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HomeMy WebLinkAboutRS_May Creek BA-CAR Biological Assessment City of Renton May Creek Trail South Project Submitted to: City of Renton Land Use Review Renton, Washington On Behalf of Applicant: City of Renton Parks and Planning Department, Renton, Washington SEPTEMBER 2024 Submitted by WSP USA 1201 Pacific Ave. Suite 550 Tacoma, Washington 30902211.000 DRAFT Biological Assessment WSP USA, 30902211.000 City of Renton, May Creek Trail South Project September 2024 Renton, Washington Page ii of ii BIOLOGICAL ASSESSMENT CITY OF RENTON MAY CREEK TRAIL SOUTH PROJECT TABLE OF CONTENTS SECTION PAGE 1.0 PURPOSE OF BIOLOGICAL ASSESSMENT ................................................................1 2.0 PROPOSED ACTION AND ACTION AREA ...................................................................1 2.1 Proposed Action ................................................................................................1 2.2 Duration of Activities .........................................................................................3 2.3 Minimization Measures and Best Management Practices ...............................4 2.4 Action Area .........................................................................................................5 3.0 STATUS OF SPECIES AND CRITICAL HABITAT .........................................................8 4.0 BIOLOGICAL REQUIREMENTS ....................................................................................9 4.1 Chinook Salmon (Oncorhynchus tshawytscha) ............................................10 4.2 Steelhead (Oncorhynchus mykiss) .................................................................10 4.3 Bull Trout (Salvelinus confluentus) ................................................................11 4.4 Critical Habitat Designation for Each ESU/DPS .............................................12 4.5 Primary Constituent Elements ........................................................................13 5.0 ENVIRONMENTAL BASELINE ....................................................................................14 5.1 General Setting ................................................................................................14 5.2 Terrestrial Habitat ............................................................................................14 5.3 Riparian and Aquatic Habitat ..........................................................................14 6.0 INDICATORS ANALYSIS .............................................................................................15 6.1 Water Quality ....................................................................................................16 6.2 Habitat Access .................................................................................................17 6.3 Habitat Elements ..............................................................................................17 6.4 Channel Conditions and Dynamics ................................................................18 6.5 Flow/Hydrology ................................................................................................19 6.6 Watershed Conditions .....................................................................................20 6.7 Pathways and Indicators Specific to Bull Trout Only ....................................20 7.0 EFFECTS OF THE ACTION .........................................................................................21 7.1 Direct Effects ....................................................................................................21 7.2 Indirect Effects .................................................................................................22 7.3 Effects from Interdependent and Interrelated Actions ..................................22 7.4 Effects Determinations for Listed Species and Designated Critical Habitat23 8.0 REFERENCES ..............................................................................................................25 9.0 LIST OF ACRONYMS AND ABBREVIATIONS ............................................................27 DRAFT Biological Assessment WSP USA, 30902211.000 City of Renton, May Creek Trail South Project September 2024 Renton, Washington Page ii of ii LIST OF TABLES Figure 1 Project Vicinity .......................................................................................................... 2 Figure 2 Project Action Area ................................................................................................... 6 LIST OF TABLES Table 1. Project Equipment and Terrestrial Noise Levels 7 Table 2. Project-Related Terrestrial Noise Attenuation 7 Table 3. Species Listed under the ESA Addressed in this BA 8 Table 4. Non-ESA-Listed Species Not Addressed in this BA 9 Table 5. Species Listed under the ESA but Not Addressed in this BA 9 Table 6. Overview of Environmental Baseline Conditions at Action Area and Watershed Scales 15 Table 7. Effects Determinations Summary – Species 23 Table 8. Effects Determinations Summary - Critical Habitats 23 LIST OF APPENDICES Appendix A – Selected 60% Design Plans Appendix B – Species Lists Appendix C – Essential Fish Habitat DRAFT Biological Assessment WSP USA, 30902211.000 City of Renton, May Creek Trail South Soft Surface Trail and Bridge Project September 2024 Renton, Washington Page 8 of 29 BIOLOGICAL ASSESSMENT CITY OF RENTON MAY CREEK TRAIL SOUTH SOFT SURFACE TRAIL AND BRIDGE PROJECT 1.0 PURPOSE OF BIOLOGICAL ASSESSMENT The City of Renton Parks Planning and Natural Resources Division (City) proposes the May Creek Trail South Project (Project), a soft surface trail and bridge at May Creek Open Space Park (Park) in Renton, Washington (Appendix A). The proposed soft surface trail will be one-quarter mile in length, consisting of an approximate 6 ft width trail at existing grade with two spurs leading to viewing areas, boardwalk portions at wetland drainage sections, and will tie into an existing trail on the north side of the creek. The bridge will be approximately 100 ft length, approximately 6 ft width, and will cross May Creek at the eastern portion of the site. The trail is designed to be a Trail Class 4 to meet the existing classification and both the trail and bridge will conform to the Americans with Disabilities Act (ADA). RMC 4-8-120D.2 requires preparation of a biological assessment/critical areas study for projects with the potential to impact fish (Chinook salmon, bull trout, steelhead trout), unexpected, new, rare or other endangered species habitat. The proposed action will involve minimal work within the 100-year floodplain – an approximately 50 ft length of spur trail will be located within the 100-year floodplain. This section will match the existing conditions and would not require grading or fill activities. Two trail sections will cross existing wetland drainage areas and will be a boardwalk in these locations. The bridge is a span that will not impact the waterway and the bridge abutments will be positioned above the OHWM, floodway, and 100-year floodplain. The purpose of this biological assessment (BA) is to evaluate the potential effects of the proposed activities on ESA-listed species for purposes of review by the City of Renton Land Use Department. This report evaluates the likely effects of proposed alterations within the floodplain, riparian buffer zone, and channel migration zone and finds that the project is not likely to adversely affect threatened salmonids or critical habitat. The project does not have a federal nexus; therefore, consultation with NMFS and US Fish and Wildlife Service is not required under Section 7 of the Endangered Species Act (ESA). The project, as proposed, will not result in “take” of listed species; therefore, Section 9 of the ESA does not apply. 2.0 PROPOSED ACTION AND ACTION AREA 2.1 PROPOSED ACTION The project site is located in the City of Renton, Washington in Section 32 of Township 24N Range 05E. The action area consists of the trail, graded areas, and bridge, within the 8.21-acre tax parcel 322405-9109, and is defined as the limits of the Project that will be affected directly or indirectly by the Project (Figure 1). DRAFT Biological Assessment WSP USA, 30902211.000 City of Renton, May Creek Trail South Soft Surface Trail and Bridge Project September 2024 Renton, Washington Page 8 of 29 The project site is bordered by Interstate 405 (I-405) to the east and bordered by Lake Washington Boulevard N to the west. May Creek runs through the site and the Ordinary High Water Mark (OHWM) was delineated in December 2022 by WSP biologists. There is an existing nature trail, May Creek Trail, on the north side of May Creek. There are four (4) wetlands located with the parcel, delineated in October 2022 and January 2023 by WSP and documented in the May Creek Trail Project Wetlands and Waterbodies Delineation and Assessment Report. These wetlands have been labeled as Wetland A, Wetland B, Wetland C, and Wetland D. Figure 1 Project Vicinity The purpose of the Project is to construct a soft surface trail and build a bridge at the May Creek Park Greenway in Renton, Washington (Appendix A). The proposed soft surface trail will be one-quarter mile in length, consisting of an approximate 6 ft width trail with 1 ft shoulders at existing grade with two spurs (Spur 1 and Spur 2) leading to viewing areas. The trail will have portions located on a boardwalk where the trail intersects wetlands and will tie into an existing trail on the north side of the creek. The bridge will be approximately 100 ft in length, approximately 6 ft in width and will cross May Creek at the eastern portion of the site. The boardwalk trail and bridge will have slatted decking and the entirety of the trail will conform to ADA accessibility guidelines. Additional details of project components are described below. DRAFT Biological Assessment WSP USA, 30902211.000 City of Renton, May Creek Trail South Soft Surface Trail and Bridge Project September 2024 Renton, Washington Page 8 of 29 2.1.1 Soft Surface Trail Section The trail will be cut into the existing grade and will have a negative cross slope to the outside edge for drainage along hillslopes and crowned along flat sections. The trail will consist of a 6 ft tread with 1 ft shoulders on each side. The surfacing of the trail will be fine bark mulch and the shoulders crushed stone. The base of the fine bark mulch will be crushed stone base course. The trail will maintain a slope under 7% grade to maintain ADA accessibility and the cut and fill sections will maintain a 2:1 slope throughout these sections. Where fill is required, fill will be imported and compacted to build up the subbase. 2.1.2 Boardwalk Trail Section The proposed May Creek Trail South section will cross Wetland C in two (2) locations for a total of approximately 180 ft. These crossings will transition from the soft surface trail section to a boardwalk section. The boardwalk will consist of a timber boardwalk with a fiber-reinforced plastic (FRP) board slatted deck surface to allow for drainage. The boardwalk will be supported by micro piles and will have handrails and/or bull rails for pedestrian safety. 2.1.3 Abutments Concrete bridge abutments will be positioned above the OHWM, floodway, and 100- year floodplain. Approximately 12 cubic yards of material will be excavated at the abutment area to accommodate placement of micro pile supports and the new concrete abutments. The abutments will be cast-in-place and will be set in and backfilled with gravel. 2.1.4 Bridge The 100 ft length and 6 ft width clear span bridge will be comprised of concrete walkways at the north and south portion of the bridge at the abutment locations, and an aluminum gangway type bridge with non-slip FRP slatted decking for the length of the bridge in between the concrete walkways. The bridge measures 600 square feet total, and approximately 240 square feet of this total is located over water as measured from the OHWM. The bridge will be positioned approximately 2 ft above the OHWM. 2.2 DURATION OF ACTIVITIES The project is currently at the preliminary design phase with site invasives species management work ongoing since the spring of 2023, construction to start in late spring 2025, completion in fall 2025, and invasive species restoration work to continue through 2030. The project will be completed in phases described in the following sections. Construction of all elements will occur outside of the May Creek OHWM and are likely not subject to an in-water work window. 2.2.1 Mobilization and Site Preparation This phase consists of clearing, grubbing, and removing trees that are within the trail, boardwalk, bridge alignment and abutments, and construction laydown areas associated with the placement of the bridge. The construction access is preliminary at this point in design and is anticipated to be achieved through working with DRAFT Biological Assessment WSP USA, 30902211.000 City of Renton, May Creek Trail South Soft Surface Trail and Bridge Project September 2024 Renton, Washington Page 8 of 29 Washington State Department of Transportation (WSDOT) on the ongoing I-405 construction access. The bridge sections and crane are anticipated to come into the site from the I-405 construction access and be installed on the western flank of the proposed bridge alignment. A 40 ft clear zone is the assumed clearing limits necessary to stage the crane and allow for the placement of the span sections onto the footings. The foundations will be prepped either by hand or with a mini-excavator. To access the southern foundation, the contractor will either place girders over the stream or use the crane to pass the mini-excavator over May Creek. 2.2.2 Soft Surface Trail Section The trail will be cut into the existing grade and will be sloped to the outside edge for drainage along hillslopes and crowned along flat sections. The trail will consist of a 6 ft tread with 1 ft shoulders on each side. The surfacing of the trail will be fine bark mulch and the shoulders crushed stone. The underlayment of the fine bark mulch will be crushed stone base course. 2.2.3 Boardwalk Trail Section The proposed May Creek Trail South section will cross Wetland C in two (2) locations for a total of approximately 180 ft. These crossings will transition from the soft surface trail section to a boardwalk section. The boardwalk will consist of a timber boardwalk with a FRP board slatted deck surface to allow for drainage. The boardwalk will be supported by micro piles and will have handrails and/or bull rails for pedestrian safety. 2.2.4 Bridge The 100 ft length and 6 ft width clear span bridge will be comprised of an aluminum gangway type bridge with non-slip FRP slatted decking for the length of the bridge in between the concrete walkways. The bridge measures 600 square feet total, and approximately 240 square feet of this total is located over water as measured from the OHWM. The bridge will be positioned approximately 2 ft above the OHWM. The bridge will be placed in sections via a crane, supported either via cantilevering and temporarily shored, and bolted together to form the clear span. 2.3 MINIMIZATION MEASURES AND BEST MANAGEMENT PRACTICES The proposed project will not result in a loss of WOTUS and, thus, will have insignificant effect on the surrounding aquatic habitat. The project will result in a net public access gain and will not alter the existing floodway, 100-year floodplain, and will not impede May Creek. In addition, the following minimization measures and best management practices (BMPs) will be employed during construction to minimize project impacts. 