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15-10271725,E ry Jim Ferrell, Mayor July 1, 2015 Mr. Tony Douchette City of Federal Way — PW/SWM 33325 8th Avenue South Federal Way, WA 98003 FILE Re: File #15-102717-00-AD; Pacifc Highway Dispersion Trench, South 356th Dear Mr. Doucette: The Community Development Department approves your request to install a stormwater dispersion trench on a Surface Water Management (SWM) property located at 3580 Pacific Highway South. The trench is associated with the SR 99 Phase V capital improvement project that will begin construction next year. As provided in your memo, the trench will be located within a wetland buffer on the SWM property. The scope of work includes two 50-foot long and 2.5-foot wide dispersion trenches that will be approximately 3-feet deep and filled with gravel. The alignment will be adjusted during installation to avoid trees as much as possible. Disturbed areas caused by construction will be seeded with a native seed mix. DIRECTOR AUTHORIZATION Recently passed Federal Way Ordinance #15-757 provides the Director of Community Development authority to issue a partial exemption to environmentally critical areas regulations under interim code citation Federal Way Revised Code (FWRC) 19.145.120(1) for essential public facilities, such as state transportation facilities. The intrusion into the wetland buffer is the minimum necessary to mitigate stormwater impacts from the Phase V capital project. Further, the SWM Division will mitigate construction impacts by avoiding tree removal when possible and replanting the areas disturbed by the trench construction. CLOSING Please contact Senior Planner Matt Herrera at matt.herrera@.cityoffederal,,vay.com, or 253-825-2638 with any questions regarding this authorization to proceed. Sincerely, Michael A. Morales Director of Community Development c: Matt Herrera, Senior Planner Doc. I.D. 69915 33325 8th Avenue South, Federal Way, WA 98003-6325 o (253) 835-7000 • www.cityoffederalway.com ,fib 15-(oZ-7('-� MEMORANDUM Public Works Jim Ferrell, Mayor Date: June 2"d, 2015 To: Isaac Conlen, Planning Manager From: Tony Doucette, P.E. Subject: Pacific Highway Dispersion Trench South of S 3561h Street Surface Water Management plans to install a dispersion trench on a SWM owned conservation property south of S 356th Street and east of Pacific Highway as shown on Exhibit 1. The dispersion trench will be installed in advance of improvements to Pacific Highway with the Phase V HOV lanes to be constructed next year. The entire proposed work is outside of the wetland buffer as mapped by City GIS data, however, the work is within the wetland buffer delineated by a wetland report prepared with the S 356th at Pacific Highway intersection improvements in 2005. The conservation property was acquired with King County grant assistance and the proposed use has already been approved by King County staff. This memorandum details the proposed installation plan, requesting permission from the Director of Community Development per the City of Federal Way Revised Code (FWRC) section 19.175.040-(3). The proposed facility and areas of impact/restoration are discussed below. Exhibit 1 shows the proposed trench location, the City's wetland GIS mapping and the wetland mapping from the S 356th at Pacific Highway intersection improvements. Exhibit 2 shows the trench and pipe alignments, profiles and details. Two 50-ft long gravel trenches will be connected by +/-54 ft of 12-in diameter storm drain. Both dispersion trenches will be 2.5 ft wide, approximately 3 ft deep and filled with gravel and a notched board to evenly distribute flow. The alignment of the trenches as shown will be adjusted during installation to avoid existing trees as much as possible, and the disturbed limits for construction will be minimized. Small, tracked equipment will be used to install the trench and disturbed areas outside of the trench widths will be seeded with a native seed mix. The total disturbed area will be +/-1,500 sf, and installation will involve +/- 50 yards of earthwork. The trenches will be installed by SWM maintenance staff in July of this year and should require limited maintenance after installation. +/- 15,000 sq ft of runoff that already drains to the conservation property via sheet flow will be collected and treated by Filterra Units installed with the Phase V improvements before entering the proposed dispersion trenches. Both trenches have more than 200 ft of flow path prior to entering the wetland. Runoff will flow through the conservation property and eventually to the culvert under S 359`" Street at the north fork of West Hylebos Creek. The proposed installation activity described in this memorandum is a one-time event. Please do not hesitate to request additional information or clarification if needed. Sincerely, Tony Doucette, P.E. SWM Engineer Attachments: 1. Exhibit 1: Location Map 2. Exhibit 2: Dispersion Trench Design Drawings 3. S 356`h St 1 SR 99 Intersection Wetland Report CUY OF Federal Way South 356th Street / SR 99 Intersection Improvement Project Draft Wetland and Stream Delineation Technical Memorandum Date: December 12, 2005 (Updated January, 2006) To: Al Emter, City of Federal Way From: HDR Engineering Inc. Subject: Draft Wetland and Stream Delineation Technical Memorandum for the South 356th Street/SR 99 Intersection Improvements Project