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HomeMy WebLinkAboutRS_Lake Study_191010_v1.pdf LAKE STUDY FOR Albertson Addition 3619 Lake Washington Boulevard North City of Renton, WA Wetland Resources, Inc. Project #19178 Prepared By Wetland Resources, Inc. 9505 19th Avenue SE, Suite 106 Everett, WA 98208 (425) 337-3174 Prepared For Lyman Architects Attn: Brian Lyman 4235 SE Mile Hill Drive, #D Port Orchard, WA 98366 September 19, 2019 Lake Study WRI Project #19178 Albertson Residential Addition September 19, 2019 ii TABLE OF CONTENTS 1.0 PROPOSED PROJECT .............................................................................................................. 1 1.1 PROJECT LOCATION ..................................................................................................................... 1 1.2 LANDSCAPE SETTING .................................................................................................................... 1 1.3 SITE DESCRIPTION ........................................................................................................................ 2 1.4 PROJECT DESCRIPTION ................................................................................................................. 3 2.0 LAKE STUDY ......................................................................................................................... 4 2.1 ASSESSMENT METHODOLOGY ...................................................................................................... 4 WITHIN LAKE WASHINGTON, THE FOLLOWING SPECIES ARE DEPICTED: ..................................... 4 3.0 SHORELINE MITIGATION PLAN (LAKE STUDY, SUPPLEMENTAL) ............................................ 5 3.1 ALTERNATIVES ANALYSIS ............................................................................................................. 6 3.2 IMPACT EVALUATION ................................................................................................................... 6 4.0 USE OF THIS REPORT ........................................................................................................... 7 5.0 REFERENCES ......................................................................................................................... 8 Appendices Appendix A: Lake Study Map Lake Study WRI Project #19178 Albertson Residential Addition September 19, 2019 iii (this page intentionally left blank) 1.0 PROPOSED PROJECT 1.1 PROJECT LOCATION The project occurs on King County Tax Parcel 3342700290. This is a .091-acre parcel, located at 3619 Lake Washington Boulevard North in the City of Renton. Access to the property is from the east via Lake Washington Boulevard North. The Public Land Survey System Locator is Section 31, Township 24N, Range 5E, WM. Site-Scale Vicinity Map 1.2 LANDSCAPE SETTING Basin: Puget Sound Sub-Basin: Water Resource Inventory Area (WRIA) 8 – Cedar River/Renton River Watershed: Lake Washington Watershed Lake Study WRI Project #19178 Albertson Residential Addition September 19, 2019 2 Landscape-Scale Vicinity Map (Google Earth) The study area is located on the east shore of Lake Washington, the second largest natural lake in Washington State with a total surface area of over 22,000 acres. The lake is approximately 20 miles in total length, with an average width of 1.5 miles (Kerwin, 2001). Lake Washington is highly developed along much of the approximately 50 miles of lake shoreline. 1.3 SITE DESCRIPTION The subject property is immediately surrounded to the north and south by residential development, to the east by Lake Washington Boulevard North and to the west by Lake Washington. An existing house, carport, courtyard and patio pad cover the entirety of the subject property. Between the house and the shoreline of the lake, the backyard is covered entirely by impervious surfaces. No vegetated areas are located within the boundary of the site. Development along the lake’s shoreline is limited to the existing bulkhead and back patio. The face of the bulkhead clearly defines the ordinary high water mark (OHWM) of Lake Washington. No Lake Study WRI Project #19178 Albertson Residential Addition September 19, 2019 3 vegetation is present waterward of the OHWM and no aquatic vegetation or lake-fringe wetlands were observed. Beach substrate consists of sorted large cobble/concrete pieces on a moderate grade. This is consistent with a high-energy shoreline. No other habitat features were observed on or in the vicinity of the subject property. Bing Maps Bird’s Eye View 1.4 PROJECT DESCRIPTION The applicant proposes replace the existing structure in its existing footprint with the exception of a small expansion in the brick