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HomeMy WebLinkAboutRS_Wetland_and_Stream_Assessment_161228_v1 December 28, 2016 AOA-5136 Jill Routt Goldsmith Land Development Services 1215 – 114th Ave. SE Bellevue, WA 98004 SUBJECT: Standard Stream Study for Rhododendron Ridge Storm Extension City of Renton, WA File No. PRE 16-000137 Dear Jill: 1.0 INTRODUCTION This report is the result of a wetland and stream reconnaissance conducted along the route of a proposed storm line from the Rhododendron Ridge Short Plat located at 11230 SE 80th Street within the City of Newcastle. This storm line would be constructed within the SE 80th right-of-way and would direct treated stormwater runoff from the subdivision to a public stormwater system owned by the City of Renton located within the right-of-way of Lincoln Avenue NE. 2.0 GENERAL PROPERTY DESCRIPTION AND LAND USE The SE 80th Street right-of-way in the vicinity of the proposed storm extension is currently unimproved except for a sanitary sewer line that traverses the entire right- of-way. The right-of-way slopes moderately to steeply down from east to west and consists of mixed upland forest interspersed with areas of mowed lawn. 3.0 METHODOLOGY Prior to conducting the site reconnaissance the following mapping systems were reviewed:  Washington Department of Fish and Wildlife’s Salmonscape  Washington Department of Natural Resources’ FPARS mapping  Washington Department of Fish and Wildlife’s Priority Habitats and Species Mapping  City of Renton critical area mapping  King County iMAP Jill Routt December 28, 2016 Page 2 On May 25, 2016 I conducted a wetland and stream 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). 4.0 RESULTS None of the critical area maps reviewed indicated any wetlands or streams located on the subject property. The City of Renton critical area mapping does indicate a Type F stream and wetland located off-site to the south. At the time of the field investigation, the site consisted mostly of a mixed upland forest that slopes moderately to steeply down from east to west. Vegetation included a canopy of big-leaf maple (Acer macrophyllum), black cottonwood (Populus trichocarpa), Douglas fir (Pseudotsuga menziesii, western red cedar (Thuja plicata), and red alder (Alnus rubra). Commonly observed understory and groundcover species included hazelnut (Corylus cornuta), salal (Gaultheria shallon), tall Oregongrape (Mahonia aquifolium), Himalayan blackberry (Rubus armeniacus), sword fern (Polystichum munitum), bracken fern (Pteridium aquilinum), English ivy (Hedera helix), Indian plum (Oemleria cerasiformis), snowberry (Symphoricarpos albus), and trailing blackberry (Rubus ursinus). The southwestern portion of the site consisted of a mowed and maintained lawn associated with the off-site residence to the south. In addition, a mowed corridor of grasses extends up the slope within the right-of-way adjacent the existing sanitary sewer line. No hydrophytic plant communities were observed on or immediately adjacent to the site during the reconnaissance. Borings taken throughout and adjacent the undisturbed portions of the site revealed high chroma, non-hydric soils and there was no evidence of ponding or prolonged soil saturation. Soils within the immediate vicinity of the sanitary sewer line were highly disturbed and likely consist of relic back-fill placed during historic installation of the sewer line. 4.1 Off-site Stream One stream was observed off-site to the southwest. The stream within the closest proximity to the site is located within a ditched channel along the north side of the driveway to the existing residence at 4348 Lincoln Ave. NE. Runoff within the stream enters a non-fish passable concrete culvert under Lincoln Ave NE. Although the stream does not currently appear to support salmonids, it is my understanding that the City of Renton has classified this stream as a Type F channel due to the streams potential for fish use. Type F streams require a standard 115-foot buffer per RMC 4-3-050.G.2. This buffer extends into the southwest portion of the SE 80th Street right-of-way. Jill Routt December 28, 2016 Page 3 4.2 Mapped Off-site Wetland The potential off-site wetland to the south as mapped on the City mapping system was not observed and appears to be mis-mapped. This mis-mapping is consistent with a wetland and stream reconnaissance I recently conducted on Parcel 334570- 0020 located further off-site in which the same mapped stream was observed but there was no large wetland system on the parcel as depicted on the City mapping. 5.0 HABITAT ASSESSMENT The Washington Department of Fish and Wildlife’s Priority Habitats and Species (PHS) database does not indicate the presence of any threatened, endangered, sensitive, monitored, or priority habitats or species on or adjacent to the property. While the site does likely provide habitat for a variety of wildlife species typically found within suburban environments, no threatened, endangered, sensitive, monitored, or priority species were identified on or adjacent to the site during the field investigations. As defined in RMC 4-11-030.C, 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 has been identified on the site, no Habitat Data Report is required. 