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. GRAND VALLEY COAL COMPANY r.o. soX 70 Loma, Colorado 81524-0070 (970) 858-3608 FAX (970) 858-7690 November 23, 1998 Mr. Dan Mathews Division of Minerals & Geology 2148 Broadway; #C-5 Grand Junction, CO 81503 Re: 1998 Annual Hydrologic Report Munger and McClane Canyon Mines Deaz Mr. Mathews; This report on the mine inflows, discharges and probable hydrologic consequences for the next year is submitted in compliance with the stipulations of the Mining and Reclamation permits • for the mines noted above. The stipulations require a report for each permit. Since the mines aze in close proximity, the effects can be combined; therefore, two copies of this single report detailing the cumulative effects are provided. Both McClane and Munger Canyon Mines were idle during the period. This report shall first discuss the effect of McC(ane Canyon Mine on the hydrologic regime, next discuss the effect of Munger Canyon Mine, then give an overview of the surface water system and groundwater monitoring. This report shall conclude with a discussion of the cumulative effect of both mines on the hydrology of East Salt Creek. McCLANE CHNYON MINE Mine History and Prodnction The McClane Canyon Mine began production in 1977. The mine ceased production later that year when a fault was encountered. The mine remained idle until 1980. From 1977 through 1982 the mine produced a total of 184,365 tons of coal. )n 1983 the mine was idled and remained under Division approved temporary cessation until November 1988. In December of 1988; 3,995 tons of coal were mined. In 1989; 125,200 tons of coal were produced. Production during 1990 totaled 208,945 tons. Production for 1991 totaled 194,000 tons of coal. 1992 Production was 7,914 tons. No coal has been produced between 1992 and 1996. Tn 1997 production of 49,115 tons was accomplished. The mine was idle during 1998 and was placed in Temporary Cessation. As required by stipulations, amine map for McClane Canyon showing important hydrologic features is included as Figure 3. There was no water encountered by mining in 1998; therefore, . no hydrologic features are noted. In response to comments made by the Division regarding the 1995 annual hydrologic report, Figure 1 -Water Sampling Locations, has been added. Figure ] is a line diagram of the drainages and water sampling locations that was derived from Figure 4.2-2 of the McClane Canyon Mine permit.