Purpose of the memorandum This memorandum documents the wetlands and streams found in a portion of the South 356th Street/SR 99 Intersection Improvements Project area. The study area consists of the area east of Pacific Highway South (also known as State Route 99) and south of the existing South 356th Street (Attachment 1). All of the study area is within the Hylebos Creek drainage basin. A two step process was used to determine the presence of wetlands and streams in the study area. In step one, HDR staff reviewed existing environmental documents. The second step was a field evaluation. The initial field reconnaissance was followed by delineation of wetlands and streams within the study area. These steps and the results are discussed in detail below. Document Review HDR Staff reviewed the following existing environmental documents to determine the presumed presence of wetlands in the South 356th Street/SR 99 Intersection Improvements Project study area: • National Wetland Inventory Wetland Mapper (http://wetlandsfws.er.usas.ciov/wtlnds/launch.html) • King County Wetland Inventory (htt://www.metrokc. ovl is/ma octal/iMAP main.htm) • Soil Survey of King County Area, Washington (Snyder et al., 1973) • City of Federal Way zoning and critical areas maps (htip://www,cityoffederalway.com/Page.aspx?view=341) • Friends of the Hylebos Wetlands website (http://www.hylebos.org/index.htm) Wetlands No wetlands were mapped on the proposed South 356th Street alignment. A single large wetland (Wetland 32-21-4-119) is mapped to the south of the alignment and extending over to SR 99 at 359th (see attachment 1). Draft Wetland and Stream Delineation Technical Memo December 2005 City of Federal Way — S. 35e Street / SR 99 Intersection Improvement Project Page 1 Streams One stream (the headwaters of the North Fork Hylebos Creek) is mapped in the study area. North Fork Hylebos Creek crosses the study area flowing east along South 356th Street and then south out of the study area. Zoning The study area is zoned BP, for business park development (Attachment 1). Zoning for surrounding areas includes business development and residential districts. Land Use The portion of the study area near the intersection of South 356th Street and SR 99 is currently used for commercial purposes and the eastern half is vacant. Areas to the south are entirely vacant, and are currently vegetated with a mixture of forested and shrub wetland and forested upland communities. The surrounding land uses include a mixture of vacant land and commercial and residential developments (Attachment 2). A commercial tire recycling operation and a large stormwater facility (operated by the City if Federal Way) are located to the north. The parcel on Pacific Highway South (west of the Federal Way Parcel) immediately south of the proposed South 3561" Street alignment is occupied by a motel. Field Reconnaissance Vegetation, soil, and hydrologic conditions were observed in several locations along the proposed South 356" Street alignment. No wetlands were identified in the proposed South 3561" Street alignment; however two wetlands were identified to the south and east. Vegetation in proposed south 356t" Street alignment is dominated by a mixture of bentgrasses (Agrostis sp.) and disturbance tolerant forbs (hairy cat's ear [Hypocharis radicata], plantain [Plantago sp.],) and small red alder (Alnus rubra) and black cottonwood (Populus balsamifera) saplings (Photographs 1, 2, and 3). The areas to the north and south of the alignment are forested. The forest canopy dominated by red alder and black cottonwood with a few scattered western red cedar (Thuja plicata). The understory is predominantly Himalayan blackberry (Rubus armeniacus) with salmonberry (Rubus spectabilis), snowberry (Symphoricarpos albus), redtwig dogwood (Corpus sericea), and Indian plum (Oemleria cerasiformis) locally dominant. Reed canarygrass (Phalaris arundinacea), sword fern (Polystichum munitum) and bracken fern (Pteridium aquilinum) are the dominant herbaceous species. Some areas of shallow surface ponding (approximately 1 inch) were observed near the proposed alignment, but this likely result from recent rainfall on the compacted surface. No saturated soils were observed in this area. Soils in the forested area were loose and well drained, with no indications of saturation or ponding. No redoxymorphic features were observed in the soils along the proposed South 356t" Street alignment (See data plot Beck-1-11). This slope to the south of the proposed alignment show ample evidence of filling. Construction debris (large rocks, wood material, and a street lamp base) was present on the surface, and the stem of a western Draft Wetland and Stream Delineation Technical Memo December 2005 City of Federal Way — S. 3561h Street / SR 99 Intersection Improvement Project Page 2 red cedar tree was partially buried by dirt and debris, subsequently killing the tree. An old erosion control fence is located at the top of the bank. Both the fill and the fence likely date to the time of the tank removal and cleanup. Wetlands HDR Staff visited the study area on November 29th and 30th, and December 9th, 2005 to confirm the location of wetland boundaries and stream ordinary high water marks. Two wetlands were identified. Detailed descriptions of the wetlands are provided below, and a summary of the characteristics of the wetlands