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<br />1 <br />1 <br /> <br /> <br /> <br /> <br /> <br /> <br />STnTE OL COLI~n nD( <br />DEPARTMENT OF NAT URA~RE SOURCES <br />D Monts PUeoe. E.ec ubve Duecto~ <br />MINED LAND ItECLAMAI'ION <br />423 Centennial Building. 1313 Sherman Street <br />Denver. Colorado 80203 Tel. (303) 8663567 <br />January 13, 1982 <br />Mr. Larry Reschke <br />Grand Mesa Coal Company <br />P. O. Box 226, 1st and Columbia <br />Delta, Colorado 82426 <br />Re: Grand Mesa Permit Application - Red Canyon Mine <br />Our File too. C-034-81 <br />Dear Mr. Reschke: <br />Davfd C. Shelton <br />Director <br />Portions of the Red Canyon mine application revision, submitted to the <br />Division on August 31, 1981, have been reviewed. As I have indicated <br />to you by phone,~significant problems still remain with respect to <br />surface and ground water and the impact of mining on alluvial valley <br />floors. <br />Rydrologic 3alance: Surface water (Rules 2.04.5, 2.04.7, 2.05.3(4), <br />2.05.6(3), and 4.05) <br />The following deficiencies have been identified and must be corrected <br />prior to permit approval: <br />' 1) The applicant's discussion of probable Hydrologic Consequences does <br />not include a discussion of possible surface water effects. Some surface <br />water effects would be expected because direct recharge from the stream <br />' is expected to make up any water loss from the alluvial aquifer resulting <br />from mining. If this recharge occurs, surface flows should be decreased. <br />The applicant should expand the discussion of Probable Hydrologic Conse- pp. 36-38, <br />quences to include a quantitative assessment of effects on the quantity p. 62 <br />' of surface waters on a seasonal basis. Doth ward Creek and the irrigation <br />system could be affected. <br />' 2) Given the potential For affecting surface flow in Ward Creek, the <br />surface water baseline provided by rite applicant is not adequate. Two <br />monitoring stations should be established on ward Creek above and below P. 37, <br />the permit area. These stations should be equipped with conrint~nris flow PP• 7-71 <br />' recorders. The applicant should also obtain flow information on major <br />irrigation ditches overlying the proposed underground workings. Permit <br />review may fie suspended until the applicant provides data which identify <br />' critical low flow and peak discharge rates of streams sufficient to <br />identify seasonal variations. <br />1 <br />3 <br />1 <br />