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~... • ._. <br />the 003 pond indicate reduced sTFeamflow, increased dissolved solids concentrations, and <br />reduced suspended solids concentrations in comparison to the baseline data. These <br />differences are attributable to the reconstruction 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 appears to be satisfactorily under control. <br />~ In consideration of the data analyses, Seneca proposes only minor changes in the 1983 <br />i <br />hydrology monitoring program. For ground water monitoring, Seneca proposes fo: I) <br />stop monitoring wells GW-SIB-P I, GW-S18-P2, and GW-S18-P3 since these nested (mvl- <br />tiple-completion) wells have apparently failed; 2) collect field parameters at pollution <br />plume wells GW-S31A2 and GW-S33 monthly rather than weekly since it is d,:vbtful that <br />a pollution plume will ever be detected (see Section VI); and 3) to measure water levels <br />only once in the winter quarter probably in late February or early March since the data <br />i from all wells indicate that this is a stable ground wafer 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 />`~~ andbi-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-52-6 only once between 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 hazardous. These four sites will be monitored <br />monthly for flow and quality between March and early November. Site SW-52-2 will <br />continue to be monitored monthly and NPDES 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 locution 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 />-68- <br />