identified in the field reconnaissance is provided in Table 1. A description of the delineation methods is provided in Appendix A. Note that the boundaries delineated by HDR biologists have not been reviewed by regulatory agencies, and should be considered preliminary. Table 1. Wetland Size, Rating, and Classification for Wetlands in the South 356th Street/ Pacific Highway South Intersection Improvements study area Wetland Estimated Wetland Rating Buffer Widtha Area City of Federal (in feet) (in acres) Way' USFWS b Classification Wetland 32-21-4-119 80 acres° 1 200 Forested, Scrub/shrub, _ Emergent Wetland 2 -2,440 square Not Regulated - Forested feetd a Wetland ratings and buffer widths are based on Federal Way Community Code, Chapter 22. All ratings shown in this table are preliminary and have not been reviewed by the City of Federal Way or other regulatory agencies. b Cowardin et al. (1979). All wetlands are palustrine. ° Overall wetland size is estimated based on aerial photograph interpretation and City of Federal Way wetland inventory information. d Wetland size is based on instrument survey by EMS Consulting, 2005. Wetland 32-21-4-119 Descri firm Wetland 32-21-4-119 occupies a broad flat area on either side of North Fork Hylebos Creek Attachment 1 and Figure 1). Habitats present in Wetland 32-21-4-119 include forested, scrub/shrub and emergent communities. vegetation The northern edge of Wetland 32-21-4-119 consists for forested wetland. The canopy is dominated by red alder although occasional western red cedar trees are also present (Photographs 4 and 5). A few scattered western hemlock (Tsuga heterophylla) trees are present on hummocks, and black cottonwood is dominant in the south and west. Salmonberry is the dominant shrub, although scattered hardhack (Spiraea douglasit) shrubs are also present. Herbaceous vegetation is largely absent in the northern end of Wetland 32-21-4-119, although reed canarygrass, stinging nettle (Urtica dioica), and creeping buttercup (Ranunculus repens) were observed further away from the wetland boundary (Photograph 7). Vegetation in the southern portions of Wetland 32-21-4-119 is predominantly red alder and black cottonwood, although occasional western red cedar. The understory includes Sitka, pacific, and Scouler's willows (Salix Sitchensis, S. lasiandra var. lucida, and S. scouleriana), vine maple (Acer circinatum), salmonberry and hardhack (Spiraea douglasit). The herbaceous vegetation includes reed canarygrass, stinging nettle, lily -of - the -valley (Maianthenum dilatatum), creeping buttercup, and skunk cabbage (Lysichiton Draft Wetland and Stream Delineation Technical Memo December 2005 City of Federal Way - S. 356rh Street / SR 99 Intersection Improvement Project Page 3 americanum). Several emergent areas are present in Wetland 32-21-4-119. Emergent areas in the north are dominated by cree� ing buttercup and reed canarygrass, and the emergent area along SR 99 north of 356' Street is predominantly reed canarygrass. The dominant species in Wetland 32-21-4-119 are facultative or wetter, and their presence satisfies the hydrophytic vegetation criterion. The adjacent uplands to the north are dominated by disturbed upland forest, which slope upward and west onto the motel parcel, and upward and north (Photographs 4 and 5). Vegetation on these slopes is predominantly red alder and black cottonwood, although big leaf maple (Acer macrophyllum) and western hemlock are also present. The understory is dominated by dense thickets of Himalayan blackberry, but vine maple and salmonberry are also present in substantial quantities. The herbaceous stratum is predominantly stinging nettle, and mosses are common on the surface of the ground to the north. Adjacent upland along South 359th Street and Pacific Highway South include disturbed upland forest and mowed road edges. The canopy of this forest is predominantly red alder and black cottonwood, although Douglas fir and big leaf maple are also present. The understory includes dense thickets of Himalayan blackberry, and more dispersed Indian plum, red elderberry (Sambucus racemosa), hardhack, and Scouler's willow. Occasional ornamental shrubs (apples [Malus domestica] and holly [llix aquifolium]) were also present. The herbaceous strata includes reed canarygrass, largeleaf avens (Geum macrophyllum), cleavers bedstraw (Gallium aparine) and creeping buttercup. Sword fern, bracken fern, and western St John's wort (Hypericum formosa) are locally abundant. Hydrolag Elevated groundwater appears be the primary water source for the northern portion of Wetland 32-21-4-119. Overflows from North Fork Hylebos Creek are channeled directly under the proposed South 256th Street alignment to Wetland 32-21-4-119 in a concrete culvert (Photographs 8-10), and likely also play an important role in the hydrology of the system. Runoff from adjacent uplands may also contribute water to the wetland. Areas of shallow inundation and soils saturated to the surface were observed in Wetland 32- 21-4-119 (Photographs 6 and 13). The presence of saturated soils in the upper 12 inches of the soil profile is indicative of wetland hydrology. Adjacent upland areas are well drained. Soils were excavated to a depth of at least 17 inches, and no saturation was observed (Photographs 14 and 15). Soils Soils in the northern portion of Wetland 32-21-4-119 were composed of black (10YR 