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iii iiiiiniiiiii iii <br />~( ~1~ ACZ Inc. 999 <br />I I~rJ, Engineering and Environmental Services <br />1475 Pine Grove Road, Suite 109 <br />P.O. Box 774018 <br />Steamboat Springs, Colorado 80477 <br />303-879-6260 <br />April 22, 1993 <br />Mr. Kent A. Gorham, Reclamation Specialist <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RE.CE!~lEp <br />APR 2 31993 <br />Division ul MmetaiS & :ieo1099 <br />Re: The Rockcastle Company -Grassy Gap Mine (C-81-039): Response to 1993 Annual <br />Hydrology Report Comments <br />Dear Mr. Gorham: <br />In response to the Division of Minerals and Geology (DMG), Department of Natural <br />Resources letter dated April 8, 1993 following review of the 1992 Annual Hydrology <br />Report, our response is given below: <br />Comment: Surface monitorang site SW~3 shows elevated sulfate, TDS, Calcium and <br />Magnesium values above what would be expected for this upstream site. These values are <br />similar to what one would expect of a spoil spring. Pit No. 1 is the only possible spoil <br />spring contributor yet no spoil springs were utentified for Pit No 1. <br />Response: As discussed in the 1992 Annual Hydrology Report, page 4, surface <br />monitoring point SW-3 is located on the access road to Pits 2 and 3. SW-3 was <br />observed flowing in June due to discharge from Spring 5, upgradient along the access <br />road. The location of Spring 5 is discussed on page 7 of the same report and was <br />observed along the access road [o Pits 2 and 3 and in a natural drainage <br />approximately 400 feet west of the Pit 2 western perimeter. The location of Spring <br />5 as well as the surface monitoring points are presented on Map 1 which was <br />submitted with the original report. The flow likely originates in the Pit 2 spoil as <br />the laboratory analyses indicate. <br />Although the TDS levels are indicative of spoil water, the water quality is still within <br />the concentrations suitable for livestock, wildlife and agricultural uses. Surface water <br />monitoring point SW-2 is located approximately 1.2 miles down stream of SW-3 and <br />the water quality at that location appears to be normal for the area. Many stock and <br />beaver ponds located along Grassy Creek allow the water quality to improve rapidly <br />down gradient. <br />If you have additional questions concerning the 1992 Annual Hydrology Report or the <br />response to your question, please contact either myself or Jerry Nettleton at (303) 879-6260. <br />Sincerely, <br />ACZ Inc. <br />Robert J. Peterson, CPG erryNettleton <br />Project Engineer Seni Engineer <br />RJP:cmc <br />cc: Rober[ Sherman/Ryan Inc., Dean Massey/PMH&S <br />