2009-02-04_HYDROLOGY - M1982131 - Laserfiche WebLink

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Mr. Jared Dains Page 2 January 27, 2009 have assumed the ice covered period to occur during the months of December and January, based on the average monthly temperatures being below freezing (using data taken from the Greeley weather station for the time period from 1967 through 2005). However, 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 (December and January) for any time that the pit is not completely covered by ice. Computation of the net evaporation during any time that the pit is 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. You have provided a monthly breakdown of the annual depletions totaling 34.60 acre-feet of evaporative loss from 12.54 acre of exposed surface area, 4.51 acre-feet of water used and consumed for dust control, and 2.94 acre-feet of water lost with 200,000 tons of mined product. Prior to dewatering, the material to be mined was located below the water table; however since this site has been dewatered, the material:to be mined will be in a dewatered state. Since the material will not be washed, pursuant to the' State Engineer's Guidelines for Substitute Water Supply Plan for Sand and Gravel Pits, the assumed moisture content is 2% by weight. Note, that4ue to a change in administration of evaporation from ground water exposed to the atmosphere priof.to 1981, pre-1981 credits will no longer be allowed for gravel pits which exposed ground water to the atmosphere prior to 1981 and were actively mined on or after January 1, 1981. Accordingly, evaporative depletions for such gravel pits will need to be replaced from the entire surface area of the ground water exposed in the pits. In order to allow owners and operators of the affected pits time to comply with this change in the administration requirements, the owners and operators will have until January 1, 2010 to comply with the replacement requirements. The Applicant is hereby notified that the no credit from the 5.27 acres of ground water exposed prior to 1981 will be given after January 1, 2010 and evaporation from the 5.27 acres must be replaced in any subsequent SWSP renewal for this pit if this area is connected to the acreage exposed after December 31, 1980. Replacements The sources of replacement water to be used for this plan will be from five shares of the Greeley Irrigation Company ("GIC"). A portion of the GIC was changed in Division 1 Water Court case no. 96CW658. The applicant's GIC shares will be delivered to the Cache La Poudre River at the 23`d Avenue and Fourth Street Return Station. Those replacements will be made directly adjacent to the Bucklen Pit. Due to close proximity of the return station to the Bucklen Pit, no transit losses will be assessed to the delivery of the GIC shares. A portion of the Greeley Canal No. 3 was changed in Division 1 Water Court in case no. 96CW658 based on a ditch-wide analysis by the Poudre Prairie Mutual Reservoir and Irrigation Company. The use of the subject ditch shares in this plan shall be in accordance with the terms and conditions decreed in case no. 1996CW658, including monthly and annual volumetric limits on water deliveries and monthly return flow requirements. The decree in case no. 1996CW658 found that 519.7 shares were used to irrigate 3,501 acres with an average historic consumptive use of 5,358 acre-feet per year, which yields an average consumptive use credit of 10.31 acre-feet per share (5,358 acre-feet/519.7 shares).