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HomeMy WebLinkAboutRS_22_GE Cedar River 205 Critical Areas Assessment_211019 Critical Areas Assessment Report Cedar River 205 Levee Certification Project Renton, Washington for Tetra Tech, Inc October 19, 2021 Critical Areas Assessment Report Cedar River 205 Levee Certification Project Renton, Washington for Tetra Tech, Inc October 19, 2021 1101 South Fawcett Avenue, Suite 200 Tacoma, Washington 98402 253.383.4940 Critical Areas Assessment Report Cedar River 205 Levee Certification Project Renton, Washington File No. 0693-078-01 October 19, 2021 Prepared for: Tetra Tech, Inc. 1420 5th Avenue, Suite 650 Seattle, Washington 98101 Attention: Bill Fullerton Prepared by: GeoEngineers, Inc. 1101 South Fawcett Avenue, Suite 200 Tacoma, Washington 98402 253.383.4940 Emily R. Hurn Project Scientist David B. Conlin, MS, PWS Senior Biologist Joseph O. Callaghan, MS, PWS Principal ERH:DBC:JOC:ch:leh:tlm Disclaimer: Any electronic form, facsimile or hard copy of the original document (email, text, table, and/or figure), if provided, and any attachments are only a copy of the original document. The original document is stored by GeoEngineers, Inc. and will serve as the official document of record. October 19, 2021| Page i File No. 0693-078-01 1.0 INTRODUCTION .................................................................................................................................................. 1 1.1. Project Location .......................................................................................................................................... 1 1.2. Project Description ...................................................................................................................................... 1 1.3. Reach Description ....................................................................................................................................... 2 2.0 DATA REVIEW .................................................................................................................................................... 2 3.0 FIELD INVESTIGATION ....................................................................................................................................... 3 3.1. Wetland Observations ................................................................................................................................ 3 3.2. Stream and Riparian Habitat ..................................................................................................................... 3 3.2.1. Right Bank, STA 49+60 .................................................................................................................. 4 3.2.2. Right Bank, STA 63+65 to 64+35.................................................................................................. 4 3.2.3. Right Bank, STA 66+55 to 67+25.................................................................................................. 4 3.2.4. Left Bank, STA 19+20 ..................................................................................................................... 4 3.2.5. Left Bank, STA 25+45 to 29+70 .................................................................................................... 5 3.2.6. Left Bank, STA 29+70 to 34+10 .................................................................................................... 5 3.2.7. Left Bank, STA 55+70 to 56+90 .................................................................................................... 5 3.2.8. Left Bank, STA 58+10 to 58+50 .................................................................................................... 5 3.2.9. Left Bank, STA 58+55 to 59+15 .................................................................................................... 5 3.2.10. Left Bank, STA 59+15 to 59+85 .................................................................................................... 6 4.0 CONCLUSIONS ................................................................................................................................................... 6 5.0 LIMITATIONS ...................................................................................................................................................... 6 6.0 REFERENCES ..................................................................................................................................................... 