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The data for cell GP4 presents a fairly steady plot with data <br />staying close to a value of 1300 umhos/cm (see Figure B-25). Wells <br />GP5 and GP6 are the westernmost wells of the GP well series, being <br />greater than one mile from active mining in the QR coal seams. <br />Field conductivity plots for each well present fairly stable plots <br />of the data with average values of 1600 umhos/cm for well GP5 and <br />1100 umhos/cm for well GP6, showing that the downgradient well, <br />GP5, is subject to higher concentrations of dissolved solids from <br />material in the QR aquifer between the two sites. Conductivity <br />values for both wells have dropped in 1991 and additional data is <br />needed to determine if a downward trend is developing. Although <br />these cells are relatively close to active mining in the HI seams, <br />changes seen in these wells are natural fluctuations. <br />Conductivit <br />y plots for wells GP7 and GP8 present significant <br />scatter through 1986 (see Figures B-26 and B-29). This variation <br />in the early data is probably due to the differences in bailed <br />water samples and pumped samples from the September monitoring each <br />year. Gradual declining trends have occurred in these two wells <br />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 seems to be occurring. <br />Wells P1 and P3 are alluvial and Lewis Shale completion <br />wells, respectively. The Lewis Shale is thought to contribute some <br /> water to the alluvium in this area and, therefore, may influence <br />~~ conductivity values in water from well P1. Figure B-31 shows <br />3-5 <br />