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Moun[ain Coa! Company 1997 Annual Hydrology Report Wes! E!k Mine <br />Well SOM-128-H was established in the vicinity of the surface facilities in late 1990 to monitor <br />• water levels within the Rollins Sandstone down-dip of the longwall mine workings. During the <br />first two years of observation, the water level in this well increased more than 150 feet. This <br />water level rise may be the result of the confined hydrostatic pressure and low transmissivity of <br />the Rollins Formation at this location. This observation has not been replicated at either of the <br />other Rollins Formation monitoring wells. Equilibrium in well SOM-128-H was reached some <br />time in the eazly part of 1993. Since that time (including WY97), the water level has slowly and <br />steadily declined. This beginning of this decline generally coincides with the initiation of <br />longwall mining of the B-Seam. However, the well is down dip more than one-half mile. Also, <br />mine inflows to the B-Seam, except as occurred through the B East Mains and 14 SEHG faults in <br />1996 and 1997, have been small (generally less than 50 gpm). Most of these inflows have <br />generally been reported to have occurred in the roof or rib and not from the floor. Water level <br />observations made during WY96 and WY97 show no effect from the interception of the B East <br />Mains and 14 SEHG fault systems indicating that these systems are isolated from the Rollins <br />Sandstone in the vicinity of SOM-128-H. Further observations will be closely reviewed and <br />evaluated in an effort to further explore the relevance of these observations. Water quality <br />results obtained from WY97 were within the range of data previously obtained for baseline <br />purposes. <br />• <br />• <br />1-032.9 0 age Wrig ! a[er Engineers <br />