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DeBeque Gravel Pit SWSP Page 2 of 10 <br /> August 7, 2025 <br /> requires that the Applicant provide information to DRMS to demonstrate the ability to <br /> replace long-term injurious stream depletions that result from mining related exposure of <br /> groundwater. In accordance with approach nos. 1 and 3, the Applicant has indicated that a <br /> bond has been obtained for $958,942 through DRMS to ensure that depletions from <br /> groundwater evaporation do not occur in the unforeseen event or events that would lead to <br /> the abandonment of the Pit. <br /> SWSP Operations <br /> This SWSP seeks to replace depletions resulting from mining operations at the DeBeque <br /> Gravel Pit, DRMS File no. M-2011-054, which is located in the N '/z of Section 9, Township 9 <br /> South, Range 97 West, 6tn P.M., in Mesa County, as shown on attached Figures 1 and 2. The <br /> complete life span of the proposed gravel operation is approximately 21 years. The <br /> depletions that result from the mining operations are evaporation from exposed <br /> groundwater, dust suppression, water lost with mined product, and intermittent filling of the <br /> gravel pond. The source of replacement water is water leased from the Colorado River Water <br /> Conservancy District (CRWCD) and the West Divide Water Conservancy District (WDWCD). <br /> Depletions <br /> Evaporation <br /> During this SWSP approval period, a maximum of 9.43 acres' of groundwater from the mined <br /> area (which includes an approximately 0.42-acre groundwater settling pond in the <br /> northwest portion of the DRMS permit area) will be exposed. Gross annual evaporation at the <br /> gravel pit location is estimated to be 47.0 inches per year and the monthly distribution is as <br /> depicted on the attached Table 1. Net evaporation is defined as gross evaporation less the <br /> consumptive use of water by vegetation that naturally occurred at the site prior to <br /> construction of the pit. The historical consumptive use was assumed to be equal to the <br /> effective precipitation of 6.99 inches, which was estimated based on the data from the <br /> 1 An increase from the previously approved 8.72 acres for this SWSP period. <br />