE IN DESIGNATED AREAi 1.6 SCHEDULING A, PLANTING SEASON, INSTALL WOODY RANTS BETWEEN OCTOBER I AND FEBRUARY 15 WHENEVER THE TEMPERATURE 15 ABOVE 52 DEGREES F AND THE SOIL 15 IN A WORKABLE CONDITION, UNL.ESG OTHERWISE APPROVED IN WRITING. CUTTINGS SHALL ONLY BE USED IF PLANTING OCCURS BETWEEN DEGBMBER IST AND APRIL IST. B. ELli ;HI5TA,LLA11ON, EXCEPT FOR CONTAINER-6ROWN PLANT MATERIAL, THE MAXIMUM TIME BETWEEN THE DIGGING AND INSTALLATION OF PLANT MATERIAL SHALL BE 21 DAYS. THE MAXIMUM TIME BETWEEN PLANT INSTALLATION AND MULCH PLACEMENT SHALL BE 12 Haft. 13 WARRANTY A. WAARANr+' PERIOD, THE CONIRACTOR-PROVOW WJ:FANTY SHALL EXTEND FOR A PERIOD OF ONE YEAR FROM TIE DATE OF PHYSHGAL COMPLETION. PHYSICAL COMPLETION FOR THE WORK OF THIS SECTION 15 THE DATE WHEN ALL CLEARING/GRa6BIN6, PLANING, IRRIGATION, AND RELATED WORK HAS BEEN COMPLETED AND 15 ACCEPTED BY THE OWNERS REPRESENTATIVE, TALASAEA CONSULTANTS, AND APPLICABLE AGENCIES. B. b&8R6N CONTRACTORS WARRANTY SHALL INCLUDE REPLACEMENT OF PLAxi Me TO MORTALITY (SANE SIZE AND SPECIES ° 011 ON THE DRAWINGS). PLANTS REPLACED IBDER THIS WARRANTY SHALL BE WARRANTED FOR AN ADDITIONAL YEAR AFTER REPLACEMENT. G. DONS, L055 DUE TO EXCE951VELY SEVERE CLIMATOLOGICAL CONDITIONS (SUBSTANTIATED BY 10-YEAR RECORDED WEATHER CHARTS), OR GASES OF NEGLECT B/ ONER OR CASES OF ABU5EMAMA9E BY OTHERS. PART 2, PRODUCTS AND MATERIALS 2.1 PLANTS A. 0=6LL ALL PLANT MATERIAL WILL CONFORM TO THE VARIETIES SPECIFIED OR SHOWN IN THE PLANT LIST('.) INDICATED ON THE MITIGATION PLANS AND BE TRUE TO BOTANICAL NAME AS LISTED IN, HITCHGOGK, CL., AND A CRONMAST. 1I T9. FLORA OF THE PACIFIC NORTHWEST, UNIVERSITY OF WASHINGTON B. SI-I,:L95 hhP TRFT_4. I. TALASAEA SHALL EXAMINE PLANT MATERIAL PRIOR TO PLANTING. ANY MATERIAL NOT MEETING THE REQUIRED SPECIFICATIONS SHALL BE IMMEDIATELY REMOVED FROM THE 517E AND REPLACED WITH LIKE MATERIAL THAT MEETS THE REQUIRED STANDARDS. PLANT MATERIAL SHALL MEET THE REQUIREMENTS OF STATE AND FEDERAL LAYS WITH RESPECT TO PLANT DISEASE AND INFESTATIONS. INSPECTION CERTIFICATES, REQUIRED BY LAWN SHALL ACCOMPANY EACH AND EVERY SHIPMIENT AND SHALL BE SUBMITTED TO TALASAEA UPON CONTRACTORS RECEIPT OP PLANT MATERIAL, 2. PLANT MATERIALS SHALL 13E LOCALLY GROWN (WESTERN WAIHINGTON, WESTERN ORIECOK OR WE5TIB*1 IBC), H[ALTHTY, BUSHY, IN vtwil GRO),DNi5 COH mOK AND &,MRAVTE39D TO BE TRITE TO SIZE, NAME, AND VARIETY. IF RER AGENT OF PLANT MATERIAL 15 NECESSARY DUE TO CONSTRUCTION DAMAGE OR PLANT FAILURE WITHIN ONE YEAR OP INSTALLATION, THE 51ZE5, 5PBCIES, AND WANTITIES SHALL BE EQUAL TO SPECIFIED PLANTS, A5 INDICATED ON THE PLANS. S. PLANTS SHALL BE NURSERY GROWN, WELL -ROOTED, OF NORMAL GROWTH AND CHART T1:1R AIq f4RE=_ FROM DISEASE OR INPE'STATION, TAU5AEA CONSULTANTS RE5CRVES Tem RIGHT TO REWIRE REPLACEMENT OR SUBSTITUTION OF ANY PLANTS DEEMED UNSUITABLE. 4. TREES SHALL HAVE UNIFORM BRANCHING, SINGLE STRAIGHT TRUNKS WILESS 5PECIPIED A5 MULTI -STEM, MULTITCAE, OR MULTI -TRUNK), AND AN INTACT AND UDAMAGED CENTRAL LEADER CONTAINER STOCK SHALL HAVE BEEN BROWN IN A SEC. 29, TWP 21 N, R4E W.M. CONTAINER FOR AT LEAST ONE FULL GROWING SEASON AND SHALL HAVE A WFJJ_ DEVELOPED ROOT SYSTEM. PLANT MATERIAL THAT 15 ROOT -BOUND OR HAS DAMAGED ROOT ZONES OR BROKEN ROOT BALLS WILL NOT BE ACCEPTED. 5. CONIFEROUS TREES SHALL BE NURSERY GROWN, FULL AND BUSHY, WITH UNIFORM BRANCHING AND A NATURAL, NON -SHEARED FORM. ORIGINAL CENTRAL LEADER MUST BE HEALTHY AND UNDAMAGED. MAXIMUM GAP BETWEEN BRANCHING 54ALL NOT EXCEED 9 INCHES, AND LENGTH OF TOP LEADER SHALL NOT EXCEED 12 INCHES. 6. SIRdIBG SHALL HAVE A MINIMUM OF THREE STEMS AND SHALL BE A MINIMUM HEIGHT OF IS INCHES. T, TREES AND SHRUBS SHALL HAVE DEVELOPED ROOT AND BRANCH SYSTEMS. DO NOT PRUNE BRANi BEFORE DELIVERY. b. NATIVE PLANT CUTTINGS SHALL BE GROWN AND GOLLEGTED IN THE MARITIME PACIFIC NORTHWEST. CUTTINGS SHALL BE OF ONE TO TWO-YEAR-OLO WOOD, b INCH DIAMETER MINIMUM. CIJTTIN95 SHALL BE A MINIMUM OF 4 FEET IN LENGTH WITH 4 LATERAL BIAS EXPOSED ABOVE GROUND AFTER PLANTING. THE TOP OF EACH GUTTING SHALL BE A MINIMUM OF I INCH ABOVE A LEAF BUD, THE BOTTOM CUT 2 INCHES BELOW A BID. THE BASAL EPOS OF THE CtrMN65 SHALL BE GUT AT A 45 DEGREE ANGLE AND MARKED CLEARLY 50 THAT THE ROOTING ENV 15 PLANTED IN THE SOIL CUTTINGS MUST BE KEPT COVERED AND MOIST DURING STORAGE AND TRANSPORT, AND NO CUTTINGS SHALL BE STORED MORE THAN TREE DAYS FROM DATE OF CtrMNS. CURING'. SHALL ONLY BE USED IF PLANTING OCCURS BETWEEN DECEMBER IST AND APRIL 15T. FOR PLA NTIN6 BETWEEN APRIL 15T AND DECEMBER IST, CONTAINER PLANTS SHALL BE USED, 9. PLANTS SHALL BE fiRff OF SPLITS AND CHECKS, BARK ABRASIONS, AND DISFI6URIN6 KNOTS. IOPCR DECIDUOUS PLANTS, BIDS SHALL BE INTACT AND REASONABLY CLOSED AT TIME OF PLANTING, IF DORMANT. II. BALLED AND BURLAPPED PLANTS SHALL HOLD A NATURAL BALL. MANUFACTURED ROOT BALLS ARE UNACCEPTABLE. 12.PANTS SHALL CONFORM TO SIZES INDICATED ON THE PLANT SCHEDULE. RANTS MAY BE LARGER THAN THE MINIMUM SIZES 5PEGIFIED. G. NOXIOUS SPECIES, ALL PLANT STOCK AND OTHER REWESETATION MATERIALS SHALL BE FREE FROM THE OR OTHER PANT COMPONENTS OF ANY NOXIOUS OR INVA5IVE SPECIES, AS IDENTIFIED BY THE KING COUNTY NOXIOUS HEED CONTROL BOARD. D. SUBSTITUTIONS, SUBSTITUTIONS WILL NOT BE PERMITTED WITHOUT A WRITTEN REQUEST AND APPROVAL FROM THE OWNERS REPRESENTATIVE, TALASAEA CONSULTANTS, AND APPLICABLE AGENCIES. 2.2 PLANTING SOIL A. TOPSOIL, IF SUITABLE STOCKPILED NATIVE TOPSOIL 15 NOT AVAILABLE FOR MITIGATION PLANTINGS, TOPSOIL SHALL BE OBTAINED FROM OUTSIDE 501 STOCKPILED OR IMPORTED TOPSOIL SHALL BE FERTILE, FRIABLE, SANDY LOAM SURFACE SOIL, FREE OF SUBSOIL, CLAY LUMPS, BRUSH, NEEDS, ROOTS, STUMPS, STORES LARGER THAN I INCH IN ANY DIMENSION, LITTER, OR ANY OTHER EXTRANEOUS OR TOXIC MATTER HARMFUL TO PLANT GROWTH. B. ORSAi CONItIENTL IMPORTED TOPSOIL SHALL CONSIST OF ORGANIC MATERIALS AMBVED AS NECESSARY TO PRODUCE A BULK ORGANIC CONTENT OF AT LEAST 10 PERCENT AND NOT GREATER THAN 20 PERCENT, A5 DETERMINED BY AASHTO-T-194. G. COMPOST, COMPOST SHALL MfffT THE DEFINITION FOR COMPOSTED MATERIALS AS DEFINED BY THE WASHINGTON STATE DEPARTMENT OF ECOLOGY. D. SOIL AN/E+rMlEN19, WOODY PLANTINGS SHALL BE FERTILIZED NTH A SLOW -RELEASE GENERAL GRANULAR FERTILIZER (Ib-Ib-Ib), WITH APPLICATION RATE'S AS SPECIFIED BY MANUFACTURER FERTILIZER SHALL BE APPLIED AFTER PLANTING PIT 15 BACKFILLED, AND PRIOR TO APPLICATION OF MULCH. FERTILIZER SHALL NOT BE APPLIED 51 NOVEMBER AND MARCH. 23 MULCH A. BARK OR WOODCHIP MULCH SHALL BE DERIVED FROM DOUGLA5 FIR, PINE OR HEMLOCK SPECIES. THE MULCH SHALL NOT CONTAIN RESIN, TANNIN OR OTHER COMPOUNDS IN QUANTITIES THAT WOULD BE DETRIMENTAL TO ANIMAL, PLANT LIFE OR WATER QUALITY. B. MULCH SHALL BE GROUND SO THAT A MINIMUM OF R5% OF THE MATERIAL WILL PASS THROUGH A IS -INCH SIEVE AND NOT MORE THAT 55%, BY LOOSE VOLUME, WILL Pi THROUGH A US NO. 4 SIEVE. 2.4 MISCELLANEOUS MATERIALS A. STAKES CF°ADMETi AID Ci STAKES, SOUR, DURABLE, WESTERN RED CEDAR OR OTHER APPROVED WOOD, FREE OF IN5EGT OR FUNGUS INFESTATION. B. cAw,4-LOCK TREE TES, YrINCH WIDE, PLASTIC. PART 3, EXECUTION 3.1 SOIL PREPARATION A. PLAMTHG AREA CONDITIONS, CONTRACTOR SHALL VERIFY THAT PLANT INSTALLATION CONDITIONS ARE SUITABLE WITHIN THE PROJFxT AREA('.). ANY UNSATISFACTORY CONDITIONS SHALL BE CORRECTED PRIOR TO START OF WORK. WHEN CONDITIONS DETRIMENTAL TO PLANT GROWTH ARE ENCOUNTERED, SUCH AS RABBLE FILL, POOR DRAINAGE, COMPACTED SOILS, SIGNIFICANT EX15TIN5 OR INVASIVE VEGETATION, OR OTHER OBSTRUCTIONS, CONTRACTOR SHALL NOTIFY TALASAEA CONSULTANTS PRIOR TO PLANTING. THE BEGINNING OF WORK BY THE CONTRACTOR C4MTIIUTE5 ACCEPTANCE OF C40NDITlM A6 SATISFACTORY. B. PLANTING SOIL, IN ALL 6RLAD-X''/CLEARE715R-E-IOEn PROJECT AREAS, 9 INCHES OF STOCKPILED OR IMPORTED TOPSOIL SHALL BE PEALED OVER WEISRADE, OR EXISTING SOILS SHALL BE AMENDED WITH COMPOST TO CREATE THE EQUIVALENT OF A 9-INCH DEPTH OF TOPSOIL. G. PLAHTNS IN saAnEv/1_FhA=o/6RNjiggp ALAS, PLANTS SHALL BE INSTALLED IN NEWLY PLACED OR AMENDED TOPSOIL. D. SOIL DErIIMPAr nON15T.AMrICATiON. SOILS IN WADEDMISTURBED AREAS THAT 'ARE COMPACTED AND UNSUITABLE FOR PROPER PLANT GROWTH SHALL BE DECOMPACTED AHD/OR SCARIFIED TO A MINIMUM DEPTH OF 6A PRIOR TO TOPSOIL INSTALLATION 32 PLANTING A. PLANT LAYOUT, PROP05M LOCATIONS OF TREES AND 5HRUB5 SHALL BE STAKED AND IDENTIFIED NTH AN APPROVED CODING SYSTEM OR BY PLACEMENT OF THE ACTUAL PLANT MATERIAL. FOR LARGE GROUPINGS OF A SINGLE SPECIES OF SHRUB, LANDSCAPE CONTRACTOR MAY STAKE THE PLANTING BOUNDARIES. B. '12BjfhN L.YCUT A�AITJIL FPOM ThLJeS%EA G?45LLTAN65U�'S+ TA EXLAYATCN OF PLANTING PITS, C.-L" L,G _PIED%F'EN;FIONS I. PIT DEPTH NOT TO EXCEED THE ROOT BALL OR CONTAINER DEPTH. 2. PIT WIDTH, MEASURED AT THE GROUND SURFACE, 2 TIMES THE WIDTH OF THE ROOT BALL OR CONTAINS; AS INDICATED IN TYPICAL PANTING DETAILS. a.BARE-ROOT PANTS, DIAMETER EQUAL TO THE WIDTH OF THE ROOT SPREAD. D. SETTING PLANTS, I. BALLED PLANTS, GET PLANTS IN POSITION AND BACKFILL 1/2 DEPTH OF BALL, COMPLETELY REMOVE GAGE AND TWINE FROM PLANT AND FULL BURLAP DOWN AS PAR AS POSSIBLE. COMPLETE BAGOILL AND SETTLE NTH WATER ROOT COLLAR SHALL REMAIN I INCH ABOVE ADJACENT GRADE. 2. BARE -ROOT PLANTS, FILM BPLISED OR BROKEN ROOTS. SET PLANT IN POSITION AND PALE METLAND PLANTING SOIL AROUND ROOTS. USE CARE TO AVOID BRUISING OR BREAKING ROOTS WHEN FIRMING SOIL. SETTLE NTH WATER. S. SHIP B/TREE PLANTING, SHRUB AND TREES STOCK SHALL. BE PLANTED IN HND-WG HOLES ACCORDING TO PANTING DETAILS SHOWN ON THE MITIGATION PANS. SHRUB AND TREE ROOT BATS SHALL BE SET 90 THAT ROOT COLLARS ARE I INCH ABOVE ADJACENT GRADE. ALL BAC47ILL SHALL BE & MI.Y TAMPED IN PLACE. 4. SURFACE FINISH, FORM A GAUGER AS INDICATED ON TYPICAL FLANTIN6 DETAILS, OR AS DIRECTED. GRADE SOIL TO FORM A BASIN ON THE LOWER SIDE OF SLOPE PLANTINGS TO CATCH AND RETAIN WATER 5. IN FORESTED AREAS, CONTRACTOR SHALL LOOSEN TIE A 2 FOOT PIECE OF BIODEGRADABLE FASSINS TO THE TOP PORTION OF ALL PLANTED VEGETATION TO FACILITATE POST -CONSTRUCTION PERFORMANCE AND MAINTENANCE REVIEW BY TALASAEA CONSULTANTS AND REGULATORY AGENCIES. 6. ACTUAL PLANT SYMBOL QUANTITIES SHOWN ON THE PLANS SHALL PREVAIL OVER GDANTITIES SHOWN ON THE PLANT SCHEDULE IN THE EVENT OF A 0I50REPAWY. E. MULCHING, I. 6RADED/GLEARED/6RUB5ED BUFFER AREAS, SHALL BE MULCHED AFTER TOPSOIL INSTALLATION AND PRIOR TO PANT INSTALLATION NTH A 3-INGH LAYER OF MEDIUM BARK MULCH. 2. NON -GRADED BUFFER AREAS, PROVIDE A 36-INCH DIAMETER, 31NGH DEEP MACH RING AROUND THE BASE OF EACH TREE, AND A 24-INCH DIAMETER 5-INGH DEEP MULCH RING, AROUND THE BASE OF EACH SHRUB. 3. WATER PLANTS TH OROUSHLY AFTER MULCHING. F. PRUNING, PRUNE IMMEDIATELY AFTER PLANTING ONLY AS DIRECTED BY TALASAEA CONSULTANTS. G. TREE STAKES AND TIES, STAKE DECIDUOUS AND EVERGREEN TREES 4 FEET OR OVER IN HEIGHT WITH ONE 00 STAKE PER TREE. STAKE TREES IMMEDIATELY AFTER PLANTING. PAGE STAKE AT THE OUTER E96E OF THE ROOTS OR BALL, IN LINE WITH THE PREVAILING WIND, AND AT A 10 DEGREE ANGLE FROM THE TREE TRUNK. LOOSELY ATTACH STAKE TO TREE U6I1,16 CHAINTI.00K TES, TREE SHOULD BE ABLE TO Si H. F AEii ALL NEW PLANTS SHALL BE MARKED WITH A PIECE OF COLORED SURVEYORS FLAGGING TO FACILITATE IDENTIFICATION FOR FUTURE MONITORING. FAGGING SHALL BE TED TO THE TOP OF EACH PLANT. I, I. CONTRACTOR SHALL PROVIDE AN ABOVE-6RO1RD TEMPORARY IRRIGATION SYSTEM CAPABLE OF FILL HEAD -TO -HEAD COVERAGE OF ALL CLEARED 4 GRUBBED PLANTED PROJECT AREAS. THE TEMPORARY IRRI6ATON SYSTEM SHALL EITHER UTILIZE CONTROLLER AND POINT OF CONNECTION (PDC) FROM THE 517E IRRIGATION SYSTEM OR SHALL INCLUDE A SEPARATE POC. AND CONTROLLER NTH A BALKFLOW PREVENTION DEVICE PER WATER JXRISDIGTON INSPECTION AND APPROVAL. THE SYSTEM SHALL BE ZONED TO PROVIDE OPTIMAL PRESSURE AND UNIFORMITY OF COVERAGE, AS WELL AS SEPARATION BETWEEN AREAS OF FULL SUN AND 51 AND FOR SLOPES IN EXCESS OF 5 PERCENT. 2. 5YST:M L7 Si ANQ MATERIALS- HEGTRONIG VALVES SHALL BE THE SAME MANUFACTURER AS THOSE USED FOR THE SITE IRRIGATION SYSTEM, OR SHALL BE RAIN BIRD PEE SERIES OR EQUAL IF SYSTEM 15 NOT CIDW16UOIS WITH THE 517E SYSTEM. VALVES SHALL BE 51ZED TO ACCOMMODATE PRESSURE AND ZONE CONSUMPTION REGUIREME NT5 OF THE SYSTEM AND SHALL BE INSTALLED BELOW GRADE IN GAR50N (OR E',xUAL) VALVE BOXES. HIRING SHALL BE INSULATED MULTI -STRAND, TAPED TO THE MAIN AT 61 INTERVALS WITH DUCT TAPE WRAPS. ONfiRADE MAIN AND LATERAL LINES SHALL BE GLASS 200 PVG BELL PIPE WITH SOLVENT WELDED FITTINGS, SECURED IN-♦'LAGE WITH WIRE STAPES WHERE NECESSARY ON SLOPED AREAS. LINES SHALL BE PLACED 12 INCHES BELOW GRADE IN 4 INCH PCV SLEEVES WHERE VEHICULAR OR MAINTENANCE ACCESS 15 NEEDED ACRO56 LINES TO THE PROJECT AREA S). MAXIMUM MAIN LINE SIZE SHALL BE Ih IWAES AND MAY BE LOOPED BACK TO THE POC, TO REDUCE PRESSURE LOSS. LATERAL LIMES SHALL BE SIZED IN DECREASING DOWNSTREAM ORDER PER RAIN BIRD DESIGN STANDARDS, THE MINIMUM LATERAL 51ZE SHALL BE % INCH. HEADS SHALL BE ROTOR OR IMPACT TYPE INSTALLED 4 FEET ABOVE FINISHED GRADE ON 2-INGH DIAMETER WOOD TREE STAKES. STAKES SHALL BE SECURE IN THE 6ROUND, EMBEDDED TO A MINIMUM DEPTH OF 24 INCHES. HEADS AND % INCH PVC RI5E5t5 SHALL BE SECURED TO STAKES WITH CONSTRICTING HOSE CLAMPS, NO FANNY PIPE SHALL BE USED. HEADS AND NOZZLES SHALL PROVIDE MATCHED PRECIPITATION RATED FOR EACH ZONE. B. PROGRP,WMIHL9• IRRIGATION SYSTEM SHALL BE PROGRAMMED TO PROVIDE APPROXIMATELY I/2 INCH OF WATER EVERY THREE DAYS DURING THE DRY SEASON (APPROXIMATELY AM 15TH TO OCTOBER 151 IRRIGATION AMOUNTS IN ZONES LOCATED IN THE 51 OR ON STEEP SLOPES MAY EVE REDUCED IF APPROVED BY TALASAEA CONSULTANTS OR THE PROJECT ECOL0615T/BIOL0615T. 4. WATER AHD PRTi Ei FOR 4YS :e- THE OWNER SHALL PROVIDE PLATER AND ELECTRICITY FOR THE SYSTEM. 5. AS -BUILT DRAWING, A CHART DESCRIBING THE LOCATION OF ALL INSTALLED OR OPEN ZONE. CORRESPONDING CONTROLLER NUMBERS SHALL BE PROVIDED BY THE CONTRACTOR AND PLACED IN51DE THE CONTROLLER AND GIVEN TO THE OH ERS REPRESENTATIVE. 6. WARRANTY, THE IRRIGATION SYSTEM SHALL INCLUDE A ONE-YEAR WARRANTY AGAINST DEFECTS IN MATERIALS AND WORKMANSHIP FROM THE DATE OF FINAL PROJECT ACCEPTANCE. THE WARRANTY S}Wl INCLUDE SYSTEM ACTIVATION AND WINTERIZATION FOR THE FIRST YEAR AND IMMEDIATE REPAIR OF THE SYSTEM IF IT IS OBSERVED TO BE MALFUNCTIONING. J. {eNSiAk& AREA§ FENCE &R 5161ii5, INSTALL CRITICAL AREAS FENCE AND CRITICAL AREAS 51" WHERE SHOWN ON PLANS PER INSTALLATION DETAILS PROVIDED ON PLANS. IC REETOR. EJh5;jl HW, MTFRAL OR I AHD51APED AREAS I. EXISTING NATURAL OR LANDSCAPED AREAS THAT ARE DAMAGED DURING CONSTRUCTION SHALL BE RESTORED TO THEIR ORIGINAL CONDITION, UNLESS It4PROVEFENF OR MODIFICATIONS ARE SPECIFIED POR THOSE AREAS. 2. CONTRACTOR SHALL EXERCISE CARE TO PREVENT INLU2Y TO THE TRUNK, ROOTS, OR BRANCHES OF ANY TREES OR SHRUBS THAT ARE TO REMAIN. ANY LIVING, WOODY PLANT THAT IS DAMAGED DURING CONSTRUCTION SHALL BE TREATED WITHIN 24 HOURS OF OCCURRENCE, AND TALASAEA CONSULTANTS SMALL BE NOTIFIED IMMEDIATELY OF THE INCIDENT. DAMAGE TREATMENT SHALL INCLUDE EVENLY GUTTING BROKEN BRANCHES, BROKEN ROOTS, AND DAMAGED TREE BARK, WIRED RANTS SHALL BE THOROUGHLY WATERED AND ADDITIONAL MEASIIGF4 SHALL BE TAKEN, AS APPROPRIATE, TO AID IN PLANT SURVIVAL, L. THE WNTRAi SHALL NOTIFY TALaAS.AFA C*N7G,YANT5 IN WRITING AT I.PAST TEN DAYS PRIOR TO YW MWIESTED DATE OF A PRO.EGT COMPLETION INSPECTION. IF ITEMS ARE TO BE CORRECTED, A PUNCH L15T SHALL BE PREPARED BY TALP5AEA CONSULTANTS Aim 9051 TO THE CONTRACTOR FOR COMPLETION. AFTER PUNCH LIST ITEMS HAVE BEEN COMPLETED, TALASAEA CONSO.TANTS SHALL REVIEW THE PROJECT AGAIN FOR FINAL ACCEPTANCE OF PLAN IMPEMENTATIOK IF PUNGH LIST ITEMS REWIRE PLANT REPLACEMENT, AND THE LHLSPWPON OCCURS OUTSIDE OF A SUITABLE PLANTING SEASON, PL.AN75 SHALL BE REPLACED MI IW9 THE NEXT RANTIN S 5CAEi M. AS43UII T PLAN, CONTRACTOR 19 RESPONSIBLE FOR VERIFYING PLANT LOCATIONS AND QUANTITIES ON THE PLANT SCHEDULE WITH THOSE REPRESENTED AS SYMBOLS ON THE MITIGATION PLANS. CONTRACTOR SHALL KELP A COMPLETE GET OF PRINTS AT THE JOB SITE DURING CONSTRUCTION FOR THE FIAZP05E OF RECORDING IN-THE-FIFI CHANGES OR MODIFICATIONS TO THE APPROVED PANS, THIS INFORMATION SHALL BE UPDATED ON A DAILY BA519 A5 NECESSARY, PART 4. ONE YEAR CONTRACTOR WARRANTY A REYI.