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III IIIIIIIIIIIII III <br /> CG : <br /> eAlveD <br /> A <br /> April7, 1999 <br /> Ms. Christina L. Kamnikar RECE1 <br /> Division of Minerals and Geology VED <br /> 1313 Sherman Street, Room 215 APR 12 egg <br /> Denver, CO 80203 9 <br /> RE: Technical Revision to Permit No. M-74-052 Divis!,.n ur mtrer"d Geology <br /> Weld County, Colorado <br /> CGRS No. 1-135-2755 <br /> Dear Ms. Karnnikar: <br /> The purpose of this letter is to respond to your letter dated February 4, 1999, regarding our <br /> proposal for performing a pilot gravel quarry reclamation project utilizing coal ash in saturated <br /> conditions. Your letter is attached for reference. I have provided two copies of our finalized <br /> Work Plan, which details our proposal. My comments to your issues are provided below. <br /> 1 - We agree that background water quality should be established prior to placing a<r;, <br /> �-nmterials ut saturate conditions. We believe that obtaining background samples on dire <br /> Ia casions between one and three months apart should provide sufficient background <br /> water quality data. The natural variations of major and minor elements of concern in thi^ <br /> project should have relatively minor seasonal variations. In addition, the project entiils <br /> providing background water quality during the project by placing a well sufficiently <br /> upgrcd:ent of the coal ash trenSh to preclude impact from the coal ash. This will provide <br /> ongoing background ito <br /> data Ww ich impacts or degradation of groundwater quality can be <br /> assessed. We feel the five quarters of pre-monring is time co fsurnmg an cost ) o <br /> prohibitive and provides little benefit to the project.,A summary of published water <br /> quality data from unconsolidated alluvial deposits in the vicinity of the study area is� <br /> attached for reference. <br /> 2 - Section 4.5, of our work plan addresses remediation. In short, if significant <br /> degradation of water quality occursathe coal ash will be immediately removed and placed <br /> in a dry impoundment within the Varra property boundary. Water quality monitormg <br /> will con:inuci and impacts to groundwater resources wilt be evaluated,and additional <br /> remediation commensurate with the extent and degree of impact. The Division of <br /> Minerals and Geology will be notified of all analytical results within 24 hours of their <br /> receipt by CGRS, Inc. <br /> dmgresrronce.dnc � <br /> P.O. Box 1489 Fort Collins, CO 80522 Phone: (970)493-7780 Fax: (970)493-7986 <br />