2.3.1 Minimization Measures • No in-water work is proposed. • Project construction will be completed in compliance with Washington State Water Quality Standards (Washington Administrative Code [WAC] 173-201A), including: DRAFT Biological Assessment WSP USA, 30902211.000 City of Renton, May Creek Trail South Soft Surface Trail and Bridge Project September 2024 Renton, Washington Page 8 of 29 − Petroleum products, fresh cement, lime, concrete, chemicals, or other toxic or deleterious materials will not be allowed to enter surface waters. − There will be no discharge of oil, fuels, or chemicals to surface waters or onto land where there is a potential for reentry into surface waters. • The contractor will prepare a spill prevention, control, and countermeasures (SPCC) plan, and it will be used during all construction operations. A copy of the plan with any updates will be maintained at the work site. − The SPCC plan will outline BMPs, responsive actions in the event of a spill or release, and notification and reporting procedures. The plan will also outline management elements, such as personnel responsibilities, project site security, site inspections, and training. − The SPCC plan will outline the measures to prevent the release or spread of hazardous materials found on site or encountered during construction but not identified in contract documents, including any hazardous materials that are stored, used, or generated on site during construction. These items include, but are not limited to, gasoline, diesel fuel, oils, and chemicals. − Applicable spill response equipment and material designated in the SPCC plan will be maintained at the job site. • Corrective actions will be taken in the event of any discharge of oil, fuel, or chemicals into the water, including the following: − Containment and cleanup efforts will begin immediately upon discovery of the spill and be completed in an expeditious manner in accordance with all local, state, and federal regulations. Spill response will take precedence over normal work. Cleanup will include proper disposal of any spilled material and used cleanup material. − The cause of the spill will be ascertained and appropriate actions taken to prevent further incidents or environmental damage. − Spills will be reported to the Washington State Department of Ecology’s (Ecology) Northwest Regional Spill Response Office at 425-649-7000. • Excess or waste materials will not be disposed of or abandoned waterward of the OHWM or allowed to enter waters of the state. Waste materials will be disposed of in an appropriate manner consistent with applicable local, state, and federal regulations. • Demolition and construction materials will not be stored where upland runoff can cause materials to enter surface waters. • Oil-absorbent materials will be present on site to use in the event of a spill or if any oil product is observed in the water. 2.4 ACTION AREA This section describes the action area for the proposed activities. The action area is the defined geographic area that could be affected by the direct and indirect effects of DRAFT Biological Assessment WSP USA, 30902211.000 City of Renton, May Creek Trail South Soft Surface Trail and Bridge Project September 2024 Renton, Washington Page 8 of 29 the proposed project. The action area (Figure 2) has been established based on the following: • The project footprint. • The extent of temporarily elevated terrestrial noise levels associated with construction activities. • The extent of temporary effects to water quality during construction. 2.4.1 Project Footprint The action area includes the overall footprint of the proposed action, which includes the locations of the trail alignment and bridge as well as the grading activities associated with the trail and the excavation and fill required for the bridge abutments. The action area also includes the locations of equipment and material staging, which will occur in an upland portion of the site. Figure 2 Project Action Area 2.4.2 Temporarily Elevated Terrestrial Noise Baseline and construction-related terrestrial noise levels were inferred using a technique recommended by WSDOT (WSDOT, 2018). That guidance includes information regarding average noise levels associated with construction equipment and noise attenuation data from the Federal Transit Administration’s (FTA) Transit Noise and Vibration Impact Assessment Guidance (FTA, 2006). DRAFT Biological Assessment WSP USA, 30902211.000 City of Renton, May Creek Trail South Soft Surface Trail and Bridge Project September 2024 Renton, Washington Page 8 of 29 The project has the potential to generate low levels of terrestrial noise during construction. Table 1 below provides a list of the standard construction equipment that will be required during construction, and the maximum terrestrial noise levels anticipated. The greatest noise will be produced by the simultaneous use of excavators, pile installation methods, and an air hammer. Using the rules for decibel addition, the peak terrestrial noise level of 85 decibels (dBA) generated by the air hammer and pile driving would be increased by 2 dBA. Therefore, the peak terrestrial noise generated during project construction would be approximately 87 dBA. Table 1. Project Equipment and Terrestrial Noise Levels Equipment Purpose Maximum Terrestrial Noise Level (dBA at 50 feet) Air Compressors Pneumatic Equipment 70 Dump Trucks Earthwork and Grading 76 Excavators Earthwork and Grading 81 Micro Pile Driving Anchor Installation 85 Air Hammer Anchor Installation 85 The project site is bordered by Interstate 405 (I-405) to the east and bordered by Lake Washington Boulevard N and dense neighborhood to the west. WSDOT’s Annual Traffic Report (WSDOT, 2016) estimates traffic levels on I-405 at approximately 6,208 vehicles per hour. Using a more conservative estimate of 6,000 vehicles per hour at the given speed limit of 60 mph, ambient noise levels from traffic at the project site are estimated at 63.2 dBA at 50 feet. Soft site conditions were assumed for noise attenuation purposes because most of the surrounding landscape consists of ground cover. Soft site conditions result in an additional 1.5 dBA reduction per doubling distance as it spreads from the source. Added to the standard reduction rate for soft site conditions, point source noise attenuates at a rate of 7.5 dBA of doubling distance (WSDOT, 2018). Table 2. Project-Related Terrestrial Noise Attenuation Distance from source (ft) Construction Noise in dBA (Point Source, Soft Site) (-7.5 dBA reduction per doubling of distance) 50 87 100 79.5 200 72 400 64.5 800 57 Based on the noise attenuation assumptions described above, terrestrial noise from construction is expected to attenuate to the ambient level of approximately 63.2 dBA (estimated ambient noise level of adjacent traffic) within between approximately 400 and 800 feet from the location of project activities. For purposes of this consultation, the more conservative 800 ft distance has been used to estimate the maximum extent of detectable terrestrial noise. DRAFT Biological Assessment WSP USA, 30902211.000 City of Renton, May Creek Trail South Soft Surface Trail and Bridge Project September 2024 Renton, Washington Page 8 of 29 2.4.3 Temporarily Elevated Underwater Noise No work within May Creek is proposed by the project. All work will occur above the OHWM and floodway, and the only work proposed within the 100-year floodplain is an approximately 50 ft length soft trail at Spur 2. May Creek will not experience elevated underwater noise from the project. 2.4.4 Temporarily Elevated Turbidity Grading activities will occur during trail installation and will occur mainly in the areas south of May Creek and near Wetlands A, C and D. While there is no direct in- water work, there is the potential for erosion and subsequent sediment delivery to May Creek. According to the State of Washington Water Quality Standards in Chapter 173-201A WAC, the allowable temporary mixing zone during and immediately after in-water activities in waters with flows above 100 cubic feet per second (cfs) is 300 feet downstream from the activity causing the turbidity. The zone of influence for temporary impacts to water quality during construction is estimated to be limited to an area up to 300 feet downstream of each in-water work location. Listed fish occur within the aquatic stormwater zone of influence. Silt fence will be installed and monitored to prevent disturbed material from being transported via sheet flow to May Creek. 3.0 STATUS OF SPECIES AND CRITICAL HABITAT This section discusses the ESA-listed species and critical habitat known to occur, or with the potential to occur, within the action area (see Appendices B and C for the species lists and essential fish habitat (EFH) summary). Information for this BA regarding listed species was obtained from USFWS website resources (USFWS, 2023) and NOAA NMFS website resources (NOAA NMFS, 2023) on February 13, 2023. Additional information came from the WDFW Priority Habitat and Species (PHS) (WDFW 2023) and SalmonScape databases (WDFW 2023a). Critical habitat is not identified at or near the action area by NOAA NMFS for the species listed in Table 3. Critical habitat for Chinook Salmon, Puget Sound ESU is identified in Lake Washington, approximately 1,800 ft downstream and several culverts away from the action area. Table 3. Species Listed under the ESA Addressed in this BA Species Name ESA Listing Status Critical Habitat Critical Habitat in Action Area Common Name Scientific Name ESU or DPS* Chinook Salmon Oncorhynchus tshawytscha Puget Sound ESU Threatened Designated No Steelhead Trout Oncorhynchus mykiss Puget Sound DPS Threatened Designated No Bull Trout Salvelinus confluentus Coastal Puget Sound DPS Threatened Designated No *ESU =Evolutionarily Significant Unit; DPS=Distinct Population Segment DRAFT Biological Assessment WSP USA, 30902211.000 City of Renton, May Creek Trail South Soft Surface Trail and Bridge Project September 2024 Renton, Washington Page 8 of 29 According to WDFW PHS the species listed in Table 4 do occur, or may occur, within May Creek, but are not discussed further in this BA as they do not have an ESA-listed status (WDFW 2023). Table 4. Non-ESA-Listed Species Not Addressed in this BA Species Name ESA Listing Status Critical Habitat Critical Habitat in Action Area Common Name Scientific Name ESU or DPS* Coho Salmon Oncorhynchus kisutch NA NA NA No Cutthroat Trout Oncorhynchus clarki NA NA NA No Sockeye Salmon Oncorhynchus nerka NA NA NA No *NA = Not Applicable According to the USFWS and NOAA NMFS species lists, although the species listed in Table 5 and/or their designated critical habitat do occur, or may occur, within King County (County) and May Creek, they are not addressed in this BA for the reasons discussed below (USFWS, 2023). Table 5. Species Listed under the ESA but Not Addressed in this BA Species Name ESA Listing Status Common Name Scientific Name North American Wolverine Gulo gulo luscus Proposed Threatened Marbled Murrelet Brachyramphus marmoratus Threatened Yellow-Billed Cuckoo Coccyzus americanus Threatened Monarch Butterfly Danaus plexippus Candidate While information from USFWS (USFWS, 2023) identified the potential for North American wolverine, marbled murrelet, yellow-billed cuckoo, and monarch butterfly to occur within the County, WDFW PHS data does not indicate any known occurrence of these species within the action area. In addition, the project site and action area is bordered by Interstate 405 (I-405) to the east and bordered by Lake Washington Boulevard N and dense neighborhood to the west. Due to the dense urban setting, the action area does not provide any suitable habitat for these species. Based on the lack of suitable habitat for the species listed in Table 5, it is determined that the proposed project will have no effect on them, and they are not addressed further in this BA. 4.0 BIOLOGICAL REQUIREMENTS This section describes the biological requirements of the listed species that have the potential to occur within the action area. These descriptions include run timing, biological requirements, and factors affecting recovery. DRAFT Biological Assessment WSP USA, 30902211.000 City of Renton, May Creek Trail South Soft Surface Trail and Bridge Project September 2024 Renton, Washington Page 8 of 29 4.1 CHINOOK SALMON (ONCORHYNCHUS TSHAWYTSCHA) The Puget Sound ESU of Chinook salmon includes all naturally spawned populations of Chinook salmon from rivers and streams flowing into Puget Sound (70 Federal Register [FR] 52630). Puget Sound ESU Chinook salmon are listed as threatened by NOAA NMFS under the ESA (NOAA NMFS, 2023). Critical habitat for Puget Sound Chinook salmon was designated in 2005 and consists of river and marine nearshore habitat within the Puget Sound basin. Critical habitat for Puget Sound Chinook salmon is not present within the action area (NOAA NMFS, 2023a). 4.1.1 Distribution and Habitat Requirements Compared to the other Pacific salmon, Chinook salmon have the most complex life history with a large variety of patterns. The length of freshwater and saltwater residency varies greatly (Myers et al. 1998). Channel size and morphology, substrate size and quality, water quality, and cover type and abundance may influence distribution and abundance of Chinook salmon (Lower Columbia Fish Recovery Board [LCFRB] 2004). After three to five years in the ocean, Puget Sound stocks return to the local rivers and tributaries to spawn in the spring and fall. Spawning occurs in the main stems of larger tributaries in coarse gravel and cobble (Myers et al. 1998). Most juvenile summer/fall Chinook salmon in the river systems discharging to the Puget Sound migrate to the marine environment as smolts during their first year, although their early life history patterns vary. Some migrate downstream almost immediately after emerging from the gravel. Others migrate downstream and enter side channels where they may rear for several weeks before migrating to marine waters. A third life-history strategy involves a more extended rearing time (up to two years) in the river before migrating to salt water. 4.1.2 Status Chinook salmon populations are significantly reduced from historic levels. The Puget Sound ESU has shown a precipitous drop since 1973, and the stock status is currently identified as critical (Smith 2003). Habitat degradation associated with stream blockages, channelization, contamination, forest practices, and urbanization are listed as the primary causes of decline in the Puget Sound ESU Chinook salmon population. 4.1.3 Presence in Action Area Although May Creek and its tributaries do not provide physical habitat elements that would support a large presence of chinook salmon, there has been an historic run of chinook in May Creek (King County, 2001). Juvenile chinook may enter May Creek from Lake Washington where smolts use the lake primarily as a migration corridor. This species may be found breeding in the action area and migrating through the action area toward Puget Sound in fall months during the fall run. 4.2 STEELHEAD (ONCORHYNCHUS MYKISS) Puget Sound DPS steelhead are listed as threatened by NOAA NMFS under the ESA (11 May 2007; 72 FR 26722) (NOAA NMFS, 2023). Critical habitat was proposed for Puget Sound DPS steelhead on March 25, 2016 and includes estuarine and riverine habitat and is not listed in May Creek or Lake Washington. Critical habitat DRAFT Biological Assessment WSP USA, 30902211.000 City of Renton, May Creek Trail South Soft Surface Trail and Bridge Project September 2024 Renton, Washington Page 8 of 29 for Puget Sound DPS steelhead is not present within the action area (NOAA NMFS, 2023a). 