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STATE OF COLORADO DIVISION OF MINERALS AND GEOLOGY Department of Natural Resources 1313 Sherman 5[., Room 215 Denver, Colorado 80203 Phone: (303) 866-3567 FAX: (303) 832-8106 December 19, 2002 Dennis Jones Seneca Coal Company P.O. Box 670 Hayden, CO 81639 Re: Seneca II-W Mine (Permit No. C-82-057) 2001 Annual Hydrology Report Review Deaz Mr. Jones: DIVISION OF MINERALS GEOLOGY RECLAMATION MININ G•SAFETY Bill Owens Governor Greg E. Walther Ezeculive Director Ronald W. Cattany Acting Division Director The Division has reviewed Seneca Coal Company's (BCC's) 2001 Annual Hydrology Report (AHR) for the Seneca II-W Mine. The frequency of data collection is in compliance with the approved monitoring plan contained in the permit document. The 2001 AHR is well written and the required data aze presented in a concise manner. Samples for water quality analysis could not be obtained at one surface water sample location and several spring locations. Surface water site SW-S2W-SG9 was not sampled in September as required because of low flow conditions. Water quality samples were not obtained from spring location S-5 because the spring was dry in September/November. Springs S-41 and 5-49 were not sampled because these springs were buried in spoils and/or abandoned due to mining. One field paramater analysis was obtained at 5-49 in June, 2001. Samples for water quality analysis were not obtained at several groundwater monitoring locations due to the wells going dry or not enough water to sample. Wells GW-S2W-4W, GW-S2W- 40V2, and GW-S2W-20A were dry. Only one sample was collected in May 2001 at GW-S2W- 4WC and a problem was noted with the well in October 2001. Well GW-S2W-16W had water in the well casing but enough to obtain samples for laboratory analysis. Samples were not collected in October for wells GW-S2W-160V and GW-S2W-22A due to a lack of water.