2009-11-03_HYDROLOGY - M1977036 - Laserfiche WebLink

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Ms. Sira Sartori Greeley (35th Avenue) Pit-M77-036 October 29, 2009 Page 2 The anticipated net depletion for this plan is 88.9 acre-feet per year. You have provided a monthly breakdown of the annual depletions totaling 59.3 acre-feet of evaporative loss, 14.72 acre-feet of water lost with mined product associated with 500,000 tons of aggregate, 6 acre- feet of water used for dust control and 8.8 acre-feet of water used in concrete production to be appropriated from the well permit no. 47856-F. Lafarge filed for water storage right for this site in Case no. 98CW476. The site has been continuously dewatered at a rate of approximately 1200 gallons per minute. The Greeley 35th Avenue Pit is located approximately 250 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. A stream depletion model using the Glover method was used to calculate the lagged depletions to the Cache La Poudre River. The following parameters were used in the model: transmissivity (T) = 120,000 gallons per day per foot, specific yield (SY) 0.2, the distance from the Cache La Poudre River to the edge of the alluvium = 5,000 feet, and the distance from the centroid of the exposed surface water areas to the Cache La Poudre River = 250 feet. The total lagged mining depletions during the SWSP period are 88.7 acre-feet. The total lagged depletions include the 8.8 acre-feet used for concrete production from well permit no. 47856-F and 79.9 acre-feet from the othE'r consumptive uses at the site. Replacements The source of replacement water will be from a lease 125 acre-feet of fully consumable effluent water from the City of Greeley ("Greeley"). Lafarge traded its 550 Boyd and Freeman Ditch shares for 125 acre-feet of augmentation water from Greeley. Fully consumable replacement water is to be provided by Greeley and it will be returned to the river at one of the following locations: a) Greeley Water Pollution Control Facility Outfall located on the Cache La Poudre River; b) JBS Swift Industrial WWTP Outfall on Lone Tree Creek; c) confluence of the 35'h Avenue Drainage Ditch and Cache La Poudre River or any augmentation station/release structure(s) to be constructed in the vicinity of such confluence and associated with Greeley's operation of reservoirs knows as Flatiron Reservoir Nos. 1-5 (a.k.a. Poudre Ponds or Greeley West Pit); d) an augmentation station/release structure located under the Boyd and Freeman Ditch and approved by the water commissioner and division engineer for such purpose; e) release structures from Greeley Canal No. 3 as described in Greeley's decree in case no. 99CW232; or f? any other release and measurement point that Greeley and Lafarge agree upon. The Applicant i;: required to coordinate with the water commissioner the delivery location of replacement water to ensure out-of-priority depletions are adequately replaced to prevent injury to other water rights, Conveyance loss for delivery of augmentation water is subject to assessment and modification as determined by the water commissioner or division engineer. A copy of the lease with the Greeley was submitted to this office with the SWSP request and is attached to this letter. A monthly breakdown of depletions and replacements is shown in the attached Table 3. SWSP Conditions of Approval 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, 2009 and shall be valid through October 31, 2010 unless otherwise revoked or modified. 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 of $257 no later than September 15, 2010.