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RAG, Empire Corporation 2000 AHR <br />• increasing above 2000 unil~os/cm in 1996 and 1997, and returning below 2000 untjios/cm in <br />recent years. There is also a correlative increase in calcium, magnesium, sulfate and chlorides. <br />The source of this change is not known. However, it is unlikely due to mine discharge because <br />of the discharge's doom gradient location and the dissimilar chemical composition of mine <br />discharge water. The mine discharge water is strongly sodium-bicarbonate water with a <br />conductivity of approximately 1500 umhos/cm, while AVF-3 water is typically a mixed <br />sodium-magnesium-calcium-bicarbonate-sulfate-chloride water with conductivity averaging <br />approximately 2000 unilios/cm. The noted increase in conductivity in well AVF-3 does not <br />appear to be related to the wastewater lagoon as the conductivities in the well water have <br />historically exceeded the levels measured in the wastewater (approximately 1500 umhos/cm) <br />and the water discharged to the lagoon is primarily Trout Creek Sandstone water, typically <br />straggly sodium-bicarbonate water. <br />• <br />• <br />I.~Environmen~altEMPIREWHRt2000~Tex~~Empire2000AHR doc Page 5 <br />