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MID-CONTINENT RESOURCES.INC <br /> 201 Centennial St_Suite 406 <br /> Glenwood Springs. Colorado 81601 <br /> (303)945.4958 <br /> February 14, 1986 <br /> Candace Thompson <br /> Mined Land Reclamation Division <br /> 423 Centennial Building <br /> 1313 Sherman Street <br /> Denver, CO 80203 <br /> SUBJECT: Hydrology review - Mid-term Permit No . C-017-81 <br /> Dear Candace: <br /> Enclosed is our final computer print-out of the Coal Basin <br /> Hydrology data . I will include the raw data in an Appendix in <br /> the permit . There are two summary sheets up front , one for <br /> surface and one for ground water. The remainder are all of the <br /> various records collected at each station. <br /> • Keep in mind that Bear Creek and Sutey Creek are controls for the <br /> surface water and possibly even. Disney Creek at this time. The <br /> old refuse pile P-1, and probably key wells #6, #9 and #11 could be <br /> considered controls as they reflect. the last 30 years of operations . <br /> As you look at the data you will notice that it is very steady. <br /> There are basically no trends up or down in any of the perimeters . <br /> If you look at P-2 and P-3- in the middle of the old refuse pile <br /> and P-7 and P-8 directly adjacent to the lower perimeter of the <br /> pile you will notice elevated conductivity, alkalinity/bicarbonate <br /> T.D. S . and sulfate. P-2 and P-8 are some what high in sulfate <br /> but this is probably directly attributable to pyrite oxidation <br /> of the coal refuse. I don' t think any of these are surprises <br /> considering the composition of the refuse . It is also apparent <br /> that none of these concentrations show up in Coal Creek at station <br /> #20. It might also be a good. idea for you to check in the old <br /> permit Vol . 5, Appendix III-E-5 and compare station. #1 Coal Creek <br /> at the mouth. <br /> The surface water is pretty straight forward showing clearly that <br /> Dutch .Creek (which contains 100% of the working mines) is surely <br /> the culprit for showing that we are operating a coal mine. The <br /> elevated alkalinity and sodium I think can be directly attributed <br /> to the main coal storage piles, tunnel refuse, #1 and #2 mine <br /> • operations and mine discharges and four miles` of truck haul roads, <br /> all on or adjacent to Dutch Creek. <br /> jj 38.1 <br />