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APPENDIX G-1 SURFACE WATER RUNOFF CALCULATIONS <br /> All runoff calculations were completed using the Natural Resource Conservation Service TR-55 <br /> methodology. <br /> 1. Baseline Conditions <br /> 1_1 Area 1 <br /> Runoff Curve Number and Runoff <br /> Project:23 1/4 West Pit <br /> Project: Baseline Runoff By: B Langenfeld Date: 05/28/20 <br /> Location: 23 1/4 West Pit -Area 1 <br /> Present <br /> 1. Runoff Curve Number(CN) <br /> Cover description CN Soil Group Area(Acre) <br /> Pasture Grassland Range(Fair) 79 C 30.0 <br /> CN(weighted): 79.0 <br /> Total Area: 30.0 Acre <br /> 2. Runoff <br /> Return Period: 100 YEAR <br /> Rainfall, P: 2.21 in <br /> Runoff,Q: 0.65 in <br /> Runoff Volume: 1.62 Acre-Ft <br /> 1_2 Area 2 <br /> Runoff Curve Number and Runoff <br /> Project:23 1/4 West Pit <br /> Project: Baseline Runoff By: B Langenfeld Date: 07/29/20 <br /> Location: 23 1/4 West Pit -Area 2 <br /> Present <br /> 1. Runoff Curve Number(CN) <br /> Cover description CN Soil Group Area(Acre) <br /> Pasture Grassland Range(Fair) 79 C 18.5 <br /> CN(weighted): 79.0 <br /> Total Area: 18.5 Acre <br /> 2. Runoff <br /> Return Period: 100 YEAR <br /> Rainfall, P: 2.21 in <br /> Runoff,Q: 0.65 in <br /> Runoff Volume: 1.00 Acre-Ft <br /> 23 114 West <br /> October 2020 AG-1-1 <br />