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• Data from this well shows how the conductivity of the ground water <br />can naturally vary greatly with time. <br />Figure B-23 presents field conductivity data for KLM well <br />GP2. The early data from well GP2 contains more scatter than the <br />last five values which is probably due to the variation in samples <br />bailed from the well versus those which were pumped during the <br />September monitoring each year. The pumped samples present a <br />fairly steady plot until a decline that has existed the last three <br />years. GP2 is located at an undisturbed site on the east side of <br />the PA. Conductivity data for well GP3 which is a flowing well is <br />presented on Figure B-24, but shows some scatter. The <br />conductivities from well GP3 have been fairly steady at <br />• approximately 1300 µmhos/cm. <br />The data for well GP4 present a fairly steady plot with data <br />staying close to a value of 1300 µmhos/cm (see Figure B-25). Wells <br />GP5 and GP6 are the westernmost cells 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 µmhos/cm for well GP5 and <br />1100 µmhos/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 returned to previous values in 1992 after the <br />1991 concentrations were observed to be lower. The August, 1993, <br />value declined to 1200 µmhos/cm. Although these wells are <br />r~ <br />LJ <br />3-5 <br />