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Home My WebLink AboutRS_LakeStudy_190128_v1( r D�1- e ' Altmann Oliver Associates, LLC AOA PO Box 578 C.amation, 41.rk 98014 Office (4`225) 3:,3-4535 Fax (425) 33'"5,09 E N ironmental Planning &-- Landscape Landscape Architecture STANDARD LAKE STUDY REPORT LEIGHTON RESIDENCE 3307 MOUNTAIN VIEW AVE N RENTON, WASEIINGTON Prepared For. Steve Leighton 3307 Mountain View Ave_ N. Renton, WA 98056 December 13, 2018 Table Of Contents Page 1.0 INTRODUCTION 1 2.0 GENERAL PROPERTY DESCRIPTION AND LAND USE 3.0 METHODOLOGY 4.4 RESULTS 2 5.0 HABITAT ASSESSMENT 6 6.0 PROPOSED PROJECT 6 List of Attachments Figure 1: Aerial Photo Attachment 1: Original Site Survey by Eastside Consultants Attachment 2: Armory Plan Provided by Owner Attachment 3: Proposed House Expansion Provided by Owner Attachment 4: Original Planting Plan prepared by eccosDesign LEIGHTON RESIDENCE RENTON, WASHINGTON STANDARD LAKE STUDY REPORT December 13, 2018 1.0 INTRODUCTION This report is the result of a lake study on a 0.77 -acre site located on Lake Washington in the City of Renton, Washington. The proposed project would be constructed in two phases. Phase one consists of additional armoring of the existing rock bulkhead and Phase 2 will consist of a small (498 s.f.) addition to the existing residence. The purpose of this report is to describe the shoreline habitat on the property and to evaluate proposed impacts and mitigation associated with the project. Information in this report is intended to satisfy the general reporting requirements of RMC 4-8-120D for standard lake studies. 2.0 GENERAL PROPERTY DESCRIPTION AND LAND USE The site consists of tax parcel 312405-9077 located at 3307 Mountain View Ave N. in the City of Renton, Washington. It is found within Section 31, Township 24 North, Range 5 East, W.M. The property consists of a long narrow lot situated between the Burlington Northern Railroad to the east and Lake Washington to the west (Figure 1). The site is currently developed with a single-family residence, several associated out -buildings, and a large paved parking/driveway. Vegetation on the site consists almost entirely of maintained yard. Significant trees are generally limited to a row of trees along the east property line and widely scattered ornamentals. The shoreline along the site is entirely developed with a rock and concrete bulkhead. The area below the bulkhead consisted of gravelly sand with some cobble. 3.0 METHODOLOGY On April 23, 20131 conducted an initial wetland reconnaissance on the subject property utilizing the methodology outlined in the May 2010 Regional Supplement to the Corps of Engineers Wetland Delineation Manual. Western Mountains, Valleys, and Coast Region (Version 2.0). The ordinary high water (OHW) of Lake Washington was delineated during the field investigation. No wetlands were identified on the site during the initial reconnaissance. On December 6, 20181 conducted a site review of the property and confirmed that conditions on the property had not significantly changed Leighton Residence December 13, 2018 4.0 RESULTS The project site is located on Lake Washington, a Shoreline of Statewide Significance per RMC 4-3-090.B.1.a. The site is located within the Single -Family Residential Overlay District per 4-3-090.C.3. The City of Renton requires a standard 100 -foot structure setback from the OHW of the lake per Table 4-3-090.D.7.a. Vegetation on the site consisted primarily of maintained yard with scattered ornamental plantings interspersed with patches of mowed grasses and low weeds such as dandelion (Taraxacum ofiicinale). In addition, a row of periodically pruned cherry (Prunus sp.) and big -leaf maple (Acer macrophyilum) trees were observed along the east property line adjacent the railroad right-of-way (see original survey drawing conducted as part of previous short plat application — Attachment 1). Understory vegetation along the east property line included snowberry (Symphoricarpos albus), Indian plum (Oemleria cerasiformis), holly (flex sp.), Himalayan blackberry (Ru,bus armeniacus), and sword fern (Polystichum munitum). The project site currently contains about 12,164 s.f. of impervious surfaces, of which about 4,780 s_f. is considered pollution generating impervious surface. Due to the amount of this impervious surface and lack of significant vegetation along the shoreline, the functions provided by the existing buffer are severely limited. Furthermore, it is our understanding that there is currently no water quality treatment provided to any runoff entering the lake from the existing development. Leighton Residence 2 December 13, 2018 Photo 2. View looking north of northern portion of shoreline_ Leighton Residence December 13, 2018 r� Photo 5. View of existing parking along south side of residence. 