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Home My WebLink About7097 stream delineation 053123 May 31, 2023 AOA-7097 Henry Doan henrydoanb@gmail.com SUBJECT: Stream Study for 1409 Union Ave NE, Renton, WA Parcel 042305-9181 (CODE23-000085) Dear Henry: On April 5, 2023 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). Although no wetlands were identified on or adjacent to the site, one stream (Stream 1) was observed flowing from southeast to northwest through the southwest corner of the property. The ordinary high water (OHW) of the stream was delineated during the field investigation and subsequently surveyed (Figure 1). Stream 1 Stream 1 is a tributary to May Creek and has been classified as a Type Np stream by the City of Renton (Attachment A). Type Np streams require a standard 75-foot buffer plus additional 15-foot structure setback per RMC 4-3-050.G.2. The riparian corridor on the site is highly degraded and consisted primarily of recently installed parking with bare ground . Two large cut Douglas fir (Pseudotsuga menziesii) snags and a large weeping willow (Salix babylonica) were also observed. The City of Renton allows the reduction of the standard 75-foot degraded buffer for a Type Np stream down to a maximum reduced buffer of 60 feet with the implementation of a buffer enhancement plan per RMC 4-3-050.I.1. However, even with a the 60-foot reduced buffer, most of the recently installed asphalt parking to the west of the existing structure would still be located within the buffer. Recommendation Based on the tree canopy to the west of the structure it is difficult to tell from aerial photos what the condition of the riparian corridor was prior to the recent parking pavement. If available, photographs of the area prior to paving should be provided. Since new parking pavement is not an allowed alteration within the stream buffer, if definitive proof cannot be provided that the area was already paved then it will likely be necessary to remove the pavement within 60 feet of the stream to the west of the existing structure and prepare a Henry Doan May 31, 2023 Page 2 of 3 buffer restoration planting plan. It appears the parking to the east of the structure has historically been present. Typical view of existing stream buffer on-site. It is my recommendation that confirmation regarding the removal of the existing pavement within the buffer to the west of the structure is required by the City of Renton. If so, please let me know and we can prepare the required restoration planting plan. Henry Doan May 31, 2023 Page 3 of 3 If you have any questions, please give me a call. Sincerely, ALTMANN OLIVER ASSOCIATES, LLC John Altmann Ecologist Attachments King C oun ty, Eag le Vie w King C ou nty iMap Date: 5 /31 /20 23 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.± 1631.11'N 00°59'10" E364.27'UNION AVE. N.E.(132ND AVE. S.E.)N 88°18'20" W120.00'S 00°59'10" WN 88°18'20" W120.00'85.00'N 00°59'10" E85.00'8' - 10' TALL CEDAR HEDGE EXISTING SINGLESTORY BUILDING1-11-21-31-41-51-1DENOTES ORDINARY HIGH WATER MARKFLAG LOCATED BY THIS SURVEYEXISTING CREEK386.03'383.78'381.02'380.06'380.69'ELEV.6' CHAIN LINK FENCEGATE2' CHAIN LINK FENCENEW ASPHALT PARKING AREAPARKING AREANEW ASPHALT CHAIN LINKGATE30" FIR TALL STUMP24" FIR TALL STUMP30" WEEPINGWILLOWWILLOW40" WEEPING24" ALDERF.F. = 386.00' +/-CREEK ORDINARY HIGH WATER MARKAS FLAGGEDSOUTHERLY SIDE OF CREEKGRAPHIC PURPOSES ONLY(NOT SURVEYED)6' CHAIN LINK FENCE6' CHAIN LINK FENCE6' CHAIN LINK FENCEPROJECTDRAWNDATESCALEREVISEDLandscapeArchitectureAOAEnvironmentalPlanning &Office (425) 333-4535PO Box 578Carnation, WA 98014Fax (425) 333-4509Altmann Oliver Associates, LLC7097-MIT-04-21-23.dwg 1,128 94 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 4/7/2023 Legend 64032 THIS MAP IS NOT TO BE USED FOR NAVIGATION Feet Notes 64 WGS_1984_Web_Mercator_Auxiliary_Sphere Information Technology - GIS RentonMapSupport@Rentonwa.gov City and County Labels Addresses Parcels City and County Boundary <all other values> Renton Environment Designations Natural Shoreline High Intensity Shoreline Isolated High Intensity Shoreline Residential Urban Conservancy Jurisdictions Streams (Classified) Unclassfied S - Shoreline F - Fish Np - Non-Fish Ns - Non-Fish Seasonal Wetlands Streets Points of Interest Parks Waterbodies 2021.sid Red: Band_1