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To answer mid-term adequacy issues related to the Rollins Sandstone, 2 surface and 2 <br />underground wells were installed in the Rollins during the summer of 1997. Slug tests were <br />performed on the two surface wells and the Roadside South Portal well underground. The four <br />wells were used for water level and quality information, the results of which are included in <br />Appendix 7-3. The primary purpose of the project was to determine whether the Rollins <br />Sandstone is an aquifer. The location of the 4 wells is shown on Exhibit 56 as Rollins -1 <br />through -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 from the <br />surface near the south end of the Unit Train Loadout loop between the haul road and the <br />overland conveyor. Rollins -3 was drilled adjacent to Pond 7 at the North Decline area. Rollins - <br />4 was drilled from within the Roadside South Portals at a central location within the active <br />portion of the mine along a long term set of main entries. Lithologic and well completion logs for <br />the 4 wells are given in Appendix 7-3, Vol. 2. Continued monitoring consisted of quarterly water <br />level measurements and annual quality analysis for the parameters listed in Table 18-3. The <br />two underground wells were installed in locations with the best chance of long term access. <br />Monitoring of the two underground wells was discontinued in 2000 when the wells and mine <br />portals were sealed. Monitoring of Rollins -2 and Rollins -3 wells was discontinued with the <br />approval of SL -7 in April 2011. These wells were abandoned and reclaimed in May 2011. <br />Mine Inflows Monitoring Plan <br />Annual mine inflows studies were done in the Roadside South Portals since 1983 and were <br />started in the Roadside North Portals in 1987. The study involved locating, describing and <br />measuring mine inflows. For flows over 1 gpm, field measurement (pH, temperature and <br />conductivity) were taken. Monitoring continued on an annual basis in both mines until the <br />portals were sealed in 2000. The results of the mine inflow studies were included in the Annual <br />Hydrologic Report. <br />TR -67 18-6 Rev 11/15 <br />