2/1) silt loam extending to a depth of more than 16 inches (Photograph 13). In the southern portion of the wetland, a narrower layer of this silt loam overlies a layer of gleyed, greenish gray (5GY 6/1) clay to olive gray (5Y 5/2) clay loam with fine prominent redoxymorphic features. The presence of this low chroma soil colors and redoxymorphic features meets the wetland soil criterion. Soils in the adjacent uplands were generally loam overlying fine sands to gravelly sandy loam. Glass, PVC pipe and other construction debris were common on the (likely) filled slopes to the north (Photographs 12 and 14). Soils to the west of Wetland 32-21-4-119 appear to be natural, and have some hydric characteristics before meeting the fill slopes Draft Wetland and Stream Delineation Technical Memo December 2005 City of Federal Way — S. 356�h Street / SR 99 Intersection Improvement Project Page 4 to the motel site. The owners of the motel site indicate that this area was substantially wetter in the past. Conclusion All three wetland criteria (wetland vegetation, hydrology, and soils) were present in Wetland 32-21-4-119. The presence of positive indicators for these three criteria meets the wetland definition. Wetland Rating The City of Federal Way classifies Wetland 32-21-4-119 as a Category I wetland under the Federal Way Community Code (FWCC 22) due to the size and number of wetland communities. Category I wetlands require a standard buffer width of 200 feet. Our field observations confirm the approximate location of the wetland as shown on Zoning Map No. 98. Wetland 2 Description Wetland 2 is a small (approximately 2,440 square feet) forested wetland located between Wetland 1 and Pacific Highway South (see Figure 1). It occupies a shallow depression in the upland terrace east Wetland 1. Wetland 2 is not shown on the Federal Way Wetland Inventory. ye_ Qetatlon Vegetation in Wetland 2 is dominated by red alder and black cottonwood, with an understory of hardhack and salmonberry. The herbaceous stratum is dominated by creeping buttercup and largeleaf avens, though some small pockets of slough sedge (Carex obnupta) are present. The overall plant community is dominated by species ranked as facultative or wetter, which satisfies the wetland vegetation criterion. The surrounding uplands are dominated by similar species, but also include dense thickets of Himalayan blackberry, along with reed canarygrass and cleavers bedstraw (see Appendix A, data sheets 1 U and 21-1). Much of the area east of the pullout on Pacific Highway South has been paved with asphalt in the past. The asphalt has become covered with a thin layer of organic debris and herbaceous vegetation. Hydrology Wetland 2 appears to receive its water as runoff from the adjacent uplands. Saturated soils were observed in the upper 12 inches of the soil profile during the delineation, but the B and C horizons were not saturated. This may be the result of the relatively impermeable strata trapping water at the surface. The presence of saturated soils in the upper 12 inches of the soil profile meets the wetland hydrology criterion. Soils Soils in Wetland 2 consist of a very dark gray (10YR 3/1) silt loam overlying a dark grayish brown (2.5Y 4/2) gravelly silt loam with many, large dark yellowish brown (10YR 4/6) redoxymorphic features. The presence of low chroma soil colors with redoxymorphic features meets the wetland soil criterion. Draft Wetland and Stream Delineation Technical Memo December 2005 City of Federal Way — S. 35e Street / SR 99 Intersection Improvement Project Page 5 Conclusion All three parameters (wetland vegetation, hydrology, and soils) were present in Wetland 2. This supports the conclusion that the area meets the definition of a wetland. Wetland Rating Wetland 2 is less than 2,500 square feet in size and has only one wetland habitat type. Wetlands less than 2,500 square feet are not regulated by the City of Federal Way, and do not have buffer requirements. It should be noted that the City may determine that Wetland 2 is functionally connected to Wetland 1. If this is the case, Wetland 2 would be regulated under Federal Way's community code, and would receive a rating and the applicable buffer. While activities in Wetland 2 would not be regulated by the City of Federal Way, the area does meet the three parameter wetland definition, and is still subject to regulation by state and federal agencies. The US Army Corps of Engineers regulates fill all wetlands that are not isolated, and the Washington State Department of Ecology regulates activities in all wetlands, regardless of whether they are isolated or not. Final determination of whether a wetland is isolated or adjacent rests with the US Army Corps of Engineers. Streams Three streams (North Fork Hylebos Creek and two unnamed tributaries) were identified in the study area during the field investigation. A detailed description of the streams is provided below, and a summary of stream characteristics is provided in Table 2. Table 2. Rating and stream types for streams in the South 356th Street/ Pacific Highway South Intersection Improvements study area Stream Stream Ratinga Buffer width Washington State Department of (in feet) Natural Resources Stream Type North Fork Fish Bearing 100 F Hylebos Creek Tributary 1 Tributary to Fish 100 Np (Perennial stream, assumed to be Bearing Stream non -fish bearing) Tributary 2 