=.4N OF MAINTERAAY.E REWREEItM5• CONTRACTOR 51 REVIEW LANDSCAPE MAINTENANCE REGOMPEN DATION5 WITH A GJALIFIED WETLAND BIOLOGIST FROM TALASAEA COUS.LTANT5 WHO 15 FAMILIAR NTH THE STATED GOALS AND 05.ECTVES OF THE PROJECT RAN, 5. CONTRACTOR SHALL MAINTAIN TREES AND SHRUBS FOR A PERIOD OF ONE YEAR FROM THE DATE OF FINAL ACCEPTANCE IN ORDER TO MAINTAIN HEALTHYGROWTH AND HABITAT DIVERSITY. MAINTENANCE ACTIVITIES SHALL INr_LLUIPE. BUT ARE HY T LIMITED TO, f/i REQLA4N4y PLANTS Ote TO MORTALITY. NB) TIG� AID REPAMRINg TREE 5TAKIES, W RESEYI'IN6 PLANTS TO PROPER GRAVES AND UPRIGHT POSITIONS, AID (D) CORRELTINA5 DRAINAGE PRGBi AS FTXVFFD, C. IRRIGATION, I. SYSTEM M614TENAHiE AID RJ�ANR THE CONTRACTOR SHALL BERESPONSIBLE FOR ACTIVATING, NMERIZIN6, MAINTAINING, AND CONTINUALLY VERIFYING THE ADEWATE OPERATION OF THE TEMPORARY IRRIGATION SYSTEM FOR THE FIRST GROWING SEASON FOLLOWING INSTALLATION SYSTEM FUNCTION (INCLUDING ELECTRONIC VALVE AND CONTROLLER RNGTIOW SHALL BE INSPECTED FOR OPERATION AND FILL COVERAGE OF ALL PANTED AREAS DURING EACH MAINTENANCE V151T. THE SYSTEM SHALL BE REPAIRED IMMEDIATELY IF FOUND TO BE DAMAGED OR MALE NGTIONIN6. SYSTEM SFW1 BE PROGRAMMED AND MAINTAINED TO PROVIDE APPROXIMATELY Y. INCH OF WATER EVERY THREE DAYS. D. STATE AND T1E REMOVAL, CONTRACTOR SHALL REMOVE TREE STAKES AND TIES ONE YEAR AFTER INSTALLATION, UNLESS RECEIVING WITTEN PERMISSION FROM TALASAEA CONSULTANTS TO DELAY REMOVAL OF STAKES AND TES E. CONTRACTOR SHALL CORRECT EROSION AND DRAINAGE PROBLEMS AS REWIRED. F, 1RZini N 5n= RUiZeAL, CONTRACTOR SHALL R04OVE IRRIGATION SYSTEM AFYROAMATE.Y 2 YEARS AFTER PLANTIN& OR AS APPROVED BY TALASAEA CONSULTANTS. 6. FINAL MANTENNSCE 115EEi Ai APEROVAI,UPON COMPLETION OF THE ONE-YEAR MAINTENANCE PERIOD, AN INSPECTION BY TALASAEA CONSULTANTS SHALL BE CONDUCTED TO CONFIRM THAT THE FROJEGT AREA WAS PROPERLY MAINTAINED. IF ITEMS ARE TO BE CORRECTED, A RINGH LIST SHALL BE PREPARED AND SUBMITTED TO THE CONTRACTOR FOR CORRECTION UPON CORRECTION OF THE PUNCH LIST ITEMS, THE PROJECT SHALL BE REVIEWED BY TALASAEA CONSULTANTS FOR FINAL CLOSEOUT OF PLAN IMPLEMENTATION NOTES I, SURVEY PROVIDED BY ESM GONSULTINI9 ENGINEERS, 39915 IST WAY SOUTH 0200, FEDERAL WAY, WA 518005, (425) 415-5144. 2. 517E PLAN PROVIDED BY GPH CONSULTANTS, -133 TTH AVENUE, SUITE 100, KIRKLAND, WA 98035, f425) 285-2590. 5, SOURCE DRAWINGS WERE MODIFIED BY TALASAEA CONSULTANTS FOR VISUAL ENHANCEMENT. 4. THIS PLAN 15 AN ATTACHMENT TO THE FINAL WN£TLAND BUFFER IMPACT AND MITIGATION REPORT PREPARED BY TALASAEA CONSULTANTS IN .ULY 2014. 0 CALL Re PORE Sou oEo 7�00.4Ft400>!0 CITY OF FEDERAL WAY APPROVED FOR CONSTRUCI701"If BY, DATE' Cry W RRDOUL LIMY, DONRIHBVT w PHHw R/W PBRMRT N0, Z."."h, IN 1. . 1.1...,. rw.,.„.,,,., n,r .e kys,. nrrM 9 TA'. LEA CONSULTANTS, INC. Noeourcc d Envlronmentsl Plenn ing Z a Z a Z W O U o m Lu U o cn v� g " ZQZ LLJ ~ J Y 3 a DEVCO, INC. yuabq mama i1100 Mein Street, Suite 301 BELLEVUE, WA 98004 PHONE: (425)03-9551 g CPV x CONSULTANTS elm MPnIN, WEnft r7 UN Um LL,e -R*d Wriiii lnl m Tnd.uhrm 100 l IVY,RA WA WO11 Rga1�1IHbR1H I i�L.161HS>� 7ROlECTNO. TAL 1422 IRAWlNO W3.1 � SHEET--LOF 8� .r CONSULTANTS October 5, 2015 Mr. Jim Harris Planner City of Federal Way 33325 81h Avenue South Federal Way, WA 98003-6325 Site Planning Civil Engineering Land Use Consulting Project Management RESUBMI-1-'z NOV 10 mg CITY 9F FEDERAL WAY C0s RE: Kitts Corner Multifamily —City File # 13-104418-000-00-UP, CPH Project No. 0024-12-017 Rock Swale in Wetland Buffer Responses to Review Comments Mr. Harris, This letter and the following enclosed information are provided in response to your August 20, 2015 review comments from Talasaea's Consultants Wetland Buffer Impact responses for the Kitts Corner Multifamily project (City file no. 13-104418-00-UP): City Staff Comments: I. Provide the information from CPH Consultants discussed in your July 20, 2015 letter, page 5 paragraph 2, pertaining to an analysis being prepared by CPH to determine the maximum expected flow from the pipe. This information should include a recommendation of the width of any hardened wetland buffer intrusion (rock swale), which would be the minimum width necessary. Response: The upstream basin contributing to the 24-inch on -site culvert outfall appears to be substantial. The enclosed map, labeled Figure 1, shows the potential area that may be contributing to the pipe which is approximately 177 acres. To determine the expected flows a detailed analysis of the existing storm system and all deten6onlretention facilities would be required. We confirmed with the City that an existing basin and facility map was not readily available. Given the nature of the improvements and configuration of the storm system providing the discharge, we have determined it appropriate to consider the peak design flow as the maximum capacity of the existing 24-inch culvert flowing full. The peak design discharge was calculated to be 15 cfs as shown in the enclosed culvert capacity calculations. The 24-inch pipe flowing full would have an outfall velocity of approximately 4.6 feet per second. Per Table 4.2.2.A of the King County Surface Water Manual, the required protection at the outfall should be a 8 foot width (Diameter of pipe plus 6 feet) with a 1 foot depth of rock lining. Furthermore we recommend a trapezoidal channel of 8 feet in width, with 3:1 (H.V) side slopes, and 12 inch depth of rock lining, for the rock swale from the outfall of the pipe to the wetland This will keep the flow velocity just under 5 feet per second when conveying the maximum expected flow of IS cfs consistent with Table 4.2.2.4 (see enclosed calculations). 2. Provide an analysis and information discussing if any potential hydrological impacts to the wetland and wetland buffer could result from this proposed point discharge at the edge of the wetland, compared to the approved plan which proposes a dispersed discharge from the 24-inch pipe at the outer limit of the wetland buffer. Response: The bypass flows from the existing 24 inch culvert would have caused potential erosion issues that were not anticipated due to larger than originally expected flows dumping on the Roa7�fS0I�eJgveR-eddo d%fggstryfili iffl#,73%fip �i��X8��4 swale was installed wwmcphconsultnnts.com Kitts Corner Multifamily Request for Additional Information CPH No. 0024-12-017 October 5, 2015 Page 2 of 2 for erosion measures. The continued use of the rock swale will reduce the potential for sediment transport provide protection for the wetland. These flows were originally directed to the wetland and buffer and once vegetation is established within the buffer and swale it will function similar to the pre - development condition. The approved design provided for a rock reinforced oulfall. There was no formal dispersion facilities in the previous design. The location of this discharge was sited in the vicinity of an existing channel that was to be enhanced with the buffer mitigation. The proposed revision for a rock -lined swale at this outfall will result in reduced velocities. 3. Provide a written response how the proposed length and width of any wetland buffer intrusions meet the criteria for allowed public improvements in a wetland buffer as described in FWRC 19.175.040(3) (summarized above). Response: See separate written response from Talasaea, project biologist. 4. Provide a plan showing how the proposed rock swale would be designed and constructed in a manner that would be an ecological enhancement to the wetland buffer. Response: See separate written response from Talasaea, project biologist. Please contact me directly at (425) 285-2392 or by e-mail at Jamie cphconsuItonis.cam if you have questions or need any additional information to complete your review. Your prompt response and continued efforts are appreciated. Thank you. Sincerely, CPH Consultants Ja ie B. Schroeder, PE V'ke President Enclosures Figure 1 — Upstream Basin Map Conveyance Calculations Cc: Mr. Tom Neubauer (DevCo) Mr. Steve Sullivan (Heartland Construction) Ann Olsen (Talosaea Consultants) sGc"gig-�' _ � •i+�`rt�+'ry •l - � ^fir" I� - J - • '� + 4" gilt, ram'?+' - �•-'• '' % _ �, �' .-. -�'� - - �ia� � - CORNER KITT L i+iG��i^r ,'�7`�. :airii'_ .- _ �xia.^w - -•.•�-au-- -..io rcfi� 'w bmwii�_ Project: Kitts Corner Description: Open Channel Flow Date: 1-Oct-15 Chezy-Manning Equation Trapezoidal Channel Given: output: Base Width Depth of Flow Side Slope x Wetted Area Wetted Perimeter Hydraulic Radius Channel Length Elevation drop Slope Manning's n Open Channel Calculations Trapezoidal Channels Determine Flow Rate of Trapezoidal Channel 8.00 ft 0.37 ft 3.00 3.33 sq. ft. 10.31 ft 0.32 ft 100 ft 3.70 ft 0.037 fUft 0.030 Wetted Perimeter 10.31 ft Wetted Area 3.33 sq ft Hydraulic Radius 0.32 ft 'Velocity 4.50 fps Design Values of Manning's n Description Base width of Flow line Depth of Flow 1 vertical unit = x horizontal Wetted Area of channel Wetted Perimeter of channel Wetted area/ Wetted perimeter Channel Length Change in elevation Slope of channel Manning roughness constant Conversion 1 cfs = 448.83 gpm .nannei matenai n Cast Iron 0.013 - 0.015 Galvanized Iron 0.015 - 0.017 Brass and Glass 0.009 - 0.013 Concrete 0.012 - 0.014 Planed timber 0.011 Corrugated metal pipe 0.024 Natural channel, good cond 0.025 Natural channel with stones & weeds 0.035 Very poor natural drainage 0.060 Plastic or PVC 0.009 Kitts Corner Culvert Capacity Analysis C�xiS"{'1�5 Z G"Iver +) Q = K * AR2/3 * S1/2 n Originial 24" Outfall K = ' 1.486 n = 0.024 D = 24 inches A = 3.14 f A2 P = 6.28 ft R = 0.5 ft S = 0.014 ft/ft Q = 14.49889 cfs V= 4.61514 ft/s USCS units CMP Storm Drain Assuming full flow 1.4% Slope 10/1/2015 Open Channel Calculations Trapezoidal Channels Project: Kitts Corner Description: Open Channel Flow Date: 1-Oct-15 Chezy-Manning Equation Determine Flow Rate of Trapezoidal Channel Trapezoidal Channel Given: Description Base Width 10.00 ft Base width of Flow line Depth of Flow 0.32 ft Depth of Flow Side Slope x 3.00 1 vertical unit = x horizontal Wetted Area 3.54 sq. ft. Wetted Area of channel Wetted Perimeter 12.04 ft Wetted Perimeter of channel Hydraulic Radius 0.29 ft Wetted area/ Wetted perimeter Channel Length 100 ft Channel Length Elevation drop 3.70 ft Change in elevation Slope 0.037 ft/ft Slope of channel Manning's n 0.030 Manning roughness constant Output: Wetted Perimeter 12.04 ft Wetted Area 3.54 sq ft Hydraulic Radius 0.29 ft Velocity 4.23 fps Design Values of Manning's n Conversion 1 cfs = 448.83 gpm Channel Material n Cast Iron 0.013 - 0.015 Galvanized Iron 0.015 - 0.017 Brass and Glass 0.009 - 0.013 Concrete 0.012 - 0.014 Planed timber 0.011 Corrugated metal pipe 0.024 Natural channel, good cond 0.025 Natural channel with stones & weeds 0.035 Very poor natural drainage 0.060 Plastic or PVC 0.009 4.2.2 OUTFALL SYSTEMS TABILE 4.2.2.A ROCK PROTECTION AT OUTFALLS Discharge Velocity REQUIRED PROTECTION at Design Flow (fps) Greater Less than Minimum Dimensions(') than or equal to Type Thickness Width Length Height 0 5 Rock lining (2) 1 foot Diameter 8 feet Crown + 6 feet or + 1 foot 4 x diameter, whichever is greater 5 10 Riprap(3) 2 feet Diameter 12 feet Crown + 6 feet or + 1 foot or 4 x diameter, 3 x diameter, whichever is whichever is greater greater 10 20 Gabion As required As required As required Crown outfall + 1 foot 20 N/A Engineered energy dissipater required (1) These sizes assume that erosion is dominated by outPall energy. In many cases sizing will be governed by conditions in the receiving waters. (2) Rock lining shall be quarry spalls with gradation as follows: Passing 8-inch square sieve: 100% Passing 3-inch square sieve: 40 to 60% maximum Passing 3/4-inch square sieve: 0 to 10% maximum (3) Riprap shall be reasonably well graded with gradation as follows: Maximum stone size: 24 inches (nominal diameter) Median stone size: 16 inches Minimum stone size: 4 inches Note: Riprap sizing governed by side slopes on outlet channel is assumed to be approximately 3:1. 2009 Surface Water Design Manual 1/9/2009 4-31 CITY OF FEDERAL WAY COMMUNITY DEVELOPMENT DEPARTMENT DEVELOPMENT REVIEW COMMITTEE TRANSMITTAL DATE: August 11, 2015 TO: Ann Dower, Senior Engineering Plans Reviewer FROM: Jim Harris FOR DRC MTG. ON: NA FILE NUMBER(s): 13-104418-00-UP RELATED FILE NOS.: Yes, Many PROJECT NAME: KITTS CORNER MULTIFAMILY PROJECT ADDRESS: 1201 S 336TH ST Ann-: Attached is a,copy of•the Devco /'Talase`a July 20, 2015 request to construct (retain) the rock swale that has already been constructed for the width of the 100 foot wetland buffer at the north end of the site. I am looking for Public Works review comments and recommendation on this. I believe that this rock swale is in a City of Federal Way SWM easement, and it therefore seems it would be maintained by SWM. CD will need to make a written decision on this application, as it is an intrusion into the wetland buffer. I have not really discussed this much with Isaac, so I do not know CD's position on this. I think a big factor in CD's decision on the wetland buffer intrusion will be PW position. Can you review this with your dept and SWM as appropriate and let me know the preference of PW. I guess that potential alternatives to this proposal by Talasea could be: 1) a pipe in the length of the wetland buffer, or 2) some other more natural design (as originally shown on the approved wetland mitigation plan). TAILASAE.A CONSULTANTS, INC. 20 July 2015 Mr. Jim Harris Contract Planner Community Development Department City of Federal Way P.O. Box 9718 Federal Way, Washington 98063 RESUBMI i cc) NOV 10 201 �fTY OF FEDERAL WAy CDs TAL-1422 REFERENCE: Kitts Corner Apartments (No. 13-104418-00-up & No. 23-104419-se) SUBJECT: Response to Wetland Buffer Impact Update Request Dear Mr. Harris: Our Buffer Mitigation Plan (10 July 2014) for the Kitts Corner Apartments project identified the existence of a 24-inch stormwater discharge pipe at the north edge of the buffer for Wetland 1. No alterations to this discharge pipe were planned or required for the proposed buffer mitigation plan. Construction of the Kitts Corner Apartments began in the summer of 2014 and included clearing, grubbing, and grading of the buffer at the north end of Wetland 1. All work within the buffer was in preparation for construction of a soft -surface pedestrian trail and proposed buffer enhancement work (removal of non-native species, replanting with native trees and shrubs, and installation of habitat features) (See Sheets W1.2 and W2.0 attached). When the rainy season began in October, it was discovered that the stormwater discharge pipe releases a considerable volume of water. The discharge caused significant amounts of erosion and rilling within the graded buffer area (Photo1). Mobilized soil flowed in the general direction of Wetland 1 creating the potential of unintentional wetland fill. The contractor imported round river rock and created a rock - lined spillway through the buffer to control erosion and protect the wetland from sediment -laden stormwater discharge (Photo 2). The work successfully prevented further erosion, mobilization of sediments, and continued deposition of sediments into Wetland 1. Resource & Environmental Planning 15020 Bear Creek Road Northeast • Woodinville, Washington 98077 • Bus: (425) 861-7550 -.Fax: (425) 861-7549 •� ` �� '.-�: .;tip r��. . •� • � _ r je -�` , �. �+I'� • �` �..�i�•r!.P•���+-ad��'�._'.