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'-6 <br />q' <br />3 <br />5 <br />psi a <br />v? <br />o! <br />3 <br />Mr. Jared Dains, E.I. <br />February 9, 2011 <br />Page 2 of 6 <br />exposure of ground water. The DRMS letter identifies four approaches to satisfy this <br />requirement. If the information you are providing to DRMS is included under the <br />approaches numbered 1 - 3, a copy of that information needs to also be provided to this <br />office (the Division of Water Resources). <br />If the information you are providing to DRMS is pursuant to approach no. 4, you <br />will need to provide additional documentation to this office that specifies what water <br />rights or other permanent water source will be dedicated to the SWSP to assure that all <br />permanent depletions from either an unforeseen abandonment of the site by the <br />Applicant or as a result of long term ground water exposure after completion of mining <br />and reclamation will be replaced so as to prevent injury to other water rights. <br />This Information must be provided to this office by April 30, 2011. If the requested <br />information is not provided to the Division of Water Resources, any future SWSP may <br />limit the mining operation so that additional ground water cannot be exposed, beyond <br />that specified in this SWSP. <br />Depletions <br />Depletions at the site during this plan period will consist of evaporative losses and <br />operational losses. The current amount of exposed ground water at the Loloff Pit is 10.5 acres, <br />which is anticipated to remain constant throughout this plan period. Net evaporative depletions <br />were calculated using a gross annual evaporation of 45 inches from the exposed water surface, <br />with a credit of 9.97 inches for effective precipitation. No credit was claimed for ice cover <br />periods. The net depletion of ground water due to evaporation from the 10.5 acres of exposed <br />ground water surface was calculated to be 30.66 acre-feet for this plan year. The Applicant has <br />estimated that a total of 1.00 acre-foot of water will be used for dust control purposes during this <br />plan period. <br />, <br />The <br />U11 ftarAeAeous. A stream depletion model based on the <br />Stream Depletion Factor (SDF) technique was used to calculate the lagged depletions to the <br />Cache La Poudre River. An SDF of 60 days was used for the Loloff Pit site. The total lagged <br />depletions for this plan period due to both projected and.past consumptive use at the site were <br />estimated to be 26.49 acre-feet, as shown on Table 1. <br />Replacement Sources <br />Two replacement sources are proposed to replace depletions from the Loloff Pit. An 8.5 <br />acre-foot lease of augmentation water from the Platte River Power Authority will provide <br />replacement water during the months of January, February, March, November, and December <br />2011. A 19.3 acre-foot lease of augmentation water from the Graham Drainage Ditch Company <br />will supply replacement water during the months of April through October 2011. Both sources will <br />deliver replacements above the headgate of the Ogilvy Ditch, which is the first calling water right <br />below the Loloff Pit point of depletion. <br />A lease of 8.5 acre-feet of fully consumable water provided by the Platte River Power <br />Authority ("PRPA") will be used to make replacements during the non-irrigation season (January, <br />February, March, November, and December 2011). PRPA has an "Agreement for the Reuse of <br />Water for Energy Generation", dated August 10, 1978, with the City of Fort Collins ("Fort Collins") <br />and Water Supply and Storage Company ("WSSC") that provides PRPA with the right to receive <br />