Tributary to Fish 100 Np (Perennial stream, assumed to be Bearing Stream non -fish bearing) a Stream ratings and buffer widths are based on Federal Way Community Code, Chapter 22. All ratings shown in this table are preliminary and have not been reviewed by the City of Federal Way or other regulatory agencies. b Washington State Department of Natural Resources stream types are based on the Forest Practices Rule for (WAC 222-16- 031). All stream rating and typing is preliminary and has not been reviewed by the City of Federal Way or other regulatory agencies. Stream Description: North Fork Hylebos Creek The North Fork Hylebos Creek is a perennial stream. While the City of Federal Way maps for the area show a portion of the channel on the north side of South 356th Street, no channel was observed in this area (Photographs 16 and 17). The former channel may have been pied into a culvert and control structure (Photograph 18) on the north side of South 356` Street. The stream crosses South 359th Street to the east of SR 99 and flows eastwards near the toe of slope for South 356th Street. Approximately 250 feet to the east, North Fork Hylebos Creek turns to flow south where it crosses the study area. The stream continues to flow southwards, crossing under South 359th Street approximately 1,000 feet west of SR 99. Draft Wetland and Stream Delineation Technical Memo December 2005 City of Federal Way — S. 356�h Street / SR 99 Intersection Improvement Project Page 6 North Fork Hylebos Creek crosses under South 3561h Street in a concrete culvert (Photograph 19). The stream width at the Ordinary High water Mark (OHWM) varied from 6 to 10 feet. A small, riprap lined channel (separated from the main channel by more riprap) extends south approximately 50 feet to an 18 inch concrete culvert, which carries the overflow southward to Wetland 32-21-4-119 (Photographs 8 to 10). Forest vegetation (red alder, black cottonwood, Himalayan blackberry, snowberry, and salmonberry) provides approximately 100 percent cover for the overflow channel. The main stem of Norm Fork Hylebos Creek travels east along the south side of South 3561h Street. The channel in this reach varies from 6 to 10 feet wide at the Ordinary High Water Mark (OHWM), and the banks are approximately 4 feet high and steeply sloped. Riprap has been placed along the banks to stabilize the stream. A small ridge of dirt is located immediately south of the stream, likely this material was excavated to create the current stream channel. The substrate in this reach is largely fines, although some riprap is also present in the channel. The stream is characterized by relatively fast moving water with few riffles. Forest vegetation (as described above) provides approximately 100 percent stream cover (Photographs 29 and 30). This riparian vegetation is approximately 100 feet wide to the south and 20 feet wide to the north, where the stream buffer meets South 3561h Street (Photograph 31). Approximately 250 feet east of the culvert, North Fork Hylebos Creek turns to the south. The OHWM in this reach varies from 3 to 8 feet in width, and the steep banks are approximately 4 to 5 feet high. Riprap walls line portions of the eastern bank. The substrate includes more gravel; small pools (approximately 5 feet long and 1 foot deep) alternate with shallow riffles. Small cascades (12 to 18 inched high) occur approximately every 40 feet. Riparian vegetation is similar to the previous reach, and extends approximately 20 feet east of the stream and 100 feet to the west. These stream conditions prevail southward to the limits of the study area (Photographs 32 through 34). Stream Description: Tributaries to North Fork Hylebos Creek Tributary 1 drains the southwest portion of Wetland 32-21-4-119. It is a small stream, approximately 18-24 inches wide at the OHWM (Photograph 35). Tributary 1 begins at a dense thicket of salmonberry and hardhack, and flows approximately 50 feet to the south before crossing under South 359th Street in a culvert. The substrate is predominantly silts and sands, but the flow of water appears relatively rapid and consistent. No pools were observed. Tributary 2 flows west to east along the north side of South 359th Street. It is approximately 50 feet long, and 18-24 inches wide at the OHWM. Tributary 2 begins near the emergent portion of Wetland 32-21-4-119 near the intersection of South 359th Street and Pacific Highway South, and flows eastwards to join Tributary 1 approximately 10 feet north of the culvert under South 359" Street. The substrate of Tributary 2 consists of silts and sands. The water in Tributary 2 is slow moving, and the numerous pools contain iron rich algae. Stream Ratings The North Fork of Hylebos Creek is a fish bearing stream. Fish bearing streams in the City of Federal Way are classified as major streams, and require a standard setback of 100 feet. Draft Wetland and Stream Delineation Technical Memo December 2005 City of Federal Way — S. 3561h Street / SR 99 Intersection Improvement Project Page 7 Tributary 1 and Tributary 2 are tributaries to North Fork Hylebos Creek. All tributaries to fish bearing streams in Federal Way are classified as major streams, and require a setback of 100 feet. Summary No wetlands were identified on the proposed South 356th Street alignment. A large wetland (Wetland 32-21-4-119) was identified on to the south of the proposed