5.0 HABITAT ASSESSMENT As part of the lake study, the WA Department of Fish and Wildlife's Priority Habitats and Species (PHS) database was reviewed. This database did not indicate the presence of any non -salmonid threatened, endangered, sensitive, monitored, or priority habitats or species on or adjacent to the property. While the site does likely provide some relatively minor habitat for a variety of birds and small mammals typically found within suburban environments, no threatened, endangered, sensitive, monitored, or priority species were identified on the site during the field investigations. As defined in RMC 4-11-030.0, Critical Habitat is an area associated with threatened, endangered, sensitive, monitored, or priority species of plants or wildlife and which, if altered, could reduce the likelihood that the species would maintain and reproduce over the long term. Since no critical habitat for non - salmonid species has been identified on the site, no specific Habitat Data Report is required. 6.0 PROPOSED PROJECT Phase 1 of the proposed project consists of providing additional armoring to the existing concrete and rock bulkhead. Based on the site plan and construction bid provided to us from the owner (Attachment 2), it is my understanding that no work would be constructed below the ordinary high water of the fake and that no significant native vegetation would be removed as part of this project. Leighton Residence 5 December 13, 2018 Phase 2 of the proposed project consists of a future 498 s.f. addition to the southern portion of the house. Attachment 3 includes a preliminary site plan for the area of the addition that was provided to us by the owner. This area currently consists primarily of the existing concrete parking pad. No Net Loss of Ecological Functions The City of Renton requires that any re -development of the shoreline not result in a loss of ecological function. Since the existing shoreline is highly developed and does not contain an intact plant community, the current functions provided by the buffer are minimal. Neither Phase 1 nor Phase 2 will require the removal of significant vegetation and since no work would occur below the ordinary high water of the lake, these actions are not anticipated to have a significant impact on the existing buffer functions. Although there should be no significant loss of function from the proposed project, a planting plan was prepared by eccosDesign for the original short plat application to increase the functions of the buffer immediately adjacent the shoreline (Attachment 4). It is my understanding that the enhancement plan was designed to increase the habitat value of the buffer by increasing the plant species and structural diversity adjacent the shoreline over existing conditions. It is also my understanding that although the planting plan was designed for the original short plat application, an updated planting plan will be installed following installation of the additional armoring and the house expansion. Native vegetation should be planted directly adjacent the re -armored bulkhead to provide habitat and contribute detritus and other desirable allochthonous inputs into the lake. Implementation of the planting plan should increase the buffer functions over current conditions and would therefore result in a no -net loss of ecological function. As required by the City of Renton, the installed planting plan should be monitored per an approved vegetation management plan. Leighton Residence 6 December 13, 2018 RECQRpENC NO. C17Y OF F?FNTON LORD/LEIGHTON PREIUMINARY SHORT S.P. No. ------------- I PLAT —� SEC. 31, TWA 24N. RGE 5E W.M. V(k_/PACE LLA-ra- LNI)- a:c�iAir- stcv[ �rxr..e L AM SUAVEWR1i R7M awsrsrc rern,,er5,�a we s1Y e. sI'�0u.'°rux, u semi (<ze) asz-ami Sff AMR= uv .¢w e� xun+>• raNid. w seas runs �zwsssn x.i..rrnnos ann GRAPHIC SCALE F� (m Yplr 7 S irch >• W A HASPS OF BEARFKG: fPLD tlG ]NE AUWr OF Ka•49'SA'£ ON In EAST YJN6 OF THR WUTHEAS QUARM OF S -014W AS SFOIIN ON THAT R ORD OF SVAVE'e MW 7N m X 04 M PAGE 262 VER77CAL DATUM (KAYO M) rlmcx tacaruw� sP wv� 4� sPYNp 4® Acc'®Y� a DY ppvtY 23 a' uaw,{ �� . 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