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999 <br />STATE OF COLORAL)O <br />Roy Romer, Governor <br />~r'_i% <br />DEPARTMENT OF NATURAL RESOURCES <br />MINED LAND RECLAMATION DfVISION (. ~, <br />FRED R. BANTA, Director <br />January 17, 1989 <br />h1r. Jim Stover, P.E. <br />Chief Engineer <br />Snowmass Coal Company <br />P.O. Box 1354 <br />Palisade, Colorado 81526 <br />RE: 1988 Annual Hydrologic Report, IJorth Thompson Creek Kline, C-81-025 <br />Dear h1r. Stover: <br />I have reviewed the 1988 annual hydrologic report for tV1e IJortV1 Thompson Creek <br />Mine. The following are my observations on the data contained therein. <br />No significant variation was noted between the upstream and downstream North <br />Thompson Creek monitoring stations for same day sampling. <br />The water level is stable to decreasing in the wells down dip of the refuse <br />pile. The level of conductivity is increasing in D-lA to a September 1988 <br />maximum of 4300 umhos/cm. The conductivity in D-2A is stable to decreasing <br />with a maximum level of 2340 umhos/cm in 1988. Both wells show a trend to <br />higher conductivities in lower flow months, but the trend is not consistent <br />enough to be labeled a seasonal variation. The cause of variation in TDS <br />between the two wells is also not known at this time. If the operator has any <br />ideas as to this cause it should be noted in the 1989 annual hydrologic <br />report. Due to the lack of volume in the pile, compaction of the pile, and <br />lowering water levels indicated in the wells, no spring development is <br />expected to occur that could adversely impact the surface water or ground <br />water associated with the refuse pile. <br />The TDS level of mine water at No. 3 Mine remains steady at a 1000 mg/1 <br />level. This water is being directly discharged to the hlorth Thompson Creek <br />under an NDPES permit. <br />215 Centennial Building, 1313 Sherman Street Denver, Colorado 80203-2273 Tel. (303) 866-3567 <br />