courtyard area. This proposal will bring the structure into compliance with existing building codes and provide for greater health and safety of the residents. There will be no increase in impervious surfaces or impact as a result of this development proposal. No structures will be added closer to the shoreline of the lake and the existing overwater structures (dock) will remain. Given no vegetation removal will occur, impervious surfaces will not increase and improvement will be behind (landward) of the existing primary structure, no net loss of shoreline ecological function will occur. The City of Renton’s Shoreline Master Program (SMP) requires applicant proposing shoreline modifications on existing legal lots to provide a Stream or Lake Study that meets the requirements of RMC 4-8-120D.19. SITE Lake Study WRI Project #19178 Albertson Residential Addition September 19, 2019 4 2.0 LAKE STUDY 2.1 ASSESSMENT METHODOLOGY 2.1.1 Field Investigation Principal Ecologist Scott Brainard, PWS, conducted a site investigation on July 31, 2019. 2.1.2 Limit of Study The proposed project occurs on tax parcel (tax ID number 3342700290). Lack of legal access to adjacent parcels prevents Wetland Resources, Inc. (WRI) staff from performing detailed investigation in surrounding areas. Therefore, this investigation involved a site visit to the subject property and evaluation of existing on-line information, include the USFWS National Wetlands Inventory (NWI), USDA/NRCS Web Soil Survey, WDFW SalmonScape Interactive Map, WDFW Priority Habitat and Species (PHS) Interactive Map, and King County iMap. 2.1.3 Lake Assessment Narrative Lake Washington, a Type S water, is the only aquatic critical area located on and near the subject property. With the exception of potted plant material, the subject property lacks all vegetation. Generally, the surface area of the site is dominated by the house, carport, driveway and patio features. 2.1.4 Ecological Functions The cement bulkhead deflects wave energy, which can cause erosion that leads to deeper water along the shoreline. High-energy/deep water shorelines do not provide refuge opportunities for migrating fish. Bulkheads also prevent establishment of riparian vegetation, which provides cover and forage opportunities for juvenile salmon. The absence of overhanging vegetation limits the ecological value for migrating fish. The existing impervious surface also limits the establishment of native vegetation, reducing the overall ecological value of this shoreline. Due to the mostly high-energy shoreline, lack of riparian vegetation, and presence of impervious surface to the top of the bulkhead, shoreline ecological functions are limited within the subject property. Fish and Wildlife No fish or wildlife species were directly observed at the time of investigation. The Washington Department of Fish and Wildlife (WDFW), Pacific States Marine Fisheries Commission (PSMFC), and the Washington Dept. of Natural Resources (WADNR) are the primary agencies that provide publicly available information used for making fish presence determinations consistent with the water typing rules set forth in WAC 222-16-030. The following information represents the findings from each source. WDFW SalmonScape Map Tool SalmonScape is an online GIS database that contains publicly available resource information for fish population studies and general species distribution (both documented and modeled presence). Within Lake Washington, the following species are depicted: • fall Chinook (documented presence), • coho (documented presence), • winter steelhead (documented presence), Lake Study WRI Project #19178 Albertson Residential Addition September 19, 2019 5 • sockeye salmon (documented presence), • bull trout (documented rearing), • kokanee (documented presence) PSMFC StreamNet Map Tool StreamNet is a fish distribution database maintained by the PSMFC as a regional clearinghouse for fish data. In the vicinity of the project area, fish presence is only depicted within Lake Washington. StreamNet states the presence of the following species: • fall Chinook (migration only) • coho (migration only) • sockeye salmon (migration only) • winter steelhead (migration only) • bull trout (migration only) WDNR Forest Practices Activity Mapping Tool (FPAMT) FPAMT is an online GIS database that aids the process of submitting a Forest Practices permit application. The tool is useful for the purposes of this study because WADNR models fish presence. FPAMT depicts Lake Washington as a fish-bearing shoreline of the state. No other features are noted in the vicinity of the project. WDFW Priority Habitat and Species (PHS) Maps No terrestrial priority