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<br />December 29, 1981 <br />DtC 2 ~ i981 <br />Mined Land Reclamation <br />Colorado Department of <br />1313 Sherman Street <br />Denver, Colorado 80203 <br />Division <br />Natural Resources <br />Gentlemen: <br />III IIIIIIIIIIIIIIII <br /> <br />fJiiN~D LAtiD R~CLAi~hA I ION <br />Colo. Dept. of `!atural P.cso.!rce~ <br />This letter is to provide requested information regarding consumptive <br />use of tributary ground water at the Coors Keenesburg Coal Mine, Weld <br />County, Colorado. This information and proposed replacement program is <br />being submitted pursuant to the terms of the Mined Land Reclamation Board <br />Mining Permit C-028-81 issued on November 3, 1981. <br />We have determined that up to 75.5 of of consumptive use will occur <br />from tributary sources during the first year of mine life. In subsequent <br />years the consumptive use should decrease to about 35.5 of annually. Con- <br />versely, Coors will be returning about 25.4 of annually to the South Platte <br />River system by virtue of irrigation application to reclamation parcels. <br />Consequently, the net depletion to the stream system will be about 50.1 of <br />and 10.1 af, respectively, during the initial year of mining and subsequent <br />years. <br />I propose to replace the estimated depletions by joining the Colorado <br />State Engineer sanctioned augmentation plan operated by the Ground Water <br />Appropriators of the South Platte, Inc. (GASP). GASP indicates that Coors <br />may contract with that organization for replacement of Keenesburg Mine <br />depletions. The appropriate contract documents have been submitted to <br />GASP and copies are attached. <br />During the first year of the mine life, the initial pits will intercept <br />about 70 af, an amount estimated by Dr. Dave McWorter of Colorado State <br />University in studies conducted for Coors preparatory to the permitting. <br />According to McWorter, inflows should diminish after the first year to <br />about 30 af. <br />~ i <br />