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Home My WebLink AboutRS_Stream Study_Altmann Oliver Assoc_190520_V1 May 20, 2019 AOA-4902 Tom Dalpay 29709 – 174th Avenue SE Kent, WA 98042 tdalpay@comcast.net SUBJECT: Standard Stream Study for Dalpay Short Plat Parcel 032305-9120, City of Renton, WA Dear Tom : 1.0 INTRODUCTION This report is the result of a wetland reconnaissance and stream study on a 2.46- acre site located in the City of Renton, Washington. As part of the current project the site would be subdivided into five lots. Although no wetlands or streams were identified on the site, one stream (Greenes Creek) was observed off-site to the west. 2.0 METHODOLOGY On May 7, 2015 I conducted an initial wetland and stream reconnaissance 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). No wetlands were identified on the site during this reconnaissance or during a subsequent site review on October 11, 2016. On March 29, 2018 I conducted an updated site review to confirm the lack of wetlands on the property. During this site visit the ordinary high water (OHW) of the east side of Greenes Creek was delineated and subsequently surveyed (Figure 1). 3.0 GENERAL PROPERTY DESCRIPTION AND LAND USE The site consists of tax parcel 032305-9120 located at the NW corner of NE Sunset Boulevard and Nile Avenue NE in the City of Renton, Washington. It is found within the SE ¼ of the SE ¼ of Section 3, Township 23 North, Range 5 East, W.M. Tom Dalpay May 20, 2019 Page 2 The site is currently undeveloped and consists of a periodically mowed upland old pasture. Vegetation on the site was dominated by grasses, patches of Himalayan blackberry (Rubus armeniacus), and weeds such as Canada thistle (Cirsium arvense). In addition, a clump of bitter cherry (Prunus emarginata) saplings was observed in the northeast corner of the site. 4.0 RESULTS Greenes Creek is located entirely off-site to the west and drains from south to north through a Critical Area Tract associated with the Windstone Division 5 property. At the time of the March 29, 2018 delineation the channel width averaged approximately 1-foot wide and was somewhat undefined in places. Much of the channel was dry and only a slight flow was observed along segments of the channel. No wetlands were identified adjacent the stream during the delineation. Since the stream only conveys intermittent or highly seasonal flows and does not contain fish habitat it is considered a Type Ns stream by the City of Renton. Type Ns streams in the City of Renton require a 50-foot buffer and additional 15-foot building setback from the ordinary high water of the stream per RMC 4-3-050.G.2. The riparian corridor of Greenes Creek in the vicinity of the site consisted primarily of dense Himalayan blackberry with widely scattered black cottonwood (Populus trichocarpa), big-leaf maple (Acer macrophyllum), and Douglas fir (Pseudotsuga menziesii) trees. . 5.0 STREAM FUNCTIONS AND VALUES Riparian corridors provide many valuable ecological and social functions, including water quality protection and wildlife habitat. Although historically disturbed, the riparian corridor on the site does continue to provide some of these functions. The riparian corridor serves to trap sediments and other pollutants, thereby helping maintain water quality in downstream areas. In addition to its hydrologic functions, the riparian corridor also provides biological functions, including habitat for a variety of wildlife species typically found in suburban environments. Another biologic function of the riparian corridor is the transport of nutrients (via Greenes Creek) to downstream areas. Nutrients transported to downstream areas provide biological support for fish and other aquatic wildlife. Although privately owned, the on-site riparian corridor does provide some limited cultural functions as part of the overall open space associated with the site and adjacent critical area tract. The riparian corridor also contains some minor passive recreational opportunities such as wildlife viewing. Tom Dalpay May 20, 2019 Page 3 6.0 HABITAT ASSESSMENT As part of the stream 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 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 birds, small mammals, reptiles, and amphibians typically found within suburban environments, no threatened, endangered, sensitive, monitored, or priority species were identified on or adjacent the site during the field investigations and no critical habitat was observed. 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. 7.0 PROPOSED PROJECT As part of the proposed 5-lot short-plat, the on-site portion of the Greenes Creek buffer would be entirely preserved within a Critical Area Tract. It is my understanding that a rail fence with appropriate signage would be installed along the tract boundary and that no work is proposed within the stream buffer. If you have any questions, please give me a call. Sincerely, ALTMANN OLIVER ASSOCIATES, LLC John Altmann Ecologist Pictom etr y, Ki ng C ou n ty, K ing C ou nty Date : 5/20/20 19 Notes: ±The informati on included on this map has been compi led by King County staff from a variety of sour ces and issubject to change wi thout notice. King County makes no r epresentati ons or w ar ranties, expr ess or impl ied,as to accurac y, completenes s, timeli ness , or ri ghts to the use of such infor mation. This document is not intendedfor use as a s urvey pr oduct. King County shall not be liable for any gener al, s pecial, i ndir ect, incidental , orconsequential damages incl uding, but not li mited to, lost revenues or lost pr ofits resulting fr om the use or misuseof the information contained on this map. Any sale of this map or infor mati on on this map is pr ohibited except bywritten per mi ssi on of Ki ng County. Parcel 03230 5-91 2 0 SDSDSDSDSDSD GGGGGGGGGGGGGGGGGGGGGGGGGG EEEEEEEEEEEEEEEEEETTTTTTTTTTTTTTTTTTTTTTTTTTTTTTSS SS SS SS SS SS SS SS SS SSSSSS SS SSX XXXXXXXXXXXXXXXXXXXXXWWWWWSS SS SS SS GGGGGGWWGGGGGG G GSSTTSS"C""A""B""N""M""L""K""J""H""I""G""D""E""F""O""P""Q""R""S""T"PROJECTDRAWNDATESCALEREVISEDLandscapeArchitectureAOAEnvironmentalPlanning &Office (425) 333-4535PO Box 578Carnation, WA 98014Fax (425) 333-4509Altmann Oliver Associates, LLC4902-MIT-05-03-19.dwg SDSDSDSDSDSD GGGGGGGGGGGGGGGGGGGGGGGGGG EEEEEEEEEEEEEEEEEETTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTSS SS SS SS SS SS SS SS SS SSSSSS SS SSX XXXXXXXXXXXXXXXXXXXXXWWWWWSS SS SS SS GGGGGWWGGGGGG G GSSTTSS"C""A""B""N""M""L""K""J""H""I""G""D""E""F""O""P""Q""R""S""T"PROJECTDRAWNDATESCALEREVISEDLandscapeArchitectureAOAEnvironmentalPlanning &Office (425) 333-4535PO Box 578Carnation, WA 98014Fax (425) 333-4509Altmann Oliver Associates, LLC4902-MIT-05-03-19.dwg