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approximately 1500 mg/I, while AVF-3 water is typically a mixed sodium-magnesium- <br />calcium-bicarbonate-sulfate-chloride water with conductivity averaging approximately <br />2000 mgll. The noted increase in conductivity in well AVF-3 does not appear to be <br />related to the wastewater lagoon as the conductivities in the well water have <br />historically exceeded the levels measured in the wastewater (approximately 1500 <br />mg/I) and the water discharged to the lagoon is primarily Trout Creek Sandstone <br />water, typically strongly 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). In 1996 there was no discharge from the sediment ponds. <br />FLOWS <br />The Williams Fork River flow data is collected by the U.S. Geologic Survey at one <br />continuous gaging station and one staff gage. The Williams Fork River continuous <br />• C-81-Oa4 199fi AHR. I \EMPIREWHR\96AHR\EMPAHR96 DOC Page 1 O <br />