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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 wells were installed in the <br />Rollins during the summer of 1997. Slug tests were performed on the two <br />surface wells and the Roadside South Portal well underground. The four wells <br />were used for water level and quality information. The results are included in <br />Appendix 7.3. The primary purpose of the project was to determine whether the <br />Rollins Sandstone is an.aquifer. The location of the four wells is shown on Exhibit <br />56 as Rollins 1 through 4. Rollins 1 was drilled from within the Roadside North <br />Portal at a central location within the existing mine along a long tern set of main <br />entries. Rollins 2 was drilled from the surface near the south end of the Unit <br />Train Loadout. Rollins 3 was drilled adjacent to pond 7 at the North Decline area. <br />Roiiins 4 was iiriiieu iruiii witfiiu ilie Rcadsiue Soutn rortais at a central location <br />within the active portion of the mine along a long term set of main entries. <br />Lithilogic and well completion logs for the four wells are given in Appendix 7.3 of <br />Volume 2. Continued monitoring will consist of quarterly water level <br />measurements and annual quality measurements and annual water quality <br />analysis for the parameters listed in Table 18.3. The two underground wells were <br />installed in locations with the best chance of long term access. Monitoring of <br />these underground wells will be discontinued if access is precluded by conditions <br />or closure of the area. <br />Mine Inflows Monitoring Plan <br />Annual mine inflows studies have been done in the Roadside South Portals <br />since 1983 and were started in the Roadside North Portals in 1987. The study <br />involves locating, describing and measuring mine inflows. For flows over 1 gpm, <br />field measurement (pH, temperature and conductivity) are taken. Monitoring will <br />be continued on an annual basis in both mines. The results of the mine inflow <br />studies will be included in the Annual Hydrologic Report. <br /> <br />VOL5Tab18 18-6 7-7-99 <br />