7 LIST OF FIGURES Figure 1. Cedar River Section 205 Levee System Improvement Locations Overview and Vicinity Map Figures 2 through 6. Cedar River Section 205 Levee System Improvement Locations APPENDICES Appendix A. National Wetland Inventory Map Appendix B. Soil Survey Map Appendix C. Site Photographs October 19, 2021| Page 1 File No. 0693-078-01 1.0 INTRODUCTION GeoEngineers, Inc. (GeoEngineers) was contracted by Tetra Tech, Inc. (Tetra Tech) to complete a baseline critical area assessment and prepare a Critical Areas Assessment Report for the Cedar River 205 Levee Certification Project, located on both banks of the lower Cedar River within the city limits of Renton, Washington. The City of Renton is proposing to perform a series of improvements at several locations along the levee to meet current flood design standards. This Critical Areas Assessment Report describes the wetland, stream and riparian conditions present at the location of each of the proposed levee improvements and has been prepared in accordance with City of Renton Municipal Code (RMC) 4-3-050 (Critical Areas Regulations), 4-3-090 (Shoreline Management Program) and 4-8-120 (Permit Submittal Requirements). This report describes existing conditions and regulations applicable to wetlands and stream/riparian habitats and is intended to be used as a basis for mitigation sequencing during project design and environmental permitting. 1.1. Project Location The project reach is located along the Cedar River at the south end of Lake Washington in Renton, Washington within Township 23 North, Range 5 West, Sections 7 and 18. The upstream side of the Logan Avenue bridge is the upstream (southern) limit of the project reach, and the mouth of the Cedar River at Lake Washington is the downstream (northern) reach boundary. This investigation was limited to the areas of the proposed improvements. A Vicinity Map is included as Figure 1, Cedar River Section 205 Levee System Improvement Locations Overview and Vicinity Map. 1.2. Project Description Potential levee improvements include modifications to the existing levee and floodwall system along both the left and right bank of the Cedar River. The purpose of these improvements is to meet levee elevation, freeboard and other technical requirements in accordance with the current flood model and levee criteria. Figures 2 through 6, Cedar River Section 205 Levee System Improvement Locations show the locations of each potential improvement area in detail. A summary of the proposed locations and description of potential improvements are provided below: TABLE 1. SUMMARY OF LEVEE IMPROVEMENT AREAS Levee Stationing Description of Improvement Right Bank 49+60 Improve Transition from Levee Embankment to Wall 63+65 to 64+35 Raise/Regrade Levee Embankment 66+55 to 67+25 Raise/Extend Existing Wall Left Bank 19+20 Improve Transition from Levee Embankment to Wall 25+45 to 29+70 Raise Floodwall 29+70 to 34+10 Raise Levee Embankment with Curb Wall 55+70 to 56+90 Widen Levee Crest with Retaining Wall 58+10 + 58+50 Construct Floodwall October 19, 2021| Page 2 File No. 0693-078-01 Levee Stationing Description of Improvement 58+55 to 59+15 Reconstruct Damaged Floodwall 59+15 to 59+85 Raise/Regrade Levee Embankment 1.3. Reach Description There are three bridges within the project reach, including (from upstream to downstream): Logan Avenue Bridge, South Boeing Bridge and North Boeing Bridge. Renton Municipal Airport is located west of the left bank of the lower river (below Logan Avenue), Boeing facilities and a public park (Cedar River Trail Park) are located east of the right bank of the lower river, and other commercial, industrial and residential developments are present above Logan Avenue. Within the project reach, between river mile 0 and 1.23, the Cedar River is a constructed channel that historically has required periodic maintenance and dredging of the bed elevation to ensure flood protection. The river is channelized through the project reach and the banks are armored in numerous areas with riprap, concrete, gabion baskets and/or wood retaining walls. Vegetation within the riparian zone along this stretch of the Cedar River is comprised of a mix of: mature native trees and shrubs; recently planted native trees, shrubs and herbaceous species that were installed as mitigation for the 2016 dredging; park landscaping trees, shrubs and mowed grasses; unmaintained grass areas; and sections dominated by invasive species. Native tree species located within the riparian zone include red alder (Alnus rubra), Pacific willow (Salix lasiandra), Sitka willow (Salix sitchensis) and black cottonwood (Populus balsamifera ssp. trichocarpa). Additional native shrubs and herbaceous species within the riparian zone include vine maple (Acer circinatum), snowberry (Symphoricarpos albus), Nootka rose (Rosa nutkana), clustered wild rose (Rosa pisocarpa), redosier dogwood (Cornus sericea), twinberry (Lonicera involucrate), Pacific ninebark (Physocarpus capitatus), sword fern (Polystichum munitum), lady fern (Athyrium filix-femina) and scouring rush (Equisetum hyemale). Many of these species were recently installed. Typical invasive species include Japanese knotweed (Polygonum cuspidatum), reed canary grass (Phalaris arundinacea), Himalayan blackberry (Rubus armeniacus) and Scotch broom (Cytisus scoparius). 