alignment, and a second smaller wetland was located to the southeast of the alignment. Wetland 32-21-4-119 is rated Category I by the City of Federal Way, and the required 200 foot buffer would likely extend into the proposed alignment. A Jurisdictional Determination should be requested from the US Army Corps of Engineers to confirm the boundary of Wetland 32-21-4-119 and Wetland 2 in the project vicinity. North Fork Hylebos Creek flows east and south across the study area. North Fork Hylebos Creek is classified as a major stream by the City of Federal Way, and requires a 100 foot buffer. This stream buffer extends extend south and west of the stream onto the proposed alignment. Two smaller tributaries are present along South 359th Street. Buffers and setbacks for these streams are either within existing wetlands or paved areas of South 359th Street. Construction of the proposed improvements for the South 3561h Street/SR 99 Intersection Improvements Project will affect North Fork Hylebos Creek, its buffer, and the buffer of Wetland 32-21-4-119. Draft Wetland and Stream Delineation Technical Memo December 2005 City of Federal Way — S. 35e Street / SR 99 Intersection Improvement Project Page 8 REFERENCES Cooke, S.S. 1997. A Field Guide to the Common Wetland Plants of Western Washington and Northwest Oregon. Seattle Audubon Society, Seattle, Washington. Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. 1979. Classification of wetlands and deepwater habitats of the United States. Government Printing Office, Washington, D.C. Ecology (Washington State Department of Ecology). 1997. Washington State wetland identification and delineation manual, Publication #96-94. Olympia, Washington. Environmental Laboratory. 1987. Corps of Engineers Wetland Delineation Manual. Technical Report Y-87-1, Environmental Laboratory, Department of the Army, Waterways Experiment Station, Vicksburg, Mississippi. Federal Way, City of. Federal Way Community Code. (Available online at http://search.mrsc.org/nxtl ateway.dl]/Cdwyinc?f=templates&fn=fdwypage.htm$vid=mun icodes:FederalWay (City of Federal Way, Wa. Federal Way, City of. 2002. Pacific Avenue Road Improvements for the New High School in Federal Way, Sensitive Areas Study. Prepared by Adolfson Associates, Inc. for the City of Federal Way. Federal Way, Washington. Friends of the Hylebos Wetlands website(http:l/www.hylebos.org/index.htm7. Accessed December, 2005. Greytag Macbeth Corporation. 1994. Munsell soil color charts. HDR Engineering, Inc. 2005. Wetland Reconnaissance Technical Memorandum. Prepared for the City of Federal Way, Federal Way, Washington. Hitchcock, C.L. and A. Cronquist. 1973. Flora of the Pacific Northwest. University of Washington Press, Seattle, Washington. King County Wetland Inventory(http:llwww.metrokc.gov/gis/mapportal/iMAP_main.htm Accessed December, 2005. NRCS (Natural Resource Conservation Service). 2003. Field Indicators of Hydric Soils in the United States. U. S. Department of Agriculture in cooperation with the National Technical Committee for Hydric Soils. Pojar, J. and A. MacKinnon. 1994. Plants of the Pacific Northwest Coast. Lone Pine Publishing, Redmond, Washington. Reed, P.B., Jr. 1997. Revision of the national list of plant species that occur in wetlands. U.S. Department of Interior, Fish and Wildlife Service. Washington, D.C. Snyder, D.E., P.S. Gale, and R.F. Russell. 1973. Soil Survey of King County Area, Washington. USDA Soil Conservation Service, In Cooperation with Washington Agricultural Experimental Station. United States Government Printing Office, Washington D.C. Draft Wetland and Stream Delineation Technical Memo December 2005 City of Federal Way — S. 35e Streetl SR 99 Intersection Improvement Project Page 9 USDA, NRCS (U.S. Department of Agriculture, Natural Resources Conservation Service). 2004. The PLANTS Database, Version 3.5 (http:llplants.usda.gov). National Plant Data Center, Baton Rouge, LA 70874-4490 USA. USFWS (U,S. Fish and Wildlife Service). 2004. National Wetland Inventory, Renton, Washington Quadrangle. http:I/wetlandsfws.er.usgs.gov/wtlnds/launch.html. U.S. Department of Fish and Wildlife Service. Portland, Oregon. Draft Wetland and Stream Delineation Technical Memo December 2005 City of Federal Way — S. 356`h Street / SR 99 Intersection Improvement Project Page 10 APPENDIX A WETLAND DELINEATION METHODS Wetlands were identified and delineated using the three parameter method described in Washington State Wetland Identification and Delineation Manual (Ecology, 1997). HDR Engineering, Inc. staff collected data for each of the three parameters (hydrophytic vegetation, hydric soils, and wetland hydrology) in areas that represent typical site conditions. Staff collected additional data in associated uplands as needed to confirm wetland boundaries. These data were recorded on standard wetland delineation data sheets (attached). VEGETATION The dominant plants and their wetland indicator status were evaluated to determine if the vegetation was hydrophytic. Hydrophytic vegetation is defined as vegetation adapted to wetland conditions. To meet the hydrophytic vegetation criterion, more than 50 percent of the dominant plants must be Facultative, Facultative Wetland, or Obligate, based on the wetland indicator category assigned to each plant species by US Fish and Wildlife Service (USFWS) (Reed, 1997). Table 1 lists the definitions of the