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- Baseline Site Runoff <br />Project: Baseline Runoff <br />By: B Langenfeld Date: 04/20/12 <br />Location: Tomichi Pit <br />Present <br />1. Runoff Curve Number (CN) <br />Cover description <br />Pasture Grassland Range (Good) <br />CN (weighted): 74.0 <br />Total Area: 208.958 Acre <br />2. Runoff <br />Return Period: <br />100 -Year <br />Rainfall, P: <br />2.20 <br />Runoff, Q: <br />0.4474 <br />Runoff Volume: <br />7.7909 <br />Runoff to Pits During Mining <br />Project: Runoff to Pits during <br />Mining <br />By: B Langenfeld Date: 04/20/12 <br />Location: Tomichi Pit <br />Developed <br />1. Runoff Curve Number (CN) <br />Cover description <br />Mined Land, Disturbed (Poor) <br />Pasture Grassland Range (Good) <br />CN (weighted): 78.9 <br />Total Area: 183.875 Acre <br />2. Runoff <br />Return Period: <br />100 -Year <br />Rainfall, P: <br />2.20 <br />Runoff, Q: <br />0.6383 <br />Runoff Volume: <br />9.7812 <br />Tomichi Pit, December 2013 G -2 <br />Checked: <br />Date: <br />CN Soil Group Area(Acre) <br />74 C 208.958 <br />in <br />in <br />Acre -Ft <br />Checked: <br />Date: <br />CN Soil Group Area(Acre) <br />87 C 69.105 <br />74 C 114.770 <br />in <br />in <br />Acre -Ft <br />