2.0 DATA REVIEW Wetlands and the ordinary high water mark (OHWM) of the Cedar River were previously delineated in preparation for the 2016 maintenance dredging (GeoEngineers 2013). Wetland impacts during dredging were mitigated in accordance with approved permits obtained from the United States Army Corps of Engineers (USACE), Washington Department of Fish and Wildlife (WDFW), Washington State Department of Ecology (Ecology) and City of Renton. A post-dredge wetland delineation was completed in accordance with these permits and the post-dredge wetland conditions were documented (GeoEngineers 2017). A total of seven wetlands were documented in the post-dredge condition, all of which are along the right bank of the river. Environmental maps of the project area available from public sources were also collected and reviewed. The United States Fish and Wildlife Service (USFWS) National Wetlands Inventory (NWI) online mapper (USFWS 2019) shows a freshwater riverine wetland mapped within the banks of the Cedar River itself. The United States Department of Agriculture (USDA) Natural Resources Conservation Service (NRCS) Web Soil Survey shows urban land, 0 to 5 percent slopes, in and adjacent to the project reach (USDA-NRCS 2019). October 19, 2021| Page 3 File No. 0693-078-01 An NWI map from USFWS is included as Appendix A, National Wetland Inventory Map and soil survey map from USDA-NRCS as Appendix B, Soil Survey Map. The project reach is within the jurisdiction of the City of Renton’s Shoreline Management Program (SMP) (RMC 4-3-090(B)(2)(a)). Critical areas within the shoreline jurisdiction are generally regulated under the SMP rather than the Critical Areas Regulations, as referenced in the following sections. The shoreline environment classification throughout the project reach is “high intensity” (City of Renton 2018). Additional information was obtained from the Washington State Department of Natural Resources (DNR) Forest Practices Application Review System (FPARS) and WDFW SalmonScape mapping application (DNR 2019; WDFW 2019). Cedar River is a Shoreline of the State (DNR 2019: Washington Administrative Code [WAC] 173-18-210). According to WDFW (2019), Cedar River supports fall Chinook Salmon (Onchorynchus tshawytscha), Coho Salmon (O. kisutch), Sockeye Salmon (O. nerka), Bull Trout (Salvelinus confluentus), resident Cutthroat Trout (O. clarkii) and winter Steelhead Trout (O. mykiss) throughout the project reach. 3.0 FIELD INVESTIGATION Two GeoEngineers’ wetland scientists conducted a field investigation on September 23, 2019, to characterize and document habitat features at each proposed levee improvement area. A photographic record was collected during the field visit to document existing site conditions and is provided in Appendix C, Site Photographs. 3.1. Wetland Observations We field-verified that none of the wetlands identified during the post-dredge wetland assessment (GeoEngineers 2017) are located within the vicinity of the proposed improvement areas and that no new wetlands had developed within the project reach. 3.2. Stream and Riparian Habitat The OHWM is used to define the jurisdictional boundary of streams, Rivers and Shoreline Areas (RMC 4-3- 090(B)(3), WAC 222-16-031), for state Shoreline Management Act regulations (Revised Code of Washington [RCW] 90.58.030(2)(c)), and federal Clean Water Act (CWA) regulations (USACE 2005). GeoEngineers delineated the OHWM as part of the Cedar River Dredge Project (GeoEngineers 2013) which covers the entire project area for the proposed levee improvements. As the river system within the project reach has been historically channelized and heavily modified as a result of recurrent dredging, the OHWM of the river has not changed since the prior survey work was completed, which was field-verified at each proposed improvement location. The OHWM previously delineated and surveyed for the City of Renton is therefore considered current and is depicted on Figures 2 through 6 accompanying this report. According to RMC 4-3-050(L)(1)(a)(i), the Cedar River is considered a Class 1 stream because it is classified as a Shoreline of the State. Class 1 streams are not subject to Renton’s Critical Areas Regulations but are instead regulated under the SMP Regulations (RMC 4-3-050(B)(1)(j)(iii); RMC 4-3-090(D)(2)(c)(iii)). The shoreline jurisdiction extends 200 feet from the OHWM, within which proposed uses and activities are subject to the SMP (RMC 4-3-090(B)(3)(a)). Within this jurisdictional area, the standard vegetation conservation buffer width is 100 feet from the OHWM (RMC 4-3-090(F)(1)(a)), within which vegetation October 19, 2021| Page 4 File No. 0693-078-01 “shall be managed to provide the maximum ecological functions feasible” (RMC 4-3-090(F)(1)(i)). This “vegetation conservation buffer” is shown on Figures 2 through 6. A summary of each of the improvement locations and observations of habitat conditions within each associated investigation area is provided in the sections below. 3.2.1. Right Bank, STA 49+60 This area is located to the south side of South Boeing bridge on the right bank of the Cedar River (Figure 2). The proposed improvements involve improving the transition between the levee and floodwall. The existing earthen levee consists of maintained lawn and is at slightly lower elevation than the floodwall. There is also a utility vault at the connection between the levee and floodwall. Growing on the levee are two chestnut (Castanea sp) trees that are approximately 25 to 30 feet towards the river. There are landscaped shrubs waterward of the floodwall, including tall Oregon grape (Mahonia aquifolium). Photographs 1 and 2 provide detail on site conditions at this location (Figure C-1). 