535 VIEW RIDGE DR 2025-03-31 - Laserfiche WebLink

3.4-Critical Areas and Flood Plain There are no critical areas or flood plains on nor adjacent to this site. 3.5-Assessment Summary There does not appear to be any relevant nor significant chance of any impacts to fish habitat, groundwater levels or quality nor any other environmental features by the proposed development. There are no existing frontage improvements along View Ridge Drive and the existing street drainage flows west from this parcel. There will be no downstream net affect due to the proposed impervious areas. The proposed impervious area of the site is 7,742 SF. A...There are 3 mature on-site significant trees. B. The SFR is proposed to connect its roof drains to the storm drainage line that runs along the north side of the site and the driveway to sheet flow its stormwater runoff across the 24" dispersion berm to the landscape areas with compost amended soil. C. 50 % of the site is proposed to be disturbed with the foundation and grading operation. D/E/F. The house/garage is to be constructed 98 feet from the ROW(garage). Note face of garage is required to be 20 feet min from ROW with side & back yards 5 feet off of property lines. G. No porous/pervious paving is proposed. H. The driveway for the SFR is to sheet flow its stormwater runoff across the 24" dispersion berm to the landscape areas with compost amended soil. I...The new house will be 2 story. J. The House will be built with 14' wide looped driveway coming off of View Ridge Dr ROW so as to manage ease of access to street then widen out to 42 feet at the house. K. Landscaping areas to have compost amended soils per BMP T5.13 where disturbed and front lawn area that receives the driveway drainage. 3.6-Facility Sizing and Downstream Analysis Downstream Analysis 114 mile Drainage from this site sheet flows north across the lawn to Olympic Blvd where it is collected in CBs along the south side of the street flowing to the west. Once past the site to the west the culvert outlets to the grass lined roadside ditch along the south side of the street flowing to the south %mile to the hairpin bend in the road where it enters a culvert redirecting the drainage under Olympic Blvd then outletting to Pigeon Creek No 2 for another%mile to the north outletting to Puget Sound. There is no relevant nor significant chance of there being any impacts to fish habitat, groundwater levels or quality nor any other environmental features by the proposed house construction with the designed roof drains tying into the level spreader which is to discharge across lawn area. There is no Upstream basin to this site. Frontage drainage heads west and no change is proposed with it. The proposed impervious area of the site is 7,742 SF (33.5 % of site). There will be no downstream net effect due to the stormwater mitigations. There were no drainage inadequacies noted in the limited areas of downstream observation. There were no wetlands downstream within a '%miles of the site. See Engineering Plans and calculations. 8