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iii iiiiiiiiniiiiii DEPARTMENT OF NATURAL~R ESOURCES Davitl H. Gelch ee. Ezecu hve D,rector MINED LAND RECLAMATION DIVISION DAVID C. SH ELTON, Dlractor Richard D. Lamm •°`'~, Governor .~ 4~ September 13, 1984 ~ •~~"~ ~~ L- L~. ~, ~ ~/ ^~ (~ .% - i ~ ~' ,~ ~~ Mr. Scott Jones ` ~, Snowmass Coal Company ~`' P.O. BOx 980 •`\ Carbondale, Colorado 81623 ~ Re: North Thompson Creek Mine Permit C-025-81 Inflow Pitigation Plan. Dear Mr. Jones: This letter is in reference to your plans to mitigate any depletions to North Thompson Creek. On may 15, 1984 in response to your permit commitment,Bill Tate submitted a report to Mined Land Reclamation Division on the status of your mitigation plans. His response proposed to delay filing a plan far water replacement until 1985 in order to allow for additional hydrologic data to be collected. In the meantime Snowmass has committed to pumping 11,000 gpd {12gpm) if a call on the water is made. The State Engineer's office reviewed your proposal in June of 1984. The Division agrees with your proposal and time frames. Water availability in the Roaring Fork Valley is better than normal with the past year's snow and rainfall. The Division also agrees that a fall mine inflow study of areas l0A through 20 (or all areas) would be beneficial. However, there was one concern noted with your plan. Your interum proposal to replace 17,000 gpd or 12gpm during a call appears to be low. The Division has reviewed your November 1983 and June 28, 1984 mine inflow studies. In Mine No. 1 inflows from areas 5a-f appear to be ground water related and/or connected with the shear zone. Areas 1,2, and 3 may he associated with the creek (except for any inflows from the No. 2 mine). Areas 10-20 are inconclusive. They are close enough to the Middle Thompson Creek as as to be in communication. It i5 likely that they may be indirectly tied to the stream or its alluvium via fractures or a groundwater source that is recharged by the stream. A fall study of this area might aid in amore conclusive finding. In Mine No. 3 areas 1,2, and 3 may be related to the creek but flows are not large. As in issuing permits, the Division`s policy is to assume worst case when results are inconclusive. Our recommendation is that if a call for water exists on Thompson Creek Snowmass would be responsible for 45 gpm or 64,800 gallons per day. This figure assumes areas 10A-20 (roof discharges) are causing a depletion, either directly or indirectly to Thompson Creek. 423 Centennial Building, 1313 Sherman Street Denver, Colorado 80203 Tel. (30~! 866-3567