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Apri122, 1999 ~ • pnge 16 Constituent Units I'QL MDL Dissolved Sulfate (mg/I) 200 100 Dissolved Sulfide as H,S (mg/I) 0.1 0.02 Dissolved Thallium (mg/I) 0.01 0.002 Dissolved Uranium (mg/I) 0.01 0.0001 Dissolved Vanadium (mg/I) 0.03 0,006 Dissolved Zinc (mg/I) 1 0.3 Gross Alpha Particle Activity pCi/I 0.7 1.5 Gross Beta Particle Activity pCi/I 0.7 1.5 A tracer dilution study will be conducted along the section of Piceance Creek that borders the Yankee Gulch site. The USGS will conduct the study. The tracer dilution study is an investigation of groundwater inputs and the associated water quality along Piceance Creek. This information would provide baseline data on diffuse inputs to Piceance Creek. The data would be collected at base stream flow. In part, the purpose of the study is to evaluate the location of the existing and proposed alluvial monitoring wells, and assess the value of additional alluvial monitoring well locations. Crest stage monitoring stations will be installed by the USGS at Piceance Creek adjacent to the upstream and downstream monitoring wells. The crest stage gages will be tied into the datum of the alluvial wells, and will provide information on water levels in the observation wells and peak stream flow in Piceance Creek. 4.2 Parachute Creek Monitoring Parachute Creek monitoring will include dischazge and water quality. Parachute Creek will be monitored at proposed upstream and downstream gauging stations. The baseline discharge and water quality of Parachute Creek, in the vicinity of the site, will be established for five quarters (13 months) prior to the start of commercial solution mining operations. The surface water stations will be monitored on a once per quarter basis during the baseline monitoring period and during commercial operations. During these monitoring events, the dischazge will be measured and Parachute Creek water will be sampled for the parameters listed in Table 5. The metals and nutrients listed in Table 5 will be analyzed for the dissolved portion for compatibility with the historical database for Parachute Creek. The water quality samples will be analyzed in accordance with the procedures detailed in Appendix C. Samples will be collected by Agapito Associates, Inc.