2007-10-26_REVISION - M1980110 - Laserfiche WebLink

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Mining Production & Operations: Hall-Irwin expects to extract a maximum of 500,000 tons annually of aggregate material from the site. The water retained in the 500,000 tons will be replaced pursuant to the Substitute Water Supply Plan (SWSP). The total annual amount of water retained in the gravel product from mining activities totals 14.71 acre-feet. In addition, an estimated 3.31 acre-feet of water per year will be used for dust control based (approximately) on 6,000 gallons per day for 20 days per month for 9 months. Annually the total evaporative and operational losses from mining activities (open water surface evaporation, water retained in the aggregate product, dust suppression) totals 34.95 acre-feet of depletion which must be augmented. All depletions were lagged to the Cache La Poudre River using the lagging factors approved by the State Engineer pursuant to on- going Substitute Water Supply (SWSP) approvals. (e) Indicate the projected amounts of the water sources to supply project water requirements Replacement Water: The source of replacement water for depletions will be shares, owned by Hall-Irwin Corporation, of the Whitney Ditch and Kern Ditch and Reservoir Company. The State Engineer must approve a SWSP every two years. These approvals require that the applicant provide a detailed explanation of the mining operations, a quantification of all mining activities and subsequent depletions and all legally available replacement sources. (f) Affirmatively state that the Applicant has acquired or applied for a National Pollutant Discharge Elimination System permit from the Water Quality Control Division The Operator will apply for a National Pollutant Discharge Elimination System (NPDES) permit from the Water Quality Control Division of the Colorado Department of Public Health and Environment prior to discharging water from the site. Hall-Irwin Corporation -Long Resource - MLRB 112 Permit Application Exhibit G - 2