2007-09-11_REVISION - M1997054 (2)

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Operational Consumptive Use Operational losses at the site consist of water lost in product hauled off-site and water used for dust control. The maximum annual gravel mine production is estimated 2,800,000 tons of raw material. However, only 750,000 tons of the raw material is washed. The remainder is dry screened and therefore retained moisture in the dry screened product is negligible. The moisture content of the material hauled off-site was assumed to be four percent by weight. Operations at the quarry will not expose groundwater nor will any water be used for product washing. However, a NESCO (National Environmental Service Company) Dust Suppression System will be employed during the operation. The sand and gravel operation dust control system applies water at a rate of 1.43 gallons per minute with an estimated operation of 2,500 hours per year, equaling 9.2 acre-feet of water per year. The quarry will use an estimated 7.4 acre-feet of water for 2,000 hours of dust control operation per year. The total volume used for dust control is 16.6 acre-feet. The total annual consumptive use for the sand and gravel operation and the quarry is 43.63 acre- feet. The total annual consumptive uses associated with the mining operations are as follows: Net annual Evaporation (acre- eet/acre o exposed groundwater) 4.96 Moisture Retained in Product (acre- eet/year) 22.08 Dust Control (acre- eet) 16.60 Total (acre-feet) 43.63 REPLACEMENT WATER The replacement of consumptive uses will be accounted for in a Substitute Water Supply Plan (SWSP) that is administered by the State Engineer. The following sources will be utilized to provide the necessary replacement water for the site during the first year of operations: • Board of Water Works of Pueblo (BWW): A 10-year lease of 50 acre-feet per year from the BWW will be used for replacement water during mining operations. When adequate exchange potential exists to make that replacement water available at the project site, the BWW water will be supplied at the City of Pueblo wastewater treatment plant, located east of Pueblo. When there is insufficient exchange potential to utilize reusable effluent, Pueblo will release water from upstream storage at Cleaz Creek Reservoir or Twin Lakes Reservoir, or the applicant may release water from Twin Lakes Reservoir to augment the Parkdale Project site. The BWW lease expires on April 1, 2011. • Twin Lake Reservon~ and Canal Company: Five Twin Lakes Reservoir & Canal Company Shares, 3.5 acre-feet of credit, will be used if BWW is unable to supply water from the upper Arkansas River sources. • Canon City Water Department (Canon City): A lease of 50 acre-feet of raw water annually, may be used to supplement the previously mentioned replacement water sources. The lease agreement is valid until January 2035. Front Range Aggregates, LLC- Par/ulale Quarry DMG l12 Permit Amendment Page 26