2008-10-15_HYDROLOGY - M1981022 - Laserfiche WebLink

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Mr. Richard Raines Page 2 G.L. Pit Substitute Water Supply Plan (DRMS# M-81-022) October 7, 2008 an evaporative value of 27.36 inches. The evaporative depletions from the 0.9 acres are 2.1 acre- feet. The G. L. Pit is located approximately 1700 feet from the Cache La Poudre River, thus depletions were not assumed to be instantaneous and have been lagged back to the Cache La Poudre River. You have provided a monthly breakdown of the annual lagged depletions totaling 9.8 acre-feet of evaporative loss. The proposed source of replacement water for this pit is a lease of 10.5 acre-feet of fully consumable water from the Tri-Districts. The lease is for the period of November 2008 through October 2009. A copy of the Tri-Districts lease was provided to this office on September 25, 2008 and is attached to this letter. The replacement water will originate from Sand Creek Ditch, which can only deliver transbasin water to Eaton Reservoir during the warm months of the year. The Tri- Districts have water stored in low elevation reservoirs to make replacement during all month of the year in coordination with the Poudre River water commissioner. The amount of replacement water leased from the Tri-Districts also includes a 7.8 percent transit loss from the Sand Creek Ditch. The transbasin Sand Creek Ditch water is transported over Boulder Ridge in the Wilson Ditch and stored in the Eaton Reservoir. Releases made from Eaton Reservoir travel approximately 50 miles to the mouth of the Poudre Canyon. The monthly depletions and replacement requirements are found on the attached Table I. I hereby approve the proposed substitute water supply plan in accordance with §37-90- 137(11), C.R.S., subject to the following conditions: 1. This plan is approved with the effective date of November 1, 2008 and shall be valid through October 31, 2009 unless otherwise revoked or modified. If the groundwater pond has not been completely backfilled and lagged depletions to the stream system have not ceased by the plan's expiration date, a renewal request must be submitted to this office with the statutory fee (currently $257). no later than September 15, 2009. 2. Well permit no. 42334-F was obtained for the current use and exposed pond surface area of the gravel pit, in accordance with §37-90-137(2) and (11), C.R.S. Applicant shall operate the gravel pit in accordance with the conditions of approval of permit no. 42334-F. 3. The total surface area of exposed groundwater must not exceed 6.4 acres resulting in 9.8 acre-feet of evaporative loss. Should the total consumption at the pit exceed this amount, an amendment will need to be filed with this office. 4. Approval of this plan is for the purpose as stated herein. Any additional uses for which the water may be used must first be approved by this office. 5. All releases of replacement water must be sufficient to cover all out-of-priority depletions in time, place, and amount and must be made under the direction and/or the approval of the water commissioner. The release of replacement water may be aggregated to maximize beneficial use. The water commissioner and/or the division engineer shall determine the rate and timing of an aggregated release. 6. The replacement water that is the subject of this plan cannot be sold or leased to any other entity. As a condition of. subsequent renewals of this substitute water supply plan, the replacement water must be appurtenant to this site until the groundwater pond has been