�,��'•l-r- Mr. Jim Harris 20 July 2015 Page 3 of 6 This work, however, fell outside of the approved buffer mitigation plan and was not permitted by the City of Federal. On 10 March 2015, the City of Federal Way, therefore, has requested that the buffer mitigation report be updated to show how the rock -lined spillway meets the requirements listed under Process III of the City of Federal Way Municipal Code. Additionally, the notice letter provided four bullet points that also must be addressed. These bullet points are: Provide an update on any intrusions into the wetlands or/or wetland buffers that were not part of the approved Wetland Buffer Mitigation Plan dated March 4, 2014. Identify status of wetlands and buffers for compliance with approved plans. Identify any changes that have occurred from the approved Wetland Buffer Mitigation Plan. • Any other items Talasaea identifies in the field. As was mentioned above, the discharge from the 24-inch stormwater pipe created erosional conditions within the buffer for Wetland 1 as the buffer was being enhanced per the approved buffer mitigation plan. To address the erosion problem, the contractor imported round river rock to line the flow path from the stormwater discharge pipe to Wetland 1, thereby preventing degradation of the wetland through excessive sediment deposition. This constitutes the limits of additional intrusion into the buffer for Wetland 1 that was not part of the approved Wetland Buffer Mitigation Plan. Wetland 1 has not been altered by the additional intrusion. Any changes to the status of Wetland 1 resulted in the potential deposition of sediments resulting from erosion caused by the discharge of stormwater from the 24-inch stormwater pipe. The originally -approved Wetland Buffer Mitigation Plan satisfies the criteria of Process III in that the buffer mitigation would not adversely affect the existing quality of the wetland, its buffer, and associated wildlife habitat. Clearly, the unforeseen erosion resulting from the stormwater discharge has the potential to adversely affect the quality of the wetland, its buffer, and wildlife habitat. There are five components that must be satisfied under Process III. These are listed below in bold type. Our responses follow each component in italic type. a) It will not adversely affect water quality: The conditions prior to the installation of the rock -lined spillway had a high potential to affect water quality. Soil mobilization caused by discharge from the 24-inch pipe would likely have a deleterious effect on water quality within the wetland. The rock -lined spillway prevents mobilization of sediments and the resulting reduction in water quality. Mr. Jim Harris 20 July 2015 Page 4 of 6 b) It will not adversely affect the existing quality of the wetland's or buffer's wildlife habitat. As with our response to Item a above, the mobilization of sediments resulting from the discharge of stormwater from the 24-inch pipe would likely adversely affect the existing quality of Wetland 1 by deposition of sediment. The likely result of such soil deposition is the loss of wetland vegetation and, consequently, a reduction of the ability of the wetland to provide wildlife habitat. The rock -lined spillway prevents the mobilization of sediments and their subsequent deposition in Wetland 1, thereby preserving existing wildlife habitat. c) It will not adversely affect drainage or stormwater retention capabilities. The existing 24-inch stormwater discharge pipe historically discharged water into a vegetated buffer area prior to sheet flowing into Wetland 1. There will be no alteration to the rate of flow or its duration as a result of the construction of the rock -lined spillway. Therefore the existing capacity of the wetland and buffer to retain stormwater will not be altered. d) It will not lead to unstable earth conditions nor create erosion hazards. The buffer conditions around the 24-inch stormwater discharge pipe prior to construction of the spillway created an erosion hazard as seen in Photo 1 taken prior to the construction of the rock -lined spillway. The spillway rectifies the erosion hazard by stabilizing the soil down -gradient of the discharge pipe while still allowing for sheet flow of stormwater to Wetland 1 (Photo 2). e) 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. The rock -lined spillway will not alter the hydrology of Wetland 1 compared to pre - construction conditions. Therefore, it is unlikely that the spillway will be materially detrimental to any other property in the area, nor to the City as a whole. The spillway will not result in the loss of open space. The rock -lined spillway may be allowed within the buffer for Wetland 1 per City of Federal Way Code §19.175(3) Essential public facilities, public utilities, and other public improvements, which states: "The director of community development may permit the placement of an essential public facility, public utility, or other public improvements in a regulated wetland buffer if he or she determines that the line or improvement must traverse the buffer because no feasible or alternative location exists based on an analysis Mr. Jim Harris 20 July 2015 Page 5 of 6 of technology and system efficiency. The specific location and extent of the intrusion into the buffer must constitute the minimum necessary encroachment to meet the requirements of the public facility or utility." The 24-inch stormwater discharge pipe is a public utility and represents an existing condition. The buffer mitigation plan inadvertently created a condition that had a very real potential to cause damage to the buffer and to Wetland 1. The most expedient way to rectify the situation was to import round river rock and line the expanding rill to prevent further erosion and potential damage to Wetland 1. An analysis of the contributing basin is being performed by CPH, who will determine the maximum expected flow from the pipe and will allow us to modify the spillway to a minimum width that still provides adequate protection to Wetland 1. Preliminary estimates suggest that the expected maximum outflow from the 24-inch pipe is between 15 and 20 cfs, which equates to approximately 6.4 feet per second. In addition, the rock -lined spillway will be enhanced with habitat features (such as logs and rootwads) and native shrub and tree plantings to achieve a more natural look and to restore the habitat potential of this portion of the buffer (Photo 3). A revised buffer restoration and enhancement plan encompassing the rock -lined spillway will be prepared and delivered to the City for review and approval. Photo 3. Large Woody Debris in Spillway. 29 April 2015. In summary, the stormwater flow from the 24-inch stormwater discharge pipe was causing significant erosion in the buffer for Wetland 1. The contractor responded to the erosion by importing round river rock and placing it into the rill that was being created by Mr. Jim Harris 20 July 2015 Page 6 of 6 stormwater discharge. This work was outside of the approved buffer mitigation plan. The City has responded that the existing report be modified to show that the placement of the rock within the buffer is compliant with the five criteria under Process III. We have demonstrated that, not only is the additional buffer work compliant with the five criteria under Process III, it brings the entire buffer mitigation work back into compliance. We trust that the information presented here will be sufficient in amending the Wetland Buffer Mitigation Plan for the Kitts Corner Apartments project. If you have any questions or require additional information, please contact Ann Olsen or me at (425) 861-7550. Sincerely, TALASAEA CONSULTANTS, INC. David R. Teesdale, PWS Senior Wetland Ecologist Attachments: Sheet W 1.2 Sheet W2.0 cc: Jack Hunden AS1724121 T - arch CS1T241217 - eng BETLANDS TWO D(. CONDITIONS COLA241217 CUSD241217 CUKS247217 CGRD241217 GLEARINO, 6RU55IN6 4 HABITAT FEATURE PLAN _ PLAN LEGEND T^ PRO-ECT SITE BOUNDARY 6Ftf4PHlG SCiQtLE { 1N lam) �"IU EXI5TIN6 WETLAND WETLAND 5UFFER/5ECURITY FENCE 50ALEJ"=30'"- - EXISTING STREAM CENTERLINE f EXISTING FOREST/SORUB-SHRUB VEGETATION NOTES FOR GLEARIN6, 6RUBBINcS 4 HABITAT FEATURE INSTALLATION PART 1, GEPL9iAL AMti Area B as own m e mitigation pkre (Sheet HI.O with the exception of flogged awstng vegetotlon 1.T SVOIME N& A. + pYSfOL 1. Cantrmbor shall give Taknomal Coraultmts a mntlren OF ten 00) daye notk, prior W begtntg carob-tlon. 2, No c4v*hWl6pT wank N.II earmnxa onbl there 1e a (Meting bet..Pae the 4lwa, Tataeosa Gaa.pi v". 9e 1, cFearrrg arWar iscra •k canh^mtcr s, erd the ta4ecapa oviraetar. The apprOVI a pram py yweakptt-e sW1 be rpvlwad to assure thrall all parties WMKVd.rtderoto•d tm hW% ant tie epeadre deW7e •e loied W W swet.Rictb'. dim-miI rpo llkdlwti OW -I aaalNraa. 3. LogaWffi oI axlesr�,,qg ra4nl.s have bean astdtNahod all kola w,%vg or GaLoWs a Fratx avalkble raaards and N.vrd be ccra dlwsa opproxselses pry and not reaae.anly GarplOta. It i the eale raepwabnny OF tie cantina W.- la. (0 tvdepordi mij vp•Ily as orx_," or Aumj ecatiaa Ovd (2) dlbrovar and rn ld p' YWIltias ..ILhh the miLkj YHf pVri [r'CarW that we not sAvwl tier W&I,"be affOOLIN l Rj =kwtl mmn a tN pion- Smit wedW we to be Gtswkj narked n the field- Yekap.e Eoraudaas shalt rawer try caN'kto WI tre approved MUgutan plan polar W mart OF umot mom. 4.A of !ie [px�tr. e.] phis WWat bs an site rierr.v.r -0nslructta+ is M PCOg OlIt. and snail rpTpb w NW yip IN 106t Cprpletlare 5. G-wL.O. met as pWorcacardpvta aa In owith 01 a3lsr4•B otonda. d, n,'". cadet, pe-A Gcr.'A11 le. didror Other cpplkaEo ts dnpraes and patkeet. a. The pia reel o rnnc�plkdN s, re.p table Fm obta" try other rakmI o- •+o"ad pdrt"ns li W W line a of = w�tbn. T. A quaHfled ecobglst shall ba Onaka. at noCasso�} W nanitan MFA4"bn Gantrtttlm OV Opprave -nor renalx4 to the pips, 6.Rrlry c ion tla % the adx ore* t rose e.otw•nls rod catboat'. methods that Prove" topic nibetpKw did 4lrar pO w"Its Fran tx w''hn] melgptlan ar,oe or Over tatllral Haters or tha sII F. Ftev.nNI room-" sh011 Ca wad to protect exbtr ]sear- dfaib]e SystOM 0-%tr.9 eth9l00. pV root.. IO,The cantrocicr shell w&AOD sedtnalt and er•Oelon controls oroud the project or" prior W tan tlbtlmbolGe try- c.a.WNcten mtFA9. B. {jpyjjppe TPe Follow" provide, tt. yrara ,l o,gvxrc.e of *antesann & ektate Pd to Da neE.sesoy W "Wplsto tr b a@kptbn praj.cL Some aF V-6 Mttvltl4s may too Gerdmtad Gdx 011krg ae She P'ojti I TOIa.o.o CO-%-ae, and to Orr.- ROPr 4e tN, 1. Gander o .Res -eating wl.eeaa ore Gaa>:octvr, to eovlaw Ma project Peale ..,A" dr,artg !Meth 3.taW'1 sill Fence and cry other eresx ad sedtnentatkm aontral BH % nsae"Ory Far work In the mRgpttwl wool'. 4,G low O'd gvb rn--r.alNelYhvpeMe -"Loki- From burfw S.Irotall snag. e, Armand son and place large Hood] matwkl. T, Cantrivet pedestrian wft-*ur•face troll wium Weser. B.G-W sct overlook r Install benches tad nterprett- 6". q. Complete site cloomp and tatall plant material as Mkdfer atod m tilt BMtgatlon Plmttg Plan. 10,1= splltTroll lance and witkol pea sky., IZ PROJECT GOtOI710N9 A pruiacsr- ma rFnwtwrcnp e} Orr�5oe them._ C40r kr s1harl -pro that Lanbrttbn related mtvn as do Fat dana3s OFF Ti to Feahrds w adjoc tit AWptlter, TOWeaa* GansAhcnla shall be Wtlfod tnTadteley If OGcldsrat damlap o"µ . Gontractx Man on II odj=" roads we montaned ad rapt claw of Ibll ar.mu• pit%- dames at au ttrle. a+-rg wntnKti-. GmtraGtw NNt a.ompy with the 9p'ro^*h5 prlecacetany raaeb rsga"dMg tricot mptrtsnmcaddwmtg d'•rt'9 caTrtr'IGLIon B. tWriggUmit, Any chages or mamFkotbr t* Tie mltg.tan Plam w speollicatare rust row PI approval From to *Harr rapre.lsntathn, Tak+toso GwrulSmL., dd applicable agonise. 13 WARRANTY h bp�yrSf�jL 11 y yid [� gh// y�y A aente•aG larYovldsd woTcnly Npl extend Fw a pwled of aw vita tram tfAs data OF pp�nndpp�t 1 Carrpl.Llm. Phphtal letbn fan fjle waNc oP ors section L. Mo data when aI ".ark h u . been a Tl.ttafd amid are ovspte6� arerY�rapre+-MaLLN0. Tonaoso G�ttpWI O d vpplknuta o3er.6sae- PART 2. PRODUGT5 AND MATERIALS 2.1 PNB'TAT FEAVN RY.5 A, 6Hollo. hestig Bares 1, Swallow rest" I -as ad Nall be Caratru.ted of cedar or cyprea, 2.0-tractor maj PwMea ewatlow resetg boxes at. a.Talmasa Gaswltanion (42W 661-T550 Or. b.S.attle Audh- 5"1.4 (206) S.>t,..,. or, ..Aid Bids Lhllmlted, (206) 575-4001 B, �6= Nall des codes or rr epeclae, 2 -55 feet I[. S Mlh a minhrtm of eight main wo-,.s, oid a dlanaler of 20 Hchaa aIt hand level "tar lrrrWl 4vm C. Dan tab, Lnr.n 1xp hVON tie cedes or Fr epeelee, have a 20 toot .rxrmm length, with or without no*!s, and p MsrMcm osomeler of le whes. Bark shall be kept bast. dI that have bean cut Mall be d!11I wo not bkA- D,g'}eT�n 5eurrp. Nall b. eFjar partaecayed, ra )rotated bturpb, or cut Ike root..oas r.nA o mNbun at twee le.i W bnaee 2C! rei.ee n dtoyater n+ww.11sh. F Faro lint Mara been GYS Nvlt ba dlsMaesed oho no blunt. E. Bmldas 1. Use boulders ~,wool Frwn aa-em.e goalre apotwtic s, If available. 2. One or twoper im mnnan sire with twelve tholes eselrren dNO1141 , 2.2 SOFT-51.11ill PATH A. Trall surf-Ing Mall be clean wootich9ae. See dotal) - mItkjotIan Plana. 23 TOPSOIL A.7(ilpo9L rpa�plr that tat been stockplind am Its For rouso n "Witwea(e) w wport.d From off-alte kcwY 1he11 ba Fertile. frlGds. smA loom sx'Foca f 11, Orals oM Mtlsol4 cloy krnpl. b vO% Iwstlt. foots, Blare. 1ay°r Men t lsctt > Oy doonsim Intw, w ay Other e.4raIvI ar Wxk matter harmful �9OwJ• B.t.fddttlatc Nrpo.'ted topsoil Nall cave! vi mabrlals amerxbtl n rocatawy W produce P p1Aht Cr1ka�1L CaetO•.t aF at local 10 percent ono rqt greater thm 20 "crowd, Os aste."MMetl by AASITYW .1q4, 2.4 MULCH A.BwTc w Asoatluga mulch shall be clerNed Nam Do n fr, pie - hemlock TOO*. Th. mulch Nall Flat Caritas rrpelM1 ex*n or other empourde M cT NI•• IFot woultl be detrnental W mlmal, plant life or B. Minot) Nall be gourd so that a mnMsn of q5% o# the matwlal will pass thr*4 a l3th -loslew and not more That 55%, by loose volume, will pass thn 0 a U5 No, 4 sew. PART S. EXECUTION A, 1. Pr'w La ay careuTwton, a IV,4_04 et mpr ,All rrvey, siesta. and Ilag eleo•hClear' PWbo, Clear' arthtlLs e depict" on the mnlgotkn ploy. Talasaa* c rwl! do a +loll Frew and approve Itorjge ar clsork NNlp7 to a y vagetaion removal. IL 0 Ma roopora Irtg of the corgrcI La the MWOI Scat of vo=.Wn la be saved Old tegr, t fiat Ta1060ING Cxealtant. MOON 00 lan pwn m ro4o" to woe aft "Yoftani x6ha vegvloskxL 2. G<wltmLar Ng11 surrey the Centel- Are of pfoifoelstl than. rakaeeo GonwAtan44 .111 L"m rev/i.t pd m r I�rae�rllb lsaacs�saa�sa'tj to *mold dNtnC.a'rra of amid" Ntjr Morin treo0. No treso shai B. (gm�pgect ^._-trA9�epelpbm to Rerhon- t. eaFtroctw Nall be nmFomatme for pvaldrg astuxboaca to exiI weaLOU)n kKatod *Aside the =.. NO rea,val GO ary vwpldtlan atoll octw without polar ppVvc1 by Talasaaa 2.M)Id6ded Ca fta" shell P109 axeUU++gg ratan to remote tecatad wbhh !1t hit areas. Frogged vagetatsen Nall rat be ded.rtacw mkm app d! M wit" 4 T*lwwa ItMLe, S.(,phb•actdr stall axerche tar to prevent %)Wlj to tie V.* r0e1., ad ltd A Or o-sse pm 111rvn. to ronah, AN woody plant W wrah t M It dmKged dlhtrg� 6-eWei•m .hNl ba troatad Ink wallopp after O[aVY, ha'Id Tp1Ovsw GPnwllanle shall bo.Vq.d of neldam. Dah"a v*cN L hlhal( sTCluds av- wtI" broken brorchae, lxatan roots. Gird dexsyaa treo bwFr. th.= plans einll be thorau¢Ay tad 015cil nol naglrae 001 ba tamv Pb 41wOF`ktta, to a n plant Wryh,O1, 1. d.attoctx Noll ►.stoll WIL Par" wwo shun - the makjrAran pkra wkxn to py n*tIBtlDM colacractlon atmpI GarrT t, Nan -autos atoll cmlral Imimibes ukq GempWt%pr of as vmtw. rakto c, CAr RmOts shall vwlfy aid cpprow kxatlw4 of drostm 00ft"t FF0011 ae WW W cenrx 4"q m"Jottan aaratnwttm. 2-Grr4raclor shall =WfLd% erOill GOr"I I.e 69 Far rlobaotfm work y,alr be GoaraMlaa WIM .Odor A c Yrel far rw site work go necaway. I msdlxra tun rw..ri. M ptxe orris wthorirotb. 4 SNv by Td"": CtrauRpnls For rernp•..el or location od)AwmaTt- 11a to r4sportbl of the c Iecp tom W rampw OII erC.11m W fh l F%NasI adjae..r.} to ~Ns. oral +hen mI by Tolasaaa 3.A4-estrvctl- protl-dku ad •easorml ca.dls le. oroslm w r*V tcwlllts all be mo *A d OwAw pq was rogvrradl by Takn.aaa 6c-ltmie to arose Gamed sroekhrryedw,snto'tprr corrVOL 4, Whale possble, mta•al gaud cprer wgsWtlen shall be mantagad for erosion cmtrol. D. r�,.eALSA.WRhr, Ve Wtbn Korn 1 Mann rlY�y usy A -am, I. Caltractw shall gib out with mach" all ncamatvr hard krvmtw vegetation within Willer mlt"Im to ramOM, 2.Gm tloota" shall 9W out by r.nd oil Tian-nat" Ord tmxseha vegetation WVM wf der mitlg*t Area C. a sla m Ih mllkptor, pkie f5hsat Wk1, CoW roum shall fanlarls WW Nv species r+chWar.], but are ml Imad Lon Sooty 1Xaol isgtleh X-g, htmalagw, wok groan bWtbb" p• V1, komWile, hedge twxkteed lMornvy� glory), Jgoploee Ganxkia t�iwettla. Rood conaygaee ayes creepIr9 md"Gehode, Ail rd.Et .Fall be rprarad Lv )Ore maxbµn dxllsra prom liwye. B. COMWOGtar btall Glow Ord 9%b troll 047- nt avrrldar 4. Alt gird vegeSaton elan be lsxparted from the site pie depo"d of % m GpPSovad ,array WlkAwhA9 all pppjrG06t0 WaaV9labAYOYe! regAlatian. 