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Table 1 <br /> Martin Marietta <br /> North Taft Hill Expansion Area <br /> Evaporative and Operational Consumptive Use <br /> Evaporation Operational <br /> Percent of Gross Lake Effective Net Lake Total Lake Crushed Washed Water Retained Total Lagged <br /> Month Annual Evaporation Precipitation Precipitation Evaporation Evaporation Aggregate Aggregate in Product Depletions Depletions <br /> Evaporation (ft) (in) (ft) (acre-ft/acre) (acre-feet) (tons) (tons) (acre-feet) (acre-feet) (acre-feet) <br /> (A) (B) (C) (D) (E) (F) (G) (H) (1) (J) (K) <br /> Jan-16 3.0% 0.10 0.36 0.02 0.00 0.00 21,200 31,800 1.25 1.25 1.86 <br /> Feb-16 3.5% 0.11 0.48 0.03 0.00 0.00 26,100 31,900 1.32 1.32 1.51 <br /> Mar-16 5.5% 0.17 1.18 0.07 0.11 0.32 33,750 41,250 1.71 2.03 1.37 <br /> Apr-16 9.0% 0.29 1.97 0.11 0.17 0.52 37,350 45,650 1.89 2.41 1.60 <br /> May-16 12.0% 0.38 2.74 0.16 0.22 0.67 33,200 49,800 1.95 2.62 1.99 <br /> Jun-16 14.5% 0.46 1.83 0.11 0.35 1.07 38,700 47,300 1.96 3.04 2.32 <br /> Jul-16 15.0% 0.48 1.62 0.09 0.38 1.16 38,700 47,300 1.96 3.12 2.66 <br /> Aug-16 13.5% 0.43 1.42 0.08 0.34 1.05 29,050 53,950 2.01 3.07 2.92 <br /> Sep-16 10.0% 0.32 1.27 0.07 0.24 0.74 33,200 49,800 1.95 2.69 3.02 <br /> Oct-16 7.0% 0.22 1.13 0.07 0.16 0.48 33,200 49,800 1.95 2.43 2.91 <br /> Nov-16 4.0% 0.13 0.59 0.03 0.09 0.28 26,250 48,750 1.82 2.10 2.69 <br /> Dec-16 3.0% 0.10 0.49 0.03 0.00 0.00 0 0 0.00 0.00 2.41 <br /> Total 100% 3.17 15.08 0.88 2.06 6.29 350,700 497,300 19.79 26.08 27.27 <br /> Total Exposed Water Surface= 3.05 acres within current permit boundary <br /> Annual Precipitation= 15.5 inches -Based on Western Regional Climate Center Fort Collins,CO Station(050035) <br /> Gross Annual Evaporation= 38 inches-Taken from NOAA Technical Report NWS 33 <br /> Notes: <br /> (A)Based upon SEO General Guidelines for Substitute Water Supply Plans for Sand and Gravel Pits. <br /> (B)Gross lake evaporation=(A)*(Gross Annual Evaporation/12). <br /> (C)Estimated using annual precipitation and average monthly distribution of precipitation from the Western Regional Climate Center-Fort Collins,CO(050035). <br /> (D)Effective precipitation=0.7*(C)/12. <br /> (E)Net lake evaporation from exposed water surfaces=(B)-(D).Based on information from the Western Regional Climate Center Station for Fort Collins,CO(053005)over a study period of 1893-2012,there is no <br /> evaporation December-February due to below-freezing average monthly temperatures. <br /> (F)Total lake evaporation from exposed water surfaces=(E)*Total Exposed Water Surface. <br /> (G)Crushed aggregate amounts provided by Martin Marietta. <br /> (H)Washed aggregate amounts provided by Martin Marietta. <br /> (I)Water retained in product equals 4%of total weight of washed aggregate produced and 2%of total weight of crushed aggregate produced. <br /> (J)Equal to(F)+(J) <br /> (K)Lagging calculations were based on the following parameters: <br /> Distance from stream=1,600 ft,Transmissivity=160,000 gpd/ft,Specific Yield=0.2,No-flow Boundary=2900 ft <br /> Lagged depletions at the site include historical mining depletions and current and past evaporative depletions. <br /> BBA <br /> .,-,,, o.. BISHOP An„rnea .1. ,1111% ,,v, <br />