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DeBeque Gravel Pit SWSP Page 4 of 10 <br /> August 7, 2025 <br /> Intermittent Fill <br /> While actively mining, water will be pumped into a dewatering sump at a rate of 1,500 gpm <br /> located in the northwest corner of the gravel pit. The discharge point is also located in the <br /> northwest corner of the gravel pit. While dewatering will generally occur at a steady rate, <br /> there may be times during which the rate of groundwater infill will exceed the rate of <br /> dewatering, which will be replaced under this SWSP. The pit will be dewatered at a faster <br /> rate than the pit fills until November, after which there is not anticipated to be a call for <br /> several months. The Applicant estimates that the maximum pit volume is 52.0 acre-feet of <br /> water. At an estimated inflow rate of 500 gpm, the pit will fill in 24 days. The estimated <br /> water lost due to infill is 52.0 acre-feet per year, or 104 acre-feet for this SWSP period, <br /> as shown on attached Table 3. <br /> Total Depletions <br /> Total depletions are 84.23 acre-feet per year, or 168.46 acre-feet for this SWSP period, <br /> as shown on attached Table 4. <br /> Laeeed Depletions <br /> Lagged depletions were determined using a Glover analysis and parameters from the <br /> Debeque Gravil Pit decree approved in case no. 05CW76, which are summarized below: <br /> • Infinite Aquifer boundary condition, <br /> • Transmissivity = 50,880 gallons per day per foot, <br /> • Specific yield = 0.20, <br /> • Distance from the river to the edge of lake + from the edge of lake to the centroid of <br /> the pit (X) = 906 feet, and <br /> • Distance from the stream to the now-flow boundary = 2,000 feet. <br />