7420 UPPER RIDGE RD 2022-05-10 - Laserfiche WebLink

EXISTING CONDITIONS SUMMARY The Staniford residence Lot 2 is a .15 Acre site consisting of grass vegetation and an existing gravel driveway.The site slopes from east to west with slopes approximately 20 percent down to the existing sidewalk on Upper Ridge Road.The existing project site is pervious, except for an existing gravel driveway. PROPOSED CONDITIONS SUMMARY The Staniford project lot 2 proposes a new house and new concrete driveway to replace the existing gravel driveway. Site improvements include clearing and grading, and stormwater improvements for stormwater infiltration of the proposed house and driveway areas.The Staniford project lot 2 will be looking at BMPs for the proposed house and driveway areas. Stormwater management was evaluated for both the proposed house roof area and proposed driveway area. Full Downspout Infiltration has been selected to manage stormwater runoff from the proposed house and proposed driveway. Roof leaders will route stormwater along the proposed house and connect to an infiltration gallery, if needed a structure will be set in the driveway to collect stormwater and disperse it into the infiltration gallery. Modeling has been run for both areas in the WWHM and will be attached to this report to show sizing and infiltration rates. DOE Stormwater Management Manual — Minimum Requirements Volume 1 of the Department of Ecology Stormwater Manual for Western Washington describes the Minimum Requirements for Stormwater management for a new development project. Using the flowchart below, Minimum Requirements#1- 5 apply to the Staniford Project. JJTEAM