4.2.1 Distribution and Habitat Requirements Steelhead is a more widely distributed anadromous fish than salmonids. Spawning occurs throughout the winter and spring seasons. Summer-run fish populations are smaller than winter-run fish as they use a smaller portion of stream for spawning. Wild fish mature for up to two years in freshwater habitat and migrate quickly to the open ocean, bypassing the use of shallow, nearshore habitat (Behnke 1992). Adult steelhead trout will spend up to three years in the open ocean before returning to their rearing grounds (NOAA, 2016). Steelhead use a variety of habitats throughout the freshwater portion of their life history. As with all salmonid species, water temperatures and intra-gravel flow are also important for spawning and incubation. After fry emerge from the gravels, they seek complex habitat of boulders, rootwads, and woody material along the stream margins. As juveniles get older and larger, they move downstream to rear in larger tributaries and main stem rivers. Undercut banks, large woody debris (LWD), and boulders are all used by larger juveniles. 4.2.2 Status Factors contributing to the decline of Puget Sound DPS steelhead include blocked access to historical habitat, habitat degradation, channelization, contamination, forest practices, and urbanization. The primary limiting factors for this DPS are degradation and fragmentation of freshwater habitat. Most populations of this DPS are declining annually by between 3 to 10 percent with a moderate to high extinction risk within 100 years (NOAA NMFS, 2011). 4.2.3 Presence in Action Area The Cedar River drains to lower Lake Washington approximately 1 mile from the action area, which connects to Puget Sound. This corridor is used by wild winter-run steelhead from February through April while hatchery fish run from mid-November through mid-February. This species may be found resting in the action area during migration. 4.3 BULL TROUT (SALVELINUS CONFLUENTUS) The Puget Sound DPS bull trout are listed as threatened by the USFWS under the ESA. Critical habitat for Puget Sound DPS bull trout was designated in 2005 and consists of marine areas and various rivers and creeks (70 FR 56212-56311) including Lake Washington. The Puget Sound DPS includes all natural spawning populations of bull trout in the Puget Sound basin, including in the streams that flow into Puget Sound. The Puget Sound DPS bull trout is a federal threatened species. Bull trout are piscivorous and are the only native char. 4.3.1 Distribution and Habitat Requirements Compared to other salmonids, bull trout are thought to have more specific habitat requirements and are most often associated with undisturbed habitat with diverse DRAFT Biological Assessment WSP USA, 30902211.000 City of Renton, May Creek Trail South Soft Surface Trail and Bridge Project September 2024 Renton, Washington Page 8 of 29 cover and structure. Spawning and rearing are thought to be primarily restricted to relatively pristine cold streams, often within headwater reaches (Rieman and McIntyre 1993). Adults can reside in lakes, reservoirs, and coastal areas or they can migrate to salt water (63 FR 31647). Juveniles are typically associated with shallow backwater or side-channel areas, while older individuals are often found in deeper pools sheltered by large organic debris, vegetation, or undercut banks (63 FR 31467). Water temperature is also a critical factor for bull trout, and areas where water temperature exceeds 59°F (15°C) are thought to limit distribution (Rieman and McIntyre 1993). 4.3.2 Status Key factors in the decline of bull trout populations include harvest by anglers, impacts to watershed biological integrity, and the isolation and fragmentation of populations. Changes in sediment delivery (particularly to spawning areas), degradation and scouring, shading (high water temperature), water quality, and low hydrologic cycles adversely affect bull trout. Therefore, impacted watersheds are negatively associated with current populations. Additionally, bull trout appear to be affected negatively by non-native trout species through competition and hybridization. 4.3.3 Presence in Action Area Migratory bull trout move to larger bodies of water to overwinter and then migrate back to smaller waters to reproduce. Although May Creek and its tributaries do not provide physical habitat elements that would support a large presence of bull trout, there has been an observed historic run of bull trout in May Creek (King County, 2001). This species may be found resting in the action area during migration. 4.4 CRITICAL HABITAT DESIGNATION FOR EACH ESU/DPS This section describes the critical habitat designations and/or proposals for each ESA- listed species that could potentially occur within the action area. 4.4.1 Chinook Salmon Although critical habitat is designated for chinook salmon, critical habitat for this species does not occur within May Creek and the action area. 4.4.2 Steelhead Although critical habitat was designated on February 24, 2016 for Puget Sound steelhead, critical habitat for this species does not occur within May Creek and the action area. 4.4.3 Bull trout Although critical habitat was designated on October 18, 2010 for Coastal Puget Sound bull trout, critical habitat for this species does not occur within May Creek and the action area. DRAFT Biological Assessment WSP USA, 30902211.000 City of Renton, May Creek Trail South Soft Surface Trail and Bridge Project September 2024 Renton, Washington Page 8 of 29 4.5 PRIMARY CONSTITUENT ELEMENTS This section consists of a discussion of the primary constituent elements (PCEs) that have been identified for ESA-listed chinook salmon, steelhead, and bull trout, and the potential for their presence within the action area. 1. Freshwater spawning sites with water quantity and quality conditions and substrate supporting spawning, incubation, and larval development. Action area: The action area includes the freshwater habitat of May Creek. The substrate within the action area is primarily course gravels and cobbles with low sedimentation. May Creek water quality is determined to be poor (Kerwin, 2001). This PCE is present within the action area. 2. Freshwater rearing sites with water quantity and floodplain connectivity to form and maintain physical habitat conditions and support juvenile growth and mobility; water quality and forage supporting juvenile development; and natural cover, such as shade, submerged and overhanging large wood, log jams and beaver dams, aquatic vegetation, large rocks and boulders, side channels, and undercut banks. Action area: The action area includes the freshwater habitat of May Creek which contains natural cover such as overstory shade, LWD, and riparian vegetation. May Creek riparian habitat, LWD, hydrology, and pools are determined to be poor (Kerwin, 2001). This PCE is present within the action area. 3. Freshwater migration corridors free of obstruction with water quantity and quality conditions and natural cover, such as submerged and overhanging large wood, aquatic vegetation, large rocks and boulders, side channels, and undercut banks supporting juvenile and adult mobility and survival. Action area: The action area includes the freshwater habitat of May Creek. Three downstream creek crossings are identified as not a barrier (WDFW, 2023a). May Creek contains natural cover such as overstory shade, LWD, and riparian vegetation. May Creek water quality, riparian habitat, LWD, hydrology, and pools are determined to be poor (Kerwin, 2001). This PCE is present within the action area. 4. Estuarine areas free of obstruction with water quality, water quantity and salinity conditions supporting juvenile and adult physiological transitions between fresh and salt water; natural cover, such as submerged and overhanging large wood, aquatic vegetation, large rocks and boulders, and side channels, and juvenile and adult forage, including aquatic invertebrates and fishes, supporting growth and maturation. Action area: The action area includes the freshwater habitat of May Creek. Estuarine habitat is not present within the action area and, therefore, this PCE is not present within the action area. 5. Nearshore marine areas free of obstruction with water quality and quantity conditions and forage, including aquatic invertebrates and fishes, supporting growth and maturation; and natural cover, such as submerged and DRAFT Biological Assessment WSP USA, 30902211.000 City of Renton, May Creek Trail South Soft Surface Trail and Bridge Project September 2024 Renton, Washington Page 8 of 29 overhanging large wood, aquatic vegetation, large rocks and boulders, and side channels. Action area: The action area includes the freshwater habitat of May Creek and nearshore marine waters are not present within the action area. This PCE is not present within the action area. 6. Offshore marine areas with water quality conditions and forage, including aquatic invertebrates and fishes, supporting growth and maturation. Action area: There are no offshore marine areas within the action area. This PCE is not present within the action area. 5.0 ENVIRONMENTAL BASELINE This section outlines the presence and condition of aquatic and terrestrial habitat features within the action area as they pertain to the species addressed in this BA. The following sections summarize the baseline habitat conditions at both the action area and watershed scales, and then analyze the likely effects that the proposed action would have on the baseline conditions at both scales. 5.1 GENERAL SETTING The project site in Renton, Washington, is bordered by Interstate 405 (I-405) to the east and bordered by Lake Washington Boulevard N and dense neighborhood to the west. May Creek runs through the site, with an existing nature trail positioned to the north, and four (4) wetlands located at the Park. The City of Renton owns the May Creek Park parcels. Adjacent parcels are developed with single-family residences in dense neighborhoods, apartment buildings, and commercial businesses. Lake Washington is located to the west and City of Renton is located south. 5.2 TERRESTRIAL HABITAT The majority of the site consists of undeveloped forest outside of the existing trail alignment to the north of May Creek. Vegetation species noted throughout the study area include an overstory of Douglas’ fir (Pseudotsuga menziesii), western hemlock (Tsuga heterophylla), bigleaf maple (Acer macrophyllum), red alder (Alnus rubra), black cottonwood (Populus balsamifera), and western red cedar (Thuja plicata), and an understory of Pacific willow (Salix lasiandra), Sitka willow (Salix sitchensis), evergreen huckleberry (Vaccinium ovatum), western skunk cabbage (Lysichiton americanus), lady fern (Athyrium felix-femina), western common horsetail (Equisetum arvense) and non-native Himalayan blackberry (Rubus armeniacus) Japanes/Bohemian knotweed (Reynoutria bohemica), among other plant species. The project is surrounded by dense urban development and major arterial roadways. 5.3 RIPARIAN AND AQUATIC HABITAT May Creek consists of a shallow streambed with small rock and pebble substrate, deposited in washes, riffles, and pools. May Creek outfalls to Lake Washington DRAFT Biological Assessment WSP USA, 30902211.000 City of Renton, May Creek Trail South Soft Surface Trail and Bridge Project September 2024 Renton, Washington Page 8 of 29 approximately 1,800 ft east of the project area, after passing through at least three (3) culverts. May Creek water quality, riparian habitat, LWD, hydrology, and pools are determined to be poor (Kerwin, 2001). The project is surrounded by dense urban development and major arterial roadways. 6.0 INDICATORS ANALYSIS An evaluation of the baseline watershed habitat conditions within the action area was conducted according to the guidance outlined in Making Endangered Species Act Determinations of Effect for Individual or Grouped Actions at the Watershed Scale (NOAA NMFS, 1996). This section outlines the presence and condition of physical, chemical, and biological habitat indicators within the action area as they pertain to the species and habitat addressed in this BA. The section summarizes the baseline habitat conditions within the action area and then analyzes the likely effects that the proposed action will have on the baseline conditions to determine whether the proposed action would restore, maintain, or degrade existing baseline conditions at the action area and watershed level. Table 6 shows the results of this analysis. In general, the environmental baseline conditions within the action area are functioning. As indicated in Table 6, most of the indicators of environmental condition are properly functioning, or are functioning at risk, at both the action area and watershed scales. There is functioning estuarine or intertidal habitat within the action area. Table 6. Overview of Environmental Baseline Conditions at Action Area and Watershed Scales Diagnostic/Pathway Indicators Baseline Environmental Conditions Effects of Project Activities Water Quality Temperature PF Maintain Sediment/Turbidity PF Maintain Chemical Contamination/Nutrients NPF Maintain Habitat Access Physical Barriers PF Maintain Habitat Elements Substrate PF Maintain Large Woody Debris NPF Maintain Pool Frequency NPF Maintain Pool Quality NPF Maintain Off-Channel Habitat NPF Maintain Refugia PF Maintain Channel Conditions/Dynamics Width/Depth Ratio PF Maintain Shoreline Condition PF Maintain DRAFT Biological Assessment WSP USA, 30902211.000 City of Renton, May Creek Trail South Soft Surface Trail and Bridge Project September 2024 Renton, Washington Page 8 of 29 Diagnostic/Pathway Indicators Baseline Environmental Conditions Effects of Project Activities Floodplain Connectivity NPF Maintain Flow/Hydrology Change in Peak/Base Flows NPF Maintain Increase in Drainage Network PF Maintain Watershed Conditions Road Density and Location NPF Maintain Disturbance History NPF Maintain Riparian Reserves PF Maintain Notes: NPF-Not Properly Functioning; PF=Properly Functioning; NA-Not Applicable 6.1 WATER QUALITY 6.1.1 Water Temperature King County routinely monitors the ecological health of May Creek in a variety of ways, including collecting and analyzing water, sediment, and benthic invertebrate samples since 1972. Water quality samples have been collected monthly near the mouth of May Creek at station 0440, which is located at the gaging station near the bridge on Lake Washington Blvd and SE 80th St. Water quality monitoring data indicates temperatures in May Creek near the project site average 10.2 degrees C (King County, 2023), below the optimal salmon habitat temperature threshold of 12 C. Within the action area and watershed, baseline conditions for water temperature are determined to be properly functioning. The proposed action will maintain this indicator at both the action area and watershed scales. The project activities will have no measurable long-term effects on water temperature within May Creek. 6.1.2 Sediment/Turbidity Sediments near the action area in May Creek are predominantly fine-grained, organically enriched material. The average level of turbidity within May Creek within the action area is low, based on King County Water Quality Monitoring (King County, 2023). Within the action area and watershed scales, baseline conditions for sediment and turbidity are determined to be properly functioning. The proposed action will maintain this indicator at both the action area and watershed scales. The project activities will have no measurable long-term effects on turbidity within May Creek. 