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To answer mid -term adequacy issues related to the Rollins Sandstone, the <br />installation of 2 surface wells and 2 underground were installed in the Rollins during <br />the summer of 1997. Slug tests were performed on the two surface wells and the <br />Roadside South Portal well underground. The four wells were used for water level <br />and quality information, the results of which are included in Appendix 7 -3. The <br />primary purpose of the project was to determine whether the Rollins Sandstone is <br />an aquifer. The location of the 4 wells is shown on Exhibit 56 as Rollins -1 through <br />-4. Rollins -1 was drilled from within the Roadside North Portal at a central location <br />within the existing mine along a long term set of main entries. Rollins -2 was drilled <br />from the surface near the south end of the Unit Train Loadout loop between the <br />haul road and the overland conveyor. Rollins -3 was drilled adjacent to Pond 7 at <br />the North Decline area. Rollins -4 was drilled from within the Roadside South <br />Portals at a central location within the active portion of the mine along a long term <br />set of main entries. Lithologic and well completion logs for the 4 wells are given in <br />Appendix 7 -3, Vol. 2. Continued monitoring consisted of quarterly water level <br />measurements and annual quality analysis for the parameters listed in Table 18 -3. <br />The two underground wells were installed in locations with the best chance of long <br />term access. Monitoring of the two underground wells was discontinued in 2000 <br />when the wells and mine portals were sealed. Monitoring of Rollins -2 and Rollins -3 <br />wells was discontinued with the approval of SL -7 in April 2011. These wells were <br />abandoned and reclaimed in May 2011. <br />Mine Inflows Monitoring Plan <br />Annual mine inflows studies were done in the Roadside South Portals since <br />1983 and were started in the Roadside North Portals in 1987. The study involved <br />locating, describing and measuring mine inflows. For flows over 1 gpm, field <br />measurement (pH, temperature and conductivity) were taken. Monitoring continued <br />on an annual basis in both mines. The results of the mine inflow studies were <br />included in the Annual Hydrologic Report. <br />TR -62 18 -6 Rev 07/11 <br />