2016-02-17_HYDROLOGY - M1996052 - Laserfiche WebLink

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Mr. Rick Parsons, P.E. February 10, 2016 L.G. Everist Combined SWSP Page 4 of 14 Depletions The depletions resulting from evaporation, water lost in product, dust control and concrete production are shown in Table D below: TABLE D - DEPLETION SUMMARY Evaporation Product Dust Control Concrete Total Total Net Loss Moisture Loss Production Depletions Depletions*** Site Name (ac-ft (ac-ft) (ac-ft) (ac-ft) (ac-ft) (ac-ft) 2016 2017 2016 2017 2016 2017 2016 2017 2016 2017 2016 2017 Carbon Valley 7.8 5.9 2.9 1.9 1.0 1.0 0.0 0.0 11.7 8.8 +9.4 -369.7 Pit Rinn Valley Pit 12.4 0.0 10.6 0.0 1.0 0.0 0.7* 0.0 24.8 0.0 -61.3 -11.4 Firestone Pit 42.3 42.3 30.9 30.9 1.0 1.0 12.3** 13.0** 86.6 87.3 -82.1 -74.2 St. Vrain Creek Net Depletions -134.07 455.3 Fort Lupton Sand and 66.7 66.7 41.2 41.2 1.0 1.0 0.0 0.0 108.9 108.9 -96.31 -104.14 Gravel Pit South Platte River Net Depletions -96.31 -104.14 Star Water 6.5 6.5 0.0 0.0 1.0 1.0 0.0 0.0 7.5 7.5 -7.38 -7.45 Resources Cache la Poudre River Net Depletions -7.38 -7.45 * Based on 4,675 tons of concrete production and 50 gallons of water per ton of concrete **Based on 80,325 tons of concrete production for 2016 and 85,000 tons of concrete production for 2017 and 50 gallons of water per ton of concrete ***The total net depletions include accretions credits or depletions from dewatering. The total net depletions for 2016 and 2017 for all pits were taken from Tables 8, 9, 10, 12, and 14 (attached) (+) represent net accretion to river and (-) represent net depletion to river The net evaporation for the Firestone Pit includes a credit of 0.60 acre-feet of consumptive use of ground water associated with the partial subirrigation of the historically irrigated acreage. No other phreatophyte credit was applied to the other sites. Although depletions estimated in this SWSP assume year-round evaporation depletions, computation of evaporation under this plan may be reduced during the ice covered periods, based on average monthly temperatures less than 32°F taken from the Longmont 2ESE weather station for the Saint Wain Pits, the Fort Lupton 2SE station for the South Platte Pits, and the Greeley UNC weather station for the Cache La Poudre site. For the purpose of this SWSP, the Applicant shall replace the net evaporation depletions from the exposed ground water surface area that may occur during the assumed ice covered period for any time that the pits are not completely covered by ice. The accounting for the SWSP shall be based on measurement of actual ice cover. Computation of the net evaporation during any time that the pits are not completely covered by ice shall be determined as the pro-rata amount of the monthly gross evaporation rate distribution amount identified in the State Engineer's General Guidelines for Substitute Supply Plans for Sand and Gravel Pits, subtracting the pro-rata amount of the effective precipitation for that period. The material excavated from the gravel pit areas will be washed on site. The consumptive use of water associated with excavated material is dependent on the location of the material with respect