2005-11-28_HYDROLOGY - M1983067 - Laserfiche WebLink

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Michelle L. Austin November 25, 2005 Depletions Paget The total annual losses resulting from evaporation, water lost in product, dust control and concrete hatching are shown in the following table: TABLE B -LOSSES Site Name Evaporation Losses ac-ft Lost in Product ac-ft Dust Control ac-ft Concrete 13atching ac-ft Total (ac-ft) Howe Pit 0 19.87 4 12.8 36.67 Tanabe Pit 29.3 0 0 0 29.3 Dunes Develo ment 9.04 58.9 2 0 69.89 Mann Lakes 71.13 6.62 2.97 0 80.72 Ft. Lu ton Pit 11.8 0 0 0 11.8 Riverbend O eration 0 0 0 0 0 Sta ecoach Sto Pro a 12.9 14.7 2 0 29.6 A slurry wall will be installed around the Stagecoach Stop Property so that the site will be seated from the tributary groundwater. During the first two months of the mining operation the pit will be dewatered and the water will be used to construct the slung wall. Approximately 61 acre-feet of water will be pumped and used in the slurry wall construction in the first two months, or approximately 30.5 acre-feet per month during October 2005 and November 2005. All process water for the Stagecoach Stop Properly will be pumped from a new proposed well located inside the mining permit boundary but outside of the slurry wall. The water from the well will be pumped into a small lined wash pond inside the scurry wall lined pit. You have assumed that the process water is 100°~ consumed. A monthly breakdown of the lagged mining depletions are shown in the attached Table 1. Replacements The proposes sources of replacement water are 25 shares of Fulton Ditch and fully consumable water leased from the City of Greeley, Consolidated Mutual Water Company and Saint Vrain Left Hand Water Conservancy District. The Fulton Ditch water will be recharged into Zigan Reservoir which is a reclaimed gravel pit located in Section 35, Township 1 South, Range 67 West, 6'" P.M. The plan will also account for the impacts and credits from the dewatering at the Stagecoach pit. The plan estimates that dewatering will occur for 8 hours per day, 365 days per year at a rate of 1,000 gpm. See attached Appendix C for the estimated credit and depletions from dewatering. The historic use of the 25 Fulton ditch shares yields 43.89 acre-feet of water during April through October while generating 5.25 acre-feet of return flow obligation during November through March. This quantification is based on the technique used in the March 24, 1999 approval for the Fulton Lakes Pit, where the historic consumptive use values were determined using an analysis decreed in case number 82CW393. In this approach, headgate diversions were based on average monthly values for the period of 1976-1988 and a 10% conveyance loss was assumed as well as a farm efficiency of 50%. The return flow obligations, which were not addressed in the above decree, were calculated for this plan based on the assumption that all ..s.