indicator categories. Table 1. Definitions of Wetland Plant Indicator Categories used to Determine the Presence of Hydrophytic Vegetation Wetland Indicator Category Symbol Definition Obligate Wetland Plants OBL Plants that almost always (> 99% of the time) occur in wetlands, but which may rarely (< 1% of the time) occur in non - wetlands. Facultative Wetland Plants FACW Plants that often (67 to 99% of the time) occur in wetlands, but sometimes (1 to 33% of the time) occur in non -wetlands - Facultative Plants FAC Plants with a similar likelihood (34 to 66% of the time) of occurring in both wetlands and non -wetlands. Facultative Upland Plants FACU Plants that sometimes (1 to 33% of the time) occur in wetlands, but occur more often (67 to 99% of the time) in non - wetlands. Upland Plants UPL Plants that rarely (< 1 % of the time) occur in wetlands, and almost always (> 99% of the time) occur in non -wetlands. Source: Reed (1997) HDR biologists used R Field Guide to the Common Wetland Plants of Western Washington and Northwest Oregon (Cooke, 1997) and Plants of the Pacific Northwest (Pojar and MacKinnon, 1994) as field references to assist with plant identification. Scientific and common plant names follow currently accepted nomenclature. Most names are consistent with Flora of the Pacific Northwest (Hitchcock and Cronquist, 1973) and the PLANTS Database (USDA, 2004). Draft Welland and Stream Delineation Technical Memo December 2005 City of Federal Way -- S. 356d" Street I SR 99 Intersection Improvement Project Page 11 HYDROLOGY Project staff examined the area for evidence of hydrology. Wetland hydrology criteria were considered to be satisfied if it appeared that the soil was seasonally inundated or saturated to the surface for a consecutive number of days greater than or equal to 12.5 percent of the growing season. The growing season begins when the soil reaches a temperature of 41 degrees Fahrenheit in the zone of root penetration. The growing season in low elevations in western Washington is typically considered to be from March 1 to October 31 (244 days) (Washington State Department of Ecology 1997). Primary indicators of hydrology include surface inundation and saturated soils. Secondary indicators of hydrology include drainage patterns, watermarks on vegetation, water -stained leaves, and oxidized root channels. SOILS Generally, an area must contain hydric soils to be a wetland. Hydric soil forms when soils are saturated, flooded, or ponded long enough during the growing season to develop anaerobic conditions in the upper part (12 inches). Biological activities in saturated soil result in reduced oxygen concentrations and organisms turn to anaerobic processes for metabolism. Over time, anaerobic biological processes result in certain soil color patterns, which are used as indicators of hydric soil. Typically, low-chroma colors are formed in the soil matrix, and bright -colored redoximorphic features form within the matrix. Other important hydric soil indicators include organic matter accumulations in the surface horizon, reduced sulfur odors, and organic matter staining in the subsurface (NRCS, 2003). BOUNDARY IDENTIFICATION The delineated wetland boundaries were flagged with sequentially numbered, bright pink flagging. Boundaries were numbered in the order in which they were encountered in the field, and numbering does not necessarily reflect geographic location. Data plot locations were flagged with blue and white striped flagging and labeled with the wetland and plot number. Field data sheets for wetlands are provided in Appendix A. The ordinary high water marks (OHWMs) of streams were flagged with blue flags on the Parcel 1, and blue and white striped flags on the Federal Way Parcel. Flags were generally paired (e.g. 1, 1 a) and consecutively numbered. All delineated wetlands and streams will be instrument -surveyed and maps will be prepared by the surveyors. Draft Welland and Stream Delineation Technical Memo December 2005 City of Federal Way - S. 35611 Street / SR 99Intersection Improvement Project Page 12 ATTACHMENT A FIGURES & SITE PHOTOGRAPHS Draft Welland and Stream Delineation Technical Memo December 2005 City of Federal Way — S. 35e Street / SR 99 Intersection Improvement Project Page 13 Z98 Image Map Page Page I o 0TV OF Federal Way 47117 11.155927 N M. Zoning Map 98 NE 29-21-04 - NE quarter of Kroll 744 a P BP V1 A Y cU 47' 1? 11, tbW? N BP LUMS HARDWARE BC BC BP T lap Awl BP BP OP i3p RS15.0 RS45.0,1 t,-V %,14 )0 M.V4 I k; qTW 5T RS35.0 INC( RS1,5,0 7- RS115.0 LA 47* 15 43 467075 N 47* 16 43.457M N Legend: Zoning Designations: Source: 1 "98 =L., r J. On H r1d 3- I!L Parcels City Q W Property Landmark GornmunRy BLisiness amapprokirnale and ad areas may ex'V Thi r I s NOT;z substitute Far a floW survay. Ar Zoning Boundary (S.v?A mull-farnily Business Park Ofte Park ScaWetlands-le Wetlands- 291& ark P Gornplex I un1tM5,000S.F- 0 250 500 Feet N Private Tract/ I unftM, 000 8, F C wried Property CtZ?SWW_I) lQng County Owned Property rnrn CoonAroa 1 unW5 acres Map a acccercal 1W 0V Pubbc School mawurat- es, aid is 5i-p.'v a &ji I=o Watm rVaia9v m c n t a g,a0ic.-ap,eaan12Uon httn-//u7xvx,v r.itVnff(-.rif-.rq1WnV 4/11/9( Draft Wetland and Stream Delineation Technical Memo December 2005 City of Federal Way - S. 356h Street / SR 99 Intersection Improvement Project Page 14 N98 Image Map Page Page I t Aerial Photo Map 98 CL CFEB arr er ��--� NE 29-21-04 - WAY Federal Way NE quarter of Kroll 744 � 5 47' 1i 6 1. 