6.1.3 Chemical Contamination/Nutrients King County Water Quality Monitoring identify the average mg/L of Total Suspended Solids (TSS), Phosphorus, Ammonia, Nitrate, and Nitrogen to be below the maximum measured in 50 years of monitoring (King County, 2023). May Creek water quality is determined to be poor (Kerwin, 2001). Within the action area and DRAFT Biological Assessment WSP USA, 30902211.000 City of Renton, May Creek Trail South Soft Surface Trail and Bridge Project September 2024 Renton, Washington Page 8 of 29 watershed, baseline conditions for chemical and nutrient contamination are determined to be not properly functioning. The proposed action will maintain this indicator at both the action area and watershed scales. The project activities will have no measurable long-term effects on chemical contamination or nutrient loading within May Creek. 6.2 HABITAT ACCESS 6.2.1 Physical Barriers There are no barriers to fish migration within the action area. For this reason, within the action area, baseline conditions for physical barriers are determined to be properly functioning. The proposed action will maintain this indicator at both the action area and watershed scales. The proposed activities will not pose a significant barrier to fish passage at any range of flow at either the action area or the watershed scale. 6.3 HABITAT ELEMENTS 6.3.1 Substrate Sedimentation in May Creek is low (King County, 2023). The existing streambed consists of a shallow streambed with small rock and pebble substrate, deposited in washes, riffles, and pools. Within the action area, as well as at the watershed scale, baseline conditions for substrate are determined to be properly functioning. The proposed action will maintain this indicator at both the action area and watershed scales in the long term. The project activities will have no measurable long-term effects on habitat substrate within May Creek. 6.3.2 Large Woody Debris May Creek contains some large woody debris (LWD) located on the stream banks and found in stream crossings. May Creek riparian habitat and LWD is determined to be poor (Kerwin, 2001). Within the action area, baseline conditions for LWD are determined to be not properly functioning. The proposed action will maintain this indicator at both the action area and watershed scales in the long term. The proposed activities will not result in any impacts to riparian vegetation or habitat. 6.3.3 Pool Frequency May Creek winds through the project site and contains some shallow pool habitats within the action area. May Creek pools are determined to be poor (Kerwin, 2001). Therefore, within the action area, baseline conditions for pool frequency are determined to be not properly functioning. DRAFT Biological Assessment WSP USA, 30902211.000 City of Renton, May Creek Trail South Soft Surface Trail and Bridge Project September 2024 Renton, Washington Page 8 of 29 The proposed action will maintain this indicator at both the action area and watershed scales. The proposed activities will not result in any impacts to pool habitat at either the action area or watershed scale. 6.3.4 Pool Quality Some shallow pool habitats exist within the action area. May Creek pools are determined to be poor (Kerwin, 2001). Within the action area, baseline conditions for pool quality are determined to be not properly functioning. The proposed action will maintain this indicator at both the action area and watershed scales. The proposed activities will not result in any impacts to pool habitat at either the action area or watershed scale. 6.3.5 Off-Channel Habitat Though there are no side channels located at the project site, there is healthy riparian habitat and stream channels exist both up- and down-stream. Baseline conditions for off-channel habitat are not properly functioning within the action area. The proposed action will maintain this indicator at both the action area and watershed scales. The proposed activities will not result in any impacts to off-channel habitat at either the action area or watershed scale. 6.3.6 Refugia The shoreline within the action area consists of LWD, cobbles, and riparian vegetation. Vegetation at the top of the bank generally consists of native and non- native plants, including overstory of Douglas’ fir (Pseudotsuga menziesii), western hemlock (Tsuga heterophylla), bigleaf maple (Acer macrophyllum), red alder (Alnus rubra), black cottonwood (Populus balsamifera), and western red cedar (Thuja plicata), and an understory of Pacific willow (Salix lasiandra), Sitka willow (Salix sitchensis), evergreen huckleberry (Vaccinium ovatum), western skunk cabbage (Lysichiton americanus), lady fern (Athyrium felix-femina), western common horsetail (Equisetum arvense) and non-native Himalayan blackberry (Rubus armeniacus) Japanes/Bohemian knotweed (Reynoutria bohemica), among other plant species. Baseline conditions for refugia within the action area and watershed scales are properly functioning. The proposed action will maintain this indicator at both the action area and watershed scales. The proposed activities will not result in any impacts to the quality or quantity of refugia at either the action area or watershed scale. 6.4 CHANNEL CONDITIONS AND DYNAMICS 6.4.1 Width/Depth Ratio Channelized areas of May Creek have an approximate width to depth ratio of 10:1. This channel condition applies to rivers, not lakes. Baseline conditions for channel conditions are properly functioning within the action area. DRAFT Biological Assessment WSP USA, 30902211.000 City of Renton, May Creek Trail South Soft Surface Trail and Bridge Project September 2024 Renton, Washington Page 8 of 29 The proposed action will maintain this indicator at both the action area and watershed scales in the long term. The proposed activities will not result in any impacts to the channel width/depth at either the action area or watershed scale. 6.4.2 Streambank Condition The streambank in the action area is undeveloped natural riparian habitat, consisting of shallow side slopes, LWD, and vegetation. The indicator for streambank condition within the action area is properly functioning. The proposed action will maintain this indicator at both the action area and watershed scales in the long term. The proposed activities will not result in any significant impacts to streambank condition at either the action area or watershed scale. 6.4.3 Floodplain Connectivity There is floodplain habitat within the action area, however, historical development has led to a condition where most of the terrestrial portion near the action area is completely or partially removed from the floodplain. Conditions are similar throughout the watershed (Kerwin, 2001). May Creek floodplain connectivity is determined to be poor (Kerwin, 2001). Therefore, within the action area and at the watershed scale, floodplain connectivity is determined to be not properly functioning. The proposed action will maintain this indicator at both the action area and watershed scales in the long term. The proposed activities will not result in any impacts to floodplain connectivity within the action area or watershed scale. 6.5 FLOW/HYDROLOGY 6.5.1 Change in Peak/Base Flows May Creek is a natural stream, but upstream and surrounding historical development have removed pervious surface from the watershed and have altered drainage patterns. May Creek hydrology is determined to be poor (Kerwin, 2001). Therefore, within the action area and at the watershed scale, change in peak/base flows are determined to be not properly functioning. The proposed action will maintain this indicator at both the action area and watershed scales in the long term. The proposed activities will not result in any impacts to peak/base flows within the action area or at the watershed scale. 6.5.2 Increase in Drainage Network Stormwater and surface water runoff is high because of development of the surrounding area, which has led to increased inputs to May Creek. May Creek 100- year floodplain at the action area is within May Creek Park. Therefore, within the action area and at the watershed scale, an increase in drainage network is determined to be properly functioning. DRAFT Biological Assessment WSP USA, 30902211.000 City of Renton, May Creek Trail South Soft Surface Trail and Bridge Project September 2024 Renton, Washington Page 8 of 29 The proposed action will maintain this indicator at both the action area and watershed scales in the long term. The proposed activities will not result in any impacts to the drainage network within the action area or at the watershed scale. 6.6 WATERSHED CONDITIONS 6.6.1 Road Density and Location Road density surrounding the action area is high because of urban development. Therefore, the indicator for road density and location at both the action area and watershed is not properly functioning. The proposed action will maintain this indicator at both the action area and watershed in the long term. 6.6.2 Disturbance History Disturbance levels within the action area are above the threshold for proper functioning because of surrounding urban development including dense neighborhoods and adjacent roadways. The indicator for disturbance history within the action area is not properly functioning. The proposed action will maintain this indicator at both the action area and watershed scales in the long term. The proposed activities will not result in any significant amount of disturbance at either the action area or the watershed scale. 6.6.3 Riparian Reserves In general, riparian vegetation adjacent to the action area is composed of deciduous trees and maintains processes to keep the aquatic ecosystem functioning properly. This indicator is determined to be properly functioning at the action area and watershed scales. The proposed action will maintain this indicator at both the action area and watershed scales in the long term. 6.7 PATHWAYS AND INDICATORS SPECIFIC TO BULL TROUT ONLY The USFWS provides a matrix of pathways and indicators specific to bull trout. The proposed action will not affect these indicators significantly; therefore, they are not addressed in detail here. The specific indicators are as follows. • Subpopulation size • Growth and survival • Life history diversity and isolation • Persistence and genetic integrity • Integration of species and habitat conditions The proposed action will maintain all of these indicators at both the action area and watershed scales in the long term. It is possible that bull trout may be present when overwater work is being conducted, but bull trout are likely not present within the DRAFT Biological Assessment WSP USA, 30902211.000 City of Renton, May Creek Trail South Soft Surface Trail and Bridge Project September 2024 Renton, Washington Page 8 of 29 action area for significant periods. The proposed activities will have no measurable effect on any of the indicators of proper functioning condition for bull trout habitat. 7.0 EFFECTS OF THE ACTION 7.1 DIRECT EFFECTS Direct effects are the direct or immediate impacts of the proposed action to federally listed species and their habitat. This section addresses potential direct effects that listed species and critical habitats could experience because of the proposed action and the likely response to each potential direct effect. 7.1.1 Water Quality Overwater work activities associated with bridge abutment and bridge installation have the potential for direct water-quality impacts. Construction debris can enter the waterway during construction activities. There is also slight potential for leaks and spills of fuel, hydraulic fluids, lubricants, and other chemicals from equipment and storage containers associated with the project. Discharge of vehicle and equipment wash water, etc., could also add pollutants that could enter the water. The contractor will be required to provide and implement impact minimization measures and BMPs. Additional BMPs have been included to avoid any potential impacts from hazardous materials. These BMPs include inspecting construction equipment daily to ensure there are no leaks of hydraulic fluids, fuel, lubricants, or other petroleum products and locating temporary material and equipment staging areas above the OHWM of the action area waterbody and outside environmentally sensitive areas. The following ESA-listed species have the potential to be exposed to the direct effects of temporarily decreased water quality conditions that could occur within the action area during project construction. • Puget Sound ESU Chinook salmon • Puget Sound DPS steelhead • Coastal Puget Sound DPS bull trout During the overwater work period, migrating adult salmon and foraging and migrating steelhead and bull trout could be present within the action area. These species, if present during construction, would likely be moving through the action area and would not be present within the action area for any significant period. It is possible that migrating adult and/or rearing juvenile salmon, steelhead, and bull trout could be present within the action area and could be exposed to temporarily decreased water quality conditions, such as potential debris contamination. The geographic extent and duration of any potential short-term decreases in water quality conditions are expected to be limited to within 150 feet of the work area, and the BMPs implemented for the proposed action will be sufficient to minimize any effects. DRAFT Biological Assessment WSP USA, 30902211.000 City of Renton, May Creek Trail South Soft Surface Trail and Bridge Project September 2024 Renton, Washington Page 8 of 29 7.1.2 Noise The project is anticipated to generate insignificant levels of underwater noise. As all work will be conducted in the dry, the project is not expected to measurably elevate underwater noise. The levels of terrestrial noise that will be generated will be minimal and are not expected to be elevated significantly above the ambient noise levels at the site. Ambient noise levels at the site are approximated at 63.2 decibels, based on traffic volume and speed on I-405 adjacent to the site (WSDOT 2018). Terrestrial noise from construction is expected to attenuate to the ambient level of approximately 63.2 dBA within between approximately 400 and 800 feet from the location of project activities. No measurable or significant effects related to terrestrial or underwater noise are anticipated from project activities. 7.1.3 Direct Habitat Impacts The proposed bridge and abutment work will occur above the OHWM, floodway, and 100-year floodplain and will not result in any increase in benthic impacts. The bridge will span May Creek and will contribute to overwater coverage within the action area, though the bridge will have grating to minimize this coverage. Boardwalk trail sections will cross Wetland C. While Wetland C will be impacted during construction, the boardwalk trail section will be supported by micro piles and will not involve fill within the wetland, and the surface will be a timber boardwalk with slatted timber decking to allow for drainage and allow for light penetration. This design and the location of the boardwalk sections to cross the wetland in its smallest width is not anticipated to have significant impact to Wetland C. The project includes removal and maintenance of invasive species, and the implementation of vegetation enhancements. Vegetation enhancements consist of reestablishing native riparian communities within wetland and stream buffer on site (Appendix A). All proposed vegetation enhancement will occur within the Riparian Buffer Zone of 250-feet as designated by NMFS. Vegetation enhancements will improve riparian habitat function within the floodplain. 