6.0 PROPOSED PROJECT IPACTS The proposed storm line has been designed to avoid all direct impacts to critical areas. To further minimize impacts to wildlife and significant vegetation, the pipe would be installed within the existing maintained areas. Although crossing the buffer from the off-site stream in the southwestern corner of the property is unavoidable, the storm line would be installed within the mowed lawn portion of the right-of-way and would therefore not require the removal of any significant buffer vegetation (Figure 1). All of the temporary disturbance within the buffer will be fully restored by seeding with native grass following installation of the storm line. Jill Routt December 28, 2016 Page 4 If you have any questions, please give me a call. Sincerely, ALTMANN OLIVER ASSOCIATES, LLC John Altmann Ecologist 15 12335 SF SSSSSSSSSSS SXX SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSW SDSDSDWWWW W EEOHU OHU OHU OHU OHU SD SD W SDS S S S S S W W W DS X XXXXX X X XXXXXXWWWWWWWW 30' ROW 15 12335 SF SSSSSSSSSSS SXX SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSW SDSDSDWWWW W EEOHU OHU OHU OHU OHU SD SD W SDS S S S S S W W W DS X XXXXX X X XXXXXXWWWWWWWW 50352 50358 50359 50360 50361 50366 50367 50368 50369 50370 50371 50373 50379 50380 50384 50404PROJECT DRAWNDATESCALEREVISEDLandscapeArchitectureAOAEnvironmentalPlanning &Office (425) 333-4535PO Box 578Carnation, WA 98014Fax (425) 333-4509Altmann Oliver Associates, LLC5136-MIT-12-14-16.dwg Rhod od end ro n Rid ge Storm Exte nsio n Source s: Esri, HERE, De Lo rme , Int erma p, in crement P Corp., GEB CO ,US GS, FA O, NPS, NRCA N, Ge oB ase , I GN, K adaste r NL, Ordn an ce Survey,Esri Ja pa n, ME TI , Esri China (Hong Ko ng ), swisst opo , Map myI ndia , ©Ope nSt re etM ap co ntributors, and the GI S User Co mmun ityWDFW All Salmo nScap e Species De ce mbe r 28, 20 16 0 0.1 5 0.30.075 mi 0 0.2 0.40.1 km 1:9,02 8 12/28/2016 Forest Practices Application Mapping Tool (FPAMT) https://fortress.wa.gov/dnr/protectiongis/fpamt/1/1 DNR Home (http://www.dnr.wa.gov/)FPARS Home (http://www.dnr.wa.gov/programs­and­services/forest­practices/forest­practices­application­review­system­fpars) Practices (http://www.dnr.wa.gov/programs­and­services/forest­practices)FP Rules (http://www.dnr.wa.gov/about/boards­and­councils/forest­practices­board/forest­practices­rules­ and­board­manual­guidelines)FP Manual (http://www.dnr.wa.gov/about/boards­and­councils/forest­practices­board/rules­and­guidelines/forest­practices­board­manual)Township      1:18,056 Esri, HERE, DeLorme, NGA, USGS, NPS + – 0 0.1 0.2mi   Map Themes  Activity Map Townships  Section Survey Lines  Map Registration Tics  Water Type Break  Roads  Trails and Railroads  Watershed Analysis  Search for Layers   Data Active (17)Legend WDFW Test Map Sou rces: E sri, HE RE , DeL orme, USG S, I nterm ap , INCREMENT P, NRCan ,Esri Japan, ME TI, E sri Ch ina (Hong K on g), E sri K orea, Esri (Thaila nd), PH S Re po rt C lip Ar ea PT LN PO LY AS MAPPED SECTION QTR -TW P TO WN SH IP De ce mbe r 28 , 20 16 0 0.3 0.60.15 mi 0 0.55 1.10.275 km 1:19,8 42 SITE King C ou n ty Rho dodendr on Rid ge Sto rm Exte n sion Date: 1 2 /2 8 /2 016 Notes: ±Th e infor matio n in clu de d on t his map has been comp ile d b y Kin g Count y staf f from a variety of source s an d is su bject to cha ng ewithout n otice. Kin g Co unt y makes no re present ations o r wa rra nties, exp re ss o r im plied , a s to accu ra cy, complet en ess, t ime lin ess,or rig hts to the use of such informa tion . This d ocu me nt is not intended for u se as a survey pr od uct. King Cou nty shall n ot be lia blefor a ny g en er al, sp ecial, indirect, incide ntal, o r conse qu en tial damag es including , but not limited to , lost revenu es or lo st profitsresulting from th e use or m isu se of t he info rmat ion cont aine d on this map . An y sale of this map or in formation o n t his map isprohibited except by written p er mission of King County. 2,257 188 City of Renton Print map Template This map is a user generated static output from an Internet mapping site and is for reference only. Data layers that appear on this map may or may not be accurate, current, or otherwise reliable. None 4/22/2016 Legend 128064 THIS MAP IS NOT TO BE USED FOR NAVIGATION Feet Notes 128 WGS_1984_Web_Mercator_Auxiliary_Sphere Information Technology - GIS RentonMapSupport@Rentonwa.gov City and County Boundary Other City of Renton Addresses Parcels Environment Designations Natural Shoreline High Intensity Shoreline Isolated High Intensity Shoreline Residential Urban Conservancy Jurisdictions Streams (Classified) Type S Type F Type Np Type Ns Wetlands