Laserfiche WebLink
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 Burger King located at <br /> 8525 Evergreen Way, Everett WA 98208. More generally; the site is in Section 13, <br /> Township 28 North, and Range 4 East of the Willamette Meridian in the City of Everett, <br /> Washington. The site is currently developed with an existing commercial building with <br /> associated parking and exists as almost entirely impervious apart from planters in the <br /> northwest and southeast corner of the site. The site is relatively flat and consists of two <br /> drainage basins of which the respective flows do not converge within 1 mile downstream <br /> of the site. Therefore, the site contains two threshold discharge areas: Basin "A" contains <br /> 0.42 acres in the northwest portion of the site draining to Evergreen Way and Basin "B" <br /> consisting of 0.61 acres to the southwest and draining to Holly Dr. Please refer to the Basin <br /> Maps provided in Section III of this report for more information. Per NRCS survey of <br /> Snohomish County, the project site contains Alderwood Urban Land Complex 2 to 8 <br /> percent soils that have a hydrologic classification of Type "C". <br /> The site area is 0.98 acres with a clearing area of 1.03 acres. The proposal includes <br /> removing the existing building and construction of a new building, sidewalks, and planters. <br /> Access to the site will be from Evergreen Way. A detailed breakdown of all the site's areas <br /> has been included under Appendix A. <br /> Minimum requirements 1-9 apply to Basin A as the proposal involves replacement <br /> of more than 5,000SF of impervious surface. Refer to the Flowchart for Determining <br /> Requirements for Redevelopment attached in the next page. Basin A is exempt from flow <br /> control as there will be less than a 0.15 CFS increase in offsite runoff and the effective <br /> impervious are is 4,643 SF which is less than the 5,000 SF threshold requiring flow control. <br /> See Section 8D of this report for the hydraulic calculations. Water quality is also exempt as <br /> the proposed PGHS is 4,902 SF which is less than the 5,000 SF threshold to for water <br /> quality. See Section 3 for hard surface replacement, PGHS, and effective impervious totals. <br /> Insight Engineering Co. -Stormwater Site Plan 12/20/2018 <br /> - 19- <br />