3.2.2. Right Bank, STA 63+65 to 64+35 This area is located to the northwest of Logan Avenue on the right bank of the Cedar River (Figure 3). The proposed improvements include raising the existing earthen levee and sidewalk to meet freeboard requirements. This location is adjacent to a parking lot and an intersection of two sidewalks that are associated with the Cedar River Trail Park and Logan Avenue. Native vegetation is generally absent in the vicinity of the improvement location; vegetation consists of maintained lawn, an exotic maple (Acer sp), landscaping shrubs near the road edge, and a rhododendron near the curb. Photographs 3 and 4 provide detail on site conditions at this location (Figure C-2). 3.2.3. Right Bank, STA 66+55 to 67+25 This area is adjacent to a senior center along the right bank of the Cedar River (Figure 3). This is the only location investigated that is outside of the 100-foot riparian conservation buffer based on the OHWM of the Cedar River (but is within the 200-foot shoreline management zone). The proposed improvements in this area include modifying the area in front of the senior center by adding a low wall and berm and regrading as necessary to meet freeboard requirements. Currently there is a row of landscaped shrubs and a small concrete pad for the building entrance within this area of the proposed improvements. A large locust (Robinia sp.) tree is located to the southwest of the improvement area and may be impacted by activities, although a goal of the design is to minimize impacts to the tree. There is a large area of shrub and tree species located northwest (towards Logan Avenue), adjacent to the area of proposed improvements. This vegetation is a mix of species consisting of rhododendron, barberry (Mahonia sp.), English ivy (Hedera helix), yellow flag iris (Iris pseudacorus) and Himalayan blackberry. Depending on how the improved section ties into existing high ground in this area, there could be additional impacts to this vegetation, which includes native and invasive species. Photographs 5 and 6 provide details on site conditions at this location (Figure C-3). 3.2.4. Left Bank, STA 19+20 The proposed improvements in this area are focused on repairing the transition from the existing levee wall to the earthen berm along the left bank of the Cedar River (Figure 4). Native vegetation at the improvement area consists of one young red alder (Alnus rubra) and a few field horse tail (Equisetum arvense) plants. From the levee crest and wall to the river, vegetation is dominated by invasive species such as Scotch October 19, 2021| Page 5 File No. 0693-078-01 broom and common tansy (Tanacetum vulgare). On the landward side of the levee crest, vegetation is limited to mowed grass. Site photographs are provided on Figure C-4 on Photographs 7 and 8. 3.2.5. Left Bank, STA 25+45 to 29+70 The proposed improvements in this area include raising the existing floodwall by 0.1 to 0.6 feet by adding a concrete cap on the existing wall (Figure 5). Vegetation on the river side of the levee is mixed in the vicinity of the proposed improvement, with invasive species dominant, consisting of Himalayan blackberry, Scotch broom, knotweed (Fallopia japonica) and common tansy. Native species present include snowberry (Symphoricarpos albus) and field horse tail. Behind the floodwall, vegetation is limited, consisting of small patches of maintained grasses. This area is otherwise paved for the access road, adjacent vehicle storage areas and buildings (hangars). Site photographs are provided on Figure C-5 on Photographs 9 and 10. 3.2.6. Left Bank, STA 29+70 to 34+10 Proposed improvements in this location include raising the existing levee embankment by 0.1 to 0.6 feet by adding a curb wall (Figure 5). As observed in the other locations, invasive species are dominant on the river side of the levee, consisting of Himalayan blackberry, Scotch broom, knotweed, common tansy, Japanese knotweed and Canada thistle (Cirsium arvense). Additional native species are present within this area and consist of snowberry, willow species (Salix spp.), Nootka rose (Rosa nutkana), Oregon ash (Fraxinus latifolia) and Pacific ninebark (Physocarpus capitatus). Behind the levee, there are limited patches of maintained grasses and paved areas, including the airport access road. Site photographs are provided on Figure C-6 on Photographs 11 and 12. 