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Other Hard Surfaces: - <br /> 1. Full Dispersion: Not feasible due to site slopes exceeding 15% and not having the <br /> minimum 100-foot vegetated flow path for developed site runoff. <br /> 2. Rain Gardens: Not feasible due to existing site soils and excessive cuts. <br /> 3. Permeable Pavement: Not feasible due to existing site soils and excessive cuts. <br /> 4. Sheet flow dispersion: Selected, driveway runoff will be allowed to sheet flow off of <br /> the edge of pavement and then flow over the future amended soils/landscaping. <br /> 5. Concentrated Flow Dispersion: Higher priority option selected. <br /> Summary of proposed on-site Stormwater Management BMPs incorporated into project <br /> design: <br /> Roof downspouts will be collected and conveyed to a perforated stub-out connection prior <br /> to release-from the site via a level spreader to the east. The dispersion trench has been <br /> designed to accommodate up to 0.5 cfs per the DOE 2019 SWMMWW V-1.4.3. <br /> Driveways will be dispersed along the edge of pavement into the adjacent landscaping area <br /> that has been treated with amended soils and stabilized with grass or mulch. <br /> 8. SUMMARY <br /> This project proposes to construct 6,676 sf of new hard surfaces. As a result, as agreed <br /> between the property owner and City, by the owner permitting this under one application, <br /> the stormwater design for this project has met or exceeded all the applicable Minimum <br /> Requirements 1-5. <br /> Seahurst SP 18-1015 <br /> May-2020 Page 10 <br />