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The general quality of ground water in the Trapper Mine vicinity appears <br /> to be good. Total dissolved solids for all wells is less than 1,000 <br /> mg/l, which means [h a[ [he water is classed as " fresh" in [he U.S. <br />Geological Survey classification. The dominant cation in all wells, <br />except GE-1, is calcium. In Well GE-1, Sodium is the dominant cation, <br />and the calcium content is quite low. The dominant anion in all wells is <br />bicarbonate. The dominance of the calcium and bicarbonate species <br />indicates [hat the water is relatively hard. <br />The minor element and [race element content of the groundwater is gener- <br />ally very low. Many of the parameters measured were found to be at or <br />below the detection limit of the methods used. However, some consti- <br />[vents are above [he National Interim Primary Drinking Water Standards <br />(NIPDWS). The concenta[ion of lead was found to be at or above the <br />•\1 standard of 0.05 mg/1 in some samples from Wells GA-l, GB-2, GC-1, and <br />GE-l. The selenium levels were analyzed a[ or above the standard of 0.1 i <br />mg/1 in a few samples from Wells GA-1 (one sample), GE-1 (two samples), <br />and GE-1 (one sample). The arsenic standard (0.05 mg/1) is not exceeded <br />in any well but the levels approach the standard in Wells GA-1, GC-1, <br />CD-1, and GE-1, For [he National Secondary Drinking Water Regulations <br />(NSDWR), it appears [hat both iron and manganese levels may exceed the <br />recommended limits. The iron content exceeds the limit of 0,3 mg/1 in all <br />wells. The manganese recommended limit (0,05 mg/1) is exceeded in all <br />wells except GD-1. The pH of all wells except CE-1 falls within [he <br />recommended range of 6.5 to 8.5. Copper levels in Wells GA-1, <br />~, <br />=40- <br />