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significant variations in conductivity values for well P1, as would <br />I <br />be expected for and alluvial system. Precipitation has also <br />influenced recharge to the Lewis Shale. Conductivity values for <br />' 1991 for both of these wells show a gradual declining trend. <br />Wells P5 and P8 have shown variations in values as expected <br />from shallow aquifers. Figures B-33 and B-34 each show general <br />rising trends since~1984 through 1989. The conductivity in well <br />P5 seems to be stabilizing in 1990 and 1991, while an overall <br />decline was observed 'in well P8 for the last twa years. <br />The conductivity of water in well J1 wa:~ steady to 1985, <br />followed by a rising and declining trend. After a steady period in <br />1990, conductivity values appear to be on a rising trend in 1991. <br />The COY well conductivity data presented in Figure B-36 shows that <br />the higher precipitation amounts in 1963 and 1934 probably caused <br />the conductivity to decline in the alluvial aquifer in 1984 and <br />1985. Conductivity values hit a high of 2650 umhos/cm in 1990 and <br />then dropped in 1991 to 2180 umhos/cm. <br />Water collected from the Third White Sandstone well 81-03a <br />yielded the conductivities plotted on Figure B-3'T. Conductivities <br />in well 81-03a had been steadily increasing since 1987 but were <br />fairly stable since 1989. Values of conductivity collected to date <br />for well GLUX-1 are presented on Figure B-38 and have been fairly <br />stable. Conductivity data for well GMP-1 have teen collected for <br />the past year and are presented in Figure B-39. 'Phe first value in <br />late 1990 was high, but the values observed for :1991 are lower and <br />have remained fairly stable throughout the year. <br />3-6 <br />