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• f.. ~ <br /> TABLE 2 <br /> Yampa Valle y Coal Comoanv <br /> Selected Water Quality Data <br /> All Years <br /> 75Y of No. No. <br /> Parameter Units No. Mean Max. Standard Exceeding Standard Exceecinq <br /> Arsenic, Tot ug/L 548 2.7 400 4 25 5 15 <br /> Arsenic, TR ug/L 81 1.2 20 4 1 5 1 <br /> Arsenic, Diss ug/L 349 2.2 14 4 11 5 8 <br /> Lead, Tot ug/1 460 45 990 19 >143 25 >74 <br /> Lead, TR ug/L 90 22 50 19 >13 25 >7 <br /> Lead, Diss ug/L 122 153 900 19 >12 25 >12 <br /> Copper, Tot ug/L 756 19 290 17 >127 22 >66 <br /> Copper, TR ug/L 286 8.9 420 17 20 22 15 <br /> Copper, Diss ug/L 234 32 220 17 >47 22 >39 <br /> Molybdenum, Tot ug/L 454 114 500 8 >38 10 >20 <br /> Molybdenum, TR ug/L 57 49 50 B >1 10 >1 <br />• Molybdenum, Diss ug/L 119 153 400 8 >18 10 >13 <br /> Nickel, Tot ug/L 102 64 120 - - 70 6 <br /> Nickel, TR ug/L 28 12 90 - - 70 1 <br /> Nickel, Diss ug/L 142 60 90 - - 70 1 <br />• <br />