5. Talosae. 6oreu010a *tall deslgat, erg amill x al plant epaaae to be romavaa" mitigation Gaatnetpri e. IreWu s.haa.. I. lnstalr e.e9 vi on compietm of 4lawhverl" at leeomora pepkled a m1tval n pyre (see Detail 6). y'p9s shall to vGIAa"ed rota aAxJ'a0a a -iris-) M 25 Porahwx of to tai01 tolrgtFr m depleted In tob psm deWll. TOlasolsa GanhAlayts Nall Opp 7 s^o9 lOcotrora "tar V rotorI )tiro. P. jo-011 I. In all clea•ra and grvbbsd bolter mlt tbn acs, existing soll shall be ae(or topsoil wpxt4d) to Prow 1. a q-nch mntram depth of �apo Bollmmnded . a tts" EQmWAs. Plora haFI rooaree A.pav caopetkrn of Wpeon awor som 0-v,&,am plocowm m dap 4- lie mltkpllm pla'a trot d'at*te. iplr4oe0 GprsuHWeks shall appraw 1v. nor* prior ee 1. bdagma. tkaglaJ52mam, Attach one reset k] box to aoch halwlled er.ag a mfly* In of 15 feet oft tls - the eaadhaaal old- Of the xa f. to addhlorr, ton CIO) add ltWrol "410w task boxes L4011 be Otrea an exyihq beep . 11to bjf- eNhauement Treat, approxbntey !S• off the g c vd on the 5E bkT. of frees. $ l locatloro to to mtprmined % tW Held Cy raraeaaa CawAtenta- 2.2AWjyq'jt To CLttrodk dohs loge, Ire1 ,Or, the "et the dasred twgth N mechenkCl meets. Men ab'P the IOg at the scared WAN.%. to Gropera a hrol look to U. rhe qvk_ bra "Twist l.ln ands to des ry..ue cow C>,4e. H,,I leagres the taro been ci Nall tars m Whit ands. 3.° {'Fortis aMP be set upright- 4. If aAonaoe, bovldan shall be placed In plies at least 2 rocks deep (5 rock met. per pile), k1 a maser uwt p.rovtdeb both phyeltal stabllny and )age Internal voids. H. �eioah Corstva OVxlook M..quolnt at location cWpbted m Sheet HI.2, Per detail 4 - Shoat HBO I. Intall Troll, I. C Fabwt sott-pwface trail M wailwal Weser Whom shown On plane per Detail 6. 2. lntall Bombes per marw -Lrany specnkatbr4, 3. I..Wll INarpretive Sir par Detail 2, 5haat VGA. J. mhCd�rr�(t(�yl]tlaa 23At-lremr Tolcea,G C~mm W411 W x doo a moth rarpl. prior W It wig dW[wr.a !a to bM . No b~ orate stoli n needed. I. ColbraGtx shah spread mO p all dsLmbea sail b~ waw That hone been cbxealrj'.[Lad to A%aew .'x Tort, 6" .r 5 fid- K, k^L L _mod F s - LIN ar tee . L rratdl fan, as Nun m fil-t ..l tier detall I, cheat VGA, 2. 111 Critical area a" w sholm m Shoal "j, p,r dalml S. shav% OOD, L. Prior to plw4 ratsltokToq Ta•,soao C4rte9ass N.elt ""prove al a l,o'4hglgni.%lig work OW 'd faatwo psw.alTryd. IF hams n'a to be c.*rr'ecrad, a plxkn 11sL shall be pre paed by TpWwaa e:~Ny eras and euer,ued to the coftb atw far compelrarv. Aker punch Ile' "m hp.a b,an can•(1foWd- Tolosa,a Coraultants Nan review the pmJeet Far trar aeeeplo of rAmh set ttame. Ord pantry mo) than prnaeaa, M. Sall 9fdpltallan, IF there is a deloj M c14tM11et Far try reasal, rmtr,eror "'I be ree1 Far mo m4navra ar 4roekxr wr4rol nhaoslre., ;lronaya, wd terrporary rr'19atlp'v dw•Yhg Gontrvctlan delay Period, wlgY clh.r..I.a stated In -0tkq C,LEARINO 4 6RUBSIN6 4 HAP I TAT PEA7URE LEGEND 5TuMP ® DOl^W LOS 5NAG HITH SWALLOA ee NEST BOX, SEE DETAIL Hs NOTE. IN ADDITION TO A SWALLOH NEST BOX INSTALLED ON PROPOSED SNAG, TEN (10) SWALLOH NEST BOXES SHALL BE INSTALLED ON EXI5TIN6 TREES WITHIN BUFFER ENHANCEMENT AREAS. EXACT TREES AND NEST BOX LOCATIONS TO BE DETERMINED IN THE FIELD BY TALASAEA CONSULTANTS. SILT FENCE, SEE DETAIL r. BRj D ENTIRE AREA BY 18,23g SF HARP Elf -I OR MAGNTO R l2EM0vp ALL INVASIVE 5IVE 51"E0IE5 AND REMOVE ANY TRASH AND DEBRIS SELECTIVELY GRUB OUT 4b53 5F ALL NON-NATIVE INVASIVE SPECIES BY HAND. PROTEOT EXISTIN5 NATIVE VEGETATION TO REMAIN. -40M IN ILTER PAVRG SKALL BE 5PUC40 AT Ft'+3T5. 115E STAPI M FIRE f'_ OR 2QIIYAL�r1 m ATTACMr PABa10 ro POSTS 21Q' BY 14 SA, HIRE OR EGUIVALB r. [ [ FILTER FAMCr !k ! IL 7 MPJt P9>aN1M 4'x4BAGt�ILIf T 5PA[.Ile5 hfAY r1ae11CH FaTN BE I EII BTO NATIVP SOIL 6' IF KRWIVE r .KCMS NOTE. FILTER FABRIC FEES RL9nR Ott EOUFVALYMr NC SHALL BE INSTALLED ALONG CONTOUR W-ETgVER POSSIBLE. 51LT FENCE MAINTENANCE STANDARDS, I. ANY DAMAGE SHALL BE REPAIRED IMMMIATIII 2. IF GOHCEN7R1TED FLOHS ARE EVIDENT UPSLOPE OF THE FENCE, TffY MUST BE INTERCEPTED AND CONVEYED TO A SEDIM EI POND. 3, CONT:ACTOR ALL SHCHECK THE UFSLOPE SIDE OF THE FENCE FOR SISNS OF GLOSSING AIL VA35EOLENT CHAN!'LIZATION OF PLOWS PARALLEL TO THE PENCE. IF THIS OCG.RS, REPLACE THE: FENCE AND/OR REMOVE THE TRAPPED SWIFM 4, SEDIM . SHALL Be REMOVED WHEN ACGUI"AA.ATION EXCEEDS 6" IN DEPTH. � � P NOTES I. SURVEY PROVIDED BY ESM CONSULTING ENSINEERS, 33g15 IST WAY SOUTH 0200, FEDERAL WAY, WA g6005, (425) 415-5144. 2, 517E PLAN PROVIDED BY OPH CONSULTANTS, "S TTH AVENUE, SUITE CO, KIRKLAND, K A gb055, (425) 2b5-2390. 3, SOURCE DRAWINGS VERE MODIFIED BY TALASAEA CONSULTANTS FOR VISUAL ENHANCEMENT, 4, THIS PLAN 15 AN ATTACHMENT TO THE FINAL V•E:TLAND EATFFER IMPACT AND MITIGATION REPORT PREPARED BY TALASAEA CONSULTANTS IN J)LY 2014. ,t _ CALL Be FOR! YOU DIO �-eoo�s4eeee CITY OF FEDERAL WAY APPROVED FOR CONSTRUCTION BY: DATE,• OTY OF F XML My. W MIEM OF Pm~_ R/WFERMITNO, 0(-'.I..• rtlt - id.n,. r,n."ma ran ,-.1 x,Nl. rnrm. 9 TALAS LEA CONSULTANTS, INC. Rareercc d Eyvlronmentel PI ... lox rww r�wn Z Z a gW a F Z � W Z W z In O 03 � g Z ��QQ] Y DEVCO, INC. yual,ry co..ny 11100 Meln Street, Suite 301 BELLEVUE, WA 98004 PHONE: (425)453-9651 tag 9 CP H CONSULTANTS sea Flitting . CMI114matlng Ind UNCaeuNng. IMcd MINIII xn! ifli*Am.w,bN haC I kMv4 WAxpY Fat... Ilkali ni��eo�mI� TrDjECTNo. a T_A IL 1422) IRAW MO SHEET-.,-_ 8 AS17241217 - arch CSIT241217 - eng WETLANDS TOPO Ex CONDITIONS CBLA241217 CUSD241217 CUWS241217 CGRD241217 '-Y-• 7 , p][aY�'•a ?off 1► `3'� * `.Y"� 17 � �r",FII 0 f►'� is /Il •- -• 2-BOARD r~ IRRI IRrI IRRI. fRRI: Irel IRn — IRRI rRl: f I q o ' GRADING LIMIT FOR q CIVIL SITE WORK 1 v�'i `J \ SOFT SURFACE TRAIL WETLAND I 93,320 SF ON %TE Id/ Ij/ 41\ CATEGORY II �r PLANTIN6 AREA A PLAN LE6r5D � ❑ GRAPHIC SCNo1zTH PROJECT 51TE BOUQO?ARY ( IN FEET) ALE EXISTING WETLAND � •' WETLAND BUFFER/SECURITY FENCE' , 0 D 2O 40 }• EXISTING STREAM CENTERLINE Ol SCALE: P=20' EXI5TIN6 FORE5T/5GRI1B-SHRUB ' 0 VEGETATION PLANT L I ST LARGE TREES MASSING SHRUBS KEY SCIENTIFIC NAME C474MI0N NAME KEY SCIENTIFIC NAME COMMON NAME j O G0RN16 ALGA RED-OSIER l ER MAGROPHYLLUM BI6-LEAF MAPLE Q MAHONIA AGIUIFOLIUM T� 6ON D BETULA PE PAPYRIFERA PAPER BIRCH Q ROSA 6YMN0GARPA BALDHIP ROSE CORNUS NUTTALLII PACIFIC, 00614000 ® + P5E31D0TSU6A FSNZIE511 D0U61-A5 FIR RO`A NUTKANA NOOTKA R05E �+ PSEUD0TSU6A MENZIE511 D0U6LA5 FIR OO RUBUS ,,yy�� PARVIFLORUS THIMBLEBERRY �L { A J FRAN6ULA PURSHIANA CASCARA ® SPEGTABILIS SALMONBERRY �J 1 i THUJA PLIGATA WESTERN RED CEDAR m SYMPH0RIGARPl15 ALBUS COMMON SN0'r�'EFRY 0 THUJA PLIGATA WESTERN RED CEDAR �. TSU6A HETEROPHYLLA HE TERN HEMLOCK GR0UNDOOVER5* KEY SCIENTIFIC NAME COMMON NAME O T5U6A HETEROPHYLLA WESTERN HEMLOCK 6AULTHERIA 5HALL0N SAAA \ G SMALL TREES/LARGE SHRUBS s�soL P0LY5TIGHUM MINI" 5WORD FERN KEY SC.EENTIFIG NAME 00MMDIi NAME •6R0UNDC0VER SYMBOLS ARE NOT SHOWN ON PLANS. \ AC--R. CIRGINATUM VINE MAPLE 6R0UNDC0VER SPECIES SHALL BE LOCATED IN BETWEEN TREE AND SHRUB GR0UPIN65 WITHIN BUFFER MITIGATION L� IQQ� BUFFER — AREAS A 4 B. IN AREAS LESS THAN 3' WIDE AT THE TOE OF 17 O AMELANGHIER ALNIFOLIA SERVIGEBERRY ANY RETAINING WALLS AT BUFFER PERIMETERS (E.6. BUFFER ORESTORATION AREAS DISTURBED BY SITE 6RADIN6 OR p CRATAEEIY D0U6LA511 BLACK HAWTHORN WALL CONSTRUCTION, SEE BUFFER INTRUSION AREAS M r r DEPICTED ON SHEET 141.0, 6R0UNDOOVER5 SHALL BE FIELD MATCH LINE TO PLANTING AREA 5 HOLODISCUS DISCOLOR OCEAN SPRAY LOCATED BY TALASAFA CONSULTANTS. OEMLERIA CER 51F0RM15 INDIAN PLUM O RHODODENDRON PACIFIC, MAGROPHYLLUM RHODODENDRON SAMBUG)S RACEM05A RED ELDERBERRY �n • 5ORBU5 5ITCHEN515 51TKA MOUNTAIN ASH 19 NOTES I. SURVEY PROVIDED BY E51-1 CONSULTING ENGINEERS, 33915 15T WAY SOUTH #200, FEDERAL WAY, WA 9b003, (425) 415-5144. 2. SITE PLAN PROVIDED BY GPH CONSULTANTS, 733 lTH AVEMF, SUITE 100, KIRKLAND, WA 98033, (425) 285-2390. 3. SOURCE DRAWIN65 WERE MODIFIED BY TAL.ASAEA CONSULTANTS FOR VISUAL ENHANCEMENT. 4. THIS PLAN 15 AN ATTACHMENT TO THE FINAL WETLAND BUFFER IMPACT AND MITIGATION REPORT PREPARED BY TALASAEA CONSULTANTS IN DULY 2014. 95 M R<e<e... a ;a.leonmenLl P1•Ynln[ z Z 3 gU CL z Z Y W NZ w cr 0 00 g < �^) Q a 3 Vz o w z o CUENT DEVCO, INC. '.14Y c.- 11100 Main Street SUWe 301 BFI I M E, WA 98004 PHONE: (425)453-9551 JIMCALL BEFORE YOU DIG CP H vy �-800-4245555 CONSULTANTS se<Pw.N • c 1D*1 v Inrd Ilse Careultlng • Pmlea.ena�an iii M,Ann5io]ro (42T ® Rac P>smszao fAt1115)RDAr =OFFEDERAL WAY APPROVEDFORCONSTRUCTTON PROJECT NO. TAL 1422 BY.• DATE' DRAWING aN OF FEMPA WAY. OEWMI M OF PIAOM W2 .O R/R'PERMITNO. SHEEP 5 OF 8 WETLAND BUFFER MITIGATION PLAN KITTS CORNER MULTI -FAMILY FEDERAL WAY No. 13-104418-00-UP & No. 23-104419-SE FEDERAL WAY, WASHINGTON Prepared For DEVCO, INC Bellevue, Washington Prepared By. TALASAEA CONSULTANTS, INC. Woodinville, Washington 4 March 2014 (Revised 9 July 2014) 'esu BNIj ,a I I " wm_- Wetland Buffer Mitigation Plan Kitts Corner Multi -Family Federal Way No. 13-104418-00-UP & No. 23-104419-SE Federal Way, Washington Prepared For., DevCo, Inc. 11100 Main Street, Suite 301 Bellevue, WA 98004 (425) 453-9551 Prepared By. Talasaea Consultants, Inc. 15020 Bear Creek Road NE Woodinville, Washington 98077 (425) 861-7550 4 March 2014 (Revised 9 July 2014) Kitts Corner Multi -Family Wetland Buffer Mitigation Plan PROJECT NAME CLIENT: EXECUTIVE SUMMARY Kitts Corner Multi -family DevCo, Inc., Mr. Tom Neubauer SITE LOCATION: The Kitts Corner property is an approximately 22.9-acre site located southwest of the intersection of S 336th Street and Pacific Highway S in Federal Way, Washington. The property consists of four parcels. King County Tax Parcel numbers are 2021049070, 2021049001, 2021049072 and 2021049004. The Public Land Survey System location is Section 29, Township 21 North, Range 4 East, Willamette Meridian. PROJECT STAFF: Bill Shiels, Principal; Ann Olsen, Senior Project Manager; David R. Teesdale, Senior Wetland Ecologist; Adam DeWolfe, Mitigation Designer/Project Planner FIELD SURVEY: Conducted on 24 September 2012 and 5 September 2013 PROJECT BACKGROUND: The Kitts Corner Site was originally part of a previously proposed development called The Federal Way Village Master Plan. During the permitting for that project, on -site critical areas were delineated and rated by others (see the Wetland Delineation Report for Federal Way Village prepared by Raedeke Associates, Inc., dated 5 September 2006; and the Wetland Assessment of the Kitts Corner Property prepared by Raedeke Associates, Inc., dated 7 September 2004). The original four parcels have been divided through a boundary line adjustment (BLA). The Kitts Corner Multi -family project (hereinafter referred to as the Project or Site) represents approximately the western half of the original Federal Way Village project site. The current Project Site contains two wetlands designated as Wetland 1 and Wetland 2. Both wetlands are rated as Category I I wetlands with 100-foot buffers. There is also one stream on the site which flows north to south through Wetland 2. This stream is named West Hylebos Tributary 0014A, which was rated as a "major" stream by the City of Federal Way's 2002 stream inventory. EXISTING BUFFER CONDITION: Talasaea conducted two site investigations to evaluate the existing buffer conditions and to locate acceptable routes for the proposed trails. We defined three unique buffer conditions. These are further described below: 1. MIXED FOREST: The northeast and inner eastern portion of the buffer for Wetland 1 and the northwest and inner western portion of the buffer for Wetland 2 contain mixed forest consisting of black cottonwood and red alder with an understory of small trees, shrubs and grasses. Some areas are lacking a shrub component and are mostly grass species. 2. MATURE CONIFER FOREST: The outer portions of both buffer areas contain a very dense mature Douglas fir forest with a typical mid -canopy and understory of native large shrubs/small trees and groundcover species including: vine maple, red elderberry, salal, and sword fern. 3. OPEN AREAS: The northern central portion of the buffer for Wetland 1 is primarily open and vegetated with a mix of non-native/invasive shrubs and grasses. Non-native/invasive species include: Himalayan blackberry and Canada thistle with some Scot's broom. PROPOSED PROJECT. DevCo plans to develop the Kitts Corner Multifamily project with 15 multi -family buildings containing a total of 216 units. The site is zoned MR (multifamily residential). The site will also be developed with required parking and drive isles, a pedestrian promenade and other paved walkways, landscaping, open space areas, a recreational building and pool, and utility infrastructure. The main access to the site will be off of S 336th Street. A secondary access will be provided out to Pacific Highway S at the southeast portion of the site. See the project narrative prepared by CPH consultants for more detailed information about the proposed project elements. Overall, approximately 10.3 acres (45 percent) of the Site will be developed with apartments, recreation facilities, open space, roads, parking, and sidewalks. The remaining 12.6 acres (55 percent) of the site will be permanently protected in two critical area tracts as wetland and wetland/stream buffer. ASSESSMENT OF DEVELOPMENT IMPACTS: No impacts to the wetlands are proposed with this Project. The Project will be constructed, for the most part, outside of the buffers for Wetlands 1 and 2. 9 July 2014 Copyright © 2014 Talasaea Consultants, Inc. 1422 Kitts Corner Wetland Buffer Mit Rpt-3 (9Jul2014).docx Page i Kitts Corner Multi -Family Wetland Buffer Mitigation Plan However, the Project will result in some minor intrusions into the buffers for Wetland 1 and Wetland 2. These intrusions include: 1) Temporary impacts due to the construction of retaining walls near the buffer perimeter, installation of five dispersion trenches in the outer edge of the buffer, and intrusion from general site grading into the outer edges of the buffer. All temporary buffer impacts will be the minimum necessary to construct the project infrastructure. In total, there will be approximately 6,919 sf of temporary impacts to the outer edges of both the Wetland 1 and 2 buffers. 