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NORTH MIDDLE SCHOOL <br />• <br />III. SITE DEVELOPMENT PLAN WITH ON -SITE STORMWATER <br />MANAGEMENT <br />PROJECT THRESHOLDS <br />THRESHOLD DISCHARGE <br />The project site discharges to a single threshold discharge area but is conveyed from the site at many different <br />points. <br />IMPERVIOUS SURFACE <br />The existing and proposed impervious areas for the North Middle School main site are summarized in Table 1. <br />The same conditions for the athletic field and the athletic field alternative are summarized in Table 2. The right-of- <br />way conditions are summarized in Table 3. Table 4 summarizes the total site impervious areas with the existing <br />grass field and the field alternate (synthetic and impervious) conditions. <br />Table 1. Existing and Proposed Impervious Surfaces Main Site <br />Impervious Surface <br />Area (square feet) <br />Area (acres) <br />Existing <br />181,630 <br />4.170 <br />Proposed <br />165,620 <br />3.802 <br />Table 2. Existing and Proposed Impervious Surfaces Field (Existing Grass and Synthetic <br />Alternate) <br />Impervious Surface <br />Area (square feet) <br />Area (acres) <br />Existing <br />28,610 <br />0.657 <br />Proposed <br />185,835 <br />4.266 <br />Table 3. Existing and Proposed Impervious Surfaces Right -of -Way <br />Impervious Surface <br />Area (square feet) <br />Area (acres) <br />Existing <br />19,095 <br />0.438 <br />Proposed <br />18,505 <br />0.425 <br />Table 4. Existing and Proposed Impervious with Grass Field Vs. Synthetic <br />Impervious Surface <br />Area (square feet) <br />Area (acres) <br />Existing Grass Field <br />210,240 <br />4.826 <br />New Synthetic (Alternate) <br />351,455 <br />8.068 <br />INTERIM POLICY <br />The project will discharge to the public combined sewer system (it is within the combined sewer area) and creates <br />and/or redevelops more than 2,000 square feet of impervious area, so the 'Public Works Interim Policy 2-11: <br />Stormwater Control in the Combined Sewer Area" (Interim Policy) will apply. See Appendix A for a copy of the <br />Interim Policy. <br />According to the Interim Policy, the project will be required to consider all Minimum Requirements with the <br />following exceptions: <br />• Minimum Requirement #6 is not applicable; <br />• • Minimum Requirement #7 can now be assessed replacing the term "a forested land cover" with "the <br />existing site conditions." <br />COUGHLINPORTERLUNDEEN <br />S,R11,< RA.. s. �N ._.,,.... <br />