habitats are listed on or near the site. Aquatic priority habitats for the above listed species are noted on the PHS maps. Measures to Protect Trees No significant trees are currently located within the boundary of the subject property and therefore no protection measures are proposed. No Net Loss of Shoreline Ecological Function The existing development along the shoreline provides limited ecological value due to its developed and maintained condition. The applicant proposes to rebuild the existing structure over the top of existing impervious surface and within an existing courtyard. Given the location of the improvement, construction is not expected to cause any temporary or permanent impacts to ecological function. Given the lack of shoreline function currently provided by the existing lot and ecologically isolated location of the improvement, not net loss of shoreline ecological function is expected. 3.0 SHORELINE MITIGATION PLAN (LAKE STUDY, SUPPLEMENTAL) The applicant is proposing to maintain the footprint of the existing structure and no increase the degree of impact or the amount of impervious surfaces. Therefore, no mitigation is proposed as part of this project. SMC 25.06.020(1) requires that mitigation for environmental impacts be applied in the following order. The applicant’s response immediately follows each sequencing principle (as indented, italicized text). Lake Study WRI Project #19178 Albertson Residential Addition September 19, 2019 6 3.1 ALTERNATIVES ANALYSIS Avoidance Avoiding the impact altogether by not taking a certain action or parts of an action; The applicant is proposing to reconstruct the existing house that is located no closer to the lake than the existing primary structure. This work will be entirely constructed over the top of existing impervious surface and will not involve removing any vegetation, or temporary or permanent impacts. This is the only feasible location for the improvement since it involves building over the existing structure on a small waterfront lot. Minimization Minimizing impacts by limiting the degree or magnitude of the action and its implementation by using appropriate technology or by taking affirmative steps to avoid or reduce impacts; Impact minimization will be achieved in the following ways: • The house has been designed to be built over the existing footprint and will be not closer to the lake; • BMPs will be implemented and the existing structure will minimize the potential for sedimentation to the lake; and • Materials selection does not include wood treated with toxic compounds. Rectification Rectifying the impact by repairing, rehabilitating, or restoring the affected environment; The affected environment in this case is buffer zone that is entirely covered with impervious surfaces. Rectification is not practical for this project because repair, rehabilitation, and restoration could only be achieved by, for example, removing existing house. No opportunities for rectification are known to exist for this project. Reduction Reducing or eliminating the impact over time by preservation and maintenance; The proposed structure will be regularly maintained and preserved by the Homeowner, to reduce the frequency of short-term impacts associated with repair/replacement actions. Compensation Compensating for the impact by replacing, enhancing, or providing substitute resources or environment; Mitigation is not proposed for this application because this is a like for like activity. The existing impervious surface courtyard will be replaced with an impervious surface building. Not increase in impervious surfaces or impact will occur from this proposed development activity 3.2 IMPACT EVALUATION (a) Identification, by characteristics and quantity, of the resources (stream, lake) and corresponding functional values found on the site; Lake Washington, a Type S water is the only critical area located on the site. Given the existing developed nature of the subject property, the ecological function provided by the on-site buffer is limited (refer to ecological function section of this report). (b) Evaluation of alternative locations, design modifications, or alternative methods of development to determine which option(s) reduce(s) the impacts on the identified resource(s) and functional values of the site; Lake Study WRI Project #19178 Albertson Residential Addition September 19, 2019 7 Given that this is a narrow waterfront single-family lot, alternative locations for the proposed reconstruction are not feasible. If the proposed addition location were modified, it’s likely that the overall impervious surfaces and impact would be similar. (c) Determination of the alternative that