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L~ <br />1 <br /> <br /> <br /> <br />1 <br />1 <br /> <br />1 <br /> <br />1 <br /> <br /> <br /> <br />1 <br /> <br /> <br />1 <br />ARCADIS GERAGHTY& MILLER <br />Table 7. Water puality Standards, Rio Grande <br />Cadmium (acute) 5 2 ug/L <br />Cadmium (chronic) 0.7 ug/L <br />Cadmium (trout) 2.1 ug/L <br />Chromium III (acute) 1096 ug/L <br />Chromium III (chronic) 131 ug/L <br />Copper (acute) 10 ug/L <br />Copper (chronic) 7 ug/L <br />Lead (acute) 39 ug/L <br />Lead (chronic) 2 ug/L <br />Nickel (acute) 603 ug/L <br />Nickel (chronic) 62 ug/L <br />Silver (acute) 0.77 ug/L <br />Silver (chronic) 0.12 ug/L <br />Silver (trout) 0.03 ug/L <br />Uranium (acute) 1292 ug/L <br />Uranium (chronic) B07 ug/L <br />Zlnc (acute) 73 ug/L <br />Zinc (chronic) 66 ug/L <br />chromium+6 (acute) 16 ug/L <br />chromium+6 (chronic) 11 ug/L <br />Selenium (acute) 135 ug/L <br />Selenium (chronic) 17 ug/L <br />28, Mainstem of the Rito Seco <br />Notes: <br />Table Value Standards (TVS) are based on a calculation that requires input of hardness data for the water <br />at the point of compliance. Data from downgradient monitoring station RS-2 were used as input to the TVS <br />calculations. Hardness data collected from 1987 up to (but not including) 1990, when the mine opened, are <br />used in the calculations to reflect pre-mine downgradient conditions. <br />The average hardness value calculated is 63.2 mg/L with a standard deviation of 9.5. This results in a 95 <br />percent confidence interval range of 57 to 69.4 mg/L. In accordance with the regulation, the lower 95 <br />percent confidence interval value is used in the TVS calculation (57 mg/L). <br />Page 1 <br /> <br />