3.2.7. Left Bank, STA 55+70 to 56+90 This area is located on the north side of the Logan Avenue Bridge and will include modifications to the existing earthen levee section to meet top width requirements (Figure 6). Proposed improvements include the addition of a retaining wall to allow for widening the crest of the levee without encroaching on East Perimeter Road. Riparian vegetation within this area directly downslope of the levee includes a large patch of Japanese knotweed with Scotch broom to the north. There are two large cottonwood trees directly south of the floodwall/levee transition growing within the top of the earthen berm, each approximately 20 inches diameter at breast height (DBH). There is also a standing snag near the OHWM, downslope from the levee crest. On the landward side of the floodwall and levee, there are limited patches of maintained grasses and a public road providing access to the airport. Site photographs are provided on Figure C-7 on Photographs 13 and 14. 3.2.8. Left Bank, STA 58+10 to 58+50 This area is on the south side of the Logan Avenue Bridge along the left bank of the river (Figure 6). The proposed improvements include constructing a floodwall approximately 1.1 feet high adjacent to the sidewalk to provide adequate freeboard above the base flood elevation. Sidewalk and roadway border this improvement location, with limited amounts of landscaped vegetation consisting of non-native shrub species. Photograph 15 illustrates the site conditions of the proposed improvements (Figure C-8). 3.2.9. Left Bank, STA 58+55 to 59+15 This area is on the south side of Logan Avenue Bridge along the left bank of the river (Figure 6). There is an existing concrete wall that borders a planting strip and gravel parking lot that needs to be rebuilt due to October 19, 2021| Page 6 File No. 0693-078-01 structural damage and raised in elevation. The vegetation that will likely be affected by improvements at this location include landscaped shrubs and one medium-sized ash (Franxinus sp.) tree. Photographs 16 and 17 provide detail on site conditions at this location (Figures C-8 and C-9). 3.2.10. Left Bank, STA 59+15 to 59+85 This area consists of an earthen berm that is covered in maintained grass adjacent to the recreational trail along the river (Figure 6, Photograph 18 on Figure C-9). The proposed improvements involve re-grading the berm to a higher elevation. Manicured grass covers the berm at this location and extends into a larger open lawn area associated with a riverside park. No other vegetation besides maintained grass would be impacted by activities at this location. 4.0 CONCLUSIONS This Critical Areas Assessment Report documents baseline conditions of regulated habitats and riparian vegetation that may be impacted by the proposed Cedar River 205 Levee Certification Project within the specific improvement locations. Proposed improvements will be restricted to upland areas based on the OHWM previously delineated for this site, which was field-verified by GeoEngineers in September 2019. However, the project is anticipated to impact some riparian vegetation within the Vegetation Conservation Buffer specified in the City of Renton’s SMP. Riparian vegetation adjacent to the proposed improvements are of limited value, consisting largely of invasive species and mowed grass/lawn areas. Some native vegetation may also be impacted, which will likely require mitigation to comply with the SMP, WDFW Hydraulic Project Approval requirements for compliance with the WAC, and other federal and state regulations such as State Environmental Policy Act (SEPA), National Environmental Policy Act (NEPA) and the Endangered Species Act. This report provides a basis for identifying appropriate mitigation for project impacts, which will be identified and developed once project designs and construction sequences are advanced to suitable levels for environmental permitting. In general, the project is not anticipated to require wetland or waterbody impact or mitigation, other than impacts to riparian vegetation. Conceptual mitigation for these temporary impacts is anticipated to be achieved by replanting vegetated areas impacted during construction activities. 5.0 LIMITATIONS GeoEngineers has prepared this Critical Areas Assessment Report in general accordance with the scope and limitations of our proposal. Within the limitations of scope, schedule and budget, our services have been executed in accordance with the generally accepted practices for wetland and stream delineation and assessment in this area at the time this report was prepared. No warranty or other conditions, express or implied, should be understood. This report has been prepared for the exclusive use by Tetra Tech, Inc., the City of Renton, authorized agents and regulatory agencies following the described methods and information available at the time of the work. No other party may rely on the product of our services unless we agree in advance to such reliance in writing. The information contained herein should not be applied for any purpose or project except the one originally contemplated. October 19, 2021| Page 7 File No. 0693-078-01 The applicant is advised to contact all appropriate regulatory agencies (local, state and federal) prior to design or construction of any development to obtain necessary permits and approvals. 