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<br />' Somerset Mining Company <br />1994 Annual Hydrologic Report <br />will influence future monitoring requirements for the discharge <br />permit. <br />' The annual mine inflow study is presented on the Mine Inflow Map in <br />the appendix. <br />' Groundwater Information <br />' The data collected from the groundwater monitoring stations and <br />laboratory results are presented in Appendix 3. <br />' The sealing of all of the Somerset Mine portals precludes obtaining <br />underground water samples. wells B-6 and H-10 are used to monitor <br />groundwater inflow and quality in order to predict the extent of <br />t flooding in the underground workings. <br />Station H-10, a well in Hubbard Creek Canyon, was monitored in <br />April and October. The water level has been in the range from 6066 <br />' feet to 6069 feet for the past three years. Station B-6, a well in <br />Bear Creek Canyon, was monitored in April and October. The water <br />level has been in the range from 6026 feet to 6051 feet for the <br />' past three years. <br />Drill hole monitoring points SC-1 and SC-2 are designed to monitor <br />' the water level and quality of the water in the Rollins Sandstone <br />which is 40 to 50-feet below the B-Seam. SMC collected one year's <br />monitoring data during 1991 before any substantial mining was <br />performed in the B-Seam. Monitoring of SC-1 and SC-2 after mining <br />' is performed in the B-Seam should confirm that the mining operation <br />does not adversely affect the aquifer in the Rollins Sandstone. <br />The Rollins Sandstone is a confined aquifer as evidenced by recent <br />' water level measurements which are well above the top of the <br />sandstone member. It is very unlikely that the mine workings which <br />will be some 40 to 50-feet above the Rollins Sandstone will have <br />any impact on it since it is a confined aquifer. A significant <br />' drop in the water level in SC-1 or SC-2 would indicate that the <br />mine may be having an impact on the Rollins Sandstone. <br />Drill hole monitoring point SC-3 is designed to monitor the water <br />level and quality of water in the water bearing zone in the D-Seam. <br />This water bearing zone is some 200-feet above the coal seams to be <br />' mined. It is very unlikely that the mine workings will have any <br />impact on this water bearing zone. A significant drop in the water <br />level in SC-3 would indicate that the mine may be having an impact <br />on this zone. <br />Prior to Technical Revision No. 20, the monitoring schedule <br />required monthly field parameters, quarterly full suite for <br />1 2 <br /> <br />