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Month <br />Lake <br />Evaporation <br />Distribution <br />(percent) <br />Gross Lake <br />Evaporation <br />(feet) <br />Total Average <br />Precipitation <br />(inches) <br />Effective <br />Precipitation <br />Credit (feet) <br />Net Lake <br />Evaporation <br />(feet) <br />Total <br />Exposed <br />Surface <br />Area <br />(acres) <br />Maximum <br />Lake <br />Depletions <br />(acre -feet) <br />January <br />3.0 <br />0.11 <br />0.42 <br />0.02 <br />0.09 <br />0.05 <br />0.00 <br />February <br />3.5 <br />0.13 <br />0.37 <br />0.02 <br />0.11 <br />0.05 <br />0.01 <br />March <br />5.5 <br />0.21 <br />1.14 <br />0.07 <br />0.14 <br />0.05 <br />0.01 <br />April <br />9.0 <br />0.34 <br />1.78 <br />0.10 <br />023 <br />0.05 <br />0.01 <br />May <br />12.0 <br />0.45 <br />2.37 <br />0.14 <br />0.31 <br />0.05 <br />0.02 <br />June <br />14.5 <br />0.54 <br />1.64 <br />0.10 <br />0.45 <br />0.05 <br />0.02 <br />July <br />15.0 <br />0.56 <br />' 1.64 <br />0.10 <br />0.47 <br />0.05 <br />0.02 <br />August <br />13.5 <br />0.51 <br />1.67 <br />0.10 <br />0.41 <br />0.05 <br />0.02 <br />September <br />10.0 <br />0.38 <br />0.95 <br />0.06 <br />0.32 <br />0.05 <br />0.02 <br />October <br />7.0 <br />0.26 <br />0.92 <br />0.05 <br />0.21 <br />0.05 <br />0.01 <br />November <br />4.0 <br />0.15 <br />0.76 <br />0.04 <br />0.11 <br />0.05 <br />0.01 <br />December <br />3.0 <br />0.11 <br />0.51 <br />0.03 <br />0.08 <br />0.05 <br />0.00 <br />Total <br />100.0 <br />3.75 <br />14.17 <br />0.83 <br />2.92 <br />0.05 <br />0.15 <br />Month <br />Percent <br />Production <br />(percent) <br />Tons <br />Produced' <br />Cubic feet <br />of Waterby <br />Weight <br />Moisture <br />Loss with <br />Gravel <br />(acre -feet) <br />Dust <br />Control <br />(acre- feet)' <br />Net Exposed <br />Groundwater <br />Evaporative <br />Loss' <br />Total <br />Depletions <br />at Centroid <br />of Pit <br />(acre -feet) <br />Lagged <br />Depletions' <br />(acre -feet) <br />River <br />Depletions <br />(acre -feet) <br />January <br />0 <br />0 <br />0 <br />0 <br />0.00 <br />0.00 <br />0.00 <br />0.00 <br />0.003 <br />February <br />6.3 <br />27,500 <br />35,256 <br />0.81 <br />0.06 <br />0.01 <br />0.88 <br />0.28 <br />0.59 <br />March <br />8.0 <br />35,000 <br />44,872 <br />1.03 <br />0.08 <br />0.01 <br />1.12 <br />0.27 <br />0.84 <br />April <br />9.6 <br />42,000 <br />53,846 <br />1.24 <br />0.10 <br />0.01 <br />1.34 <br />0.29 <br />1.06 <br />May <br />11.0 <br />48,000 <br />61,538 <br />1.41 <br />0.11 <br />0.02 <br />1.54 <br />0.30 <br />1.24 <br />June <br />13.0 <br />57,000 <br />73,077 <br />1.68 <br />0.13 <br />0.02 <br />1.83 <br />0.34 <br />1.49 <br />July <br />14.4 <br />63,000 <br />80,769 <br />1.85 <br />0.14 <br />0.02 <br />2.02 <br />0.34 <br />1.68 <br />August <br />11.0 <br />48,000 <br />61,538 <br />1.41 <br />0.11 <br />0.02 <br />1.54 <br />0.15 <br />1.40 <br />September <br />10.8 <br />47,000 <br />60,256 <br />1.38 <br />0.11 <br />0.02 <br />1.51 <br />0.15 <br />1.36 <br />October <br />9.6 <br />42,000 <br />53,846 <br />1.24 <br />0.10 <br />0.01 <br />1.34 <br />0.10 <br />1.24 <br />November <br />6.3 <br />27,600 <br />35,385 <br />0.81 <br />0.06 <br />0.01 <br />0.88 <br />-0.04 <br />0.92 <br />December <br />0 <br />0 <br />0 <br />0 <br />0.00 <br />0.00 <br />0.00 <br />-0.26 <br />0.27 <br />Total <br />100.0 <br />437,100 <br />560,385 <br />12.86 <br />1.00 <br />0.15 <br />14.01 <br />1.92 <br />12.09 <br />Table 1 <br />Evaporative Loss - Sta <br />1 From State Engineer (2004) for elevations below 6,500 feet mean sea level. <br />2 Based on average annual evaporation for the area (NOAA 1982). <br />3 Source: Average precipitation Brighton, CO for period of record (10/1/1973 to 1/31/2012) at: wrcc @dri.edu. Accessed 1/31/2012 <br />4 Effective precipitation is 70 percent of total precipitation (credit against evaporation; converted to feet) <br />5 Exposed ground water within the Stagecoach Pit mine permit boundary is estimated to be 0.05 acres based on the 2012 aerial <br />photo and the recent land survey conducted by Deere & Ault Consultants, Inc. (letter report dated 2/10/2012). This assumes no <br />exposed water pre -1981. <br />Table 2 Total Depletions - Stagecoach Pit <br />Notes: <br />1 Production is estimated at 437,100 tons per year for Stagecoach Pit. <br />2 Calculation assumed 4 percent water loss with mined product. <br />3 Calculation assumed 1 acre -feet for dust control. <br />4 From Table 1 far right column <br />5 From Glover calculation <br />