6.0 REFERENCES City of Renton. Renton Municipal Code, Title 4-3-090 – Shoreline Master Program Regulations. Available at: http://www.codepublishing.com/wa/renton/. City of Renton. 2018. Draft Shoreline Master Program Updates. Available at https://edocs.rentonwa.gov/ Documents/1/edoc/1325425/SMP%20Draft%20Changes%2020181121%20Public%20Review% 20Draft.pdf. GeoEngineers, Inc. (GeoEngineers). 2013. Habitat Assessment Revised Report: Wetlands and Stream/Riparian Habitats, Cedar River Maintenance Dredge Project, Renton, Washington. Prepared for Coast and Harbor Engineering. September 13, 2013. GEI File No. 0693-073-00 GeoEngineers, Inc. (GeoEngineers). 2017. Post-dredge Wetland Assessment, Cedar River Maintenance Dredging Project, Renton, Washington. Prepared for the City of Renton. September 15, 2017. GEI File No. 0693-073-03 Revised Code of Washington (RCW). Available at: https://apps.leg.wa.gov/rcw/default.aspx?cite=90.58 United States Army Corps of Engineers (USACE). 2005. Regulatory Guidance Letter 05-02: Expiration of Geographic Jurisdictional Determinations of Waters of the United States. Available at: https://www.nap.usace.army.mil/Portals/39/docs/regulatory/rgls/rgl05-02.pdf. United States Department of Agriculture – National Resource Conservation Service (USDA-NRCS). 2019. Web Soil Survey. Available at: http://websoilsurvey.nrcs.usda.gov/app/. United States Fish and Wildlife Service (USFWS). 2019. Wetlands Mapper. Available at: http://www.fws.gov/wetlands/ Data/mapper.html. Washington Administrative Code (WAC). Available at: https://apps.leg.wa.gov/wac/default.aspx?cite=173- 18 Washington Department of Fish and Wildlife (WDFW). 2019. SalmonScape Application. Version 4.0. Available at: http://wdfw.wa.gov/mapping/salmonscape/. Washington State Department of Natural Resources (DNR). 2019. Forest Practices Application Review System (FPARS) Mapping Application. Available at: https://fpamt.dnr.wa.gov/default.aspx. FIGURES 500 0 500 Feet Notes: 1. The locations of all features shown are approximate.2. This drawing is for information purposes. It is intendedto assist in showing features discussed in an attached document. GeoEngineers, Inc. cannot guarantee the accuracy and contentof electronic files. The master file is stored by GeoEngineers, Inc.and will serve as the official record of this communication. Projection: NAD 1983 HARN StatePlane Washington North FIPS 4601 Feet Legend Bank Stationing Cedar River Levee Alignment Ordinary High Water Mark (OHWM) Vegetation Conservation Buffer Identified Improvements Improve transition from levee embankment to wall Raise and extend existing wall Raise levee embankment/Regrade Floodwall/Retaining Wall P:\0\0693078\GIS\MXD\069307801_F01_OverviewVMMap.mxd Date Exported: 10/11/21 by ccabrera Cedar R i v e r FACTORYAVE N N 1ST ST STEVENSAVE N WS 115TH PLBURNETTAVE S S 2ND ST85TH AVESS 117TH PLGARDEN AVE N S122NDSTS 120TH ST84TH AVE S 87THAVE S S TOBIN STRAINIERAVES N AIRPORT WAY SHATTUCK AVES 88TH AVE SS 116TH STSTILLICUMST89THAVES NW 7TH STN 6TH STS 118TH STWELLSAVESHOUS ER WAY N S 123RDST86TH CTS S123RDPLN MARION STMAIN AVE S TAYLOR AVE NW N 2ND STN 3RD STN 4TH STN 5TH STS 117TH STFACTORY PL N S 121ST STWILLIAMSAVE S LIND AVE N W LOGAN AVE S PELLYAVE N S 119TH STBUR N E T T P L S PARK AVE N L O G A N A V E N MEADO W AVE N NW6THSTWELLS AVE N WILLIAMS AVE NBURNETTAVE N SL A T E R S T S RAINIERAVEN N RIV E R S I D E D R 0+00 5+00 10+00 15+00 20+00 25+00 30+00 35+00 40+00 45+00 50+00 55+00 60+00 10+00 15+00 20+00 25+00 30+00 35+00 40+00 45+00 50+00 55+00 60+00 65+00 Data Source: 2019 image and streets from King County GIS. ESRI.Bank, stationing and improvements from Tetra Tech, August 2019. Cedar River Section 205 Levee SystemImprovement Locations Overview and Vicinity Map Cedar River 205 Levee Certification ProjectRenton, Washington Figure 1 SITE 40 0 40 Feet Notes: 1. The locations of all features shown are approximate.2. This drawing is for information purposes. It is intendedto assist in showing features discussed in an attached document. GeoEngineers, Inc. cannot guarantee the accuracy and contentof electronic files. The master file is stored by GeoEngineers, Inc.and will serve as the official record of this communication. Projection: NAD 1983 HARN StatePlane Washington North FIPS 4601 Feet Legend Bank Stationing Cedar River Levee Alignment Ordinary High Water Mark (OHWM) Vegetation Conservation Buffer Field Investigation Area Improvement Area P:\0\0693078\GIS\MXD\069307800_F02-6_ImprovementLocations.mxd Date Exported: 10/11/21 by ccabrera South Boeing BridgeCedar R i v e r Improve Transition fromLevee Embankment to Wall 40+00 50+00 EagleView Technologies, Inc. Data Source: 2019 image and streets from King County GIS.Bank, stationing and improvements from Tetra Tech, August 2019. Cedar River Section 205 Levee SystemImprovement Locations Cedar River Section 205 Levee SystemRenton, Washington Figure 2 50 0 50 Feet Notes: 1. The locations of all features shown are approximate.2. This drawing is for information purposes. It is intendedto assist in showing features discussed in an attached document. GeoEngineers, Inc. cannot