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<br /> <br />the 003 pond indicate reduced streamflow, increased dissolved solids concentrations, and <br />reduced suspended solids concentrations in comparison to the baseline data. These <br />differences are attributable to the reconst-uction of and different management scheme <br />for the 003 pond. The three sediment control ponds at the mine work very effectively. <br />In short, the Seneca II Mine hydrology appea s to be satisfactorily under control. <br />In consideration of the data analyses, Ser.~ca proposes only minor changes in the 1983 <br />hydrology monitoring program. For gro~d water monitoring, Seneca proposes to: I) <br />stop monitoring wells GW-518-P I, GW-$18-P2, and GW-518-P3 since these nested (mul- <br />tiple-completion) wells have apparently failed; 2) collect field parameters at pollution <br />plume wells GW-531A2 and GW-533 monthl+ rather than weekly since it is doubtful that <br />a pollution plume will ever be detected (sue Section VI); and 3) to measure water levels <br />only once in the winter quarter probably it late February or early March since the data <br />from all wells indicate that this is a stably ground water level period. Also, the winter <br />snowpack at the mine makes monthly water level monitoring difficult and potentially <br />hazardous during the winter quarter. In all other respects, the 1983 ground water moni- <br />toring program will be similar to the 1982 monitoring program (i.e. monthly water levels <br />and bi-annual sampling). <br />For surface water monitoring, Seneca proposes to monitor surface water sites SW-52-I, <br />SW-S2-4, SW-S2-5, and SW-S2-6 only once t•etween November 1983 and late February or <br />early March 1984 for flow and quality since These sites are typically frozen in this period <br />while access is difficult and potentially hczardous. These four sites will be monitored <br />monthly for flow and quality between March and early November. Site SW-S2-2 will <br />continue to be monitored monthly and NPC~.S Points 002, 003, and 004 weekly for flow <br />and quality. <br />Another small detail Seneca will attend to in 1983 is surveying the exact location of <br />monitor wells GW-S31A2 and GW-545P1. <br />Seneca Coals personnel will contact the CMLR staff soon regarding the proposed changes <br />in the surface and ground water monitoring programs. <br />_ ~g <br />