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2. Mining Conditions <br /> 2_1 Area 1 <br /> Runoff Curve Number and Runoff <br /> Project:23 1/4 West Pit <br /> Project: Mining Runoff By: B Langenfeld Date:05/28/20 <br /> Location: 23 1/4 West Pit—Area 1 <br /> Disturbed <br /> 1. Runoff Curve Number(CN) <br /> Cover description CN Soil Group Area(Acre) <br /> Pastyure Grassland Range(Fair) 79 C 3.2 <br /> Mined Land, Disturbed (Poor) 87 C 26.8 <br /> CN (weighted): 86.1 <br /> Total Area: 30.0 Acre <br /> 2. Runoff <br /> Return Period: 100 YEAR <br /> Rainfall, P: 2.21 in <br /> Runoff,Q: 1.02 in <br /> Runoff Volume: 2.55 Acre-Ft <br /> 2.2 Area 2 <br /> Runoff Curve Number and Runoff <br /> Project:23 1/4 West Pit <br /> Project: Mining Runoff By: B Langenfeld Date:05/28/20 <br /> Location: 23 1/4 West Pit—Area 2 <br /> Disturbed <br /> 1. Runoff Curve Number(CN) <br /> Cover description CN Soil Group Area(Acre) <br /> Pastyure Grassland Range(Fair) 79 C 4.5 <br /> Mined Land, Disturbed (Poor) 87 C 14.0 <br /> CN (weighted): 85.1 <br /> Total Area: 18.5 Acre <br /> 2. Runoff <br /> Return Period: 100 YEAR <br /> Rainfall, P: 2.21 in <br /> Runoff,Q: 0.95 in <br /> Runoff Volume: 1.47 Acre-Ft <br /> 23 l 4 West AG-1-2 <br /> July 2020 <br />