2) Minor improvements in the form of two soft -surface pedestrian trails. One small loop trail will be located in the north portion of the Wetland 2 buffer, and a large loop trail will traverse the north and east sides of the Wetland 1 buffer. These trails are required by the City of Federal Way in order to include portions of the buffer as part of the useable recreational open space plan for the project. The trails will have multiple viewpoints and one raised wetland overlook platform. All viewpoints and the overlook platform will have a bench, interpretive sign, and trash receptacle. Some small shrubs and groundcover will need to be cleared and grubbed along the trail routes, but the trails will be located to avoid all significant trees and to minimize impacts to native vegetation, and will be surfaced with woodchips. Approximately 6,123 sf of buffer area will be needed to construct the trails and viewpoints. PROPOSED MITIGATION: Buffer Restoration for Temporary Construction Impacts; To mitigate for temporary impacts from site construction the project will restore approximately 6,919 sf of buffer area. Mitigation measures will include importing topsoil or amending disturbed soils with compost as necessary, mulching all disturbed soils, and fully revegetating disturbed buffer areas with a variety of native deciduous and evergreen trees, shrubs, and groundcovers. Buffer Enhancement in Passive Open Space Areas: DevCo is proposing to provide 39,679 sf of passive open space in the outer portions of the wetland buffer areas (total required on -site open space is 86,400 sf). In order to meet the requirements for common recreational open space, the City of Federal Way requires that the buffer areas designated as passive open space be enhanced in order to provide value and enjoyment to residents as an open space amenity. Three buffer enhancement areas have been defined which will require different levels of enhancement depending on existing vegetation conditions. The most degraded areas will require the most enhancement, and the relatively well -vegetated existing forested areas will require the least enhancement. The general goal of the buffer enhancement will be to increase habitat value and ecological functions by removing invasive species, installing habitat features such as stumps, down logs, and bird nest boxes where feasible, and increasing habitat structural diversity and plant species diversity by interplanting existing native vegetation with additional native evergreen and deciduous trees, shrubs, and groundcover. In addition to providing a more valuable ecological amenity for residents, these enhancements will provide general aesthetic enhancement as well Critical Area Fencing: A 2-board fence (or similar fence type) will be constructed along the inner edges of both buffer trails to prevent human intrusion into the wetlands. Additionally, the outer edge of the buffer adjacent to both wetlands will also be fenced with security fencing, to be determined by owner. Critical Area Signs: Critical area signs, consistent with City of Federal Way Design Guidelines and code requirements, shall be installed at the buffer boundary every 100 feet. MAINTENANCE AND PERFORMANCE MONITORING: All of the restored and enhanced buffer areas will be maintained and monitored for five years to ensure compliance with the stated goals, objectives, and performance standards approved by the City. FINANCIAL. ASSURANCES- The Applicant shall post a bond or other financial guarantee as required by the City to ensure that the mitigation plan is fully implemented, monitored, and maintained through the end of the required monitoring period. Financial guarantees shall meet the requirements of FWRC 19.150.060 and FWRC Chapter 19.25. 9 July 2014 Copyright © 2014 Talasaea Consultants, Inc. 1422 Kitts Corner Wetland Buffer Mit Rpt-3 (9Ju12014).docx Page ii Kitts Corner Multi -Family Wetland Buffer Mitigation Plan TABLE OF CONTENTS ExecutiveSummary ..................................................................................................................... Tableof Contents.......................................................................................................................III Lists of Figures, Tables, and Appendices .......................................... _..................................... iv Chapter1. Introduction................................................................................................1 1.1 Statement of Accuracy..................................................................................1 Chapter 2. General Property Description and Land Use..............................................1 2.1 Project Location...........................................................................................1 2.2 Project Background......................................................................................1 2.2.1 Original Proposed Development..............................................................1 2.3 Critical Areas................................................................................................ 2 2.3.1 Wetlands..................................................................................................2 2.3.2 Existing Buffer Conditions........................................................................ 2 Chapter 3. Proposed Development..............................................................................3 3.1 Project Description.......................................................................................3 3.2 Stormwater Management............................................................................. 3 3.3 Assessment of Development Impacts...........................................................4 3.3.1 Temporary Impacts from Site Construction..............................................4 3.3.2 Pedestrian Trails and Viewpoints............................................................. 5 3.4 Process III Buffer Modification...................................................................... 5 3.4.1 Process III Approval Criteria for Minor Improvements for Temporary ConstructionImpacts...............................................................................6 3.4.2 Process III Approval Criteria for Minor Improvements for Pedestrian Trails andViewpoints.........................................................................................7 Chapter4. Proposed Mitigation................................................................................... 8 4.1 Wetland Buffer Mitigation..............................................................................8 4.1.1 Buffer Restoration for Temporary Construction Impacts..... ...................... 8 4.1.2 Buffer Enhancement in Passive Open Space Areas ................................ 8 4.1.3 Critical Area Fencing................................................................................9 4.1.4 Critical Area Signs............................................................... ................. ... 9 4.2 Mitigation Goals, Objectives, and Performance Standards ........................... 9 4.3 Buffer Mitigation Design..............................................................................10 4.3.1 Topsoil & Mulch.....................................................................................10 4.3.2 Plantings................................................................................................10 4.3.3 2-Board Fence and Critical Area Signs..................................................10 4.3.4 Interpretive Signs and Site Furnishings..................................................10 Chapter 5. Construction Sequencing.........................................................................11 5.1 Mitigation Construction Sequence..............................................................11 5.2 Post -Construction Approval........................................................................11 5.3 Post -Construction Assessment...................................................................11 Chapter 6. Monitoring Methods..................................................................................11 6.1 Reports................................................................................................... 11 6.2 Monitoring Methods....................................................................................12 6.3 Photo Documentation.................................................................................12 6.4 Wildlife........................................................................................................12 6.5 Site Stability................................................................................................ 13 Chapter 7. Maintenance and Contingency.................................................................13 Chapter 8. Performance and Maintenance Bond.......................................................14 Chapter9. Summary ..................................................................................................14 Chapter10. References..............................................................................................16 9 July 2014 Copyright © 2014 Talasaea Consultants, Inc. 1422 Kitts Corner Wetland Buffer Mit Rpt-3 (9Jul2014).docx Page iii IKitts Corner Multi -Family Wetland Buffer Mitigation Plan LIST OF FIGURES Figure 1: Vicinity Map and Driving Directions Note: All figures are located at the end of the report before the appendices. LIST OF TABLES Table 1. Summary of Wetland Buffer Minor Intrusions............................................................... 5 Table 2. Projected Schedule for Performance Monitoring and Maintenance Events ............. 12 LIST OF APPENDICES Appendix A: Wetland Buffer Mitigation Plans (22"x34" Plan Sheets) Sheet W1.0: Existing Conditions Plan Sheet W1.1: Proposed Site Plan, Impacts & Mitigation Overview Plan Sheet W1.2: Clearing, Grubbing, & Habitat Feature Plan Sheet W1.3: Details Sheet W2.0: Planting Plan Sheet W2.1: Planting Plan Sheet W3.0: Plant Schedule, Details, & Notes Sheet W3.1: Planting Specifications _I 1 9 July 2014 Copyright© 2014 Talasaea Consultants, Inc. 1422 Kitts Corner Wetland Buffer Mit Rpt-3 (9Ju12014).docx Page iv Kitts Corner Multi -family Wetland Buffer Mitigation Plan CHAPTER 1. INTRODUCTION Talasaea Consultants has been retained by the Applicant (DevCo) to provide professional wetland consulting services for the Kitts Corner Multifamily project (referred to herein as the Project) in order to address proposed wetland buffer intrusions and temporary wetland buffer impacts resulting from the proposed development. This report is being provided pursuant to the Process III submittal requirement for "special studies and additional information" relating to the projects impacts to on -site wetland buffers. The purpose of this report is to summarize the proposed critical area impacts on the project site, demonstrate how the proposed impacts are consistent with the critical area requirements of the Federal Way Revised Code (FWRC), and generally describe the mitigation proposed to compensate for the impacts. 1.1 Statement of Accuracy The wetland buffer analysis was conducted by trained professionals at Talasaea Consultants, Inc., and adhered to the protocols, guidelines, and generally accepted industry standards available at the time work was performed. The conclusions in this report are based on the results of analyses performed by Talasaea Consultants and represent our best professional judgment. To that extent, and within the limitations of project scope and budget, we believe the information provided herein is accurate and true to the best of our knowledge. Talasaea Consultants does not warrant any assumptions or conclusions not expressly made in this report, or based on information or analyses other than what is included herein. CHAPTER 2. GENERAL PROPERTY DESCRIPTION AND LAND USE 2.1 Project Location The Kitts Corner property is an approximately 22.9-acre site located southwest of the intersection of S 336th Street and Pacific Highway S in Federal Way, Washington (Figure 1). The property consists of four parcels. King County Tax Parcel numbers are 2021049070, 2021049001, 2021049072 and 2021049004. The Public Land Survey System location is Section 29, Township 21 North, Range 4 East, Willamette Meridian. 2.2 Project Background The Kitts Corner Site was originally part of a previously proposed development called The Federal Way Village Master Plan. During the permitting for that project, on -site critical areas were delineated and rated by others (see the Wetland Delineation Report for Federal Way Village prepared by Raedeke Associates, Inc., dated 5 September 2006; and the Wetland Assessment of the Kitts Corner Property prepared by Raedeke Associates, Inc., dated 7 September 2004). The original project site consisted of multiple parcels and has been divided by a boundary line adjustment (BLA). The Kitts Corner Multi -family project represents the western half of the original Federal Way Village project site, west of the BLA line. 2.2.1 Original Proposed Development The approved Federal Way Village Master Plan proposed a mixed -use office, commercial, and residential development which originally included a 95-unit zero -lot -line townhouse development proposed for the RM-2400-zoned portion of the site. The original development proposal for the Federal Way Village project included both permanent wetland and wetland buffer impacts. None of these impacts have occurred since no development has yet been constructed in association with the Federal Way Village Master Plan. However, in anticipation of the impacts to Wetlands 3 and 4 (on the east portion of the 44-acre site, not part of the current project), mitigation for the proposed 0.3 acres of wetland fill has already been constructed in the form of 0.9 acres of wetland creation within the S 336th Street Regional Stormwater Facility constructed south of Wetland 2. The S 336th Street Regional Stormwater Facility was constructed by the 4 March 2014 Copyright © 2013 Talasaea Consultants, Inc. 1422 Kitts Corner Wetland Buffer Mit Rpt-3 (9Jul2014).docx Page 1 Kitts Corner Multi -Family Wetland Buffer Mitigation Plan City of Federal Way as part of the May 1996 Settlement Agreement and Covenant referenced below. A portion of the S 336th Street Regional Stormwater Facility, including the existing wetland mitigation, is located on the south portion of the Kitts Corner Multifamily site. However, it should be noted that this existing mitigation does not apply to any of the proposed wetland buffer impacts described later in this report, which are associated with the current Kitts Corner Multifamily development proposal. However, other development guidelines and conditions, as established in the 25 January 2008 Process III approval for the Federal Way Village Master Plan, as well as development conditions established in the May 1996 Settlement Agreement and Covenant, do apply to the current proposed development. Prior approvals and agreements for the Federal Way Village Master Plan that are relevant to the Kitts Corner Multi -family development include: ■ Settlement Agreement and Covenant between Campus Gateway Associates and the City of Federal Way, effective 15 May 1996, King County recording no. 9704211043. ■ Comp Plan Amendment and Conditional Rezone for Kitts Corner, ordinance no. 05-490, approved 6/16/05 • Process III approval of the Federal Way Village Master Plan, approved 25 January 2008 • Extension of the Process III approval for the Federal Way Village Master Plan extending the Approval through 31 January 2014, granted 1 February 2012, and ■ Design guidelines established in the document entitled "A Development Plan for Village at Federal Way". 2.3 Critical Areas 2.3.1 Wetlands The Site contains two wetlands designated as Wetland 1 and Wetland 2 (Sheet W1.0). Both wetlands are rated as Category II wetlands with 100-foot buffers. Wetland 1 is located in the northwest portion of the site and is approximately 2 acres in size and is classified as a palustrine, aquatic bed, rooted vascular (PAB3); palustrine, emergent, persistent (PEM1); and palustrine, scrub -shrub, broad-leaved deciduous (PSS1) wetland. Wetland 2 is located on the east portion of the site and is approximately 2.46 acres in size and is classified as a palustrine, forested, broad-leaved deciduous (PFO1) wetland. There is also one stream on the site which flows north to south through Wetland 2. This stream is named West Hylebos Tributary 0014A, which was rated as a "major" stream by the City of Federal Way's 2002 stream inventory. 2.3.2 Existing Buffer Conditions Talasaea conducted two site investigations to evaluate the existing buffer conditions and to locate acceptable routes for the proposed trails. We defined three unique buffer conditions (see Sheet W1.0 in Appendix A). These are further described below: 1. MIXED FOREST: The northeast and inner eastern portion of the buffer for Wetland 1 and the northwest and inner western portion of the buffer for Wetland 2 consist of mixed forest consisting mainly of black cottonwood and red alder with an understory of small trees, shrubs, and grasses. Some areas are lacking a shrub component and are mostly grass species. 