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SOMERSET MINING COMPANY • MINB INFLOW STUDY Introduction This mine inflow study is for the abandoned Somerset Mine. The mine is located just north of the town of Somerset. The mine portals were sealed during May and June of 1986. During 1986 the Operator submitted a water management plan to replace the annual mine water inflow study which had been prepared and submitted to the Division during prior years. The water management plan was developed, in part, to monitor the flooding of the underground mine. Depth to water measurements and water quality samples are obtained from two drill holes, H-10 and B-6, that have been converted into monitoring wells. H-10 is located at the former substation site along Hubbard Creek direct- ly across the creek Prom the reclaimed Blue Ribbon Mine. B-6 is located in Bear Canyon in Section 1, T. 13 S., R. 91 W. in Gunni- son County about two miles from the mouth of the canyon. Monitoring of the wells began in July, 1986. Monitoring is scheduled four times per year during May, June, August and Octo- ber. Water was first encountered in H-10 in July, 1986. No water was encountered in B-6 until October, 1987. See Table 1 for a tabulation of the water levels in B-6 and H-10. The graph • immediately following Table 1 presents actual and projected water levels for the wells. For the purposes of this mine inflow study the mine was separated into four separate areas. These areas are isolated by unmined blocks of coal. The following areas are designated on the enclosed map, Figure 1. 1. H-10 Area 2. 4 Dip Area 3. B-6 Area 4. Area East of B-6 The following procedures and assumptions were used to project the rate of water inflow into the H-10 and the B-6 Areas. 1. The water level contours for October 1987, October 1988, October 1989 and August 1990 were drawn on a mine map. In the case of H-10, the water level was virtually constant from May 1987 until October 1988. The water levels were drawn at the floor of the coal seam. • 2. The mined out areas between the water level contours were assumed to be completely filled as the water level rose.