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The field conductivity of Well AVF-5 was above normal in late 1983 and early 1984. <br />The laboratory measurements did not show the same high levels during that period. <br />Only Well AVF-3 has shown an upward trend in dissolved solids to above 2000 mg/L. <br />The concentration decreased to below 2000 mg/L in 1993 and 1994 but returned to <br />above 2000 mg/L in 1995; however it is still within the range established during the <br />period of 1988 to 1994 and does not yet represent a significant change. There is also <br />a correlative increase in calcium, magnesium, and chlorides. The source of this <br />change is not known. However, it is unlikely due to mine discharge because its down- <br />gradient location and the dissimilar chemical composition of mine discharge. <br />However, it is unlikely due to mine discharge because of its dissimilar chemical <br />composition to alluvial water sampled at AVF-3, and the discharge is located down- <br />O gradient form this well. The mine discharge water is strongly Sodium -Bicarbonate <br />water with a conductivity of approximately 1500 mg/L, while AVF-3 water is a mixed <br />Sodium, Magnesium, Calcium -Bicarbonate, Sulfate, Chloride, water with a <br />conductivity of approximately 2000 mg/L. The increase in conductivity in Well AVF-3 <br />is unlikely to be due to the waste water lagoon because the conductivities in the well <br />water have historically exceeded the levels measured in the waste water <br />(approximately 1500 mg/L) and the water discharged to the lagoon is primarily Trout <br />Creek sandstone water which is a strongly Sodium -Bicarbonate water. <br />C 81-044 1995 AHR (Revised 1197) Page 8 <br />