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r <br />GP5 and GP6 are the westernmost wells of the GP well series, being <br />Brea±er than one mile from active mining in the 9R coal seams. <br />Field conductivity plots for each well present fairly stable plots <br />of the data with aver..=_ae va_lues of 1600 umhos/rm fnr will GP5 and <br />1100 umhos/r_m for well GP6, showing that the downeradient well. <br />GP5, is sub,iect to higher concentrations of dissolved solids from <br />material in the 9R aquifer between the two sites. Conductivity <br />values for both wells have returned to previous values in 1992 ~ <br />after the 1991 concentrations were observed to be lower. Altho:~eh <br />these wells are relatively close to active mining in the HI seams, <br />chances seen in these wells are natural fluctuations. <br />Conductivity plots for wells GP7 and GP8 present significant <br />• scatter through 1980 (sea Figures B-28 and B-291. Some of this <br />variation in the earl.v data is probably due to the differences in <br />bailed water samples and pumped samples from the September <br />monitoring each yzar. Gradual declining trends have or_curred in <br />these two wells the last few years. <br />Figure B-30 presents the conductivity versus time data for <br />well GP9. A fair amount of scatter is seen for this well. but a <br />recent overall declining trend seams to be ocr_izrring. <br />Wells P1 cad P3 are 311L1V131 and Lewis Shale completion <br />wells, respectively. The Lewis Shale is tho:aght to contribute some <br />water to the alluvium in this area and, therefore, may influence <br />r_end~.ictivi ty vali.tes in water from well P1 . Figure B-31 shows <br />• significant variations in..onductivity values for well P1. as would <br />be expected for an alluvial system. Precipitation has also <br />3-5 <br />