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EVERETT PUBLIC SCHOOLS <br />SILVER LAKE ELEMENTARY PARKING LOT EXPANSION <br />TARGETED DRAINAGE REPORT <br />Section I —Site Drainage Narrative <br />January 6, 2003 <br />.Introduction <br />The Silver Lake Elementary School is located in the SW1/4 of the SW1/4 of Section 32, <br />Township 29, Range 5 East, in Snohomish County, Washington as shown in Figure 1— <br />Site Vicinity Map. The Soil Survey of Snohomish County Area Washington identifies site <br />soils on the site as Alderwood -Urban Land Complex. <br />The Everett Public Schools proposes to construct a new parking lot, two new access <br />points, one redeveloped access points, and to provide minor sidewalk, entry, striping and <br />signage improvements. This Targeted Drainage Plan has been prepared in support of <br />SEPA and Conditional Use Permit documents. <br />Existing Site Conditions <br />The existing School Property Area is just over 11 Acres and the existing Lot 7 Area is <br />just over t/4 - Acre. Existing structures and site features include a daycare/church <br />facility, five school buildings including one covered play'area, three portables, courtyard <br />area, four parking areas, and playfields. The site is currently accessed from SR-527 in <br />two locations. The school has very limited pedestrian and student access. <br />Existing Area Calculations <br />❖ Approximately 41% and 59% of the Existing PDA is impervious and pervious <br />respectively. <br />❖ Approximately 19% of the Existing PDA is Pollution Generating Impervious Surface <br />(PGIS). <br />❖ Approximately 36% of the Existing PDA is Pollution Generating Pervious Surface <br />(PGPS). <br />See Existing Area .Calculations in Appendix A. <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: Perteet Engineering Page 2 of 7 <br />