2022-11-07_PERMIT FILE - M2022001 (7)

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precipitation, that part of historical precipitation which was consumed by native vegetation on land to be covered by water surface, is conservatively estimated to be 70 percent of the total precipitation. The annual average effective precipitation at the property is estimated to be 9.09 inches. When subtracting the effective precipitation from the gross evaporation yields, the net annual evaporation is 31.44 inches, or 2.68 acre-feet per acre. The Fresh Water Pond is approximately 10 acres and the Siltation Pond will be utilized in 10 acre stages. The approximate acreage of open water surface is 20.5 acres. The annual amount of evaporation from open water surfaces is 54.9 acre-feet. Mining Production &Operations: The Operator expects to extract approximately 2 million tons annually of aggregate material from the site. All water retained in the recovered material 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 approximately 27.2 acre-feet. The SWSP is renewed annually and will reflect analysis of production and depletion anticipated in each year of operation. In addition, an estimated 4.0 acre-feet of water per year will be used for dust control based (approximately) on 5,900 gallons per day for 5 days a week for 10 months. Annually the total evaporative and operational losses from mining activities (open water surface evaporation, water retained in the aggregate product, dust suppression)totals 86.1 acre-feet of depletion which must be augmented. All depletions were lagged to the Saint Vrain 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 Miner will obtain an approved Substitute Water Supply Plan from the State Engineers office every year, providing annually or more frequently the opportunity to review the sufficiency of water supplies. The SWSP 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. Red Tierra Equities, LLC—Section 20 Mine—MLRB 112 Permit Application Exhibit G-2