7.2 INDIRECT EFFECTS Indirect effects are defined as those effects that are caused by or result from the proposed action that are later in time but still reasonably certain to occur. The proposed action will likely result in an increase in pedestrian traffic at the May Creek Trail and increased pedestrian traffic over May Creek. This increase in pedestrian traffic may affect ESA-listed species by the addition of outside contaminants and debris due to foot traffic. This indirect effect is anticipated to be insignificant compared to existing upstream contaminants and existing effects due to the urban environment. 7.3 EFFECTS FROM INTERDEPENDENT AND INTERRELATED ACTIONS Interdependent actions are defined as those actions having no independent utility apart from the proposed action (50 Code of Federal Regulations [CFR] §402-02). DRAFT Biological Assessment WSP USA, 30902211.000 City of Renton, May Creek Trail South Soft Surface Trail and Bridge Project September 2024 Renton, Washington Page 8 of 29 Interdependent actions are typically “because of” the proposed action. Interrelated actions are defined as those actions that are part of a larger action and depend on the larger action for their justification (50 CFR §402-02). Interrelated actions are typically “associated with” the proposed action. Interdependent and interrelated actions may include the trail construction and improvements, and any future trail maintenance or May Creek Trail improvements. Interrelated actions associated with the Project may be the grading associated with the trial installation. Grading activities will occur during trail installation and will occur mainly in the areas south of Wetland A and Wetland C. Silt fence will be installed to prevent excavated material from entering May Creek, and the area will be stabilized on Project completion. For actions that occur during construction, the contractor will provide the BMPs discussed in Section 2.3. 7.4 EFFECTS DETERMINATIONS FOR LISTED SPECIES AND DESIGNATED CRITICAL HABITAT Based on the description of the proposed action and the analysis provided in this document, Table 7 lists the effects determinations for ESA-listed species and species proposed for listing, while Table 8 shows the effects determinations for designated critical habitats. A summary description of how these effects determinations were reached for each species and critical habitat follows the tables. Table 7. Effects Determinations Summary – Species Species ESU/DPS Federal Status Effect Determination Chinook Salmon Puget Sound ESU Threatened NLTAA Steelhead Puget Sound DPS Threatened NLTAA Bull Trout Coastal Puget Sound DPS Threatened NLTAA Notes: LTAA = Likely to Adversely Affect; NLTAA = Not Likely to Adversely Affect; NE = No Effect; ESU = Evolutionarily Significant Unit; DPS = Distinct Population Segment Table 8. Effects Determinations Summary - Critical Habitats Species ESU/DPS Critical Habitat Status Effect Determination Chinook Salmon Puget Sound ESU Designated NE Steelhead Puget Sound DPS Designated NE Bull Trout Puget Sound DPS Designated NE NLTAA = Not Likely to Adversely Affect; NE = No Effect; NA = Not Applicable; ESU = Evolutionarily Significant Unit; DPS = Distinct Population Segment DRAFT Biological Assessment WSP USA, 30902211.000 City of Renton, May Creek Trail South Soft Surface Trail and Bridge Project September 2024 Renton, Washington Page 8 of 29 7.4.1 Species Puget Sound ESU Chinook Salmon, Puget Sound DPS Steelhead, and Coastal Puget Sound DPS Bull Trout The proposed action “may affect, but is not likely to adversely affect” Puget Sound ESU Chinook salmon, Puget Sound DPS steelhead, and Coastal Puget Sound DPS bull trout. This determination is warranted based on the following. • The project will require no work below the OHWM within waters of May Creek, which may represent migratory and foraging habitat for adult salmon and adult and juvenile steelhead and bull trout. Critical Habitat is not present for these species. • Salmonid use of the action area may be limited to moderate-quality foraging and migration habitat. Under normal, non-project conditions, migrating adult and juvenile salmonids likely move through the action area rapidly. • The project has the potential to result in temporarily impaired water quality within the action area. − The impact minimization and BMPs (described in Section 2.3) will be sufficient to reduce the potential for adverse effects to an insignificant level. • The levels of terrestrial noise that will be generated will be de minimis, and are not expected to be elevated significantly above the ambient noise levels at the site. 7.4.2 Critical Habitats Designated Salmon and Steelhead Critical Habitat Critical habitat has been designated for Puget Sound ESU Chinook salmon, Puget Sound DPS steelhead, and Coastal Puget Sound bull trout has been designated but no critical habitat occurs within the action area. The effects determination is that the proposed project has “no effect” to these critical habitats. This determination is warranted based on the following rationale. • Critical habitat is not present in the action area. • The proposed action requires no work below the OHWM within waters of May Creek, in which no critical habitat is present. • The proposed action will not result in any benthic impacts. DRAFT Biological Assessment WSP USA, 30902211.000 City of Renton, May Creek Trail South Soft Surface Trail and Bridge Project September 2024 Renton, Washington Page 8 of 29 8.0 REFERENCES Behnke, R.J. 1992. Native trout of western North America. American Fisheries Society Monograph 6. Bethesda, Maryland. Federal Transit Administration (FTA). 2006. Transit Noise and Vibration Impact Assessment Guidance FTA-VA-90-1003-06. May 2006. Greater Lake Washington Technical Committee. 2001. Draft Reconnaissance Assessment – Habitat Factors that Contribute to the Decline of Salmonids: Lake Washington Subarea Chapter. Kerwin, J. 2001. Salmon and Steelhead Habitat Limiting Factors Report for the Cedar – Sammamish Basin (Water Resource Inventory Area 8). Washington Conservation Commission, Olympia. King County. 2023. King County Water Quality Monitoring. https://green2.kingcounty.gov/streamsdata/watershedinfo.aspx?Locator=0440. Accessed February 20, 2023. King County. 2001. Final Adopted May Creek Basin Action Plan, April 2001. https://your.kingcounty.gov/dnrp/library/2001/kcr726.pdf. Accessed February 20, 2023. Lower Columbia Fish Recovery Board (LCFRB). 2004. Lower Columbia Salmon Recovery and Fish and Wildlife Subbasin Plan, Volume I—Regional Plan. Myers, J.M., R.G. Kope, G.J. Bryant, D. Teel, L.J. Lierheimer, T.C. Wainwright, W.S. Grant, F.W. Waknitz, K. Neely, S.T. Lindley, and R.S. Waples. 1998. Status Review of Chinook Salmon from Washington, Idaho, Oregon, and California. U.S. Department of Commerce, NOAA Tech. Memo. NMFS- NWFSC-35, 443pp. National Oceanic and Atmospheric Administration (NOAA). 2016. Steelhead Trout (Onchorynchus mykiss) http://www.fisheries.noaa.gov/pr/species/fish/steelhead-trout.html. Accessed June 20, 2017. National Oceanic and Atmospheric Administration Fisheries Service (NOAA NMFS). 2023. ESA Threatened & Endangered Listings, available at https://www.fisheries.noaa.gov/species-directory/threatened-endangered. Accessed February 15, 2023. National Oceanic and Atmospheric Administration Fisheries Service (NOAA NMFS). 2023a. National NMFS ESA Critical Habitat Mapper, available at https://noaa.maps.arcgis.com/apps/webappviewer/index.html?id=68d8df16b39c 48fe9f60640692d0e318. Accessed February 15, 2023. DRAFT Biological Assessment WSP USA, 30902211.000 City of Renton, May Creek Trail South Soft Surface Trail and Bridge Project September 2024 Renton, Washington Page 8 of 29 National Oceanic and Atmospheric Administration Fisheries Service (NOAA NMFS). 2011. 5-Year Review: Summary & Evaluation of Puget Sound Chinook, Hood Canal Summer Chum, Puget Sound Steelhead. National Oceanic and Atmospheric Administration Fisheries Service (NOAA NMFS). 1996. Making Endangered Species Act Determinations of Effect for Individual or Grouped Actions at the Watershed Scale. Rieman, B.E. and J.D. McIntyre. 1993. Demographic and habitat requirements for the conservation of bull trout Salvelinus confluentus. USDA Forest Service Intermountain Research Station, General Technical Report INT-302, Ogden, UT. Smith, Carol J. 2003. Salmon and Steelhead Habitat Limiting Factors Water Resource Inventory Areas 3 and 4, the Skagit and Samish Basins. Washington State Conservation Commission. Lacey, WA. U.S. Fish and Wildlife Service (USFWS). 2023. Information for Planning and Consultation. http://ecos.fws.gov/ipac/. Accessed February 17, 2023. Washington State Department of Fish and Wildlife (WDFW). 2023. Priority Habitats and Species List—PHS on the Web. http://wdfw.wa.gov/mapping/phs/. Accessed February 15, 2023. Washington State Department of Fish and Wildlife (WDFW). 2023a. WDFW SalmonScape database, available at https://apps.wdfw.wa.gov/salmonscape/map.html. Accessed April 14, 2019. Washington Department of Fish and Wildlife (WDFW). 2023b. WDFW Threatened and endangered species listing, available at https://wdfw.wa.gov/species- habitats/at-risk/listed. Accessed February 15, 2023. Washington State Department of Transportation (WSDOT). 2018. Biological Assessment Preparation – Advanced Training Manual Version 02-2018. February 2018. Washington State Department of Transportation (WSDOT). 2016. Annual Traffic Report. https://digitalarchives.wa.gov/do/6F5FB22E627538839E4DBAC41BDD F87C.pdf. Accessed February 20, 2023. DRAFT Biological Assessment WSP USA, 30902211.000 City of Renton, May Creek Trail South Soft Surface Trail and Bridge Project September 2024 Renton, Washington Page 8 of 29 9.0 LIST OF ACRONYMS AND ABBREVIATIONS ADA The Americans with Disabilities Act BA biological assessment BMP best management practice C Celsius CFR Code of Federal Regulations County King County DPS distinct population segment Ecology Washington State Department of Ecology ESA Endangered Species Act ESU evolutionarily significant unit FR Federal Register FRP fiber-reinforced plastic ft foot FTA Federal Transit Administration LTAA likely to adversely affect LWD large woody debris MLLW mean lower low water NE no effect NLTAA not likely to adversely affect NOAA National Oceanic and Atmospheric Administration NMFS National Marine Fisheries Service NPF not properly functioning OHWM ordinary high water mark PCE primary constituent element PF properly functioning PHS Priority Habitat and Species SPCC spill prevention, control, and countermeasures USACE U.S. Army Corps of Engineers USFWS U.S. Fish and Wildlife Service WAC Washington Administrative Code WDFW Washington Department of Fish and Wildlife WOTUS waters of the United States WSDOT Washington State Department of Transportation APPENDIX A SELECTED 60% DESIGN PLANS MAY CREEK TRAIL SOUTH South side of May Creek within the May Creek Greenway RENTON, WASHINGTON TACOMA SEATTLE EVERETT BELLINGHAM CANADA OREGON OLYMPIA PACIFIC OCEAN RENTON AREA MAP SCALE: NTS PROJECT LOCATION MAYOR: ARMONDO PAVONE PROJECT LOCATION VICINITY MAP SCALE: NTS LAK E W A S H I N G T O N B L V D N 405 HO U S E R WA Y N N 41ST P L WI L L I A M S A V E N WEL L S A V E N PAR K A V E N N 4 0 T H P L S O U T H P O R T D R . N NE S U N S E T BLV D RENTON CITY COUNCIL: RYAN McIRVIN ED PRINCE JAMES ALBERSON JR. VALERIE O'HALLORAN RUTH PÉREZ CARMEN RIVERA KIM-KHÁNH VĂN PARKS AND RECREATION DEPARTMENT: KELLY BEYMER, PARKS AND RECREATION ADMINISTRATOR ERICA SCHMITZ , PARKS PLANNING AND NATURAL RESOURCES DIRECTOR JASON LEDERER, PARKS PLANNING MANAGER EAS T R A I L MAY CREEK TRAIL NORTH M A Y C R E E K N 40TH ST APPROXIMATE SHORELINE RENTON CITY OF La s t S a v e d b y : US B H 6 7 5 5 8 1 o n : Ap r 1 9 , 2 0 2 4 8 : 4 9 A M F i l e : C: \ U s e r s \ U S B H 6 7 5 5 8 1 \ W S P O 3 6 5 \ N W M a r i t i m e P r o j e c t s - P r o j e c t s \ 3 0 9 0 2 2 1 1 \ 0 0 0 \ C A D D \ D w g s \ 0 1 _ G 0 1 . d w g Co p y r i g h t © W S P U S A I n c . A l l R i g h t s R e s e r v e d . WSP USA Inc. Suite 300 Federal Way, WA 98003-2600 TEL: (206) 431-2300 FAX: (206) 431-2250 33301 9th Avenue South XX X X - X X X X X XX X X - X X X X X X CX X X X X X X XX X - X X - X X X X LAKE WASHINGTON COVER SHEET MAY CREEK TRAIL 60 % S U B M I T T A L - N O T F O R C O N S T R U C T I O N SOUTH TRAIL DESIGN PP P - S S - T T T T X X-X X X-X X X-X SCALE: LEGEND: WATER SURFACE ELEVATION OR SECTION CUT PLAN, SECTION, DETAIL, OR ELEVATION CALLOUT DRAWING WHERE SECTION, DETAIL, OR ELEVATION IS CALLED FROM PLAN, SECTION, DETAIL, OR ELEVATION XX.XX -YY.YY PILE CUTOFF ELEVATION MIN PILE TIP ELEVATION DRAWING INDEX: WP# NORTH ARROW WORK POINT HORIZONTAL DATUM WASHINGTON STATE PLANE COORDINATE SYSTEM, NORTH ZONE, NAD 83/1991 BASED ON CITY OF RENTON PUBLISHED HORIZONTAL CONTROL FOR THE LOCATED MONUMENTS LISTED BELOW CITY OF RENTON HORIZONTAL CONTROL#1886 N.W. SECTION CORNER, SECTION 5; MONUMENT LOCATED NEAR THE INTERSECTION OF BURNETT & N 28TH PUBLISHED VALUES N:58361.0302 (METERS)N:191472.81 (USFT) E:396532.414 (METERS)E: 1300956.76 (USFT) CITY OF RENTON HORIZONTAL CONTROL#1839 MONUMENT AT THE INTERSECTION OF JONES & 20TH PUBLISHED VALUES N:57570.0496 (METERS)N: 188877.74 (USFT) E:397327.4787 (METERS)E: 1300956.76 (USFT) VERTICAL DATUM NAVD 88 CITY OF RENTON BENCH MARK #1886 ELEVATION=104.72 CITY OF RENTON BENCH MARK #1839 ELEVATION=279.165 ABBREVIATIONS ACI AMERICAN CONCRETE INSTITUTE ACP ASPHALT CONCRETE PAVEMENT AISC AMERICAN INSTITUTE OF STEEL CONSTRUCTION AITC AMERICAN INSTITUTE OF TIMBER CONSTRUCTION API AMERICAN PETROLEUM INSTITUTE APPROX APPROXIMATE AWPA AMERICAN WOOD PROTECTION ASSOCIATION ASTM AMERICAN SOCIETY FOR TESTING AND MATERIALS AWS AMERICAN WELDING SOCIETY BMP BEST MANAGEMENT PRACTICE BOT BOTTOM CCTV CLOSED CIRCUIT TELEVISION CIP CAST-IN-PLACE CJ CONSTRUCTION JOINT CENTER LINE CLR CLEAR CONC CONCRETE CONN CONNECTION CONT CONTINUOUS CONT'D CONTINUED CRSI CONCRETE REINFORCING STEEL INSTITUTE CU CUBIC CY CUBIC YARD DBL DOUBLE DEMO DEMOLITION, DEMOLISH DIP DUCTILE IRON PIPE DIA, Ø DIAMETER DWG DRAWING EA EACH EL, ELEV ELEVATION EQ EQUAL ESC EROSION SEDIMENT CONTROL ETC ETCETERA EXIST EXISTING EXT EXTERIOR FAB FABRICATE FB FLAT BAR FT FEET FRP FIBER REINFORCED POLYMER FL FLAT GAL GALLONS GALV GALVANIZED GPM GALLONS PER MINUTE GR GRADE HORIZ HORIZONTAL HS HIGH STRENGTH HSS HOLLOW STRUCTURAL SECTION IBC INTERNATIONAL BUILDING CODE IN INCH INT INTERIOR KIP 1,000 POUNDS KSI KIPS PER SQUARE INCH L ANGLE (E.G. L4X4X1/4) LB(S)POUND(S) LF LINEAL FEET LLV LONG LEG VERTICAL LONG LONGITUDINAL LRFD LOAD AND RESISTANCE FACTOR DESIGN MAX MAXIMUM MB MACHINE BOLT MDD MAXIMUM DRY DENSITY MID MIDDLE MIN MINIMUM MJ MECHANICAL JOINT ML MUDLINE NO NUMBER NOM NOMINAL NTS NOT TO SCALE OC ON CENTER OHW ORDINARY HIGH WATER OHWM ORDINARY HIGH WATER MARK OPP OPPOSITE ABBREVIATIONS CONT. PED PEDESTRIAN PL PLATE PSF POUNDS PER SQUARE FOOT PREP PREPARATION PSI POUNDS PER SQUARE INCH QTY QUANTITY PVC POLYVINYL CHLORIDE PVMT PAVEMENT R RADIUS REQ,REQ'D REQUIRED REINF REINFORCEMENT SCH SCHEDULE SECT SECTION SIM SIMILAR SP,SPA SPACE(S) SPEC SPECIFICATIONS SS STAINLESS STEEL SQ SQUARE STD STANDARD SYM SYMMETRICAL T&B TOP & BOTTOM TESC TEMPORARY EROSION SEDIMENT CONTROL TYP TYPICAL UNO UNLESS NOTED OTHERWISE W/WITH W/O WITH OUT WCLIB WEST COAST LUMBER INSPECTION BUREAU WL WATER LINE WSDOT WASHINGTON STATE DEPARTMENT OF TRANSPORTATION WT WEIGHT WWPI WESTERN WOOD PRESERVERS INSTITUTE VERT VERTICAL XS EXTRA STRONG (E.G., PIPE4X-STRONG) RENTON CITY OF La s t S a v e d b y : US B H 6 7 5 5 8 1 o n : Ap r 1 9 , 2 0 2 4 9 : 3 6 A M F i l e : C: \ U s e r s \ U S B H 6 7 5 5 8 1 \ W S P O 3 6 5 \ N W M a r i t i m e P r o j e c t s - P r o j e c t s \ 3 0 9 0 2 2 1 1 \ 0 0 0 \ C A D D \ D w g s \ 0 1 _ G 0 2 . d w g Co p y r i g h t © W S P U S A I n c . A l l R i g h t s R e s e r v e d . WSP USA Inc. Suite 300 Federal Way, WA 98003-2600 TEL: (206) 431-2300 FAX: (206) 431-2250 33301 9th Avenue South XX X X - X X X X X XX X X - X X X X X X CX X X X X X X XX X - X X - X X X X DRAWING INDEX, ABBREVIATIONS & GENERAL NOTES MAY CREEK TRAIL 60 % S U B M I T T A L - N O T F O R C O N S T R U C T I O N SOUTH TRAIL DESIGN PP P - S S - T T T T LA K E W A S H I N G T O N B L V D . ( W E L L S A V E . ) N. 4 1 S T S T . 