_GENERAL DOCUMENTS - C1981017 (260)

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MID-CONTINENT RESOURCES. INC. '101 Centennial St.,Suite 406 Glenwood Springs, Colorado 81601 (303)945-4958 February 14 , 1986 FEB Candace Thompson Mined Land Reclamation Division 423 Centennial Building 1313 Sherman Street Denver , CO 80203 SUBJECT : Hydrology review - Mid-term Permit No . C-017-81 Dear Candace: Enclosed is our final computer print-out of the Coal Basin Hydrology data . I will include the raw data in an Appendix in the permit . There are two summary sheets up front , one for surface and one for ground water . The remainder are all of the various records collected at each station. Keep in mind that Bear Creek and Sutey Creek are controls for the surface water and possibly even Disney Creek at this time . The old refuse pile P-1, and probably key wells #6 , #9 and #11 could be considered controls as they reflect the last 30 years of operations . As you look at the data you will notice that it is very steady . There are basically no trends up or down in any of the perimeters . If you look at P-2 and P-3 in the middle of the old refuse pile and P-7 and P-8 directly adjacent to the lower perimeter of the pile you will notice elevated conductivity, alkalinity/bicarbonate T .D . S . and sulfate . P-2 and P-8 are somewhat high in sulfate but this is probably directly attributable to pyrite oxidation of the coal refuse . I don' t think any of these are surprises considering the composition of the refuse . It is also apparent that none of these concentrations show up in Coal Creek at station #20 . It might also be a good idea for you to check in the old permit Vol . 5 , Appendix III-E-5 and compare station #1 Coal Creek at the mouth . The surface water is pretty straight forward showing clearly that Dutch Creek (which contains 100% of the working mines) is surely the culprit for showing that we are operating a coal mine . The elevated alkalinity and sodium I think can be directly attributed to the main coal storage piles , tunnel refuse, #1 and #2 mine operations and mine discharges and four miles of truck haul roads , all on or adjacent to Dutch Creek.