guarantee the accuracy and contentof electronic files. The master file is stored by GeoEngineers, Inc.and will serve as the official record of this communication. Projection: NAD 1983 HARN StatePlane Washington North FIPS 4601 Feet Legend Bank Stationing Cedar River Levee Alignment Ordinary High Water Mark (OHWM) Vegetation Conservation Buffer Field Investigation Area Improvement Area P:\0\0693078\GIS\MXD\069307800_F02-6_ImprovementLocations.mxd Date Exported: 10/11/21 by ccabrera Senior Center Lo g a n A v e n u e B r i d g e Cedar River Raise/RegradeLevee Embankment Widen Levee Crestwith Retaining Wall Construct Floodwall Reconstruct Damaged Floodwall Raise/RegradeLevee Embankment Raise/ExtendExisting WallN 3RD STL O G A N A V E N 65+00 EagleView Technologies, Inc. Data Source: 2019 image and streets from King County GIS.Bank, stationing and improvements from Tetra Tech, August 2019. Cedar River Section 205 Levee SystemImprovement Locations Cedar River Section 205 Levee SystemRenton, Washington Figure 3 20 0 20 Feet Notes: 1. The locations of all features shown are approximate.2. This drawing is for information purposes. It is intendedto assist in showing features discussed in an attached document. GeoEngineers, Inc. cannot guarantee the accuracy and contentof electronic files. The master file is stored by GeoEngineers, Inc.and will serve as the official record of this communication. Projection: NAD 1983 HARN StatePlane Washington North FIPS 4601 Feet Legend Bank Stationing Cedar River Levee Alignment Ordinary High Water Mark (OHWM) Vegetation Conservation Buffer Field Investigation Area Improvement Area P:\0\0693078\GIS\MXD\069307800_F02-6_ImprovementLocations.mxd Date Exported: 10/11/21 by ccabrera Cedar R i v e r Improve Transition fromLevee Embankment to Wall 20+00 EagleView Technologies, Inc. Data Source: 2019 image and streets from King County GIS.Bank, stationing and improvements from Tetra Tech, August 2019. Cedar River Section 205 Levee SystemImprovement Locations Cedar River Section 205 Levee SystemRenton, Washington Figure 4 80 0 80 Feet Notes: 1. The locations of all features shown are approximate.2. This drawing is for information purposes. It is intendedto assist in showing features discussed in an attached document. GeoEngineers, Inc. cannot guarantee the accuracy and contentof electronic files. The master file is stored by GeoEngineers, Inc.and will serve as the official record of this communication. Projection: NAD 1983 HARN StatePlane Washington North FIPS 4601 Feet Legend Bank Stationing Cedar River Levee Alignment Ordinary High Water Mark (OHWM) Vegetation Conservation Buffer Field Investigation Area Improvement Area P:\0\0693078\GIS\MXD\069307800_F02-6_ImprovementLocations.mxd Date Exported: 10/11/21 by ccabrera Cedar R i v e r Raise Floodwall Raise Levee Embankmentwith Curb Wall N 6TH STN RI V E R S I D E D R 25+00 30+00 35+00 40+00 45+00 EagleView Technologies, Inc. Data Source: 2019 image and streets from King County GIS.Bank, stationing and improvements from Tetra Tech, August 2019. Cedar River Section 205 Levee SystemImprovement Locations Cedar River Section 205 Levee SystemRenton, Washington Figure 5 60 0 60 Feet Notes: 1. The locations of all features shown are approximate.2. This drawing is for information purposes. It is intendedto assist in showing features discussed in an attached document. GeoEngineers, Inc. cannot guarantee the accuracy and contentof electronic files. The master file is stored by GeoEngineers, Inc.and will serve as the official record of this communication. Projection: NAD 1983 HARN StatePlane Washington North FIPS 4601 Feet Legend Bank Stationing Cedar River Levee Alignment Ordinary High Water Mark (OHWM) Vegetation Conservation Buffer Field Investigation Area Improvement Area P:\0\0693078\GIS\MXD\069307800_F02-6_ImprovementLocations.mxd Date Exported: 10/11/21 by ccabrera Senior Center Lo g a n A v e n u e B r i d g e Cedar River Raise/RegradeLevee Embankment Widen Levee Crestwith Retaining Wall Construct Floodwall Reconstruct Damaged Floodwall Raise/RegradeLevee Embankment Raise/ExtendExisting Wall NAIRPORT WAYLOGAN AVE S 55+00 60+00 EagleView Technologies, Inc. Data Source: 2019 image and streets from King County GIS.Bank, stationing and improvements from Tetra Tech, August 2019. Cedar River Section 205 Levee SystemImprovement Locations Cedar River Section 205 Levee SystemRenton, Washington Figure 6 APPENDICES APPENDIX A National Wetland Inventory Map Cedar River 205 Levee Improvement Project U.S. Fish and Wildlife Service, National Standards and Support Team,wetlands_team@fws.gov Wetlands Estuarine and Marine Deepwater Estuarine and Marine Wetland Freshwater Emergent Wetland Freshwater Forested/Shrub Wetland Freshwater Pond Lake Other Riverine October 29, 2019 0 0.5 10.25 mi 0 0.8 1.60.4 km 1:2 9,134 This page was produced by the NWI mapperNational Wetlands Inventory (NWI) This map is for general reference only. The US Fish and Wildlife Service is not responsible for the accuracy or currentness of the base data shown on this map. All wetlands