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Location: Basin 3 <br />1. Runoff curve number (Cn) <br />Cover description <br />Forest <br />Disturbed <br />CN (weighted): 87 <br />2. Runoff <br />Frequency: <br />Rainfall, P (24-hour): <br />Runoff, Q: <br />Runoff Volume: <br />Time of Concentration (Tc) <br />Peak Flow <br />CN Soil Type Area <br />79 C&D 0.010 Acres <br />87 D 0.530 Acres <br />10 yr <br />1.60 in <br />0.5986 in <br />0.0269 Acre-Ft <br />0.019 hrs, 1.2 min. <br />0.50 cfs <br />Sump 3 will have approximate dimensions of 15' x 16' x 5' <br />Location: Basin 4 <br />1. Runoff Curve Number (CN) <br />Cover description CN <br />Forest 79 <br />Disturbed 87 <br />CN (weighted): 86.8 <br />Total Area: 0.400 Acre <br />2. Runoff <br />Return Period: <br />Rainfall, P: <br />Runoff, Q: <br />Runoff Volume: <br />Time of Concentration (Tc) <br />Peak Flow <br />10-Year <br />1.60 in <br />0.5962 in <br />0.0199 Acre-Ft <br />0.019 hrs, 1.0 min. <br />0.37 cfs <br />Soil Group Area(Acre) <br />C&D 0.010 <br />D 0.390 <br />Sump 4 will have approximate dimensions of 8' x 33' x 3' with a 1' tall berm on the <br />downhill side. The berm will have 2H:1V sideslopes. <br />In order to install Sump 4, an area of old road must be re-established by removing <br />some large blocks of marble in the area, possibly with blasting. This will require <br />significant work but must be done to control runoff from this area. Once a 10 feet <br />wide flat bench is established, the sump will be excavated from the end portion of <br />this flat bench. <br />Yule Quarry April 10 21