2. MATURE CONIFEROUS FOREST: The outer portions of both buffer areas contain a very dense mature Douglas fir forest with a typical mid -canopy and understory of native large shrubs and groundcover species including: vine maple, red elderberry, salal, and sword fern. 3. OPEN AREAS: The northern central portion of the buffer for Wetland 1 is primarily open and vegetated with a mix of non-native/invasive shrubs and grasses. Non- 9 July 2014 Copyright© 2014 Talasaea Consultants, Inc. 1422 Kitts Corner Wetland Buffer Mit Rpt-3 (9Jul2014).docx Page 2 Kitts Corner Multi -Family Wetland Buffer Mitigation Plan native/invasive species include: Himalayan blackberry and Canada thistle with some Scot's broom. CHAPTER 3. PROPOSED DEVELOPMENT 3.1 Project Description DevCo plans to develop the Kitts Corner Multifamily project with 15 multi -family buildings (see Sheet W1.1 in Appendix A). The site will also be developed with required parking and drive isles, paved pedestrian walkways, landscaping, open space/recreation areas, a recreation building and pool, and utility infrastructure. The main access to the site will be off of S 336th Street. A secondary access will be provided out to Pacific Highway S at the southeast portion of the site. See the project narrative prepared by CPH consultants for more detailed information about the proposed project elements. The City Federal Way Revised Code (FWRC) 19.205.040 requires 400 square feet (sf) per unit of "common recreation open space useable for many activities" be provided. The proposed site plan includes 216 units for a total of 86,400 sf of required common recreational open space. DevCo is proposing to provide 39,679 sf of the required open space in the outer portions of the wetland buffer areas. In order to allow these buffer areas to be counted towards common recreational open space, buffer enhancements that at a minimum provide some manner of enjoyment to the residents, must be provided. Overall, approximately 10.3 acres (45 percent) of the Site will be developed with apartments, recreation facilities, open space, roads, parking and sidewalks. The remaining 12.6 acres (55 percent) of the Site will be permanently protected in two critical area tracts. 3.2 Stormwater Management The proposed project will manage stormwater runoff using several methods. The design of the stormwater management system will comply with City of Federal Way surface water standards, which include the 2009 King County Surface Water Design Manual (KCSWDM) and the City of Federal Way addendum to the KCSWDM. See Civil Plans and the Technical Information Report prepared by CPH Consultants for more information. Water Quality: Enhanced water quality treatment is required per the City of Federal Way Water Quality Applications Map because this is a multi -family development. Enhanced water quality treatment for pollution -generating surfaces (e.g., parking lot and drive isles) will be provided through the use of a two -facility treatment train. Rooftop runoff does not require water quality treatment because roof surfaces are considered to be non -pollution generating. However, for practical reasons, some of the rooftop runoff will be collected, combined, and treated with the runoff from pollution -generating surfaces. Where feasible, runoff from select buildings will be collected separately and fully dispersed into the wetland buffers via dispersion trenches. Runoff from the interim access road to SR-99 will be directed to one of two bioswales/raingardens for water quality treatment before being discharged to the Wetland 2/West Hylebos Tributary buffer. Flow Control: The Project Site is located in a City of Federal Way conservation flow control area (Level 2). However, as part of the 2006 Settlement Agreement and Covenant between Campus Gateway Associates (et. al.) and the City of Federal Way (KC Rec. No. 9704211043), the South 336th St. Regional Detention Facility has been sized assuming maximum build -out conditions in the watershed, and is designed to serve the flow control requirements of the Kitts Corner site. After water quality treatment, the majority of the stormwater runoff from the site will be discharged directly 9 July 2014 Copyright © 2014 Talasaea Consultants, Inc. 1422 Kitts Corner Wetland Buffer Mit Rpt-3 (9Jul2014).docx Page 3 Kitts Corner Multi -Family Wetland Buffer Mitigation Plan to this facility immediately south of the site. One exception will be clean rooftop runoff from select buildings. As mentioned above, this runoff will be directed to dispersion trenches in the wetland buffers. Two trenches will be located along the perimeter of the Wetland 2 buffer and 3 trenches will be located along the perimeter of the Wetland 1 buffer. The other exception will be runoff from the interim access road, which will flow through one of two raingardens prior to being discharged to the Wetland 2/West Hyleblos Tributary #0014A buffer north of the detention facility (the West Hylebos Tributary #0014A eventually flows into the detention facility). • Existing Off -Site Runoff: In addition to new runoff generated on site, there are two sources of existing off -site runoff that are currently discharged to the Wetland 1 buffer on site. One is from a small basin on the property to the west, and another is from the existing storm drainage system in S 336th Street. In order to maintain existing drainage patterns, both of these existing sources will continue to discharge to the Wetland 1 buffer via a new outfall in the buffer perimeter directly north of Wetland 1. The runoff from the basin to the west is from undeveloped land and thus does not require water quality treatment, and the runoff from the storm system under S 336th Street is already treated prior to being discharged on site. 3.3 Assessment of Development Impacts No impacts to the wetlands are proposed with this Project. The Project will be constructed, for the most part, outside of the buffers for Wetlands 1 and 2. However, the project will result in some minor intrusions into the buffers for Wetlands 1 and 2 (Sheet W1.1). These intrusions include: 1) temporary impacts from site construction activities, including site grading, retaining wall construction, and dispersion trench installation in the outer buffer perimeter, and 2) minor improvements in the form of two soft -surface pedestrian trails and associated viewpoints (the trails are required by the City of Federal Way to provide for useable open space in the buffer areas). These minor intrusions are described in more detail below. 3.3.1 Temporary Impacts from Site Construction Many of the constructed elements of the Project will be located adjacent to wetland buffers in order to maximize the density of the site per MR zoning requirements. Some temporary impacts to wetland buffers will occur in order to tie proposed grades into existing grades and to provide 1 sufficient working area for the construction of retaining walls, buildings, dispersion trenches, ! parking lots, and other project elements. All temporary buffer impacts will be the minimum necessary to construct the project infrastructure. In total, construction of the Project will result in approximately 6,919 sf of temporary impacts to the outer edges of both Wetlands 1 and 2 buffers. Temporary buffer impacts to Wetland 1 will result from construction of a retaining wall along the north wetland buffer boundary and grading impacts along the eastern wetland buffer boundary. The wall will only result in temporary buffer impacts approximately 2 feet wide at the toe of the wall. The grading impacts will average approximately 2-3 feet wide on the east edge of the buffer in most areas, and will extend into the buffer a maximum of approximately 10 feet in only two places. In addition, a dispersion trench and stormwater outfall will encroach into the buffer approximately 20 feet in two places along the north edge of the buffer. Temporary buffer impacts to Wetland 2 will result from grading all along the west edge of the buffer, as well as from the installation of two stormwater dispersion trenches at the edge of the buffer. The grading impacts will only encroach about 1 to 3 feet into the buffer. The buffer J encroachment associated with the two dispersion trenches will extend out approximately 20 feet into the buffer. See Sheet W1.1 for a plan depicting the extent of the temporary buffer impacts 9 July 2014 Copyright © 2014 Talasaea Consultants, Inc. 1422 Kitts Corner Wetland Buffer Mit Rpt-3 (9Jul2014).docx Page 4 Kitts Corner Multi -Family Wetland Buffer Mitiqation Plan from construction. All buffer areas disturbed by these intrusions will be fully restored and planted after construction is complete. 3.3.2 Pedestrian Trails and Viewpoints Two soft -surface pedestrian trails will be constructed through portions of the buffers for Wetlands 1 and 2 as part of the passive recreation open space amenities proposed for the Project. The trail in the Wetland 1 buffer will traverse the north and east sides of the buffer with three access points from the adjacent paved pedestrian promenade walk. A raised overlook platform will be constructed at the north end of the Wetland 1 buffer to providing viewing into the wetland. Two ground -level viewpoints will also be constructed along the trail. The trail in the Wetland 2 buffer will begin in the northwest portion of the buffer adjacent to Building G and will traverse southward, connecting back to the paved sidewalk north of Building H. The Wetland 2 trail corridor will have two access points, one each at the north and south ends, and two ground - level viewpoints. All viewpoints and the raised overlook platform will have a bench, interpretive sign, and trash receptacle. The design of the interpretive signs will provide informational/interpretive text and graphics describing different aspects of forested wetland and buffer functions. The trails have been designed to minimize impacts to the buffers. After reviewing the topography in the southern portion of the buffer for Wetland 2, it was determined that constructing a trail on the fairly steep slopes in this area would not be possible. In addition, the existing coniferous forest is quite dark and dense and safety also became a factor in deciding to relocate the trail out of this area as originally presented to the City. This will also help minimize potential impacts to the buffer for West Hylebos Tributary #0014A, which runs through Wetland 2. The main, larger loop of the trail is now proposed for the Wetland 1 buffer. Some small shrubs and groundcover will need to be cleared and grubbed along the trail routes, but the trails will be located to avoid all significant trees and to minimize impacts to native vegetation. Trail surfacing will consist of wood chips. The proposed pedestrian trails and viewpoints will be defined by a 2-board fence (or similar type of fence) on the inside edges of the trails that will discourage human and domestic animal intrusion into the wetlands. Use of fencing should not impede movement of wildlife between buffer and wetland habitats. Approximately 6,123 sf of buffer area will be needed to construct the trails and viewpoints. Total proposed impacts to the wetland buffers are 13,042 sf as shown in Table 1 Table 1. Summary of Wetland Buffer Minor Intrusions Minor Buffer Intrusions Area (sf) Pedestrian Trails and Viewpoints Temporary Impacts from Construction Total: 6,123 6,919 13,042 3.4 Process III Buffer Modification As described above, minor improvements proposed within the wetland buffers include: 1) temporary impacts from site construction, and 2) pedestrian trails and viewpoints. These minor improvements may be reviewed and approved through Process III if the criteria defined in FWRC 19.175.040(4) is met. These criteria (a through e) are reiterated below, followed by a response explaining how the proposed improvements are consistent with each criterion. 9 July 2014 Copyright © 2014 Talasaea Consultants, Inc. 1422 Kitts Corner Wetland Buffer Mit Rpt-3 (9Jul2014).docx Page 5 Kitts Corner Multi -Family Wetland Buffer Mitiqation Plan 3.4.1 Process III Approval Criteria for Minor Improvements for Temporary Construction Impacts a) It will not adversely affect water quality; The clearing and grading work and the installation of the dispersion trenches are not likely to adversely affect water quality. These intrusions will be located within the outer perimeter of the buffers for Wetlands 1 and 2. No toxic materials will be placed in the buffers as part of this work. Any fill associated with the grading will be cut from other portions of the site or will be clean imported fill, and the dispersion trenches will receive only clean rooftop runoff to be dispersed and infiltrated within the buffer. Temporary erosion and sediment control (TESL) measures, such as silt fencing at the clearing and grading limits, will be installed pursuant to the TESC plan prepared by the civil engineer, which will protect the buffers and wetlands from construction site runoff. All disturbed buffer areas will be fully stabilized and revegetated with native trees and shrubs once construction is complete, which will prevent any long-term impacts to water quality. b) It will not adversely affect the existing quality of the wetland's or buffer's wildlife habitat; The clearing and grading work and the installation of the dispersion trenches are not likely to adversely affect the existing quality of the wetland's or buffer's wildlife habitat. All disturbed buffer areas (with the exception of the dispersion trenches) will be fully restored and revegetated with native trees and shrubs with the goal of achieving equal or better wildlife habitat. The dispersion trenches will not be planted and will be maintained vegetation -free to ensure their proper functioning. c) It will not adversely affect drainage or stormwater retention capabilities; The clearing and grading work and the installation of the dispersion trenches are not likely to adversely affect the drainage or stormwater retention capabilities of the on -site wetlands or buffers. The installation of the dispersion trenches and the minor grading at the buffer perimeters will not result in any impediments or significant changes to the existing drainage patterns within the wetlands or the buffers, and the existing surface drainage patterns will be maintained. No depressional areas that currently provide stormwater detention functions will be filled. Discharge from the dispersion trenches will follow the existing surface drainage patterns within the buffer. d) It will not lead to unstable earth conditions nor create erosion hazards; and The clearing and grading work and the installation of the dispersion trenches are not likely to lead to unstable earth conditions or erosion hazards. All proposed grading will have slopes not to exceed 3:1. All disturbed soil areas will be temporarily stabilized with 3 inches of mulch or other methods approved by the TESC plan, and will be permanently stabilized and planted with native trees and shrubs once construction is complete. The dispersion trenches are designed to disperse stormwater flows over a wide area so as not create any concentrated surface flows that might cause erosion. The stormwater dispersion trenches are also designed to directly infiltrate the majority of the discharge for all but the largest of flows. Larger flows may result in some surface sheet flow from the dispersion trenches if they completely fill with water, but they are designed to be of sufficient length to ensure that any surface sheet flows will be sufficiently dispersed. e) 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. The clearing and grading work and the installation of the dispersion trenches will not be materially detrimental to any other property in the area of the project site nor to the City as a whole. There will be no impacts from these proposed improvements beyond the 9 July 2014 Copyright © 2014 Talasaea Consultants, Inc. 1422 Kitts Corner Wetland Buffer Mit Rpt-3 (9Jul2014).docx Page 6 Kitts Corner Multi -Family Wetland Buffer Mitigation Plan immediate area of the work. As discussed above, the impacts will primarily be temporary and disturbed buffer areas will be fully restored and planted. No open space will be lost as a result of the proposed work. 3.4.2 Process III Approval Criteria for Minor Improvements for Pedestrian Trails and Viewpoints a) It will not adversely affect water quality; The proposed trails and viewpoints will be constructed using wood chips as a surfacing material. By using wood chips, the trail will not introduce any synthetic or otherwise harmful materials that could leach out pollutants or other potentially toxic