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Stormwater Pollution Prevention Plan <br /> 2.0 Site Description <br /> 2.1 Existing Conditions <br /> The existing site is currently undeveloped except for a paved access road that crosses the <br /> southern portion of the site and services a pump station. The access road has a tightlined storm <br /> drainage system that appears to drain from the existing pump station and discharge into the <br /> existing wetlands onsite. The access road also, has a sewer mainline running along its length. <br /> The remaining site is comprised of pasture, centrally located wetlands and forested area. Site <br /> soils are till soils consisting of Alderwood—Urban Land Comlex. The existing site slopes <br /> towards the centrally located wetlands with grades ranging from approximately 0.5%to <br /> approximately 35%. Current runoff collects in the on-site wetlands and eventually drains into a <br /> natural, on-site watercourse which flows southerly off of the site. Flows eventually enter Swamp <br /> Creek, a tributary to the Sammamish River. <br /> 2.2 Proposed Construction Activities <br /> The proposed Paine Field Addition project will consist of clearing 1.95 acres of the <br /> approximately 9.51 acres site. The area to be cleared borders Airport Road. An additional 3.33 <br /> acres of the site will be mowed. Construction activities will include excavation and grading. <br /> 3 <br />