2009-12-22_HYDROLOGY - M1985112 - Laserfiche WebLink

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Mr. Jared Dains, E.I. December 16, 2009 Page 2 of 5 • 21.02 acre -feet for evaporative losses • 1 acre -foot for dust control • Total Consumptive Use = 22.02 acre -feet • Total Lagged, Consumptive Use = 19.90 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. Because the pit was not dewatered or mined in 2009 as planned, the consumptive uses during 2009 were assumed to equal the consumptive uses for 2010. Attached Table 1 specifies the lagged depletions from the evaporation and mining operations. Replacement Sources The replacement sources proposed for this operation include a lease from the Platte River Power Authority and a lease from Graham Ditch Company. These sources will make the replacement above the headgate of the Ogilvy Ditch. During 2010, a lease of 6.90 acre -feet of fully consumable water provided by the Platte River Power Authority ( "PRPA ") will be used to make replacements during the non - irrigation season (November through March). PRPA has an Agreement dated August 10, 1978 for Reuse of Water for Energy Generation with the City of Fort Collins ( "Fort Collins ") and Water Supply and Storage Company ( "WSSC "). PRPA, Fort Collins, and WSSC also obtain approval of a plan for augmentation including reuse of water in case no. W- 9322 -78. This water right was decreed in case no. W- 9322 -78 as developed water, not tributary to the South Platte River. The Court found that 4,200 acre -feet, or more per year will be available from Fort Collins to the PRPA to be used primarily for cooling purposes in connection with its Rawhide Energy Station. Pursuant to the decree in case no. W- 9322 -78 if PRPA does not require the water for its own purposes, it or Fort Collins or other water users designated by it may utilize the water for any other beneficial purposes including augmentation. In addition, PRPA has entered into an Agreement with the North Poudre Irrigation Company ( "North Poudre") dated November 15, 1979 which grants PRPA to right to store surplus water (which is surplus water beyond the needs of the Rawhide Energy Station) in the Fossil Creek Reservoir and lease such water to others who can use such water from Fossil Creek Reservoir through direct delivery. As required by the Agreement, North Poudre and the water commissioner were informed by the PRPA of the lease with Loloff Construction, Inc. In addition, according to the Agreement releases of leased water to others shall be made in the months of September, October, November, February or March. Since the existing lease will also make replacements for months other than the months listed above, PRPA and North Poudre mutually agreed to lease the water for January and December 2010 and the water commissioner agreed to make the releases during those months. The releases will be made from Fossil Creek Reservoir to the Cache La Poudre River approximately 30.3 miles upstream of the estimated point of depletions from the Loloff Pit. A 7.58 percent (0.25 percent per mile for 30.3 miles) river transit loss is included in the 6.90 acre -feet amount. A copy of the Platte River Power Authority lease was provided to this office with the SWSP renewal request and is attached to this letter. In addition, during 2010, a lease from the Graham Drainage Ditch Company for 14.20 acre -feet of replacement water from the Graham Seepage & Drainage Canal water right will make replacement from April through October. This water right was decreed in case no. W- 7818 as developed water, not tributary to the South Platte River. The Court found that 2,800