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i <br />Richard D. Lamm <br />Governor <br />III IIIIIIIIIIIIIIII <br />DEPARTMENT OF NATURAL RESOURCES <br />David H. Getches, Executive Director <br />MINED LAND RECLAMATION DIVISION <br />DAVID C. SHELTON, Director <br />June 5, 1986 <br />Mr. Richard Mills <br />Senior Environmental Engineer <br />Twentymile Coal Company <br />P.O. Box 748 <br />Oak Creek, Colorado 80467 <br />Re: Review of 1985 AHR - Foidel Creek Mine - File No. C-82-056 <br />Dear Mr. Mills: <br />The Colorado Mined Land Reclamation Division (CMLRD) has reviewed Twentymile <br />Coai Company's (TCC) 1985 Annual Hydrologic Report for Foidel Creek Mine. The <br />review had three major thrusts: an analysis of the legal requirements <br />associated with the hydrologic monitoring, an evaluation of the quality of the <br />data and lastly, an analysis of the data itself and TCC's interpretations. <br />Prior to discussing the report, I would like to commend TCC on the improved <br />formatting of the report over previous reports, and the apparent commitment to <br />analyzing the existing and historical hydrologic balance in the valley. <br />Legal Requirements <br />The specific terms of the hydrologic monitoring plan are delineated in <br />Exhibit 10 of Permit C-82-056, stipulations 4 and 5 of the CMLRD findings <br />document and CDPS Permit 0027154. TCC provided information from alt required <br />sites, assuming that they intended to substitute shallow aquifer well site <br />006-AY-1 for 006-AW-1 and discharge information from surface water site 2005 <br />for site 8. Additional information was submitted for some Fish Creek Tipple <br />monitoring sites and surface water site a (upstream on Foidel Creek draining <br />lands unaffected by mining) and USGS site 09243900 (downstream on Foidel <br />Creek). The Foidel Creek sites were useful supplements which provided <br />perspective on baseline information. The frequency and breadth of monitoring <br />met the legal requirements from June through December following the issuance <br />of NOV's C-85-012 and C-85-039 during the first half of the year. <br />vo <br />423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (303) 866-3567 <br />