2008-08-06_HYDROLOGY - M1985112 - Laserfiche WebLink

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Ms. Kimberly K. Frick, P.G. August 4, 2008 Page 2 of 5 Depletions The net evaporation for this site is 2.92 feet per year. The Applicant has estimated that the exposed groundwater, surface area will be 0.23 acres during May through October, when the site is dewatered; and 8.3 acres during November through March, when the dewatering pumps are shut off and the pond is allowed to fill. During this plan period dewatering commenced in April, resulting in an estimated exposed ground water surface area of 4 acres during that month. The estimated consumptive uses at the site during this plan period are: • 5.74 acre-feet for evaporative losses • 1 acre-foot for dust control • 1.62 acre-feet for water lost in product (55,000 tons per year estimated production) • Total Consumptive Use = 8.35 acre-feet • Total Lagged Consumptive Use = 10.97 acre-feet The SWSP accounts for depletions from current and past consumptive use at the Loloff site. The lagged depletions were calculated using an SDF of 60 days. Attached Table 1 specifies the lagged depletions from the evaporation and mining operations. Replacement Sources The replacement sources proposed for this operation include recharge associated with one share of New Cache La Poudre Irrigation Company, the Loloff Section 4 Ditch and leased water from the Lake Canal Company. The applicant proposes to use the Loloff section 4 Ditch conditional water right for replacement purposes, if available. The Loloff Section 4 Ditch collects seepage and waste water in the vicinity of the Loloff Pit in the SW1/4 of the NW1/4 of Section 4, Township 5 North, Range 65 West. The Division 1 Water Court adjudicated a conditional water right for the Loloff Ditch in case no. 87CW152 for up to 4 cfs of water with an appropriation date of March 15, 1987 (administration no. 50112.00000). The decreed uses of the Loloff Ditch include irrigation and augmentation. According to the SWSP request, there is a flume and recorder to measure this water right, which has been approved by the water commissioner. The applicant proposes to use this water right first, if available, since it is a junior water right. The applicant also owns 1 share of New Cache Irrigation Company and will utilize the share under the Lower Poudre Augmentation Company ("LPAC") recharge program. The recharge program is, currently operating under a substitute water supply plan, pending approval of associated water court cases 04CW025 and 06CW295. The New Cache La Poudre Irrigation Company operates the augmentation plan and makes replacements. The amount of recharge water available during this plan period is 3.25 acre-feet.