best meets the applicable approval criteria and identify significant detrimental impacts that are unavoidable; Given that the entirety of the site is currently developed and covered with impervious surfaces, no detrimental impacts will occur from this proposal. (d) Evaluation of the cumulative impacts on the system, to the extent that the site resources and functional values are part of a larger natural system such as a watershed; No cumulative impacts will occur from this project as there will be no net loss of shoreline ecological function. (e) Evaluation, for shorelines regulated by RMC 4-3-090, of how the preferred alternative achieves the standard of no net loss of ecological functions under RMC 4-3-090D2; No net loss of shoreline ecologist function will occur as part of this proposal. (f) Evaluation of each of the mitigation plan criteria found in RMC 4-3-050K1, Mitigation Plan Required. No mitigation is proposed since no impact will occur and there is no feasible location to implement mitigation on this site. 4.0 USE OF THIS REPORT This Lake Study is supplied to Lyman Architects as a means of determining the presence of critical habitat, as required by the City of Renton during the permitting process. This report is based largely on readily observable conditions and, to a lesser extent, on readily ascertainable conditions. No attempt has been made to determine hidden or concealed conditions. The laws applicable to salmonid habitat are subject to varying interpretations and may be changed at any time by the courts or legislative bodies. This report is intended to provide information deemed relevant in the applicant's attempt to comply with the laws now in effect. The work for this report has conformed to the standard of care employed by ecologists. No other representation or warranty is made concerning the work or this report and any implied representation or warranty is disclaimed. Wetland Resources, Inc. Scott Brainard, PWS Principal Ecologist Lake Study WRI Project #19178 Albertson Residential Addition September 19, 2019 8 5.0 REFERENCES Kerwin, J. 2001. Salmon and Steelhead Habitat Limiting Factors Report for the Cedar – Renton Basin (Water Resource Inventory Area 8). Washington Conservation Commission. Olympia, WA. http://www.pugetsoundnearshore.org/supporting_documents/WRIA_8_LFR_FINAL.pdf. Accessed December 2016. NOAA National Weather Service Forecast Office, Seattle, Washington. http://www.weather.gov/climate/index.php?wfo=sew. Accessed December 2016. Olson, P. and E. Stockdale. 2010. Determining the Ordinary High Water Mark on Streams in Washington State. Second Review Draft. Washington State Department of Ecology, Shorelands and Environmental Assistance Program. Lacey, WA. Ecology Publication # 08-06-001. StreamNet. 2016. StreamNet Mapper. http://www.streamnet.org/mapping_apps.cfm. Accessed December 2016. U.S. Fish and Wildlife Service. National Wetland Inventory (NWI). Wetlands Mapper. http://www.fws.gov/wetlands/. Accessed December 2016. Washington State Department of Fish and Wildlife (WDFW). 2016. Priority Habitats and Species: PHS on the Web. (http://wdfw.wa.gov/mapping/phs/). Accessed December 2016. Washington State Department of Fish and Wildlife (WDFW). 2016. SalmonScape. (http://wdfw.wa.gov/mapping/salmonscape/index.html). Accessed December 2016. Delineation / Mitigation / Restoration / Habitat Creation / Permit Assistance 9505 19th Avenue S.E. Suite 106 Everett ,Washington 98208 Phone: (425) 337-3174 Fax: (425) 337-3045 Email: mailbox@wetlandresources .com 9/19/2019 Alberstson Residence Addition Lyman Architects Attn. Brian Lyman 4235 SE Mile Hill Drive, Suite D Port Orchard, WA 98366 City of Renton Lake Study Map Drawn by: EC Project #: 19178 Sheet 1/1 LAKE STUDY MAP Albertson Residence Addition Portion of Section 31, Township 24N, Range 5E, W.M. LEGEND PP G G G G GG22241822323426 28282624222 6 283222 24262820302 0 303 0GGG G ONE AND A HALF STORY HOUSE RH = 44.5' FF = 28.01' FF BASEMENT = 20.15' 45.2'1.4'10.0'16.6'11.9'12.9'18.3'6.3'5.9'1.3' 1.3' 22.2'10.4'20.1'10.4'20.1' DOCK N89°28'05"E 102.81'4.84.8'1.53.2'5.01.1'5.0EX. HOUSE PARCEL NO. 334270-0300 EX. House PARCEL NO. 334270-0280 S89°28'05"W 96.00'S18°21'45"W42.28'14.3' 14.3'16.3'16.3'5.9'14.9' 17.2'13.4'17.8'10.1'11.7'6.6' 5.7'1.2'OHWM OF LAKE WASHINGTON TYPE SWATER FLOW EXISTING BUILDING FOOTPRINT TO REMAIN NEW BUILDING FOOTPRINT TO INFILL EXISTING BUILDING FOOTPRINT TO BE REMOVED EXISTING ASPHALT PRIVATE DRIVE EXISTING CONC ASPHALT PADS AND PATIOS EXISTING PAVER LAKEFRONT PATIO TO REMAIN ORDINARY HIGH WATER MARK PROPERTY LINE (SURVEYED) PROPERTY LINE (APPROXIMATED) EX. DOCK Scale 1" = 10' 105 15 200LAKE WASHINGTONBOULEVARD(SITE ACCESS)