3224059109 CITY OF RENTON 3224059081 CITY OF RENTON 3224059109 CITY OF RENTON S R 4 0 5 ( W S D O T ) KI N G C O U N T Y P A R K S (F O R M E R B N S F R R ) LA K E W A S H I N G T O N B L V D . S R 4 0 5 ( W S D O T ) KI N G C O U N T Y P A R K S (F O R M E R B N S F R R ) RENTON CITY OF La s t S a v e d b y : Li J 1 o n : Ap r 1 9 , 2 0 2 4 2 : 1 4 P M F i l e : C: \ U s e r s \ U S B H 6 7 5 5 8 1 \ W S P O 3 6 5 \ N W M a r i t i m e P r o j e c t s - P r o j e c t s \ 3 0 9 0 2 2 1 1 \ 0 0 0 \ C A D D \ D w g s \ 0 2 _ C 0 1 . d w g Co p y r i g h t © W S P U S A I n c . A l l R i g h t s R e s e r v e d . WSP USA Inc. Suite 300 Federal Way, WA 98003-2600 TEL: (206) 431-2300 FAX: (206) 431-2250 33301 9th Avenue South XX X X - X X X X X XX X X - X X X X X X CX X X X X X X XX X - X X - X X X X EXISTING MAY CREEK TRAIL WETLAND B M A Y C R E E K FL O W NOTES CONSTRUCTION KEY NOTES 1.SEE DRAWINGS C-2 FOR TESC PLAN AND C-7 TREE RETENTION PLANS. 2.FLOODPLAIN LIMITS TAKEN FROM COR MAPS. 3.SURVEY DATA REPRODUCED FROM SITTS AND HILL SURVEY (DATED FEBRUARY 2024). 4.WETLAND DELINEATION TAKEN FROM MAY CREEK TRAIL SOUTH WETLAND AND STREAM DELINEATION REPORT (DATED APRIL 2024). PROTECT-IN-PLACE EXISTING CULVERT DURING INSTALLATION OF CONSTRUCTION ENTRANCE, SEE DETAIL 1 ON DWG C-5. DEMOLISH 75 FEET OF EXISTING TRAIL. REMOVE WOODCHIP MULCH AND BASE COURSE MATERIAL DOWN TO SUBGRADE. 1 WETLAND A WETLAND C WETLAND D 1 FL O 0 D W A Y FL O 0 D W A Y 10 0 Y E A R F L O 0 D P L A I N 1 0 0 Y E A R F L O 0 D P L A I N 5 0 0 Y E A R F L O 0 D P L A I N 2 2 EXISTING MAY CREEK TRAIL APPROXIMATE CLEARING LIMITS, TYP EXISTING TRAIL EXISTING CONCRETE EXISTING LIGHT POLE EXISTING UTILITY POLE EXISTING FENCE ORDINARY HIGH WATER LINE EXISTING WETLAND APPROXIMATE CLEARING LIMITS DEMO AREA FLOODPLAIN LIMITS OHWM LEGEND PLAN - EXISTING CONDITIONS SCALE: 1" = 40' feet 8040400 scale EXISTING CONDITIONS & SITE PREP MAY CREEK TRAIL 60 % S U B M I T T A L - N O T F O R C O N S T R U C T I O N SOUTH TRAIL DESIGN PP P - S S - T T T T RENTON CITY OF La s t S a v e d b y : Li J 1 o n : Ap r 1 9 , 2 0 2 4 2 : 1 3 P M F i l e : C: \ U s e r s \ U S B H 6 7 5 5 8 1 \ W S P O 3 6 5 \ N W M a r i t i m e P r o j e c t s - P r o j e c t s \ 3 0 9 0 2 2 1 1 \ 0 0 0 \ C A D D \ D w g s \ 0 2 _ C 0 2 . d w g Co p y r i g h t © W S P U S A I n c . A l l R i g h t s R e s e r v e d . WSP USA Inc. Suite 300 Federal Way, WA 98003-2600 TEL: (206) 431-2300 FAX: (206) 431-2250 33301 9th Avenue South XX X X - X X X X X XX X X - X X X X X X CX X X X X X X XX X - X X - X X X X 1.SEE L SERIES SHEETS FOR LANDSCAPE RESTORATION PLANS. 2.SEE DRAWING C-7 FOR TREE RETENTION AND CLEARING PLAN. 3.FENCE LIMITS SHOWN ARE SCHEMATIC. CONTRACTOR TO DETERMINE QUANTITY AND EXTENTS REQUIRED TO MEET THE REQUIREMENTS SPECIFIED ON DWG C-6 AND FINAL CLEARING AND GRADING PERMIT (CSWPPP). 4.CONTRACTOR SHALL INSTALL STRAW WATTLES ALONG DOWNSLOPE EDGE OF DISTURBANCE AREAS. 5.CONTRACTOR SHALL INSTALL HIGH VISIBILITY FENCE AROUND PROPOSED CLEARING LIMITS. HIGH VISIBILITY FENCE SHALL BE USED TO DEFINE PROJECT AREA LIMITS AND TO ESTABLISH BOUNDARY BETWEEN CLEARING LIMITS AND AREAS TO BE LEFT UNDISTURBED (EXISTING TRAIL, WETLANDS, STREAM BANK, ETC.), UNLESS OTHERWISE SHOWN. 6.FLOODPLAIN LIMITS TAKEN FROM COR MAPS. 7.SURVEY DATA REPRODUCED FROM SITTS AND HILL SURVEY (DATED FEBRUARY 2024). 8.WETLAND DELINEATION TAKEN FROM MAY CREEK TRAIL SOUTH WETLAND AND STREAM DELINEATION REPORT (DATED APRIL 2024). EXISTING CONCRETE EXISTING LIGHT POLE EXISTING UTILITY POLE EXISTING FENCE ORDINARY HIGH WATER LINE EXISTING WETLAND STRAW WATTLE, SEE DETAIL 1 ON DWG C-4 HIGH VISIBILITY FENCE, SEE NOTE 3 THIS SHEET AND DETAIL 2 ON DWG C-5 GRADING LIMITS CONSTRUCTION LIMITS STABILIZED CONSTRUCTION ENTRANCE, SEE DETAIL 1 ON DWG C-5 & TESC NOTE 6 ON DWG C-6 CONSTRUCTION LAYDOWN AREA OHWM LEGEND EXISTING MAY CREEK TRAIL GRADING LIMITS, TYP 1 0 0 Y E A R F L O 0 D P L A I N 10 0 Y E A R F L O 0 D P L A I N F L O O D W A Y 5 0 0 Y E A R F L O 0 D P L A I N F L O O D W A Y WETLAND C WETLAND A WETLAND B WETLAND D EXISTING MAY CREEK TRAIL CONTRUCTION LAYDOWN AREA, TYP STABILIZED CONSTRUCTION ENTRANCE PLAN - TESC SCALE: 1" = 40' feet 8040400 scale NOTES: TESC PLAN MAY CREEK TRAIL 60 % S U B M I T T A L - N O T F O R C O N S T R U C T I O N SOUTH TRAIL DESIGN PP P - S S - T T T T RENTON CITY OF La s t S a v e d b y : Li J 1 o n : Ap r 1 8 , 2 0 2 4 1 1 : 3 4 P M F i l e : C: \ U s e r s \ U S B H 6 7 5 5 8 1 \ W S P O 3 6 5 \ N W M a r i t i m e P r o j e c t s - P r o j e c t s \ 3 0 9 0 2 2 1 1 \ 0 0 0 \ C A D D \ D w g s \ 0 2 _ C 0 6 . d w g Co p y r i g h t © W S P U S A I n c . A l l R i g h t s R e s e r v e d . WSP USA Inc. Suite 300 Federal Way, WA 98003-2600 TEL: (206) 431-2300 FAX: (206) 431-2250 33301 9th Avenue South XX X X - X X X X X XX X X - X X X X X X CX X X X X X X XX X - X X - X X X X TESC NOTES: 1.BEFORE ANY CONSTRUCTION OR DEVELOPMENT ACTIVITY OCCURS, A PRE-CONSTRUCTION MEETING SHALL BE HELD AMONG THE CITY OF RENTON, HEREBY REFERRED TO AS THE CITY, THE APPLICANT, AND THE APPLICANT'S CONTRACTOR. 2.THE ESC PLAN SHEET INCLUDES AN ESC CONSTRUCTION SEQUENCE DETAILING THE ORDERED STEPS THAT SHALL BE FOLLOWED FROM CONSTRUCTION COMMENCEMENT TO POST-PROJECT CLEANUP IN ORDER TO FULFILL PROJECT ESC REQUIREMENTS. 3.THE ESC FACILITIES SHOWN ON THIS PLAN MUST BE CONSTRUCTED PRIOR TO OR IN CONJUNCTION WITH ALL CLEARING AND GRADING SO AS TO ENSURE THAT THE TRANSPORT OF SEDIMENT TO SURFACE WATERS, DRAINAGE SYSTEMS, AND ADJACENT PROPERTIES IS MINIMIZED. 4.THE BOUNDARIES OF THE CLEARING LIMITS, SENSITIVE AREAS AND THEIR BUFFERS, AND AREAS OF VEGETATION PRESERVATION AND TREE RETENTION AS PRESCRIBED ON THE PLAN(S) SHALL BE CLEARLY DELINEATED BY FENCING AND PROTECTED IN THE FIELD IN ACCORDANCE WITH APPENDIX D OF THE CITY OF RENTON SURFACE WATER DESIGN MANUAL (RENTON SWDM) PRIOR TO THE START OF CONSTRUCTION. DURING THE CONSTRUCTION PERIOD, NO DISTURBANCE BEYOND THE CLEARING LIMITS SHALL BE PERMITTED. THE CLEARING LIMITS SHALL BE MAINTAINED BY THE APPLICANT/ESC SUPERVISOR FOR THE DURATION OF CONSTRUCTION. 5.STABILIZED CONSTRUCTION ENTRANCES SHALL BE INSTALLED AT THE BEGINNING OF CONSTRUCTION AND MAINTAINED FOR THE DURATION OF THE PROJECT. ADDITIONAL MEASURES, SUCH AS CONSTRUCTED WHEEL WASH SYSTEMS OR WASH PADS, MAY BE REQUIRED TO ENSURE THAT ALL PAVED AREAS ARE KEPT CLEAN AND TRACK-OUT TO ROAD RIGHT OF WAY DOES NOT OCCUR FOR THE DURATION OF THE PROJECT. IF SEDIMENT IS TRACKED OFFSITE, PUBLIC ROADS SHALL BE CLEANED THOROUGHLY AT THE END OF EACH DAY, OR MORE FREQUENTLY DURING WET WEATHER, AS NECESSARY TO PREVENT SEDIMENT FROM ENTERING WATERS OF THE STATE. 6.WASHOUT FROM CONCRETE TRUCKS SHALL BE PERFORMED OFF-SITE OR IN DESIGNATED CONCRETE WASHOUT AREAS ONLY. DO NOT WASH OUT CONCRETE TRUCKS ONTO THE GROUND, OR TO STORM DRAINS OR OPEN DITCHES. ON-SITE DUMPING OF EXCESS CONCRETE SHALL ONLY OCCUR IN DESIGNATED CONCRETE WASHOUT AREAS. 7.ALL REQUIRED ESC BMPS SHALL BE CONSTRUCTED AND IN OPERATION PRIOR TO LAND CLEARING AND/OR CONSTRUCTION TO PREVENT TRANSPORTATION OF SEDIMENT TO SURFACE WATER, DRAINAGE SYSTEMS AND ADJACENT PROPERTIES. ALL ESC BMPS SHALL BE MAINTAINED IN A SATISFACTORY CONDITION UNTIL SUCH TIME THAT CLEARING AND/OR CONSTRUCTION IS COMPLETE AND POTENTIAL FOR ON-SITE EROSION HAS PASSED. ALL ESC BMPS SHALL BE REMOVED AFTER CONSTRUCTION IS COMPLETED AND THE SITE HAS BEEN STABILIZED TO ENSURE POTENTIAL FOR ON-SITE EROSION DOES NOT EXIST. THE IMPLEMENTATION, MAINTENANCE, REPLACEMENT, ENHANCEMENT, AND REMOVAL OF ESC BMPS SHALL BE THE RESPONSIBILITY OF THE APPLICANT. 8.ANY HAZARDOUS MATERIALS OR LIQUID PRODUCTS THAT HAVE THE POTENTIAL TO POLLUTE RUNOFF SHALL BE DISPOSED OF PROPERLY. 9.THE ESC BMPS DEPICTED ON THIS DRAWING ARE INTENDED TO BE MINIMUM REQUIREMENTS TO MEET ANTICIPATED SITE CONDITIONS. AS CONSTRUCTION PROGRESSES AND UNEXPECTED OR SEASONAL CONDITIONS DICTATE, THE APPLICANT SHALL ANTICIPATE THAT MORE ESC BMPS WILL BE NECESSARY TO ENSURE COMPLETE SILTATION CONTROL ON THE PROPOSED SITE. DURING THE COURSE OF CONSTRUCTION, IT SHALL BE THE OBLIGATION AND RESPONSIBILITY OF THE APPLICANT TO ADDRESS ANY NEW CONDITIONS THAT MAY BE CREATED BY THE ACTIVITIES AND TO PROV IDE ADDITIONAL ESC BMPS, OVER AND ABOVE MINIMUM REQUIREMENTS, AS MAY BE NEEDED, TO PROTECT ADJACENT PROPERTIES AND WATER QUALITY OF THE RECEIVING DRAINAGE SYSTEM. 10.ANY DEWATERING SYSTEM NECESSARY FOR THE CONSTRUCTION OF STORMWATER FACILITIES SHALL BE SUBMITTED TO THE CITY FOR REVIEW AND APPROVAL. 11.ANY AREAS OF EXPOSED SOILS, INCLUDING ROADWAY EMBANKMENTS, THAT WILL NOT BE DISTURBED FOR TWO DAYS DURING THE WET SEASON (OCTOBER 1ST THROUGH APRIL 30TH) OR SEVEN DAYS DURING THE DRY SEASON (MAY 1ST THROUGH SEPTEMBER 30TH) SHALL BE IMMEDIATELY STABILIZED WITH THE APPROVED ESC COVER METHODS (E.G., SEEDING, MULCHING, PLASTIC COVERING, ETC.) IN CONFORMANCE WITH APPENDIX D OF THE RENTON SWDM. 12.WET SEASON ESC REQUIREMENTS APPLY TO ALL CONSTRUCTION SITES BETWEEN OCTOBER 1ST AND APRIL 30TH, UNLESS OTHERWISE APPROVED BY THE CITY. 13.ANY AREA NEEDING ADDITIONAL ESC MEASURES, NOT REQUIRING IMMEDIATE ATTENTION, SHALL BE ADDRESSED WITHIN SEVEN (7) DAYS. 14.THE ESC BMPS ON INACTIVE SITES SHALL BE INSPECTED AND MAINTAINED AT A MINIMUM OF ONCE A MONTH OR WITHIN 24 HOURS FOLLOWING A STORM EVENT. INSPECTION AND MAINTENANCE SHALL OCCUR MORE FREQUENTLY AS REQUIRED BY THE CITY. 15.BEFORE COMMENCEMENT OF ANY CONSTRUCTION ACTIVITY, CATCH BASIN INSERTS PER THE CITY STANDARD PLAN 216.30 SHALL BE PROVIDED FOR ALL STORM DRAIN INLETS DOWNSLOPE AND WITHIN 500 FEET OF A DISTURBED OR CONSTRUCTION AREA, UNLESS THE RUNOFF THAT ENTERS THE INLET WILL BE CONVEYED TO A SEDIMENT POND OR TRAP. ALL CATCH BASIN INSERTS SHALL BE PERIODICALLY INSPECTED AND REPLACED AS NECESSARY TO ENSURE FULLY FUNCTIONING CONDITION. 16.AT NO TIME SHALL SEDIMENT ACCUMULATION EXCEED 2/3 OF THE CAPACITY OF THE CATCH BASIN SUMP. ALL CATCH BASINS AND CONVEYANCE LINES SHALL BE CLEANED PRIOR TO PAVING. THE CLEANING OPERATION SHALL NOT FLUSH SEDIMENT-LADEN WATER INTO THE DOWNSTREAM SYSTEM. 17.PRIOR TO THE BEGINNING OF THE WET SEASON (OCTOBER 1ST), ALL DISTURBED AREAS SHALL BE INSPECTED TO IDENTIFY WHICH ONES SHALL BE SODDED OR SEEDED IN PREPARATION FOR THE WINTER RAINS. DISTURBED AREAS SHALL BE SODDED OR SEEDED WITHIN ONE WEEK OF THE BEGINNING OF THE WET SEASON. AN EXHIBIT OF THOSE AREAS TO BE SODDED OR SEEDED AND THOSE AREAS TO REMAIN UNCOVERED SHALL BE SUBMITTED TO THE CITY FOR REVIEW. 18.PRIOR TO FINAL CONSTRUCTION ACCEPTANCE, THE PROJECT SITE SHALL BE STABILIZED TO PREVENT SEDIMENT-LADEN WATER FROM LEAVING THE PROJECT SITE. ALL ESC BMPS SHALL BE REMOVED, AND STORMWATER CONVEYANCE SYSTEMS, FACILITIES, AND ON-SITE BMPS SHALL BE RESTORED TO THEIR FULLY FUNCTIONING CONDITION. ALL DISTURBED AREAS OF THE PROJECT SITE SHALL BE VEGETATED OR OTHERWISE PERMANENTLY STABILIZED. AT A MINIMUM, DISTURBED AREAS SHALL BE SODDED OR SEEDED AND MULCHED TO ENSURE SUFFICIENT COVER WILL DEVELOP SHORTLY AFTER FINAL APPROVAL. MULCH WITHOUT SEEDING IS ADEQUATE FOR AREAS TO BE LANDSCAPED BEFORE OCTOBER 1ST. 19.ROCKERIES ARE CONSIDERED TO BE A METHOD OF BANK STABILIZATION AND EROSION CONTROL. ROCKERIES SHALL NOT BE CONSTRUCTED TO SERVE AS RETAINING WALLS. ALL ROCKERIES IN CITY ROAD RIGHTS-OF-WAY SHALL BE CONSTRUCTED IN ACCORDANCE WITH CITY STANDARDS. ROCKERIES OUTSIDE OF ROAD RIGHTS-OF-WAY SHALL BE CONSTRUCTED IN ACCORDANCE WITH THE INTERNATIONAL BUILDING CODE. CONSTRUCTION SEQUENCING 1.HOLD PRE-CONSTRUCTION MEETING. 2.POST SIGN WITH NAME AND PHONE NUMBER OF CSWPP/ESC SUPERVISOR. 3.INSTALL HIGH VISIBILITY FENCE AROUND CLEARING LIMITS. 4.INSTALL CATCH BASIN PROTECTION AND STORMWATER BMP AREA PROTECTION IF REQUIRED. 5.INSTALL CONSTRUCTION ENTRANCE. 6.INSTALL PERIMETER PROTECTION (STRAW WATTLES, SILT FENCE, ETC.) 7.GRADE AND STABILIZE CONSTRUCTION ROADS. 8.MAINTAIN EROSION CONTROL MEASURES IN ACCORDANCE WITH APPENDIX D OF THE CITY OF RENTON SURFACE WATER DESIGN MANUAL. 9.RELOCATE EROSION CONTROL MEASURES OR INSTALL NEW MEASURES AS SITE CONDITIONS CHANGE. 10.COVER ALL AREAS THAT WILL BE UNWORKED FOR MORE THAN SEVEN DAYS DURING THE DRY SEASON OR TWO DAYS DURING THE WET SEASON WITH STRAW, WOOD FIBER MULCH, COMPOST OR EQUIVALENT. 11.STABILIZE ALL AREAS THAT REACH FINAL GRADE WITHIN SEVEN DAYS. 12.UPON COMPLETION OF THE PROJECT, ALL DISTURBED AREAS MUST BE STABILIZED AND BMPs REMOVED IF APPROPRIATE. SURFACE WATER STANDARD PLAN NOTES 1.BEFORE ANY CONSTRUCTION OR DEVELOPMENT ACTIVITY OCCURS, A PRE-CONSTRUCTION MEETING SHALL BE HELD AMONG THE CITY OF RENTON, HEREBY REFERRED TO AS THE CITY, THE APPLICANT, AND THE APPLICANT'S CONTRACTOR. 2.THE CONTRACTOR SHALL BE RESPONSIBLE FOR COMPLYING WITH ALL NECESSARY CITY, STATE, AND FEDERAL PERMITS PRIOR TO CONSTRUCTION. 3.ALL STORM DRAINAGE IMPROVEMENTS SHALL BE DESIGNED AND CONSTRUCTED IN ACCORDANCE WITH THE LATEST EDITION OF THE CITY OF RENTON SURFACE WATER DESIGN MANUAL (RENTON SWDM), RENTON MUNICIPAL CODE (RMC), AND THE STANDARD SPECIFICATIONS FOR ROAD, BRIDGE AND MUNICIPAL CONSTRUCTION PREPARED BY WSDOT AND THE AMERICAN PUBLIC WORKS ASSOCIATION (APWA). IT SHALL BE THE SOLE RESPONSIBILITY OF THE APPLICANT TO CORRECT ANY ERROR, OMISSION OR VARIATION FROM THE ABOVE REQUIREMENTS FOUND IN THE PLANS. ALL CORRECTIONS SHALL BE AT NO ADDITIONAL COST TO THE CITY. 4.APPROVAL OF THE ROAD, GRADING, PARKING, BUILDING, AND DRAINAGE PLAN DOES NOT CONSTITUTE AS APPROVAL OF ANY OTHER CONSTRUCTION (E.G. WATER, SEWER, GAS, ELECTRICAL. ETC.). PLANS FOR STRUCTURES SUCH AS BRIDGES, VAULTS, AND RETAINING WALLS REQUIRE A SEPARATE REVIEW AND APPROVAL BY THE CITY PRIOR TO CONSTRUCTION. THE SURFACE WATER DRAINAGE SYSTEM SHALL BE CONSTRUCTED ACCORDING TO THE APPROVED PLANS. ANY DEVIATION FROM THE APPROVED PLANS WILL REQUIRE COORDINATION FOLLOWED BY WRITTEN APPROVAL FROM THE CITY. 5.A COPY OF THE APPROVED PLANS SHALL BE ON THE JOB SITE WHENEVER CONSTRUCTION IS IN PROGRESS. 6.THE LOCATIONS OF ALL EXISTING UTILITIES SHOWN HEREON HAVE BEEN ESTABLISHED BY FIELD SURVEY OR OBTAINED FROM AVAILABLE RECORDS AND SHALL THEREFORE BE CONSIDERED APPROXIMATE ONLY AND NOT NECESSARILY COMPLETE. IT IS THE SOLE RESPONSIBILITY OF THE CONTRACTOR TO INDEPENDENTLY VERIFY THE ACCURACY OF ALL UTILITY LOCATIONS SHOWN, AND TO FURTHER DISCOVER AND AVOID ANY OTHER UTILITIES NOT SHOWN HEREON THAT MAY BE AFFECTED BY THE IMPLEMENTATION OF THIS PLAN. THE CONTRACTOR SHALL RECORD ON THE AS-BUILT DRAWINGS ALL UNDOCUMENTED UTILITIES DISCOVERED AND ANY CHANGES TO THE APPROVED PLANS. THE CONTRACTOR SHALL IMMEDIATELY NOTIFY THE ENGINEER OF RECORD IF A CONFLICT EXISTS. 7.VERTICAL DATUM SHALL BE NAVD 88 AND HORIZONTAL DATUM SHALL BE NAD 83 (WA STATE PLANE, NORTH), UNLESS OTHERWISE APPROVED BY THE CITY. REFERENCE BENCHMARK, DATUM, AND ELEVATIONS SHALL BE NOTED ON THE PLANS. 