chemicals, and no additional runoff will be created. The trail will be maintained using additional layers of wood chips, as necessary, and simple hand removal of weeds. Additionally, no trees will be removed to construct the trail. We expect to remove some small shrubs and groundcover plants in some areas to align the trail, but vegetation removal will be the minimum necessary, and no grading, excavating, or compacting of native topsoil will occur during the trail construction. The water quality functions of the buffer will not be diminished as a result of the proposed trail construction. b) It will not adversely affect the existing quality of the wetland's or buffer's wildlife habitat; The proposed trail and viewpoints will not encroach upon or disturb any wetland habitat. Wildlife habitat associated with the on -site wetland areas is not likely to be adversely affected by the trails and viewpoints in any significant way. The proposed trail routes will avoid large trees and generally will stay within areas currently vegetated with small shrubs and/or groundcover. Avoiding damage to large trees and shrubs will help preserve the quality of wildlife habitat within the upland buffer area. The footprint of the trails (approximately 6,123 so will be very small compared to the total on site area, thus the overall impact to the existing habitat in the buffers should not be significant. In addition, the trails will be located only within the outer 50 percent of the buffer, which will help avoid disturbance to the more sensitive habitat closer to and within the wetlands. c) It will not adversely affect drainage or stormwater retention capabilities; The proposed trails and viewpoints will be constructed out of wood chips and will not entail any significant grading, excavating, or compacting of native topsoil within the buffer, thus the trails are not likely to adversely affect the drainage or stormwater retention capabilities of the buffer. d) It will not lead to unstable earth conditions nor create erosion hazards; and The trails and viewpoints construction will not involve any additional grading, excavating, or compacting of native topsoil. The preliminary trail alignments shown on the plans will be refined and laid out in the field to generally follow the contours of the land, which will help prevent unstable earth conditions or erosion hazards. The use of wood chips as the surfacing material will prevent stormwater from becoming concentrated and directed towards hydrologic low areas. Thus, the proposed wood chip trails and viewpoint locations are not anticipated to create any erosion hazards. e) 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. The proposed trails and viewpoints will be constructed entirely on property owned by the Applicant and will not directly affect any adjacent properties. As mentioned in our response to Item (d), no significant grading, excavation, or compaction of native topsoil will occur during construction of the trails. No existing native trees will be removed, which could increase the risk of soil erosion through loss of canopy coverage and root 9 July 2014 Copyright © 2014 Talasaea Consultants, Inc. 1422 Kitts Corner Wetland Buffer Mit Rpt-3 (9Jul20l4).docx Page 7 Kitts Corner Multi -Family Wetland Buffer Mitigation Plan mass. The proposed wood chip trails and viewpoints will not alter the local hydrology or geologic stability of the immediate area, and therefore pose no appreciable risk of damage to other properties in the general area, or to the city as a whole. In addition, no open space will be lost as a result of this proposal. The installation of the trails will in fact enhance the value of the open space on the project site by making an approximately 39,679 sf portion of the buffers accessible to the development's residents as passive open space where they can interact with and experience the natural environment without causing significant impact. CHAPTER 4. PROPOSED MITIGATION 4.1 Wetland Buffer Mitigation Talasaea has prepared the following buffer mitigation plan to address and remedy impacts to wetland buffers resulting from the proposed site development. See Sheets W1.1 - W3.0 in Appendix A. 4.1.1 Buffer Restoration for Temporary Construction Impacts (Area A) To mitigate for temporary impacts from site construction the project will restore 6,919 sf of buffer area. Mitigation measures will include: ■ Placing 9" of topsoil or amending existing soils to create 9" of topsoil in graded and/or grubbed buffer areas; • Placing 3 inches of medium bark mulch over all disturbed soil (graded and/or grubbed) in buffer areas; and • Fully revegetating disturbed buffer areas with a variety of native deciduous and evergreen trees, shrubs and groundcovers. 4.1.2 Buffer Enhancement in Passive Open Space Areas Approximately 86,400 sf of "common recreational open space useable for many activities" is required in order for the project to meet City zoning code requirements (400 sf of open space per unit is required). In order to meet this requirement, approximately 39,679 sf of wetland buffer will be designated as passive open space (see Sheet W1.1). In order to meet the requirements for common recreational open space, the City of Federal Way requires that the buffer areas designated as passive open space be enhanced in order to provide value as an open space amenity for residents. Three buffer enhancement areas have been defined which will require different levels of enhancement depending on existing vegetation conditions (see Section 2.3.2 for a description of existing buffer conditions). The general goal of the buffer enhancement will be to increase habitat value and ecological functions by removing invasive species, installing habitat features such as stumps, down logs, and bird nest boxes where feasible, and increasing habitat structural diversity and plant species diversity by interplanting existing native vegetation with additional native evergreen and deciduous trees, shrubs, and groundcover. In addition to providing a more valuable ecological amenity for residents, these enhancements will provide general aesthetic enhancement as well (e.g., several species of flowering native shrubs will be planted). Total buffer enhancement will equal approximately 39,679 sf. See Sheet W1.1 for a graphical depiction of the buffer enhancement areas. These buffer enhancement areas are described in more detail below: Area B Buffer Enhancement — Open Areas (9,156 s This is an open, unforested area which mainly consists of grass species and non-native and invasive shrubs. Buffer enhancement in this area will consist of the following measures: ■ Grub entire area by hand and/or machine to remove all invasive/non-native species and remove any trash and debris; 9 July 2014 Copyright© 2014 Talasaea Consultants, Inc. 1422 Kitts Corner Wetland Buffer Mit Rpt-3 (9Jul2014).docx Page 8 Kitts Corner Multi-Familv Wetland Buffer Mitigation Plan Restore disturbed soils with compost or imported topsoil, if necessary; Install habitat features such as down logs, stumps, and snags with swallow nest boxes; • Stabilize disturbed soils with 3-inch depth of bark mulch; and • Revegetate entire area with a mix of native evergreen and deciduous trees, shrubs, and groundcover Area C Buffer Enhancement — Mixed Forest (7,102 s This area is currently vegetated by mixed, mostly deciduous forest with some native shrub understory. Buffer enhancement in this area will consist of the following measures: Grub out any invasive/non-native species by hand Enhance existing deciduous forest vegetation by planting coniferous trees and select shade -adapted native large shrubs and small trees to fill in mid -story and understory strata; and Install habitat features such as swallow nest boxes on existing trees, and large woody material such as stumps and down logs where existing native vegetation will not be disturbed. Area D Buffer Enhancement — Coniferous Forest 04 956 s This area is currently vegetated by dense, relatively mature coniferous forest (mostly Douglas fir) with a mid -story and understory of native small trees, shrubs, and groundcovers. Buffer enhancement in this area will consist of the following measures: • Enhance existing coniferous forest vegetation by planting select shade -adapted native large shrubs and small trees to fill in mid -story and understory strata; and • Install habitat features such as swallow nest boxes on select existing trees. 4.1.3 Critical Area Fencing A 2-board fence (or similar fence type) will be constructed along the inner edges of both pedestrian trails to prevent human intrusion into the wetlands. Additionally, the outer edge of the buffer adjacent to both wetlands will also be fenced with security fencing, to be determined by owner 4.1.4 Critical Area Signs Following construction completion, critical area signs, consistent with City of Federal Way requirements, shall be installed at the buffer boundaries every 100 feet. 4.2 Mitigation Goals, Objectives, and Performance Standards The primary goals of the mitigation plan are as follows: Restore the functions and values of the wetland buffer lost due to temporary impacts from site construction by restoring approximately 6,919 sf of buffer area, and Enhance buffer functions and values in approximately 31,214 sf of existing vegetated buffer area in order to provide a passive recreation amenity consistent with City guidelines and open space requirements. The mitigation plan will be evaluated through the objectives and performance standards outlined below. Mitigation monitoring will be performed by a qualified wetland biologist/ecologist. Obiective A: Restore 6,919 sf of buffer area temporarily impacted by construction and enhance approximately 31,214 sf of existing vegetated buffer area. Performance Standard Al At least 15 species of desirable native plants will be present in the buffer restoration and enhancement areas during the monitoring period. Percent survival of 9 July 2014 Copyright © 2014 Talasaea Consultants, Inc. 1422 Kitts Corner Wetland Buffer Mit Rpt-3 (9Ju12014).docx Page 9 Kitts Corner Multi -Family Wetland Buffer Mitigation Plan planted woody species must be at least 100% at the end of Year 1 (per contractor warranty), and at least 80% for each subsequent year of the monitoring period. Performance Standard A2 buffer restoration areas only) *: Native woody species (planted or volunteer) in the restored buffer areas shall achieve an average stem density of at least 0.03 stems per square foot by the end of Year 1 and an average stem density of at least 0.04 stems per square foot by the end of Year 3. Total percent aerial woody plant coverage in the restored buffer areas must be at least 35% by Year 4 and 50% by Year 5. Woody coverage may be comprised of both planted and recolonized native species; however, to maintain species diversity, at no time shall a single recolonized species (i.e., red alder) comprise more than 35% of the total woody coverage. There must be at least three native species providing at least 20% cover each, or four native species providing at least 15% cover each, or five native species providing at least 10% cover each of the total aerial woody plant coverage. Performance Standard A3: Invasive weedy species shall be less than 15 percent of total areal coverage for any year during the monitoring period within the buffer restoration and enhancement areas. These species include, but are not limited to, Scot's broom, Himalayan and evergreen blackberry, reed canarygrass, purple loosestrife, hedge bindweed, knotweed sp., and creeping nightshade. Additional species requiring control may be designated by the City or by Talasaea Consultants during the monitoring period. `Note: The coverage performance standard is not applicable to existing vegetated buffer enhancement areas because these areas already have 100% aerial coverage of woody plant material. 4.3 Buffer Mitigation Design 4.3.1 Topsoil & Mulch In all graded and grubbed buffer mitigation areas, existing soils shall be amended or topsoil imported to achieve a depth of 9 inches. 3 inches of bark mulch shall be placed over all disturbed soil areas. 4.3.2 Plantings A Plant Schedule that depicts the proposed species for the buffer restoration and enhancement areas is included on Sheet W3.0. Plant materials will consist of a combination of balled-and- burlapped (b&b) and container stock. Plant species have been chosen for a variety of qualities, including: adaptation to specific water regimes, value to wildlife, value as a physical or visual barrier, pattern of growth (structural diversity), and aesthetic values. Native tree, shrub, and groundcover species were chosen to increase both the plant structural and species diversity of the buffer mitigation areas, thereby increasing the value of the area to wildlife for food and cover. 4.3.3 2-Board Fence and Critical Area Signs Following plant installation, the contractor shall construct the 2-Board fence and install the Critical Area signs per the locations depicted on Sheet W1.1. 4.3.4 Interpretive Signs and Site Furnishings Talasaea shall prepare concepts for the interpretive signs and provide to the City for review. Upon review and approval, Talasaea shall work with a sign designer to have the signs finalized, produced, and installed. The signs shall be laminated, weather-proof, and UV resistant. A bench and trash receptacle will also be installed at each of the viewpoint locations. The benches and trash receptacles shall be selected by the owner, and shall be of quality and durability to withstand the existing forest environment. 9 July 2014 Copyright © 2014 Talasaea Consultants, Inc. 1422 Kitts Corner Wetland Buffer Mit Rpt-3 (9Jul2014).docx Page 10 IKitts Corner Multi -Family Wetland Buffer Mitigation Plan CHAPTER 5. CONSTRUCTION SEQUENCING 5.1 Mitigation Construction Sequence The following provides the general sequence of activities anticipated to be necessary to complete this mitigation project. Some of these activities may be conducted concurrently as the project progresses. 1. Conduct a site meeting between the Contractor, Talasaea Consultants, and the Owner's Representative to review the project plans, work areas, staging/stockpile areas, and material disposal areas. 2. Survey clearing/grading limits. 3. Flag existing trees and other vegetation to remain. 4. Install silt fencing, tree protection fencing (if required), and any other erosion and sedimentation control BMPs necessary for work in the project areas. 5. Complete site grading, retaining wall, and dispersion trench installation in buffer areas 1 per civil site development plans. 6. Grub out invasive species in buffer areas as shown on clearing and grubbing plan. 7. Place topsoil or soil amendments as required. 8. Install habitat features (snags, down logs, and stumps). 9. Mulch all graded/grubbed buffer areas. 10. Construct woodchip trail in buffer. 11. Complete site cleanup and install plant material as indicated on the planting plan. 12. Install 2-board fences and critical area signs. 13. Install benches, trash receptacles, and interpretive signs at viewpoints. 5.2 Post -Construction Approval Following mitigation construction completion Talasaea Consultants shall notify the City in writing to request a final site inspection for final construction approval. Once the City has approved of the mitigation construction the monitoring period shall commence. 5.3 Post -Construction Assessment Once construction is approved by the City, a qualified wetland ecologist or biologist from Talasaea Consultants shall conduct a post -construction assessment. The purpose of this assessment will be to establish baseline conditions at Year 0 of the required monitoring period. A Baseline Assessment report including "as -built" drawings will be submitted to the City. The as -built plans will identify and describe any changes in planting or other features in relation to the original approved plan. CHAPTER 6. MONITORING METHODS Performance monitoring of the mitigation areas will be conducted for a period of five years. Monitoring events will be conducted according to the schedule presented in Table 2 below. All monitoring will be performed by a qualified biologist or ecologist. 