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' State Req. <br />conerning Stipulation No. 8 to the Seneca Mine Permit C-005-80, it was <br />decided that Seneca would monitor the movement of total dissolved solids <br />(TDS) from the spoils to the Grassy Creek alluvium. Monitoring would take <br />place in the following manner: ground water wells GW-S31 and GW-S33 <br />were be monitored on a weekly basis for water level, pH, temperature, and <br />~a `%Q specific conductivity. A complete water quality check will be taken on a <br />~`ti bi-annual basis. As a result of the collapse of GW-S31 in the winter of 1982, <br />`J~~ Well GW-31A2 was drilled in The fall of 1982 to replace this well. In the <br />1982 "Seneca II Mine Annual Hydrology Report," Seneca requested changing <br />the frequency of collection of field parameters for the two alluvial wells <br />from a weekly to a monthly basis. The request was granted by the CMLR <br />staff and as a result monthly monitoring began in January 1983 and <br />continues. <br />Peabody will replace monitoring wells destroyed during the course of mining <br />with wells completed in spoil materials and will monitor these wells for <br />water levels and water quality. All monitoring wells will be properly main- <br />tained by qualified personnel. <br />Following reclamation bond release, all monitoring wells will be abandoned <br />by filling the well casing with a high quality sodium bentonite hole plugging <br />agent to within seven feet of the ground surface. The hole plug will be <br />topped by five feet of cement and the casing will be broken off at two feet <br />below the ground surface. The last two feet of hole will be filled with <br />topsoi I. <br />Ground water data collected at the Seneca II Mine are on file at The Seneca <br />II Mine office and are reported to the CMLR in annual reports. Annual <br />reports submitted to date are on file at the mine office. <br />4.05.13(2) Surface Water <br />Surface water data are collected at monitoring sites SW-S2-I, SW-52-2, <br />SW-52-5, SW-S2-6, NPDES 002, NPDES 003, and NPDES 004, the locations of <br />which are illustrated on Exhibit 7-2. Another site, SW-52-4 was monitored <br />until April of 1984 when the CMLR staff approved elimination of this site <br />7-10-22 Revised February 22, 1985 <br />