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The pre -mine surface drainage has changed slightly to incorporate mining and reclamation that <br />has taken place up through 2008. This was the point at which pit dewatering was redirected <br />from Pond 007 to Pond 011. The primary impact this has had on Pond 011 drainage is the <br />change of surface topography immediately west of 2700 Road. This can be seen on Map <br />2.05.3(3) -9. <br />Runoff Curve Number and Runoff <br />Project: Pond 011 <br />Location: New Horizon #2 West <br />Developed <br />1. Runoff Curve Number ( CN) <br />Cover description CN <br />Pasture Grassland Range ( Good) <br />Pasture Grassland Range ( Good) <br />CN (weighted): 80.0 <br />Total Area: 176.003 Acre <br />2. Runoff <br />Return Period: <br />Rainfall, P: <br />Runoff, Q: <br />Runoff Volume: <br />C- Factor Calculation <br />By: B. Langenfeld Date: 07/09/09 <br />Soil Type Area(Acre) <br />80 D 32.154 <br />80 D 105.133 <br />80 D 38.716 <br />10 -Year <br />2.00 in <br />0.5625 in <br />8.2501 Acre -Ft <br />Project: Pond 011 <br />Location: New Horizon Mine <br />Developed <br />C- factor (CF) <br />Cover description <br />Irrigated Pasture <br />Irrigated Pasture <br />Irrigated Pasture <br />By: B Langenfeld Date: 08/07/09 <br />Checked: Date: <br />CF <br />Area(Acre) <br />0.500 <br />25.506 <br />0.500 <br />101.900 <br />0.500 <br />38.668 <br />CF (weighted): 0.500 <br />Total Area: 166.074 Acre <br />Time of Concentration ( SCS Method) <br />Project: Pond 011 <br />Location: New Horizon Mine <br />Developed <br />By: B Langenfeld Date: 08/07/09 <br />Checked: Date: <br />Revised January 2010 (PR06) Attachment 2.05.3(3) -14 -3 <br />