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Table 1Brighton PitEvaporative and Operational LossesMonthPercent of Evaporation Gross EvaporationAverage Precipitation Effective Precipitation Net EvaporationNet Water Surface Evaporation TrenchesNet Water Surface Evaporation Ponds0.00 Acres 0.00 Acres(inches) (inches) (inches) (inches) (acre-feet) (acre-feet)(1) (2) (3) (4) (5) (6a) (6b)Jan-193.0% 1.37 0.48 0.34 1.03 0.00 0.00Feb-193.5% 1.59 0.41 0.29 1.31 0.00 0.00Mar-195.5% 2.50 1.26 0.88 1.62 0.00 0.00Apr-199.0% 4.10 1.56 1.09 3.00 0.00 0.00May-1912.0% 5.46 2.56 1.79 3.67 0.00 0.00Jun-1914.5% 6.60 1.84 1.29 5.31 0.00 0.00Jul-1915.0% 6.83 1.55 1.09 5.74 0.00 0.00Aug-1913.5% 6.14 1.53 1.07 5.07 0.00 0.00Sep-1910.0% 4.55 1.01 0.71 3.84 0.00 0.00Oct-197.0% 3.19 0.87 0.61 2.58 0.00 0.00Nov-194.0% 1.82 0.93 0.65 1.17 0.00 0.00Dec-193.0% 1.37 0.55 0.39 0.98 0.00 0.00Total 100.0% 45.50 14.55 10.19 35.32 0.00 0.00MonthPercent of Annual Aggregate ProductionAmount of Aggregate ProductionWater Lost with Mined ProductPercent of Annual Concrete ProductionAmount of Concrete ProductionWater Used in Concrete BatchingWater Used for Dust ControlTotal Evaporation & Operational LossesLagged Pond Use (Evap, Mine, Dust)Lagged Well Use (Concrete)Lagged Evaporation & Operational Losses(tons) (acre-feet) (cubic yards) (acre-feet) (acre-feet) (acre-feet) (acre-feet) (acre-feet) (acre-feet)(7) (8) (9) (10) (11) (12) (13) (14) (15) (16) (17)Jan-195.1% 0 0.00 5.1% 0 0.00 0.00 0.00 -1.69 -0.99 -2.68Feb-194.9% 0 0.00 4.9% 0 0.00 0.00 0.00 -1.54 -0.88 -2.42Mar-1912.1% 0 0.00 12.1% 0 0.00 0.00 0.00 -1.45 -0.83 -2.28Apr-1910.5% 0 0.00 10.5% 0 0.00 0.00 0.00 -1.45 -0.88 -2.33May-1910.5% 0 0.00 10.5% 0 0.00 0.00 0.00 -1.55 -0.98 -2.53Jun-1910.0% 0 0.00 10.0% 0 0.00 0.00 0.00 -1.71 -1.10 -2.81Jul-199.3% 0 0.00 9.3% 0 0.00 0.00 0.00 -1.94 -1.22 -3.17Aug-1910.1% 0 0.00 10.1% 0 0.00 0.00 0.00 -1.89 -1.33 -3.22Sep-199.8% 0 0.00 9.8% 0 0.00 0.00 0.00 -2.26 -1.33 -3.59Oct-197.7% 0 0.00 7.7% 0 0.00 0.00 0.00 -2.23 -1.36 -3.59Nov-194.9% 0 0.00 4.9% 0 0.00 0.00 0.00 -2.10 -1.34 -3.43Dec-194.9% 0 0.00 4.9% 0 0.00 0.00 0.00 -1.89 -1.26 -3.15Total 100.0% 0 0.00 100.0% 0 0.00 0.00 0.00 -21.69 -13.51 -35.20(1) From SB 120, the evaporation percentages are for gravel pits with elevations below 6,500 feet(2) Equals Percent of Annual Evaporation times 45.5 inches(3) From Colorado State University's Colorado Climate Center web page, http://ccc.atmos.colostate.edu for Brighton Weather Station(4) Equals Column (3) x 0.70. 70 percent value was taken from SB 120(5) Equals Column (2) - Column (4). If the resultant value is less than zero then a zero is substituted(6a) Equals Column (5)/12 x acres for de-water trenches .(6b) Equals Column (5)/12 x acres for silt ponds.(7) Based on information from Bestway.(8) Equals Column (7) x tons per year. Production based on information from Bestway. This is production from the mining operation on the West Site(9) Equals Column (8) times 2000 times 4% divided by 62.4 divided by 43,560(10) Based on information from Bestway.(11) Equals Column (10) times cubic yards per year. Production based on information from Bestway(12) Equals Column (11) times 40 gallons divided by 325851. Assume a use of 50 gallons per cubic yard of concrete production(13) Equals 6000 gallons per day times number of operating days (20 days) in the month divided by 325851, during production months (March thru November)(14) Equals column (6a) + Column (6b) + Column (9) + Column (12) + Column (13)(15) From SDF depletion model - prorated for 3 years to replace final depletions(16) From SDF depletion model - prorated for 3 years to replace final depletions(17) Total lagged evaporative and operational losses (from AWAS). Total of Column (15) + Column (16)3/12/2019J:\HallIrwin-105\Water Resources\Gravel Pits Civil Resources\BrightonSWSP-Civil Resources\2019 SWSP-Brighton\BrightonSWSP_19_including litvak_FD2.xls