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1986. Well GF6 is completed in the 0 aquifer. Figure B-57 <br />presents the conductivity versus time plot for well GF6. The <br />March 1985 value is probably a field measurement error. <br />Wells GF7 and GF11 are completed in the backfill material <br />where the HI and DR coal was mined. Figures B-58 and 8-59 <br />present field conductivity data versus time for each well. <br />Recovery of water levels in the backfill material near well GF7 <br />has caused the rise in conductivity since the well was installed <br />in 1987. The conductivity plot for this well shows a peak similar <br />to that observed in the TDS plot. Well GF11 was completed in <br />July 1988 and only a very few conductivities are available for <br />it. <br />The OR aquifer is monitored in the east part of the Trapper <br />Mine permit area by well GP1. Figure B-60 presents the plot of <br />field conductivity versus time for well GP1. A fair amount of <br />scatter is seen in the data with the 1988 conductivity value <br />indicating a larger decline than the TDS value indicates. <br />Figure 8-61 presents field conductivity data for KLM well <br />GP2. The early data from well GP2 contains a good amount of <br />scatter which is probably due to the variation in samples bailed <br />from the well versus those which were pumped during the September <br />monitoring each year. The pumped samples present a fairly steady <br />plot that compares favorably with the TDS plot far well GP2 (see <br />Figure B-22). Conductivity data for HI aquifer well GP3 is <br />presented on Figure B-62. Well GP3 is also a flowing well. <br />Figure B-62 shows some scatter in the data. The two lower <br />conductivities in 1988 are thought to be non-representative based <br />. on a comparison with the TDS plot. <br />3-13 <br />