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SECTION IV: CONSTRUCTION STORMWATER POLLUTION <br /> PREVENTION PLAN <br /> This Stormwater Pollution Prevention Plan(SWPPP) has been prepared as part of <br /> the Construction stormwater permit requirements for the project Seahurst Lane in Everett, <br /> WA. Itis located in Section 1, Township 28 North, and Range 4 East of the Willamette <br /> Meridian in the City of Everett, Washington. The site is currently undeveloped and covered <br /> with native vegetation. There is a wetland located to the east of the site, an associated <br /> buffer has been designated. The site contains one drainage basin that drains to the east to <br /> Pigeon Creek. Per NRCS survey of Snohomish County, the project site contains <br /> Alderwood Urban Land Complex 0 to 8 percent soils that have a hydrologic classification <br /> of Type '`C" and Everett soil that have a hydrologic classification of Type "A". The site <br /> area of the project is approximately 5.00 Acres. The clearing area is 2.61 Acres. The <br /> proposal is to subdivide the property into ten lots and construct ten new single-family <br /> homes, approximately 533-1f of road with associated utilities. The access to the project site <br /> will be from 54th Street. <br /> A 108'x 29.50'x 14' wetvault located underneath the open space near the central <br /> portion of the site is proposed to meet the flow control requirements conforming to the City <br /> of Everett requirements. The wetvault will have a detention depth of 9.50-ft, 3.50-ft of <br /> wetpool depth and 1-ft of sediment storage. The wetvault was sized using Western <br /> Washington Hydrology Model V 4.2.13 (WWHM). The roof and the yard drains will be <br /> connected to the onsite detention system. The outflow from the wetvault will be discharged <br /> to the east via a closed pipe system to a stilling basin for energy dissipation and eventually <br /> drains to its natural drain course to Pigeon Creek. Runoff treatment would be obtained by <br /> wetvault. <br /> The purpose of this SWPPP is to describe the proposed construction <br /> activities and all temporary and permanent erosion and sediment control (TESC) measures, <br /> pollution prevention measures, inspection/monitoring activities, and recordkeeping that <br /> will be implemented during the proposed construction project. The objectives of the <br /> SWPPP are to: <br /> Insight Engineering Co. -Stormwater Site Plan 07/03/2019 <br /> - 15- <br />