related data should be used in accordance with the layer metadata found on the Wetlands Mapper web site. APPENDIX B Soil Survey Map Soil Map—King County Area, Washington Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 10/29/2019 Page 1 of 35259200525940052596005259800526000052602005260400526060052608005261000526120052592005259400525960052598005260000526020052604005260600526080052610005261200558600558800559000559200559400559600559800560000 558600 558800 559000 559200 559400 559600 559800 560000 47° 30' 9'' N 122° 13' 23'' W47° 30' 9'' N122° 12' 4'' W47° 28' 58'' N 122° 13' 23'' W47° 28' 58'' N 122° 12' 4'' WN Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 10N WGS84 0 500 1000 2000 3000 Feet 0 150 300 600 900 Meters Map Scale: 1:10,600 if printed on A portrait (8.5" x 11") sheet. Soil Map may not be valid at this scale. MAP LEGEND MAP INFORMATION Area of Interest (AOI) Area of Interest (AOI) Soils Soil Map Unit Polygons Soil Map Unit Lines Soil Map Unit Points Special Point Features Blowout Borrow Pit Clay Spot Closed Depression Gravel Pit Gravelly Spot Landfill Lava Flow Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot Severely Eroded Spot Sinkhole Slide or Slip Sodic Spot Spoil Area Stony Spot Very Stony Spot Wet Spot Other Special Line Features Water Features Streams and Canals Transportation Rails Interstate Highways US Routes Major Roads Local Roads Background Aerial Photography The soil surveys that comprise your AOI were mapped at 1:24,000. Warning: Soil Map may not be valid at this scale. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Please rely on the bar scale on each map sheet for map measurements. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: Coordinate System: Web Mercator (EPSG:3857) Maps from the Web Soil Survey are based on the Web Mercator projection, which preserves direction and shape but distorts distance and area. A projection that preserves area, such as the Albers equal-area conic projection, should be used if more accurate calculations of distance or area are required. This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Soil Survey Area: King County Area, Washington Survey Area Data: Version 15, Sep 16, 2019 Soil map units are labeled (as space allows) for map scales 1:50,000 or larger. Date(s) aerial images were photographed: Jul 1, 2019—Jul 25, 2019 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Soil Map—King County Area, Washington Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 10/29/2019 Page 2 of 3 Map Unit Legend Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI Ur Urban land 64.3 78.5% W Water 16.9 20.7% Totals for Area of Interest 81.8 100.0% Soil Map—King County Area, Washington Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 10/29/2019 Page 3 of 3 APPENDIX C Site Photographs FigureC-1 Site Photographs Photograph 1. Right Bank, STA 49+60, looking northeast. Photograph 2. Right Bank, STA 49+60, looking southeast. Cedar River 205 Levee Certification Project Renton, Washington 000693-078-01 Date Exported: 10/28/19 FigureC-2 Site Photographs Photograph 3. Right Bank, STA 63+65 to 64+35, looking north Photograph 4. Right Bank, STA 63+65 to 64+35, looking south Cedar River 205 Levee Certification Project Renton, Washington 000693-078-01 Date Exported: 10/28/19 FigureC-3 Site Photographs Photograph 5. Right Bank, STA 66+55 to 67+25, looking east. Senior Center building shown. Photograph 6. Right Bank, STA 66+55 to 67+25, looking west. Senior Center building shown. Cedar River 205 Levee Certification Project Renton, Washington 000693-078-01 Date Exported: 10/28/19 FigureC-4 Site Photographs Photograph 7. Left bank, STA 19+20, looking north. Photograph 8. Left bank, STA 19+20, looking south. Cedar River 205 Levee Certification Project Renton, Washington 000693-078-01 Date Exported: 10/28/19 FigureC-5 Site Photographs Photograph 9. Left Bank, STA 25+45 to 29+70, looking north. Photograph 10. Left Bank, STA 25+45 to 29+70, looking south. Cedar River 205 Levee Certification Project Renton, Washington 000693-078-01 Date Exported: 10/28/19 FigureC-6 Site Photographs Photograph 11. Left Bank, STA 29+70 to 34+10, looking north. Photograph 12. Left Bank, STA 29+70 to 34+10, looking south. Cedar River 205 Levee Certification Project Renton, Washington 000693-078-01 Date Exported: 10/28/19 FigureC-7 Site Photographs Photograph 13. Left Bank, STA 55+70 to 56+90, looking north. Photograph 14. Left Bank, STA 55+70 to 56+90, looking east. Cedar River 205 Levee Certification Project Renton, Washington 000693-078-01 Date Exported: 10/28/19 FigureC-8 Site Photographs Photograph 15. Left Bank, STA 58+10 to 58+50, looking northeast. Photograph 16. Left Bank, STA 58+55 to 59+15, looking west. Cedar River 205 Levee Certification Project Renton, Washington 000693-078-01 Date Exported: 10/28/19 FigureC-9 Site Photographs Photograph 17. Left Bank, STA 58+55 to 59+15, looking southwest. Photograph 18. Left Bank, STA 59+15 to 59+85, looking south. Cedar River 205 Levee Certification Project Renton, Washington 000693-078-01 Date Exported: 10/28/19