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SECTION 2 - Risk Assessment and Erosion Control <br />The project's risk of harm to the site's receiving waters can be quantified per the <br />methods established in Snohomish County Policy POL-3044. The proposed <br />development meets many of the requirements for a MEDIUM RISK project as <br />follows: <br />Less than 2 acres of the site are to be disturbed and slopes across this <br />area are less than 10%. <br />The Alderwood type soils found on site present a medium erosion hazard <br />(per Appendix A of PRO-3044.) <br />Exposure of the underlying soil materials to erosive forces is not <br />anticipated, since very little cut is proposed. <br />The site is approximately 210 feet upstream of a pond (the Herschlip Pond). The <br />Herschlip Pond discharges directly to Silver Lake Creek, a Type 3 stream. Since <br />this critical area falls within a 1/a mile downstream of the project, the proposed <br />construction falls within the HIGH RISK category. <br />A Level 1 or 2 Surface Water Pollution Prevention Plan will be prepared for the <br />project as required ano designated by Snohomish County Drainage and Grading <br />Review Staff. Winter or Wet Season construction is NOT proposed for the <br />project. <br />Targeted Drainage Report for Everett Public Schools Section 2 — Risk & Erosion Control <br />Silver Lake Elementary Parking Lot Expansion January 6, 2003 <br />By: Perfect Engineering <br />