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<br /> <br />Tony Waldron - 2 - May 8, 1989 <br />The operator also requested, as part of TR 44, to remove quarterly analysis of <br />Total Dissolved Solids from their ground water monitoring requirements. I <br />believe that this is justified for wells completed in the HI, KLM, QR, and <br />Twentymile Sandstone aquifers, as TDS levels have been relatively consistent <br />for at least four years. Quarterly monitoring for the following wells would <br />then consist only of water level, pH, conductivity, and temperature: <br />GA-1 GE-2 GP-2 <br />GA-2 GF-1 GP-3 <br />GB-5 GF-2 GP-4 <br />GC-1 GF-3 GP-5 <br />GD-1 GF-4 GP-6 <br />GD-2 GF-6 GP-7 <br />GE-1 GP-1 GP-8 <br />The average relationship between TDS and Field Conductivity at Trapper is <br />approximately TDS = .71 * COND. (calculated from wells GA-1, GA-2, GB-1, GB-2, <br />GB-5, GC-1, GF-1, GF-2, P1, P3, P5, P8, and J1 ), as opposed to the average <br />TDS = .59* EC published by Hem (1985). The relationship at Trapper does <br />exhibit a large amount of variability, however. <br />The White Sandstones, and the backfill and alluvial aquifers have shown more <br />variable levels of dissolved solids, as well as significant increases in some <br />cases for 1988. Quarterly analyses of TDS should continue for wells <br />monitoring these aquifers. <br />BBC/yjb <br />5972E <br />