Laserfiche WebLink
Stormwater Pollution Prevention Plan <br /> percent of the 2-year flow and the 50-year flow. The water quality flow rate for the Stormfilters <br /> is the 2 year flow exiting the detention system. <br /> After the building is constructed and all new utilities are installed,the site will be graded and <br /> paved. <br /> The following summarizes details regarding site areas: <br /> • Total site area: 2.38 acres <br /> • Percent impervious area before construction: 10 %(0% in calcs) <br /> ■ Percent impervious area after construction: 76 % <br /> ■ Disturbed area during construction: 2.38 acres <br /> ■ Disturbed area that is characterized as impervious (i.e., access <br /> roads, staging, parking): 1.82 acres <br /> ■ 2-year stormwater runoff peak flow prior to construction <br /> (existing): 0.04 cfs <br /> ■ 10-year stormwater runoff peak flow prior to construction <br /> (existing): 0.08 cfs <br /> • 2-year stormwater runoff peak flow during construction: 0.56 cfs <br /> ■ 10-year stormwater runoff peak flow during construction: 0.91 cfs • <br /> ■ 2-year stormwater runoff peak flow after construction: 0.03 cfs <br /> • 10-year stormwater runoff peak flow after construction: 0.09 cfs <br /> All stormwater flow calculations are provided in Appendix F. <br /> 4 <br />