6.1 Reports J The reports will include: 1) Project Overview, 2) Mitigation Requirements, 3) Summary Data, 4) Maps and Plans, and 5) Conclusions. If the performance criteria are met, monitoring for the City will cease at the end of year five, unless objectives are met at an earlier date and the City Jaccepts the mitigation project as successfully completed. 9 July 2014 Copyright © 2014 Talasaea Consultants, Inc. 1422 Kitts Corner Wetland Buffer Mit Rpt-3 (9Ju12014).docx Page 11 Kitts Corner Multi -Family Wetland Buffer Mitiqation Plan Table 2. Projected Schedule for Performance Monitoring and Maintenance Events Year Date Maintenance Review Performance Monitoring Report Due to Agencies Year 0, As -built and Baseline Assessment Winter 2015 X X X 1 Spring 2015 X X X Fall 2015 X X 2 Spring 2016 X X Fall 2016 X X X 3 Spring 2017 X Fall 2017 X X X 4 Spring 2018 X Fall 2018 X X X 5 Spring 2019 X Fall 2019 X X X* *Obtain final approval to facilitate bond release from the City of Federal Way (presumes performance criteria are met). 6.2 Monitoring Methods Vegetation monitoring methods may include counts; photo -points; random sampling; sampling plots, quadrats, or transects; stem density; visual inspection; and/or other methods deemed appropriate by the permitting agencies and the biologist/ecologist. Vegetation monitoring components shall include general appearance, health, mortality, colonization rates, percent cover, percent survival, volunteer plant species, and invasive weed cover. Permanent vegetation sampling plots, quadrats, and/or transects will be established at selected locations to adequately sample and represent all of the plant communities within the mitigation project areas. The number, exact size, and location of transects, sampling plots, and quadrats will be determined at the time of the baseline assessment. Percent areal cover of woody vegetation (forested and/or scrub -shrub plant communities) will be evaluated through the use of point -intercept sampling methodology. Using this methodology, a tape will be extended between two permanent markers at each end of an established transect. Trees and shrubs intercepted by the tape will be identified, and the intercept distance recorded. Percent cover by species will then be calculated by adding the intercept distances and expressing them as a total proportion of the tape length. The established vegetation sampling locations will be monitored and compared to the baseline _j data during each performance monitoring event to aid in determining the success of plant establishment. Percent survival of shrubs and trees will be evaluated in a 10-foot-wide strip along each established transect. The species and location of all shrubs and trees within this area will be recorded at the time of the baseline assessment, and will be evaluated during each monitoring event to determine percent survival. J 6.3 Photo Documentation Locations will be established within the mitigation areas from which panoramic photographs will be taken throughout the monitoring period. These photographs will document general J appearance and relative changes within the plant communities. Review of the photos over time will provide a semi -quantitative representation of the success of the planting plan. Vegetation sampling plot and photo -point locations will be shown on a map and submitted with the baseline J assessment report and yearly performance monitoring reports. 6.4 Wildlife Birds, mammals, reptiles, amphibians, and invertebrates observed in the mitigation areas (either ! by direct or indirect means) will be identified and recorded during scheduled monitoring events, J 9 July 2014 Copyright© 2014 Talasaea Consultants, Inc. } 1422 Kitts Corner Wetland Buffer Mit Rpt-3 (9Ju12014).docx Page 12 Kitts Corner Multi -Family Wetland Buffer Mitigation Plan and at any other times observations are made. Direct observations include actual sightings, while indirect observations include tracks, scat, nests, song, or other indicative signs. The kinds and locations of the habitat with greatest use by each species will be noted, as will any breeding or nesting activities. 6.5 Site Stability Observations will be made on the stability of slopes in the mitigation areas. Any erosion or slumping of the slopes will be recorded and corrective measures will be taken. CHAPTER 7. MAINTENANCE AND CONTINGENCY Regular maintenance reviews will be performed according to schedule presented in Table 2 to address any conditions that could jeopardize the success of the mitigation project. Following maintenance reviews by the biologist or ecologist, required maintenance on the site will be implemented within ten (10) business days of submission of a maintenance memo to the maintenance contractor and permittee. Established performance standards for the project will be compared to the yearly monitoring results to judge the success of the mitigation. If, during the course of the monitoring period, there appears to be a significant problem with achieving the performance standards, the permittee shall work with the permitting agencies to develop a Contingency Plan in order to get the project back into compliance with the performance standards. Contingency plans can include, but are not limited to, the following actions: additional plant installation, erosion control, modifications to hydrology, and plant substitutions of type, size, quantity, and/or location. If required, a Contingency Plan shall be submitted by December 315t of any year when deficiencies are discovered. The following list includes examples of maintenance (M) and contingency (C) actions that may be implemented during the course of the monitoring period. This list is not intended to be exhaustive, and other actions may be implemented as deemed necessary. During year one, replace all dead woody plant material (M). Water all plantings at a rate of 1" of water every week between June 15 — October 15 during the first two years after installation, and for the first two years after any replacement plantings (C & M). Replace dead plants with the same species or a substitute species that meets the goals and objectives of the mitigation plan, subject to Talasaea and agency approval (C). • Re -plant area after reason for failure has been identified (e.g., moisture regime, poor plant stock, disease, shade/sun conditions, wildlife damage, etc.) (C). • After consulting with County staff, minor excavations, if deemed to be more beneficial to the existing conditions than currently exists, will be made to correct surface drainage patterns (C). Remove/control weedy or exotic invasive plants (e.g., Scot's broom, reed canarygrass, Himalayan blackberry, purple loosestrife, Japanese knotweed, etc.) by manual or chemical means approved by permitting agencies. Use of herbicides or pesticides within the mitigation area would only be implemented if other measures failed or were considered unlikely to be successful, and would require prior agency approval. All non- native vegetation must be removed and disposed of off -site. (C & M). • Weed all trees and shrubs to the dripline and provide 3-inch deep mulch rings 24 inches in diameter for shrubs and 36 inches in diameter for trees (M). ■ Remove trash and other debris from the mitigation areas twice a year (M). 9 July 2014 Copyright © 2014 Talasaea Consultants, Inc. 1422 Kitts Corner Wetland Buffer Mit Rpt-3 (9Jul2014).docx Page 13 Kitts Corner Multi -Family Wetland Buffer Mitigation Plan Selectively prune woody plants at the direction of Talasaea Consultants to meet the mitigation plan's goal and objectives (e.g., thinning and removal of dead or diseased portions of trees/shrubs) (M). Repair or replace damaged structures including weirs, signs, fences, or bird boxes (M). CHAPTER 8. PERFORMANCE AND MAINTENANCE BOND The applicant shall post a bond or other financial guarantee as required by the City to ensure that the mitigation plan is fully implemented, monitored, and maintained through the end of the required monitoring period. Financial guarantees shall meet the requirements of FWRC 19.150.060 and FWRC Chapter 19.25. Per FWRC 19.25.040(2), for a performance bond, the amount shall be 120 percent of the cost of the work or improvements covered by the bond, and for a maintenance bond, the amount shall be 30 percent of the cost of replacing materials covered by the bond. CHAPTER 9. SUMMARY The Kitts Corner Multifamily project will involve the construction of 15 multi -family buildings containing a total of 216 units on an approximately 22.9-acre MR -zoned site located in the City of Federal Way. The site will also be developed with required parking and drive isles, a pedestrian promenade and other paved walkways, landscaping, open space areas, a recreational building and pool, and utility infrastructure. The main access to the site will be off of S 336th Street. A secondary access will be provided out to Pacific Highway S at the southeast portion of the site. Overall, approximately 10.3 acres (45 percent) of the Site will be developed with apartments, recreation facilities, open space, roads, parking, and sidewalks. The remaining 12.6 acres (55 percent) of the Site will be permanently protected in two critical area tracts as wetland and wetland/stream buffer. No impacts to the wetlands are proposed with this Project. The Project will be constructed, for the most part, outside of the buffers for Wetlands 1 and 2. However, the Project will result in some minor intrusions into the buffers for Wetland 1 and Wetland 2. These intrusions include temporary impacts due to the construction of retaining walls near the buffer perimeters, installation of five dispersion trenches in the outer edges of the buffers, and general site grading at the outer edges of the buffers. In total, there will be approximately 6,919 sf of temporary construction impacts to the outer edges of both the Wetland 1 and 2 buffers. These intrusions also include minor improvements in the form of two soft -surface pedestrian trails within the outer 50 percent of the buffers. The trails will be located to avoid all significant trees and to minimize impacts to native vegetation, and will be surfaced with woodchips. Approximately 6,123 sf of buffer area will be needed to construct the trails. To mitigate for temporary impacts from site construction, the project will restore approximately 6,919 sf of buffer area. Mitigation measures will include importing topsoil or amending disturbed soils with compost as necessary, mulching all disturbed soils, and fully revegetating disturbed buffer areas with a variety of native deciduous and evergreen trees, shrubs, and groundcovers. In addition to buffer restoration, buffer enhancement will also be provided in order to meet the City requirements for using 39,679 sf of buffer as common recreational open space. The buffer areas designated as passive open space will be enhanced in order to provide value and enjoyment to residents as an open space amenity. Three buffer enhancement areas have been defined which will require different levels of enhancement depending on existing vegetation 9 July 2014 Copyright © 2014 Talasaea Consultants, Inc. 1422 Kitts Corner Wetland Buffer Mit Rpt-3 (9Ju12014).docx Page 14 Kitts Corner Multi -Family Wetland Buffer Mitigation Plan conditions. The general goal of the buffer enhancement will be to increase habitat value and ecological functions by removing invasive species, installing habitat features such as stumps, -� down logs, and bird nest boxes where feasible, and increasing habitat structural diversity and plant species diversity by interplanting existing native vegetation with additional native evergreen and deciduous trees, shrubs, and groundcover. Other critical area protection measures will include fencing and signage. A 2-board fence (or similar fence type) will be constructed along the inner edges of both buffer trails to prevent human intrusion into the wetlands. Additionally, the outer edge of the buffer adjacent to both -� wetlands will also be fenced with security fencing, to be determined by owner. Critical area signs, consistent with City of Federal Way Design Guidelines and code requirements, shall be installed at the buffer boundary every 100 feet. All of the restored and enhanced buffer areas will be maintained and monitored for five years to ensure compliance with the stated goals, objectives, and performance standards approved by the City. The Applicant shall also post a bond or other financial guarantee as required by the City to ensure that the mitigation plan is fully implemented, monitored, and maintained through the end of the required monitoring period. 9 July 2014 Copyright © 2014 Talasaea Consultants, Inc. 1422 Kitts Corner Wetland Buffer Mit Rpt-3 (9Ju12014).docx Page 15 Kitts Corner Multi -Family Wetland Buffer Mitigation Plan J CHAPTER 10. REFERENCES City of Federal Way. n.d. "A Development Plan for Village at Federal Way." Federal Way, WA: City of Federal Way. Code Publishing Company. 2013. "Federal Way Revised Code." Code Publishing Company. December 3. Accessed March 2014. http://www.codepublishing.comN\IA/FederalWay/. CPH Consultants. 2014. Technical Information Report for Kitts Corner Multi -Family. Kirkland, WA: CPH Consultants. Hitchcock, C. Leo, Arthur Cronquist, Marion Owensby, and J. W. Thompson. 1969. Vascular Plants of the Pacific Northwest. Seattle: University of Washington Press. Hitchcock, C.L., and A. Cronquist. 1973. Flora of the Pacific Northwest. University of Washinton Press. Lichvar, R.W. 2012. The National Wetland Plant List. ERDC/CRREL TR-12-11, Hanover, NH: U.S. Army Corps of Engineers, Cold Regions Research and Engineering Laboratory. http://acwc.sdp.sirsi.net/client/search/asset:asset?t:ac=$N/1 012381. Raedeke Associates, Inc. 2004. Wetland Assessment of the Kitts Corner Property. Seattle, WA: Raedeke Associates, Inc. Raedeke Associates, Inc. 2006. Wetland Delineation Report for Federal Way Village. Seattle, WA: Raedeke Associates, Inc. 2006. "Settlement Agreement and Covenant between Campus Gateway Associates (et. al.) and the City of Federal Way." May 15. 9 July 2014 Copyright © 2014 Talasaea Consultants, Inc. 1422 Kitts Corner Wetland Buffer Mit Rpt-3 (9Jul2014).docx Page 16 Kitts Corner Multi -family Wetland Buffer Mitigation Plan FIGURES Figure 1: Vicinity Map and Driving Directions 9 July 2014 Copyright© 2014 Talasaea Consultants, Inc. 1422 Kitts Corner Wetland Buffer Mit Rpt-3 (9Jul20l4).docx Figures i I F1F-a! SW 3201h St S 3201,h St +'+'•_� 1-tb; ar, Y — V) I r t R Fie IC M Er, �j FROJEGT SITE CelFlarklcr; Park r Fig iera� Pla. S .r City HAL a > > i WAY Ilun�ar, a c, h St SW Ca S 320th St r7 U � ti Gs D is ••- S W C�� = [? [e- E ym ,<, in 1�That^}ac. �nrr :t EIer*!P 'a; S 343th St IMAGE SOURCE: GOOGLE MAPS, NV4Vq.MAPS.000GLE.GOM (AGGESSED Ici DEG 2013) DRIVING DIREGTIONS: I) FROM SEATTLE TAKE INTERSTATE 5 SOUTH TOWARD FEDERAL WAY 2) TAKE EXIT 143 AND CONTINUE RIGHT ONTO S 320TH STREET 3) TURN LEFT ONTO PAGIFIG HHY; HA-cia S 4) TURN RIGHT ONTO S 336TH STREET (b) ARRIVE AT DESTINATION ON LEFT S 320th S FIGURE # I (9 TALASAEA CONSULTANTS, INC. VIGINITI' MAP � DIREGTIONS Resource & Environmental Planning KITTS CORNER MULTIFAMILY 15020 Bear Creak Read NorLheasL FEDERAL HAY, HASHINOTON Woodinvi Ile, Wa shingLon 98077 Bus (,1'25)861-7550 — Fax (125)861-75.19 Not F ishu ro NORTH DESIGN DRAWN PROJECT AO ABS 1422 SCALE NTS DATE I 12-Ia-2015 REVISED © Copyright - Talasaea ConsultanLs, INC. Kitts Comer Multi -family Wetland Buffer Mitigation Plan APPENDIX A Wetland Buffer Mitigation Plan Sheets (22"x34" full size plan sheets) Sheet W1.0: Existing Conditions Plan Sheet W1.1: ~� Proposed Site Plan, Impacts & Mitigation Overview Plan Sheet W1.2: Clearing, Grubbing, & Habitat Feature Plan Sheet W1.3: Details Sheet W2.0: Planting Plan Sheet W2.1: Planting Plan Sheet W3.0: Plant Schedule, Details, & Notes Sheet W3.1: Planting Specifications J _ 9 July 2014 Copyright © 2014 Talasaea Consultants, Inc. 1422 Kitts Corner Wetland Buffer Mit Rpt-3 (gJul20l4).docx Appendix A