15592 7 N 47 17 $-t5592i N 91P qt w. :.� •�ly � -'"" .. 1 tie0. S dr lip Air.y . Ow Ar •fir _ �:,•�'�r � _'+�-� �•� r y•��1 y 1� w y I A'' %� 'j' 'y�id ►1 F. L y y IL r � :• �� ri � fir' 7 + L c� 7kv L w 47. 16 43,467075 N + 47. 16 43.46t075 N Photos .1 r.; ti inw n W 6h pat f:tti.S :i on zVeet mmT -S. Manyla"OrPErkfi rvP Iabated. Scale. a 0 260 500 Feet N Thlsmap lI..m parI ay r10 warra'5' and is sErrp y i���■.r►►i aS-aaiir rep-c ienL !Lw httn-//www r.itvnffP.derg1wgv [:nm/fnl�i Prc/hnmP./illl ClnP.CCP.L:(111nm1[:(j P,VP.�(1111YIP.iItI[`.IiVYYIATIC/!?P.iI P.iA�[:IYVYI'lAl1C 4/R/9. Draft Wetland and Stream Delineation Technical Memo December 2005 City of Federal Way — S. 3561h Street / SR 99 Intersection Improvement Project Page 15 Draft Wetland and Stream Delineation Technical Memo December 2005 City of Federal Way — S. 35eh Street / SR 99 Intersection Improvement Project Page 16 ATTACHMENT B WETLAND DATA FORMS Draft Wetland and Stream Delineation Technical Memo December 2005 City of Federal Way — S. 356�h Street / SR 99 Intersection Improvement Project Page 17 • \ SPR26• _ W o o Z s to � o \ / 10 0 to 20 U)i a WETLAND BUFFER / z w z \ W / " / SCALE: 1'= 10' NOTE: SCALED FOR 11x17 SHEET Itr m N W z N V \ V zr \ \ \ • � it LL (DN o O no z 3 \ ZO W LL I� \ CB#1, 48" DIA. STORM MH ' ` STA:22+73.26, OFFA8.36R ` IhLSTALLE.D BY OTHERS \'\ �6 f•, Ili / g ` \ O / � \ - CLEANOUT WYE#2 STA:21+71.79, OFF:234.12R colvs \\ \ hpr E v CB#2, TYPE I CB � .. \ , \ STA21-95.58, OFF:134.39R INSTALL BEEHIVE GRATE 1 U LL \ Z LU CB#3, Reinforced Concrete \\ \ 53'R:27+71.48, OFF:1B4.66R O „ \ CE FAN[1�fT WYE RI WI SOLID GRATE \ STA:21+94.48, OFF:86.05R `\ S0 w Z 50' GRAVELTRENCH #2, SEE DETAIL51-IEET \ BOTTOM ELEVATION = 149.2 � _ PIPE INVERT 190.2 ^ ' --- , PIPE CROWN = 190.7 \ �\ TOP OF TRENCH = 111HAt \ \ o e \ \ u \ \ so, GRAVEL TRENCH at, SEE DETAIL SHEET •� > x U \ \ BOTTOM ELEVATION = 189.7 1 = E x \ \ PIPEINVERT= 190.7 _ - - \ \ PIPECROWN= 1 91 2 \ \ TOP OF TRENCH = 11;2-ft F = \ \ \ ALOfi' ■ ' w Z w a w Q O a r=i7 a aw � RAC HIGHWAY i \ o \� Q P1 SHT 01 OF O� n • I notched grade board 2' x 2" notches 1a"0.c. pipe O.D. I 1'-0 min min end cap or plug clean out wye from pipe min. rigid 6" perforated pipe laid fiallievel type I CB w/sold cover (Iocking) A A 50' � mpucnl pipe (max design flow <0.5 CFS perlrench) clean out wire from pipe PLAN NTS 1 KING COUNTY DETAIL C.2.1.D - 50' DISPERSION TRENCH WITH NOTCHED BOARD N.T-S- Gaa1, YY 01A. STORM MH IHSfALL[-o BV OTHERS �STA. 12+73�-r, Ra.76 R galvanized bWhS P'pe O.D. 1 0 ,t5"low mm •20 % max 1 0 min N dr-Niu re r,�G�`���%/���f ��� • ifs ♦ treated brad ��i�����/����� oard ❑ �` min. rigkl 6' perforated pipe laid 11W clean (<5 %fines) " - 1 i" washed rack 4' X 47 support post filter fabric / max for flow conlrollwater quality' SECTION A -A Ifestment in rural areas. NTS 1-- 1dr o.c. r grade beam notches NOTES: 1. Thig ltnach ShnN a! WlSbndlod So a5 la preveN point dcCharge anrVor emslan. 2. Trem:has may be pl4ced no closer lhan So feet to one another. (100 feet alang powilno) 3. Tfe nch and grada board roust be kwl. Afyn IQ fallow [Craws of "a, 4. Supporl poll spacing as required by Sail coaan ion: to nnsure grade board remalns ievel. \ 1 1 14Y- \ 95 1 \ \ \ TYPE I Ca w/ GRATE \ _ T2 tyt 3a SA F. 1N 39R 2 1 WUIE EE7 l- CONSTRUCTED WITH PHASEV COMTRUCTEDe. SWM 1 j \ \ I can Wi 1E 1cO \ S SFA.71.73.48, OR -IDIA 1 _ GRATES 113 LF 12" HDM � i s4 Ls 1r kl]pE ' 0.685Q i 1 r 1 90 � I r r 1' I. I E.Inf•19a;71tZ Eld Nt.a�x•tat,T ltraq r .L MIar.I it$'NEI l&Iruhlaa,7161Vy 2 IE in•Igp.T tlr Nyll r t .A.1 i,E-mt fir E7 211rM 1 fiSS LL W LL W W LL Y W LL W LL 00 W LL W -0+25 0+00 0+50 1+00 1+50 1+78 2 PROFILE VIEW SCALE. 1-=10' VERTICAL SCALE 1-1.25' SOuouo 184 fie R z O O 2 Z w V) � J Z Q O 0f 0 w o a `Z � a w Q J_ _ O U, 0 a I.- = LU a U Z U wU w wZ Cd = 01 o� a rn aaw Q P2 #Z 9 Y W 02 OF02 4§� CITY OF Federal APPLICATION NO(S) Way Parcel Number(s) f 9,f Lo 11004 MASTER LAND USE APPLICATION DEPARTMEN-r OF COMMUNITY DEVELOPMENT SERVICES 33325 S'" Avenue South Federal Way, WA 98003-6325 253-835-2607;Fax 253-835-2609 www.Citvoffedcral way.com Date 04 03 /r f Project Description .1A1XrAt4g itak1 Type of Permit Required Annexation Binding Site Plan Boundary Line Adjustment Comp Plan/Rezone Land Surface Modification Lot Line Elimination Preapplication Conference Process I (Director's Approval) Process H (Site Plan Review) Process III (Project Approval) Process IV (Hearing Examiner's Decision) Process V (Quasi-Jddicial Rezone) Process VI SEPA w/Project SEPA Only Shoreline. Variance/Conditional Use Short Subdivision Subdivision _Variance: Commercial/Residential -- 0 Required Information (X, Zoning Designation 0#6V ,:ilk Comprehensive Plan Designation Value of Existing Improvements Value of Proposed Improvements International Building Code (IBC): Occupancy Type 'J Construction Type Applicant Name: /may - pWcclr6 Address: 3337-S 3rNA(cs City/State: 10044,4447, L- 28003 Zip: Phone: #9 85T-- :2 10 Fax. Email: 7aNY:•-P&QTrC& 4 j' WAZV14A W4'K &I" Signature: A6 75k— Agent (if different than Applicant) Name: Address: City/State: Zip: Phone: Fax: Email: Signature: Owner Name: Address: City/State: Zip: Phone: Fax: Email: Signature: Bulletin #003 — January 1, 2011 Page 1 of 1 k:\Iandouts\Master Land Use Application