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Acre Short Plat Stormwater Site Plan <br /> SECTION 3 - SITE DEVELOPMENT PLAN w/ ON-SITE STORMWATER <br /> MANAGEMENT <br /> Per MR #5, on-site stormwater management is required to infiltrate, retain, and disperse stormwater <br /> runoff on-site to the maximum extent feasible without causing flooding or erosion impacts. Chapter 12, <br /> Volume III of the 2010 COESWMM outlines the on-site stormwater management strategies and Best <br /> Management Practices (BMPs) that must be implemented, where feasible, in order to meet MR#5. The <br /> potential BMPs that were evaluated for this project include: <br /> • Vegetation Protection Areas <br /> • Soil Amendments, Quality and Depth <br /> • Onsite Infiltration Areas <br /> • Raingardens <br /> • Downspout Dispersion Systems <br /> • Concentrated Flow Dispersion <br /> • Sheet Flow Dispersion <br /> Due to the site layout and topography, approximately 0.24 acres of the 0,64-acre property will not be <br /> disturbed and will remain as forested.Amended soils will be provided in disturbed pervious areas. <br /> Per the Geotechnical Report (Appendix A), infiltration is not a practical option due to the extent of non- <br /> native fill materials over much of the site. Also, infiltration is not viable on a steep slope site such as this one. <br /> Bioretention facilities are not feasible due to the lack of open space, inability to infiltrate, and the <br /> presence of steep slopes. <br /> Dispersion systems are not viable due to the site topography and the inability to meet required minimum <br /> flow path lengths. <br /> The developed site conditions and proposed storm drainage facilities are described in more detail in <br /> Section 8 —Off-Site Analysis. <br /> i <br /> E <br /> i <br /> E <br /> i <br /> f <br /> October 15, 2021 <br /> Page 6 <br />