3618 SHORE AVE 2023-10-24 - Laserfiche WebLink

3.1.5 Preparation of Construction Stormwater Pollution Prevention Plan (SWPPP),Vol 1, Section 3.1.6 A construction stormwater pollution prevention plan has been included in this report with elements shown on the TESC plan. 3.1.6 Completion of Stormwater Site Plan,Vol. 1, Section 3.1.7 A stormwater site plan has been prepared showing the locations of all proposed drainage elements. 2.5.2 Minimum Requirement#2: Construction Stormwater Pollution Prevention(SWPP) The construction stormwater pollution prevention plan has been included in this report. Relevant elements include temporary construction entrance, silt fence, and straw wattles. 2.5.3 Minimum Requirement#3: Source Control of Pollution Single family residential sites are not required to provide Source Control BMPs. Ecology encourages single family residential sites and other sites not required by an NPDES permit or local government to select Source Control BMPs the maximum extent practical. 2.5.4 Minimum Requirement#4: Preservation of Natural Drainage Systems and Outfalls The site's topography indicates that natural drainage occurs as surface runoff flowing off downslope from the property lines as the site slopes towards Shore Ave. With the proposed(and future lot 2) development, runoff will be directed to the utility in Shore Ave as well. 2.5.5 Minimum Requirement#5: On Site Stormwater Management Since this project triggers Minimum Requirements#1-9 but is exempt from flow control, the hierarchal order of BMP's in List#3 has been evaluated. Full Infiltration- Infeasible per the memorandum provided by Nelson Geotechnical Associates due to the threat of groundwater seepage to the near steep slope beneath the subject site. Downspout Dispersion- Feasible. See below. Proposed Rooftop: 2,337 SF (lot 1) and future development of lot 2 rooftop: 2,734 sf the proposed rooftop will be routed by Downspout Dispersion via a stormdrain tightlined that will ultimately route flows to the stormwater utility under Shore Ave.