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RAG, Empire Corporation 1999 AHR <br />•~, and the dissimilar chemical composition of mine discharge water. The mine discharge <br />water is strongly sodium-bicarbonate water with a conductivity of approximately 1500 <br />mg/I, while AVF-3 water is typically a mixed sodium-magnesium-calcium-bicarbonate- <br />sulfate-chloride water with conductivity averaging approximately 2000 mg/I. The <br />noted increase in conductivity in well AVF-3 does not appear to be related to the <br />wastewater lagoon as the conductivities in the well water have historically exceeded <br />the levels measured in the wastewater (approximately 1500 mg/I) and the water <br />discharged to the lagoon is primarily Trout Creek Sandstone water, typically strongly <br />sodium-bicarbonate water. <br />• SURFACE WATER MONITORING <br />RIVERS <br />There are two rivers in the vicinity of the mine site. The Yampa, flows in a <br />southeasterly direction across the mine site. The Yampa River drains most of the <br />northeast corner of Colorado and part of south-central Wyoming. The second river is <br />the Williams Fork, which is a major tributary of the Yampa River. The Williams Fork <br />River joins the Yampa River on the mine property. Monitoring data is collected for the <br />Williams Fork River. Monitoring data is also collected from one spring, the #1 Strip Pit <br />(NPDES site 022). <br />FLOWS <br />The U.S. Geologic Survey at one continuous gaging station and one staff gage <br />Page 9 <br />