2012-01-20_HYDROLOGY - M1977036 - Laserfiche WebLink

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Mr. Jared Dains Greeley 35th Ave Pit M- 1977 -036 January 11, 2011 Page 2 gravel pit permit boundary. The anticipated net depletion for this SWSP is 100.51 acre -feet. You have provided a monthly breakdown of the annual depletions totaling 76.84 acre -feet of evaporative loss, 8.83 acre -feet of water lost with mined product associated with 300,000 tons of aggregate, 6 acre - feet of water used for dust control and 8.84 acre -feet of water used in concrete production to be appropriated from the well permit no. 47856 -F (WDID 0307597). Lafarge filed for and has received a conditional water storage right for this site in Case no. 98CW476. The site is assumed to have been continuously dewatered at a rate of approximately 1200 gallons per minute. Although mining activities are projected to finish in May 2012, continuous dewatering activities are anticipated to occur even after mining activities have ceased. To document actual dewatering volumes, the Applicant is required to install a Totalizing Flow Meter on the dewatering lines by February 29, 2012, if not already installed. Monthly volumes shall be reported on the monthly accounting submitted by Applegate. This SWSP 'must be amended 90 -days prior to any cessation or slowing down of dewatering activities to analyze post - pumping lagged depletions and proposed replacement source. The Greeley 35 Avenue Pit depletions must be 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 pit to the Cache La Poudre River = 1,500 feet. The total lagged mining depletions during the SWSP period are 105.60 acre -feet. The total lagged depletions include the 8.84 acre -feet used for concrete production from well permit no. 47856 -F and 91.67 acre - feet from the other 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. Marietta acquired this lease from Lafarge as part of their acquisition of the Greeley 35 Ave Pit. 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 (WDID 0302312) located on the Cache La Poudre River; b) JBS Swift Industrial WWTP Outfall (WDID 0102342) on Lone Tree Creek; c) confluence of the 35 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 Marietta agree upon. The Applicant is 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 Greeley was previously submitted to this office and is attached to this letter. A monthly breakdown of depletions and replacements is shown in the attached Table 3.