8.ALL UTILITY TRENCH BACKFILL AND ROADWAY SUBGRADE SHALL BE COMPACTED TO 95% MAXIMUM DRY DENSITY PER SECTION 2-03.3(14)D - COMPACTION AND MOISTURE CONTROL TESTS OF THE WSDOT STANDARD SPECIFICATIONS. IN PERMEABLE PAVEMENT AND OTHER INFILTRATION AREAS, ALL TRENCH BACKFILL SHALL BE FIRM AND UNYIELDING BUT IN NO CASE SHALL BE COMPACTED TO MORE THAN 92% OF MAXIMUM DRY DENSITY. 9.NOT USED 10.ALL PIPE AND STRUCTURES SHALL BE STAKED FOR SURVEY LINE AND GRADE PRIOR TO THE START OF CONSTRUCTION. WHERE SHOWN ON THE PLANS OR WHERE DIRECTED BY THE CITY, THE EXISTING MANHOLES, CATCH BASINS, OR INLETS SHALL BE ADJUSTED TO THE GRADE AS STAKED. 11.NOT USED 12.ALL PIPE AND APPURTENANCES SHALL BE LAID ON A PROPERLY PREPARED FOUNDATION IN ACCORDANCE WITH THE CURRENT STATE OF WASHINGTON STANDARD SPECIFICATION FOR ROAD AND BRIDGE CONSTRUCTION. THIS SHALL INCLUDE NECESSARY LEVELING OF THE TRENCH BOTTOM OR THE TOP OF THE FOUNDATION MATERIAL, AS WELL AS PLACEMENT AND COMPACTION OF REQUIRED BEDDING MATERIAL TO UNIFORM GRADE SO THAT THE ENTIRE LENGTH OF THE PIPE WILL BE SUPPORTED ON A UNIFORMLY DENSE, UNYIELDING BASE. ALL PIPE BEDDING AND BACKFILL SHALL BE AS SHOWN ON THE CITY STANDARD PLAN 220.00, 220.10, AND 220.20. 13.STEEL PIPE SHALL BE ALUMINIZED, OR GALVANIZED WITH ASPHALT TREATMENT 1, 2, OR 5 INSIDE AND OUTSIDE. 14.ALL DRAINAGE STRUCTURES SUCH AS CATCH BASINS AND MANHOLES SHALL BE FITTED WITH DUCTILE IRON, BOLT-LOCKING LIDS PER THE CITY STANDARD PLAN 204.10, 204.20, 204.30, 204.40, AND 204.50. STRUCTURES SHALL HAVE: ·RECTANGULAR OR ROUND, SOLID LIDS WHEN NOT COLLECTING RUNOFF, AND OUTSIDE OF THE ROADWAY. ·ROUND, SOLID LIDS WHEN NOT COLLECTING RUNOFF, AND LOCATED WITHIN THE ROADWAY, BUT OUTSIDE OF THE CURB/GUTTER LINE. ·ROUND, SOLID LIDS DISPLAYING THE CITY LOGO WHEN WITHIN THE PUBLIC RIGHT-OF-WAY OR IN AN EASEMENT TO THE CITY. PRIVATE STRUCTURE LIDS OUTSIDE PUBLIC RIGHT-OF-WAY AND EASEMENTS TO THE CITY SHALL NOT DISPLAY THE CITY LOGO. 15.NOT USED 16.NOT USED 17.NOT USED 18.ROCK FOR EROSION PROTECTION OF ROADSIDE DITCHES, WHERE REQUIRED, SHALL BE OF SOUND QUARRY ROCK PLACED TO A MINIMUM DEPTH OF ONE (1) FOOT AND SHALL MEET THE FOLLOWING SPECIFICATIONS: ·4 - 8 INCH ROCK / 40 - 70% PASSING; ·2 - 4 INCH ROCK / 30 - 40% PASSING; AND ·LESS THAN 2 INCH ROCK / 10 - 20% PASSING. 19.NOT USED 20.NOT USED 21.NOT USED 22.ALL NEWLY-INSTALLED AND NEWLY-REHABILITATED (PUBLIC AND PRIVATE) STORM CONVEYANCE SYSTEMS SHALL BE INSPECTED BY MEANS OF REMOTE CCTV ACCORDING TO THE CITY STANDARD PLAN 266.00. CCTV INSPECTIONS AND REPORTS SHALL BE SUBMITTED TO THE CITY PRIOR TO RECEIVING APPROVAL TO INSTALL PROJECT CURBS, GUTTERS AND/OR PAVEMENT. 23.NOT USED 24.FOR ALL DISTURBED PERVIOUS AREAS (COMPACTED, GRADED, LANDSCAPED, ETC.) OF THE DEVELOPMENT SITE, TO MAINTAIN THE MOISTURE CAPACITY OF THE SOIL EITHER STOCKPILE AND REDISTRIBUTE THE EXISTING DUFF LAYER AND NATIVE TOPSOIL OR AMEND THE SOIL WITH COMPOST IN ACCORDANCE WITH STANDARD PLAN 264.00. 25.NOT USED 26.ADEQUATE SAFEGUARDS, SAFETY DEVICES, PROTECTIVE EQUIPMENT, FLAGGERS, AND ANY OTHER ACTIONS NEEDED TO PROTECT THE LIFE, HEALTH, AND SAFETY OF THE PUBLIC, AND TO PROTECT PROPERTY IN CONNECTION WITH THE PERFORMANCE OF WORK SHALL BE PROVIDED. ANY WORK WITHIN THE TRAVELED RIGHT-OF-WAY THAT MAY INTERRUPT NORMAL TRAFFIC FLOW SHALL REQUIRE A TRAFFIC CONTROL PLAN APPROVED BY THE CITY. ALL SECTIONS OF THE WSDOT STANDARD SPECIFICATIONS 1-10 TEMPORARY TRAFFIC CONTROL SHALL APPLY. 27.NOT USED 28.NOT USED 29.NOT USED 30.MINIMUM COVER OVER STORM DRAINAGE PIPE SHALL CONFORM TO TABLE 4.2.1.A2 OF THE RENTON SWDM. 31.NOT USED TESC NOTES MAY CREEK TRAIL 60 % S U B M I T T A L - N O T F O R C O N S T R U C T I O N SOUTH TRAIL DESIGN PP P - S S - T T T T LA K E W A S H I N G T O N B L V D . 3224059109 CITY OF RENTON 3224059081 CITY OF RENTON 3224059109 CITY OF RENTON LA K E W A S H I N G T O N B L V D . KI N G C O U N T Y P A R K S (F O R M E R B N S F R R ) PRC 20+32.31 PRC 20+71.25 PRC 30+63.97 20+90 20+00 30+75 30+00 0+ 0 0 1+00 2+00 3 + 0 0 4 + 0 0 5+ 0 0 6+00 7+00 8+00 8+45 PC 0 + 7 8 . 7 5 P T 1 + 4 0 . 2 4 P C 1 + 8 4 . 9 4 PRC 2+66.29 PT 3 + 0 9 . 6 8 PI 3 + 3 3 . 0 2 PC 4 + 2 2 . 2 1 PCC 4 + 2 5 . 9 0 PR C 4 + 5 6 . 9 6 PT 4+94.28 PI 5 + 0 3 . 5 2 PI 5 + 3 9 . 8 3 PI 5+8 2 . 3 4 PI 6+26.33 PC 6 + 4 2 . 8 8 PT 6 + 5 9 . 2 1 PC 7 + 0 7 . 9 7 P T 7 + 1 8 . 2 0 PI 8+28.36 S57° 30' 48.06"E 78.748 N74° 43' 12.57"E 44.694 N81° 42' 16.44"E 48.763 S30° 56' 39.53"E 42.501 S73° 42' 36.01"E 43.992 S50° 43' 40.60"E 16.549 S42° 20' 41.68"E 23.340 S36° 56' 14.63"E 89.184 N50° 55' 40.87"E 110.161 N50° 55' 40.87"E 16.384 S53° 23' 05.25"E 9.235 S50° 16' 00.27"E 36.320 R=111.963 L=61.495 Δ=031.4694 R=44.831 L=81.357 Δ=103.9770 R=55.716 L=43.390 Δ=044.6200 R=42.751 L=31.064 Δ=041.6319 R=81.029 L=37.319 Δ=026.3888 R=23.670 L=16.329 Δ=039.5262 R=20.483 L=10.229 Δ=028.6128 R=34.548 L=3.689 Δ=006.1177 0+0 0 1 + 0 0 1 + 1 8 BP 0+00.00 EP 1 + 1 8 . 1 0 PI 0+59.06 PI 0+68.30 PC 0 + 0 1 . 3 5 PC 0 + 7 7 . 7 7 PC 0+95.73 PT 0+ 1 0 . 6 5 PT 0+84.44 PT 1 + 0 0 . 2 3 S63° 03' 26.92"E 1.350 S31° 43' 11.51"E 48.417 S39° 42' 49.45"E 9.231 S48° 07' 17.56"E 9.470 S00° 17' 25.16"E 11.283 S37° 08' 01.31"E 17.872 R=17.000 L=9.298 Δ=031.3376 R=8.000 L=6.678 Δ=047.8312 R=7.000 L=4.501 Δ=036.8434 RENTON CITY OF La s t S a v e d b y : Li J 1 o n : Ap r 1 9 , 2 0 2 4 1 1 : 1 6 A M F i l e : C: \ U s e r s \ U S B H 6 7 5 5 8 1 \ W S P O 3 6 5 \ N W M a r i t i m e P r o j e c t s - P r o j e c t s \ 3 0 9 0 2 2 1 1 \ 0 0 0 \ C A D D \ D w g s \ 0 2 _ C 0 8 . d w g Co p y r i g h t © W S P U S A I n c . A l l R i g h t s R e s e r v e d . WSP USA Inc. Suite 300 Federal Way, WA 98003-2600 TEL: (206) 431-2300 FAX: (206) 431-2250 33301 9th Avenue South XX X X - X X X X X XX X X - X X X X X X CX X X X X X X XX X - X X - X X X X feet 6030300 scale WETLAND A WETLAND C GRADING EXTENTS WETLAND B WETLAND D 1 0 0 Y E A R F L O 0 D P L A I N 10 0 Y E A R F L O 0 D P L A I N FL O O D W A Y FL O O D W A Y 5 0 0 Y E A R F L O 0 D P L A I N SPUR 2 SPUR 1 NOTES: 1.SEE DRAWINGS C-9, C-10, AND C-11 FOR TRAIL GRADING AND VERTICAL PROFILES. 2.TREES NOT SHOWN FOR PLAN CLARITY. SEE DRAWING C-7 FOR TREE RETENTION AND LAND CLEARING PLAN. EXISTING NORTH MAY CREEK TRAIL BOARDWALK BOARDWALK LEGEND BOARDWALK GRADING EXTENTS EXISTING TRAIL SUMMARY OF QUANTITIES -ORGANIC MATERIAL TO BE REMOVED FROM SITE AND DISPOSED OF IN AN APPROVED LANDFILL FOR TRAIL CONSTRUCTION IS 235 CUBIC YARDS. QUANTITY TO BE VERIFIED BY CONTRACTOR. -SELECT BORROW TO BE IMPORTED FROM APPROVED BORROW FACILITY FOR TRAIL CONSTRUCTION IS APPROXIMATELY 185 CUBIC YARDS. -FINE BARK MULCH TO BE IMPORTED FROM APPROVED BORROW FACILITY FOR TRAIL CONSTRUCTION IS APPROXIMATELY 73 CUBIC YARDS. -CRUSHED SURFACING BASE COURSE TO BE IMPORTED FROM APPROVED BORROW FACILITY FOR TRAIL CONSTRUCTION IS APPROXIMATELY 221 CUBIC YARDS. PLAN - SITE LAYOUT AND ALIGNMENT CONTROL SCALE: 1" = 30' POB N: 196148.10 E: 1302432.74 START OF BOARDWALK STA 3+33.02 END OF BOARDWALK STA 4+23.11 START OF BOARDWALK STA 4+94.30 END OF BOARDWALK STA 6+37.90 SITE LAYOUT & TRAIL HORIZONTAL ALIGNMENT CONTROL PLAN MAY CREEK TRAIL 60 % S U B M I T T A L - N O T F O R C O N S T R U C T I O N SOUTH TRAIL DESIGN PP P - S S - T T T T 3224059109 CITY OF RENTON 3224059081 CITY OF RENTON 3224059109 CITY OF RENTON S R 4 0 5 ( W S D O T ) LA K E W A S H I N G T O N B L V D . S R 4 0 5 ( W S D O T ) KI N G C O U N T Y P A R K S (F O R M E R B N S F R R ) 35 40 45 50 37 36 3 5 3 4 3 3 33 41 35 32 32 31 3 3 40 31 55 45 55 50 4 0 35 34 3 4 3 3 3 1 39 55 60 50 35 35 37 38 39 38 37 3 7 36 37 38 37 0+ 0 0 1+00 2+00 3 + 0 0 4 + 0 0 5+ 0 0 6+00 7+00 8+00 8+45 0+0 0 1 + 0 0 1 + 1 8 0+05.00, 6.00 Rt DITCH FL=36.81 1+25.77, 6.00 Rt DITCH FL=32.59 2+98.66, 6.11 Rt DITCH FL=35.40 PIPE INV=33.40 3+33.55, 5.98 Rt DITCH FL=37.251 4+23.07, 6.00 Rt DITCH FL=40.25 4+77.86, 5.85 Rt DITCH FL=39.92 PIPE INV=37.92 4+94.75, 6.00 Rt DITCH FL=40.54 6+37.90, 6.00 Rt DITCH FL=40.86 7+16.76, 5.83 Rt DITCH FL=39.10 PIPE INV=37.10 7+14.34, -10.28 Lt PIPE INV=36.80 15 LF 12" HDPE 11 LF 12" HDPE 20 LF 12" HDPE 16 LF 12" HDPE 4+78.10, -15.08 Lt PIPE INV=37.52 2+98.65, -10.80 Lt PIPE INV=33.08 0+60.00, -5.44 Lt PIPE INV=36.00 0+56.55, 5.34 Rt PIPE INV=35.78 BP 20+00.00 EP 20 + 9 0 . 4 0 PRC 2 0 + 3 2 . 3 1 PRC 20+71.25 B P 3 0 + 0 0 . 0 0 PR C 3 0 + 6 3 . 9 7 EP 3 0 + 7 5 . 1 5 RENTON CITY OF La s t S a v e d b y : Li J 1 o n : Ap r 1 8 , 2 0 2 4 1 0 : 4 1 P M F i l e : C: \ U s e r s \ U S B H 6 7 5 5 8 1 \ W S P O 3 6 5 \ N W M a r i t i m e P r o j e c t s - P r o j e c t s \ 3 0 9 0 2 2 1 1 \ 0 0 0 \ C A D D \ D w g s \ 0 2 _ C 0 9 . d w g Co p y r i g h t © W S P U S A I n c . A l l R i g h t s R e s e r v e d . WSP USA Inc. Suite 300 Federal Way, WA 98003-2600 TEL: (206) 431-2300 FAX: (206) 431-2250 33301 9th Avenue South XX X X - X X X X X XX X X - X X X X X X CX X X X X X X XX X - X X - X X X X feet 6030300 scale WETLAND C WETLAND A GRADING LIMITS GRADING LIMITS GRADING LIMITS SPUR 1 SPUR 2 NOTES: 1.SEE DRAWINGS C-11 AND C-12 FOR TRAIL VERTICAL PROFILES. 2.TREES NOT SHOWN FOR PLAN CLARITY. SEE DRAWING C-7 FOR TREE RETENTION AND LAND CLEARING PLAN. LEGEND BOARDWALK GRADING EXTENTS EXISTING TRAIL STORM DRAIN DITCH ROCK PAD EXISTING NORTH MAY CREEK TRAIL GRADING LIMITS M A Y C R E E K WETLAND D WETLAND B 1 0 0 Y E A R F L O 0 D P L A I N F L O O D W A Y FL O O D W A Y BOARDWALK BOARDWALK SD SD >>> 1 C-10 2 C-10 1 C-10 1 C-10 3 C-10 2 C-10 2 C-10 5 C-10 TRAIL GRADING PLAN MAY CREEK TRAIL 60 % S U B M I T T A L - N O T F O R C O N S T R U C T I O N SOUTH TRAIL DESIGN PP P - S S - T T T T 0.5 1.0 GEOGRID- REINFORCED ZONE (REINFORCEMENT LENGTH) VEGETATED COURSES CU L V E R T FA C E EMBEDDED REINFORCED SLOPE COURSE DETAIL VEGETATED REINFORCED SLOPE COURSE DETAIL COIR GEOTEXTILE (OUTSIDE LAYER) VERTICAL SPACING GEOGRID GRAVEL BORROW FOR STRUCTURAL EARTH WALL VERTICAL SPACING GEOGRID RAILROAD BALLAST SURFACE TREATMENT PER RESTORATION PLAN VARIES (SEE REINFORCED SLOPE TABLE AND DETAIL THIS SHEET) SECTION VIEW PAY LIMIT OF REINFORCED SLOPE TAIL TAIL UNDISTURBED SOIL LIVE STAKING TOPSOIL TYPE A CONSTRUCTION GEOTEXTILE FOR UNDERGROUND DRAINAGE QUANTITY VARIES (SEE REINFORCED SLOPE TABLE AND DETAIL THIS SHEET) RENTON CITY OF La s t S a v e d b y : Li J 1 o n : Ap r 1 9 , 2 0 2 4 1 : 4 7 P M F i l e : C: \ U s e r s \ U S B H 6 7 5 5 8 1 \ W S P O 3 6 5 \ N W M a r i t i m e P r o j e c t s - P r o j e c t s \ 3 0 9 0 2 2 1 1 \ 0 0 0 \ C A D D \ D w g s \ 0 2 _ C 1 0 . d w g Co p y r i g h t © W S P U S A I n c . A l l R i g h t s R e s e r v e d . WSP USA Inc. Suite 300 Federal Way, WA 98003-2600 TEL: (206) 431-2300 FAX: (206) 431-2250 33301 9th Avenue South XX X X - X X X X X XX X X - X X X X X X CX X X X X X X XX X - X X - X X X X TYPICAL TRAIL SECTION 11 C-9 SCALE: NTS TYPICAL TRAIL SECTION 22 C-9 SCALE: NTS REINFORCED SLOPE CONSTRUCTION NOTES: 1.THE GEOGRID SHALL HAVE A MINIMUM ULTIMATE TENSILE STRENGTH AS SPECIFIED IN THE REINFORCED SLOPE TABLE AND SHALL BE LISTED ON THE WSDOT QUALIFIED PRODUCTS LIST. 2.THE GEOGRID SHALL BE CUT TO LENGTHS SHOWN IN THE REINFORCED SLOPE TABLE, ALLOWING FOR REINFORCEMENT LENGTH, FACE HEIGHT, AND MINIMUM OVERLAP ON TOP OF THE LIFT WHERE SHOWN. SEE REINFORCED SLOPE TABLE (THIS SHEET) FOR GEOGRID TYPE, SIZES, AND LOCATION. 3.GEOGRID SHALL BE ORIENTED SO THE ROLL AXIS IS PARALLEL TO THE FACE OF THE EMBANKMENT. ADJACENT GEOGRID PANELS SHALL OVERLAP BY A MINIMUM OF 1.0'. SPLICES EXPOSED AT THE WALL FACE SHALL PREVENT LOSS OF BACKFILL MATERIAL THROUGH THE FACE. OFFSET SPLICES IN ONE COURSE FROM THOSE IN OTHER COURSES SUCH THAT SPLICES SHALL NOT LINE UP VERTICALLY. SPLICES PARALLEL TO THE WALL FACE WILL NOT BE ALLOWED. 4.CONTRACTOR SHALL USE TEMPORARY FORM BOARDS TO HELP CONTROL THE SHAPE, POSITIONING, AND COMPACTION OF THE FACE. FORMS ON THE PREVIOUS COURSE SHALL NOT BE REMOVED UNTIL THE SUBSEQUENT COURSE HAS BEEN CONSTRUCTED. 5.PLACE SUBSEQUENT COURSES BACK FROM THE PREVIOUS COURSE PER RATIO SHOWN IN SECTION VIEW. EMBEDDED COURSES DO NOT REQUIRE A SETBACK. 6.PLACE AND COMPACT REINFORCED SLOPE TO WSDOT STD SPEC 2-03.3(14)C METHOD D. 7.VEGETATED REINFORCED SLOPE COURSES (DETAIL THIS SHEET): PLACE COIR GEOTEXTILE/GEOGRID OVER FORM BOARD. COIR GEOTEXTILE SHALL BE OUTSIDE THE GEOGRID AND BURIED A MINIMUM OF 1.0' BETWEEN ADJACENT COURSES. REMOVE WRINKLES AND FOLDS. PLACE UNIFORM LAYER OF GRAVEL BORROW FOR STRUCTURAL EARTH WALLS (WSDOT STD SPEC 9-03.14(4)) LEAVING SPACE BEHIND FORM BOARD FOR TOPSOIL. COMPACT GRAVEL BORROW. PLACE HALF OF FINAL GRAVEL BORROW LIFT. PLACE 1.0' BERM OF TOPSOIL BEHIND FORM BOARD. LAY GEOGRID TAIL AND COIR GEOTEXTILE OVER TOPSOIL AND GRAVEL BORROW. SECURE TAIL BY PLACING REMAINDER OF GRAVEL BORROW LIFT. TENSION BY PULLING GEOGRID TAUT AND COMPLETE COMPACTION. 8.EMBEDDED REINFORCED SLOPE COURSES (DETAIL THIS SHEET): PLACE GEOGRID. TRENCH EMBANKMENT SHALL ACT AS A FORM FOR COURSE FACE. REMOVE WRINKLES AND FOLDS. PLACE UNIFORM LAYER OF GRAVEL BORROW FOR STRUCTURAL EARTH WALL (WSDOT STD SPEC 9-03.14(4)). COMPACT. PLACE ADDITIONAL GRAVEL BORROW UNTIL TOTAL DEPTH OF COURSE IS ACHIEVED. THE GEOGRID TAIL SHALL BE COVERED WITHIN FINAL LIFT TO SECURE THEN PULLED TAUT TO TENSION. COMPLETE COMPACTION. RAILROAD BALLAST MAY ACT AS A SUBSTITUTE FOR GRAVEL BORROW FOR STRUCTURAL EARTH WALL, EMBEDDED COURSES, OR ALL COURSES. 9.VEGETATED COURSES SHALL BE SEEDED PER SEEDING AND FERTILIZING. LIVE STAKE EACH COURSE; PAID FOR BY LIVE STAKE ROW. REINFORCED SLOPE GENERAL NOTES: 1.LINE BASE AND WALLS OF EXCAVATION WITH MODERATE SURVIVABILITY, NON-WOVEN, CLASS A OR B CONSTRUCTION GEOTEXTILE FOR UNDERGROUND DRAINAGE MEETING WSDOT 9-33.2(1) TABLES 1 AND 2. 2.THE GEOGRID SHALL HAVE A MINIMUM ALLOWABLE TENSILE STRENGTH, TYPE, AND LENGTH AS SPECIFIED IN THE REINFORCED SLOPE TABLE (THIS SHEET) AND SHALL BE LISTED ON THE WSDOT QUALIFIED PRODUCTS LIST. TOTAL GEOGRID LENGTH ALLOWS FOR REINFORCEMENT LENGTH, FACE HEIGHT, AND MINIMUM OVERLAP ON TOP OF THE LIFT. 3.GEOGRID SHALL BE ORIENTED SO THE ROLL AXIS IS PARALLEL TO THE FACE OF THE EMBANKMENT. ADJACENT GEOGRID PANELS SHALL HAVE A MINIMUM 1.0' OVERLAP. SPLICES EXPOSED AT THE WALL FACE SHALL PREVENT LOSS OF BACKFILL MATERIAL THROUGH THE FACE. OFFSET SPLICES IN ONE COURSE FROM THOSE IN OTHER COURSES SUCH THAT SPLICES SHALL NOT LINE UP VERTICALLY. SPLICES PARALLEL TO THE WALL FACE WILL NOT BE ALLOWED. 4.EMBEDDED COURSES SHALL BE FILLED WITH RAILROAD BALLAST. 5.COIR GEOTEXTILE SHALL BE OUTSIDE THE GEOGRID AND BURIED A MINIMUM OF 1.0' BETWEEN ADJACENT COURSES. 