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December 23, l 999 Pnge 13 <br />• Analytical Laborator y Parameters <br /> Instrument <br /> Minimum <br /> Constituent Units Detection Standards <br />_ Limit (IMDL) <br /> Dissolved Silica mg/L 0.2 <br /> Dissolved Silver mg/L 0.0002 0.05 HH <br /> Dissolved Sodium mg/L 0.02 <br /> Dissolved Strontium mg/L 0.01 <br /> Dissolved Sulfate mg/L 0.5 250 DW <br /> Dissolved Sulfide as HZS mg/L 0.02 <br /> Dissolved Thallium mg/L 0.00005 0.002 HH <br /> Dissolved Uranium mg/L 0.00005 <br /> Dissolved Vanadium mg/L 0.005 0.1 AG <br /> Dissolved Zinc mg/L D•002 Z.0 AG, 5.0 D W <br /> Gross Alpha Particle Activity pCi/1 2 15 HH <br /> Gross Beta Particle Activity pCi/1 4 4 mrem/year Hli <br /> IMDL = Instrument Mininnrm Detection Limit <br /> DW =Safe Drinking Water Standard <br /> AC = Agricultural Standard <br /> HH = Hrrman Health Standard <br /> Standards from Colorado Department ojPublic Health and 6n vironnren[, Water Quality Control Commission, <br /> Regulation No. 41, "The Basic Standards jot Groundwater. " <br />• <br /> Crounduwter Quality Monitoring Schedule <br /> At the Piceance Site, schedules for groundwater sampling have been developed for the <br /> baseline period and the operations period. The schedu le is summarized in Table 4. <br />Table 4. Summary of Piceance Site Groundwater Quality Monitoring Schedule <br />Baseline Period <br />Monitoring (Five Quarters Prior to During First 5 Years of <br />Locations Commercial Operations) Commercial Operations <br />Wells Monthly (WQ2) Monthly (WQ1), Quarterly (WQ2) <br />Out-of--panel Wells Mondrly(WQ2) Quarterly(WQ2) <br />Domestic Wells Quarterly (for state drinking water Quarterly (for state drinking water <br />compliance) compliance) <br />Dissolution Surface Monthly (water level, Weekly (water level, conductivity, <br />Wells conductivity, and temperature) and temperature) <br /> <br />Agapito Associates, Inc. <br />