2008-09-23_HYDROLOGY - M1999098 - Laserfiche WebLink

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Kimberly K. Frick Page 2 September 22, 2008 of aggregate and 2 acre-feet of dust control. These depletions have been lagged to the Cache La Poudre River and they are 17.69 acre-feet. The estimated depletions are based upon groundwater evaporation, water in mined product, and dust control. No groundwater will be used for equipment washing, concrete production, reclamation, or any other purpose. Replacements The proposed source of replacement water for this pit during the irrigation season (April through September) is historical consumptive use credit from 2.5 shares of the Whitney Ditch (WDID No. 0300930). All of this ditch interest will be dedicated to this plan. A total of 40 shares of the Whitney Ditch were recently changed in case no. 2002CW390 that was approved by the water court on September 26, 2007. As in case no. 2002CW390, this plan will estimate ditch loss to be 15 percent, a maximum farm irrigation efficiency of 60% will be used, and a return flow split of 50/50 between surface and subsurface return flows will be used. The 2.5 shares were historically used for the irrigation of 24 acres. The attached Table 3 summarizes the consumptive use analysis for the 2.5 Whitney Ditch shares that were used on the 24 acre property. The total net consumptive use available for the dry-up of this 24-acre property is 37.3 acre-feet. The return flow of the 2.5 Whitney Ditch shares will be maintained by this plan. The remainder of the replacement water for this pit during both the irrigation and non-irrigation season is a lease of fully consumable water from excess South Platte Combined Replacement Plan. This water comes from a combination of sources, effluent from the City of Westminster (275 acre- feet), effluent from the City of Thornton (10.5 acre-feet), and 30 acre-feet from the City of Centennial. The leased water will be delivered to the South Platte River at the Metro wastewater treatment plant or the Big Dry Creek wastewater treatment plant located upstream of the confluence with the Poudre. A transit loss of 0.5% per mile has been applied to the projected depletions due to the location of the replacement delivery. The monthly depletions and replacement requirements are found on the attached Table 4. Note that only water rights decreed for augmentation purposes may be used in this plan. Conditions of Approval As required by Section 8 of Senate Bill 89-120, this SWSP has been provided to an outside consultant for review. The consultant has recommended approval of the plan by way of a draft of this letter. Based upon statutory requirements and the recommendations of the consultant, 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 SWSP shall be valid for the period of January 1, 2009 through December 31, 2009, unless otherwise revoked, modified, or superseded by decree. If this plan will not be made absolute by a water court action by the plan's expiration date, a renewal request must be submitted to this office with the statutory fee (currently $257) no later than November 1, 2009. 2. Prior to operation of the gravel pit pursuant to this plan, the Applicant must obtain a new well permit for the exposure of ground water and the uses described herein in accordance with §37-90-137(2) and (11), C.R.S. Once a permit is obtained, the Applicant must provide all follow up documentation and forms necessary to keep the permit valid. The provisions of §37-90-137(2) prohibit the issuance of a permit for a well to be located