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EVERETT PUBLIC SCHOOLS <br /> SILVER LAKE ELEMENTARY PARKING LOT EXPANSION <br /> TARGETED DRAINAGE REPORT <br /> Section 1 —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'/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 />