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December 23, 1999 ~ ~ Puge lb' <br />Instrument <br />Minimum <br />I Constituent Units Detection Standards <br />Limit (IMDL) <br />Dissolved Sodium mg/L 0.02 <br />I 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 />I Dissolved Thallium mg/L 0.00005 0.002 HH <br />Dissolved Uranium mg1L 0.00005 <br />I Dissolved Vanadium mg/L 0.005 0.1 AG <br />Dissolved Zinc mg/L 0.002 2.0 AG, 5.0 DW <br />Gross Alpha Particle Activity pCi/I 2 15 HH <br />I Gross Beta Particle Activity pCi/I 4 4 mrem/year HH <br />IMDL = Instrument Minimum Detection Limit <br />DW = Saje Drinking Water Standard <br />AG =Agricultural Standard <br />I HH =Human Health Srandard <br />Standards from Colorado Department ojPublie Health and Environment, Water Quality Control Commission, <br />Regulation No. 41, "The Basic Standards jor Groundwater. " <br />I 3.2 Parachute Creek Monitoring <br />Parachute Creek monitoring will include discharge and water quality. Parachute Creek <br />I will be monitored at upstream and downstream gauging locations. The upstream location, <br />I historically designated PC12, is just below the confluence of Wheeler Gulch. The downstream <br />location is historically referred to as PCl 1. <br />I The baseline discharge and water quality of Parachute Creek, in the vicinity of the site, will <br />be established prior to the start of commercial solution mining operations by the collection and <br />' analysis of 5 quarters of data collection. The surface water stations will be monitored on a once- <br />per-quarter basis during the baseline monitoring period and during commercial operations, <br />I according to USGS protocol, During these monitoring events, the discharge will be measured and <br />Parachute Creek samples will be analyzed for parameters listed in Table 5. The metals and <br />I nutrients listed in Table 5 will be analyzed for the dissolved portion for compatibility with the <br />historical database for Parachute Creek. Monitoring will be performed by American Soda, and <br />I water samples will be sent to a State of Colorado-certified lab. <br />3.3 Spring and Seep Monitoring-Piceance Site <br />I Springs and seeps at the Piceance Site will be monitored for discharge and water quality. <br />The spring and seep survey will encompass the lease boundary and the area between the southern <br />I Agapito Associates, Inc. <br />