6.PLACE AND COMPACT GRAVEL BORROW FOR STRUCTURAL EARTH WALL TO WSDOT STD SPEC 2-03.3(14)C METHOD C. 7.PLACE SUBSEQUENT COURSES BACK FROM THE PREVIOUS COURSE PER RATIO SHOWN IN SECTION VIEW. EMBEDDED COURSES DO NOT REQUIRE A SETBACK. REINFORCED SLOPE OPTIONAL CONSTRUCTION METHOD: A.USE TEMPORARY FORM BOARDS, SUCH AS THAT DESCRIBED IN WSDOT STD PLAN D-3.09-00, TO CONTROL THE SHAPE, POSITIONING, AND COMPACTION OF THE FACE. FORMS MAY BE LEFT IN PLACE UNTIL THE NEXT COURSE HAS BEEN COMPLETED. B.VEGETATED REINFORCED SLOPE COURSES: PLACE COIR GEOTEXTILE/GEOGRID OVER FORM BOARD. REMOVE WRINKLES AND FOLDS. PLACE UNIFORM LAYER OF GRAVEL BORROW FOR STRUCTURAL EARTH WALLS LEAVING SPACE BEHIND FORM BOARD FOR TOPSOIL. COMPACT GRAVEL BORROW. PLACE HALF OF FINAL GRAVEL BORROW LIFT. PLACE 1.0' BERM OF TOPSOIL BEHIND FORM BOARD. LAY GEOGRID TAIL AND COIR GEOTEXTILE OVER TOPSOIL AND GRAVEL BORROW. SECURE TAIL BY PLACING REMAINDER OF GRAVEL BORROW LIFT. TENSION BY PULLING GEOGRID TAUT AND COMPLETE COMPACTION. C.EMBEDDED REINFORCED SLOPE COURSES: TRENCH EMBANKMENT SHALL ACT AS A FORM FOR COURSE FACE. PLACE GEOGRID. REMOVE WRINKLES AND FOLDS. PLACE UNIFORM LAYER OF RAILROAD BALLAST. TO SECURE GEOGRID TAIL, COVER TAIL WITHIN TOP OF LIFT THEN PULL TAUT TO TENSION. TYPICAL TRAIL SECTION 33 C-9 SCALE: NTS REINFORCED SLOPE DETAIL4 C-9 SCALE: NTS TYPICAL TRAIL SECTION 45 C-9 SCALE: NTS TYPICAL SECTIONS MAY CREEK TRAIL 60 % S U B M I T T A L - N O T F O R C O N S T R U C T I O N SOUTH TRAIL DESIGN PP P - S S - T T T T SYMBOL QTY BOTANICAL NAME COMMON NAME SIZE SPACING SHRUB AREAS 81,280 SF UPLAND/BUFFER RESTORATION 117 CORYLUS CORNUTA WESTERN HAZELNUT 2 GAL.5% @ 72" o.c. 263 HOLODISCUS DISCOLOR OCEAN-SPRAY 2 GAL.5% @ 48" o.c. 168 LONICERA INVOLUCRATA TWINBERRY 2 GAL.5% @ 60" o.c. 263 MAHONIA AQUIFOLIUM OREGON GRAPE 2 GAL.5% @ 48" o.c. 263 OEMLERIA CERASIFORMIS INDIAN PLUM 2 GAL.5% @ 48" o.c. 263 PHYSOCARPUS CAPITATUS PACIFIC NINEBARK 2 GAL.5% @ 48" o.c. 263 SAMBUCUS RACEMOSA RED ELDERBERRY 2 GAL.5% @ 48" o.c. 263 SYMPHORICARPOS ALBUS COMMON WHITE SNOWBERRY 2 GAL.5% @ 48" o.c. 263 ACER CIRCINATUM VINE MAPLE 2 GAL.5% @ 48" o.c. 16 ACER MACROPHYLLUM BIG LEAF MAPLE 5 GAL.5% @ 192" o.c. 468 AMELANCHIER ALNIFOLIA SERVICEBERRY 2 GAL.5% @ 36" o.c. 468 GAULTHERIA SHALLON SALAL 1 GAL.5% @ 36" o.c. 65 PICEA SITCHENSIS SITKA SPRUCE 5 GAL.5% @ 96" o.c. 1,052 POLYSTICHUM MUNITUM WESTERN SWORD FERN 1 GAL.5% @ 24" o.c. 131 PSEUDOTSUGA MENZIESII DOUGLAS FIR 5 GAL.10% @ 96" o.c. 468 RIBES SANGUINEUM RED FLOWERING CURRANT 2 GAL.5% @ 36" o.c. 468 ROSA NUTKANA NOOTKA ROSE 2 GAL.5% @ 36" o.c. 65 TSUGA HETEROPHYLLA WESTERN HEMLOCK 5 GAL.5% @ 96" o.c. 468 VACCINIUM OVATUM EVERGREEN HUCKLEBERRY 2 GAL.5% @ 36" o.c. 18,019 SF SANDY LOAM FLOODPLAIN BENCH 28 ABIES GRANDIS GRAND FIR 5 GAL.10% @ 96" o.c. 115 ACER CIRCINATUM VINE MAPLE 2 GAL.10% @ 48" o.c. 6 ACER MACROPHYLLUM BIG LEAF MAPLE 5 GAL.10% @ 192" o.c. 25 CORYLUS CORNUTA WESTERN HAZELNUT 2 GAL.5% @ 72" o.c. 203 MAHONIA AQUIFOLIUM OREGON GRAPE 2 GAL.10% @ 36" o.c. 57 OEMLERIA CERASIFORMIS OSOBERRY 2 GAL.5% @ 48" o.c. 15 PICEA SITCHENSIS SITKA SPRUCE 5 GAL.5% @ 96" o.c. 687 POLYSTICHUM MUNITUM WESTERN SWORD FERN 1 GAL.15% @ 24" o.c. 28 PSEUDOTSUGA MENZIESII DOUGLAS FIR 5 GAL.10% @ 96" o.c. 203 ROSA NUTKANA NOOTKA ROSE 2 GAL.10% @ 36" o.c. 203 SYMPHORICARPOS ALBUS COMMON WHITE SNOWBERRY 2 GAL.10% @ 36" o.c. 35,816 SF WETLAND RESTORATION 116 ALNUS RUBRA RED ALDER 5 GAL.20% @ 96" o.c. 826 CORNUS SERICEA RED TWIG DOGWOOD 2 GAL.20% @ 36" o.c. 619 PHYSOCARPUS CAPITATUS PACIFIC NINEBARK 2 GAL.15% @ 36" o.c. 87 POPULUS BALSAMIFERA BALSAM POPLAR 5 GAL.15% @ 96" o.c. 413 RUBUS SPECTABILIS SALMONBERRY 2 GAL.10% @ 36" o.c. 413 SALIX LASIANDRA PACIFIC WILLOW 2 GAL.10% @ 36" o.c. 413 SALIX SITCHENSIS SITKA WILLOW 2 GAL.10% @ 36" o.c. 7,008 SF WETLAND C SEASONALLY INUNDATED BENCH 162 CORNUS SERICEA RED TWIG DOGWOOD 2 GAL.20% @ 36" o.c. 23 FRAXINUS LATIFOLIA OREGON ASH 5 GAL.20% @ 96" o.c. 81 OPLOPANAX HORRIDUS DEVIL'S CLUB 1 GAL.10% @ 36" o.c. 203 SALIX LASIANDRA PACIFIC WILLOW 2 GAL.25% @ 36" o.c. 203 SALIX SITCHENSIS SITKA WILLOW 2 GAL.25% @ 36" o.c. 4,433 SF LIVE STAKES 256 SALIX SCOULERIANA SCOULER'S WILLOW 3-5 FT 50% @ 36" o.c. 256 SALIX SITCHENSIS SITKA WILLOW 3-5 FT 50% @ 36" o.c. 1.INVASIVE VEGETATION SHALL BE REMOVED PRIOR TO PLANTING AND PROPERLY DISPOSED OF OFF-SITE. 2.PROVIDE EROSION CONTROL JUTE NETTING ON SLOPES GREATER THAN 2:1. INSTALLATION OF EROSION CONTROL JUTE NETTING IMMEDIATELY AFTER CLEARING AND GRUBBING. 3.MITIGATION AREAS (A): INVASIVE SPECIES COVER 75% TO 100% OF HATCHED AREA. REMOVE ALL NON-NATIVE INVASIVE PLANT SPECIES AND LOCALIZED HERBICIDE TO BE APPLIED TO REMAINING ROOTS. MITIGATION AREA TO BE REPLANTED WITH 50% SHRUBS/TREES AND 50% STREAMBANK PLUS SEED MIX. THE MITIGATED AREA WILL BE PLANTED WITH A MINIMUM OF 10 SPECIES PER 500 SQUARE FEET FROM THE APPROVED PLANT SCHEDULE AT THE PERCENTAGES INDICATED. PROVIDE 3" GROUND WOOD MULCH ONLY IN THE UPLAND AREAS - DO NOT PLACE MULCH IN THE WETLAND AREAS. 4.NON-COMPENSATORY MITIGATION AREAS (B): REMOVE ALL NON-NATIVE INVASIVE PLANT SPECIES AND APPLY LOCALIZED HERBICIDE TO REMAINING ROOTS. NO MULCH IS TO BE APPLIED TO THE WETLAND AREAS. 5.SET OUT THE PLANTS ACCORDING TO PLAN AND DENSITY REQUIREMENT TO MAKE SURE THE ARRANGEMENT WORKS WELL WITH EXISTING VEGETATION. IF PLANT SPECIES LISTED ON THE SCHEDULE ARE UNAVAILABLE, REPLACEMENT SPECIES BE FROM THE APPROVED PLANT LIST MAY BE SELECTED BASED UPON AVAILABILITY PROVIDED THEY ARE NATIVE, NON-ORNAMENTAL SUBSTITUTES. 6.WHEN POSSIBLE, PLANTING SHOULD BE DONE BETWEEN MID-OCTOBER AND MID-DECEMBER. PLANTING BETWEEN MID-DECEMBER AND MID-APRIL IS ALSO APPROPRIATE BUT MORE ATTENTION TO SUPPLEMENTAL WATERING MAY BE REQUIRED. 7.IRRIGATION OF MITIGATION AREAS SHALL BE TEMPORARY AND MAINTAINED FOR 3 YEARS DURING THE PLANT ESTABLISHMENT PERIOD. SITE SHOULD BE WATERED EVERY WEEK WITH 1/2” OF WATER FROM JULY 1 TO OCTOBER 15 DURING THE FIRST YEAR OF PLANTING. NOTE THIS IS A GENERAL GUIDELINE AND MORE OR LESS WATER MAY BE NECESSARY DEPENDING ON WEATHER CONDITIONS. 8.WEEDING AROUND THE PLANTS SHOULD BE DONE AT LEAST TWICE A YEAR IN THE EARLY AND LATE SPRING. MORE FREQUENT WEEDING MAY BE REQUIRED IF INVASIVE SPECIES ARE PRESENT. 9.AFTER PLANTING, ALL TREES TO RECEIVE 6'-0" DIAMETER MULCH RING AND All SHRUBS TO RECEIVE 3'-0" DIAMETER MULCH RING. MULCH RINGS SHALL HAVE 3" OF GROUND WOOD MULCH FOR TREES ONLY IN NON-WETLAND AREAS. 10.CONTRACTOR TO VERIFY ALL QUANTITIES, MEASUREMENTS, AND SITE CONDITIONS. PLANT COUNT FOR TREES ARE SUPPLIED FOR THE CONTRACTOR'S CONVENIENCE. CONTRACTOR RESPONSIBLE FOR INSTALLING ALL PLANTS IN LOCATIONS AND QUANTITIES SHOWN GRAPHICALLY. 11.MEASUREMENTS, CALIPER, BRANCHING, GRADING QUALITY, BALLING AND BURLAPPING SHALL FOLLOW THE AMERICAN STANDARD OF NURSERY STOCK BY THE AMERICAN ASSOCIATION OF NURSERYMEN, LATEST EDITION. 12.ALL PLANT MATERIAL AND LOCATIONS TO BE INSPECTED AND APPROVED BY THE OWNER REPRESENTATIVE PRIOR TO INSTALLATION. 13.MAINTENANCE OF THE PLANTED AREAS THROUGH THE ESTABLISHMENT PERIOD SHALL INCLUDE WATERING, PROTECTION FROM INSECTS AND DISEASES, WEEDING AND PRUNING, AS WELL AS REPLACEMENT OF ANY PLANTS WHICH APPEAR TO BE IN DISTRESS. TREE STAKES SHALL BE REMOVED AFTER TWO GROWING SEASONS. DEFECTIVE PLANT MATERIALS (50% OR > DEAD) AS DETERMINED BY THE OWNER REPRESENTATIVE SHALL BE REPLACED IMMEDIATELY WITH SPECIMENS OF THE SAME SPECIES AND SIZE OF THE ORIGINAL. 14.DURING INSTALLATION THE OWNER REPRESENTATIVE NOTIFY THE CONTRACTING OFFICER OF ANY CONDITIONS WHICH MAY BE HARMFUL TO PLANT LIFE, SUCH AS POOR DRAINAGE, HAZARDOUS MATERIALS, ETC. THE LANDSCAPE CONTRACTOR SHALL MAKE A RECOMMENDATION TO ADDRESS THE SPECIFIC SITUATION. 19.INTERPLANTING OF VEGETATION WILL OCCUR IN AN EXISTING FOREST CANOPY AND TREE NUMBERS MAY BE LESS THAT THOSE CALCULATED TO AVOID SHADING THEM OUT UNDER THE EXISTING CANOPY. 23.HERBIVORY/BEAVER PROTECTION MAY NEED TO BE INSTALLED. THERE ARE TREES THAT HAVE BEEN FELLED BY BEAVERS IN THE AREA AND THE SITE IS FREQUENTLY USED BY DEER. 24.ROCK & DEBRIS (LARGER THAN 1" IN DIAMETER) IN PLANTING PITS SHALL BE REMOVED. 25.PROTECT EXISTING TREES TO REMAIN DURING CONSTRUCTION, SEE SPECIFICATIONS. 26.CONTRACTOR SHALL NOT PLANT TREES UNDER OR OVER EXISTING UTILITY LINES IF PRESENT WITHOUT THE EXPRESSED CONSENT OF THE CITY. GENERAL NOTES: 1.SEE L-2 FOR LANDSCAPE PLAN. 2.SEE L-3 & L-4 FOR LANDSCAPE DETAILS. 3.SEE CIVIL DRAWING TRAIL GRADING AND ALIGNMENT. LANDSCAPE NOTES:PLANT SCHEDULE: RENTON CITY OF La s t S a v e d b y : US D W 6 7 5 5 7 3 o n : Ap r 1 9 , 2 0 2 4 1 2 : 0 7 P M F i l e : C: \ U s e r s \ U S B H 6 7 5 5 8 1 \ W S P O 3 6 5 \ N W M a r i t i m e P r o j e c t s - P r o j e c t s \ 3 0 9 0 2 2 1 1 \ 0 0 0 \ C A D D \ D w g s \ 0 3 _ L 0 1 . d w g Co p y r i g h t © W S P U S A I n c . A l l R i g h t s R e s e r v e d . WSP USA Inc. Suite 550 Tacoma, WA 98402 TEL: (206) 431-2300 FAX: (206) 431-2250 1201 Pacific Ave XX X X - X X X X X XX X X - X X X X X X CX X X X X X X XX X - X X - X X X X PLANT SCHEDULE & LANDSCAPE NOTES MAY CREEK TRAIL 60 % S U B M I T T A L - N O T F O R C O N S T R U C T I O N SOUTH TRAIL DESIGN PP P - S S - T T T T F L O O D F L O O D F L O O D F L O O D FLOO D FLOO D FLO O D F L O O D F L O O D F L O O D F L O O D F L O O D FL O O D FL O O D FL O O D FL O O D FL O O D FL O O D FL O O D FL O O D FL O O D FL O O D FL O O D FL O O D FL O O D FLO O D FL O O D FL O O D FL O O D FL O O D FL O O D FL O O D FL O O D FLO O D FLO O D FLO O D FLO O D FL O O D FL O O D FL O O D FL O O D FL O O D FL O O D FL O O D F L O O D F L O O D FL O O D FL O O D FL O O D FL O O D F L O O D FLO O D FL O O D FL O O D FLO O D FLOOD FLOODFLOODFLOOD FLOOD FLOO D FLO O D FLO O D FLO O D FLO O D 100Y R 10 0 Y R 10 0 Y R 10 0 Y R 10 0 Y R 100 Y R 10 0 Y R 10 0 Y R 1 0 0 Y R 1 0 0 Y R 1 0 0 Y R 1 0 0 Y R 10 0 Y R 10 0 Y R 1 0 0 Y R 1 0 0 Y R 100 Y R 10 0 Y R 1 0 0 Y R 1 0 0 Y R 1 0 0 Y R 1 0 0 Y R 1 0 0 Y R 1 0 0 Y R 1 0 0 Y R 1 0 0 Y R 1 0 0 Y R 1 0 0 Y R 10 0 Y R 10 0 Y R 100YR 100YR 100YR 100YR 100YR 100YR UPLAND/BUFFER RESTORATION SANDY LOAM FLOODPLAIN BENCH WETLAND RESTORATION WETLAND C SEASONALLY INUNDATED BENCH LIVE STAKES ORDINARY HIGH WATER LINE FLOODWAY LINE 100 YEAR FLOOD LINE OHWM FLOOD FLOOD 100YR feet 6030300 scale WETLAND A WETLAND C CLEARING LIMITS - TYP WETLAND B WETLAND D 5 0 0 Y E A R F L O 0 D P L A I N SPUR 2 SPUR 1 NOTES: 1.SEE L-1 FOR PLANT SCHEDULE AND LANDSCAPE NOTES. 2.SEE L-3 & L-4 FOR LANDSCAPE DETAILS. 3.SEE CIVIL DRAWING TRAIL GRADING AND ALIGNMENT. EXISTING NORTH MAY CREEK TRAIL REMOVABLE BOLLARD BENCH BOARDWALK BOARDWALK PRO P O S E D B R I D G E 6' WIDE BARK MUCH TRAIL W/ 1' MULCH SHOULDERS AND 4'-WIDE DITCH SPLIT RAIL FENCE SPLIT RAIL FENCE BENCH RENTON CITY OF La s t S a v e d b y : US D W 6 7 5 5 7 3 o n : Ap r 1 9 , 2 0 2 4 1 2 : 0 4 P M F i l e : C: \ U s e r s \ U S B H 6 7 5 5 8 1 \ W S P O 3 6 5 \ N W M a r i t i m e P r o j e c t s - P r o j e c t s \ 3 0 9 0 2 2 1 1 \ 0 0 0 \ C A D D \ D w g s \ 0 3 _ L 0 2 . d w g Co p y r i g h t © W S P U S A I n c . A l l R i g h t s R e s e r v e d . WSP USA Inc. Suite 550 Tacoma, WA 98402 TEL: (206) 431-2300 FAX: (206) 431-2250 1201 Pacific Ave XX X X - X X X X X XX X X - X X X X X X CX X X X X X X XX X - X X - X X X X 6' WIDE BARK MUCH TRAIL W/O SHOULDERS - CONNECT TO EXISTING TRAIL MITIGATION AREAS (A) - TYP NON-COMPENSATORY MITIGATION AREAS (B) - TYP NON-COMPENSATORY MITIGATION AREAS (B) - TYP MITIGATION AREAS (A) - TYP LANDSCAPE LEGEND LANDSCAPE PLAN MAY CREEK TRAIL 60 % S U B M I T T A L - N O T F O R C O N S T R U C T I O N SOUTH TRAIL DESIGN PP P - S S - T T T T APPENDIX B SPECIES LIST APPENDIX C ESSENTIAL FISH HABITAT DRAFT Biological Assessment WSP USA, 30902211.000 City of Renton, May Creek Trail South Project September 2024 Renton, Washington Appendix C – Essential Fish Habitat Page C-2 of 2 APPENDIX C ESSENTIAL FISH HABITAT Public Law 104-297, the Sustainable Fisheries Act of 1996, amended the Magnuson-Stevens Fishery Conservation and Management Act (Magnuson-Stevens Act) to establish new requirements for Essential Fish Habitat (EFH) descriptions in federal fishery management plans and to require federal agencies to consult with the National Oceanic and Atmospheric Administration (NOAA) National Marine Fisheries Service (NOAA NMFS) on activities that may adversely affect EFH. The Magnuson-Stevens Act requires consultation for all federal agency actions that may adversely affect EFH. The action area is within designated EFH for Pacific salmon. EFH for Pacific salmon in fresh water includes all streams, lakes, ponds, wetlands, and other currently viable bodies of fresh water and the substrates within those waterbodies accessible to Pacific salmon. Activities occurring above impassable barriers that are likely to adversely affect EFH below impassable barriers are subject to the consultation provisions of the Magnuson- Stevens Act. The Magnuson-Stevens Act requires consultation for all federal agency actions that may adversely affect EFH. EFH consultation with NOAA NMFS is required by federal agencies undertaking, permitting, or funding activities that may adversely affect EFH, regardless of its location. Under Section 305(b)(4) of the Magnuson-Stevens Act, NOAA NMFS is required to provide EFH conservation and enhancement recommendations to federal and state agencies for actions that adversely affect EFH. Wherever possible, NOAA NMFS uses existing interagency coordination processes to fulfill EFH consultations with federal agencies. For the proposed action, this goal is being met by incorporating EFH consultation into the Endangered Species Act (ESA) Section 7 consultation, as represented by this Biological Assessment (BA). Location The action area is located in King County in Section 32 of Township 24N Range 05E, within the 8.21-acre tax parcel 322405-9109, and is defined as the limits of the Project that will be affected directly or indirectly by the Project. The project site is bordered by Interstate 405 (I-405) to the east and bordered by Lake Washington Boulevard N and dense neighborhood to the west. May Creek runs through the site and the Ordinary High Water Mark (OHWM) was delineated in December 2022 by WSP. There is an existing nature trail, May Creek Trail, on the north side of May Creek. There are four (4) wetlands located at May Creek Park, delineated in December 2022 by WSP and documented in the May Creek Trail Project Wetlands and Waterbodies Delineation and Assessment Report. These wetlands have been labeled as Wetland A, Wetland B, Wetland C, and Wetland D. Description of Project Activities The purpose of the Project is a soft surface trail and bridge at the May Creek Park greenway in Renton, Washington. The proposed soft surface trail will be one-quarter mile in length, consisting of an approximate 6 ft width trail at existing grade with two spurs (Spur 1 and Spur 2) DRAFT Biological Assessment WSP USA, 30902211.000 City of Renton, May Creek Trail South Project September 2024 Renton, Washington Appendix C – Essential Fish Habitat Page C-2 of 2 leading to viewing areas, boardwalk portions at wetland drainage sections, and will tie into an existing trail on the north side of the creek. The bridge will be approximately 100 ft in length, approximately 6 ft in width and will cross May Creek at the eastern portion of the site. The boardwalk trail and bridge will have grated decking. The new bridge will conform to ADA accessibility guidelines. Potential Adverse Effects of Project Activities The proposed action has the potential to affect EFH for Pacific salmon species. Specific elements of the proposed action that could potentially impact EFH are summarized here (see Section 7.0 for a detailed analysis of the potential effects of the project). Direct effects of the proposed action will be largely temporary in nature. Temporary impacts to habitat will be limited to the potential for temporarily impaired water quality conditions and temporarily elevated noise levels within the action area. Minimization Measures and Best Management Practices Conservation/minimization measures and best management practices (BMPs) that will be implemented by the project are discussed in Section 2.3 in the BA. Implementation of these minimization measures and BMPs will be sufficient to ensure that any impacts to EFH are temporary and insignificant, and do not affect any functional component of EFH for Pacific salmon species. Conclusions In accordance with the EFH requirements of the Magnuson-Stevens Act, it has been determined that the project “may affect, but is not likely to adversely” EFH for Pacific salmon species. The proposed action has incorporated minimization and avoidance measures, and BMPs intended to avoid and/or minimize potential effects to habitat. Water quality and noise impacts that may result during construction will be temporary and will result in no significant effects to any functional component of EFH for Pacific salmon species.