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Kattenburg Pit SWSP <br /> September 26, 2024 <br /> Page 4 of 11 <br /> site. Evaporation and all operational water is assumed to be fully consumed. <br /> Total Consumptive Use <br /> The total anticipated consumptive use at the Kattenburg Pit during the requested approval <br /> period is estimated to be 3.94 acre-feet per year, and 7.88 acre-feet total for the two year <br /> SWSP plan period, as shown in Table 1. Due to the location of the Kattenburg Pit mining <br /> operation, stream depletions resulting from evaporation of the exposed groundwater and <br /> pumping of water from the proposed well, do not instantaneously affect the Fraser River but <br /> instead result in lagged depletions. A Glover lagging model was constructed for the exposed <br /> groundwater using the following lagging parameters: <br /> • Distance from pit to stream (X) = 2,300 feet (measured from pit centroid to <br /> stream) <br /> • Aquifer Transmissivity (T) = 12,000 gallons per day per foot (per Geological <br /> Survey Water-Supply Paper 1809-G "Ground-Water Resources of North Park and <br /> Middle Park Colorado - A Reconnaissance) <br /> • Specific Yield (S) = 0.2 (assumed) <br /> • Aquifer Width (W) = 2,800 feet (measured from river to edge of pit through pit <br /> centroid) <br /> After review of the proposed parameters by the Division of Water Resources' Hydrogeology <br /> group, the following parameters are approved for use in this SWSP: <br /> Evaporation from exposed groundwater: Drilled well: <br /> T = 12,000 gal/day/ft T = 12,000 gal/day/ft <br /> s = 0.2 s = 0.2 <br />