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Table 2 Martin Marietta 2014-2015 South Platte Combined Sites SWSP Riverbend West Demands Table Annual Evap Exposed Area (ft) (ac) 3.75 9 Percent of Gross Net Evaporative Annual Evaporation Gross Average Effective Evaporation Consumptive Lagged Month Evaporation Rate Evaporation Precipitation Precipitation Rate Use Depletion (%) (feet) (acre-feet) (inches) (feet) (feet) (acre-feet) (acre-feet) (1) (2) (3) (4) (5) (6) (7) (8) Nov-14 4.0% 0.15 1.35 0.76 0.04 0.11 0.95 2.29 Dec-14 3.0% 0.11 1.01 0.51 0.03 0.08 0.74 1.82 Jan-15 3.0% 0.11 1.01 0.42 0.02 0.09 0.79 1.52 Feb-15 3.5% 0.13 1.18 0.39 0.02 0.11 0.98 1.36 Mar-15 5.5% 0.21 1.86 1.11 0.06 0.14 1.27 1.33 Apr-15 9.0% 0.34 3.04 1.76 0.10 0.23 2.11 1.52 May-15 12.0% 0.45 4.05 2.33 0.14 0.31 2.83 1.89 Jun-15 14.5% 0.54 4.89 1.60 0.09 0.45 4.05 2.46 Jul-15 15.0% 0.56 5.06 1.64 0.10 0.47 4.20 3.00 Aug-15 13.5% 0.51 4.56 1.67 0.10 0.41 3.68 3.23 Sep-15 10.0% 0.38 3.38 0.95 0.06 0.32 2.88 3.15 Oct-15 7.0% 0.26 2.36 0.92 0.05 0.21 1.88 2.81 Total 100.0% 3.75 33.75 14.06 0.82 2.93 26.37 26.37 Notes: (1)Monthly percentages determined in SB89-120 for elevations below 6,500 feet (2)NOAA Technical Report NWS 33,Evaporation Atlas for the Contiguous 48 United States notes a total gross evaporation of 45.0 inches/year (3)Gross lake evaporation=(2)x total exposed surface area which is equal to 9 acres (4)Based upon the Western Regional Climate Center Station for Brighton,CO(050950)for the time period 1973-2012 (5)Effective precipitation=(4)x 0.7/12 (6)Net monthly evaporation=(2)-(5) (7)Evaporative consumptive use=(6)x total exposed surface area which is equal to 9 acres (8)Reflects lagged depletions due to evaporation,operational uses and past mining activities at the site based on Glover analysis using following parameters: Pre 10/2012 Post 10/2012 X= 4,500 ft X= 2,200 ft T= 170,000 gpd/ft T= 170,000 gpd/ft S= 0.2 S= 0.2 W= 4,700 ft W= 5,200 ft , ti BBA