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<br /> <br />3 <br /> <br />10 day Leachate EPA Drinking EPA W.Q. <br />Concentration mg/1 Water Req. mg/1 Criteria mg/1 <br /> <br />As - Arsenic 0.002 0.005 0.1 irrigation <br />Ba - Barium 0.046 1.0 50.0 aquatic <br />Cd - Cadmium 0.002 0.010 0.004 aquatic <br />Mo - Molybdenum 0.160 none 0.01 irrigation (FWPCA) <br />Pb - Lead 0.071 0.05 variable <br />Se - Selenium 0.02 0.01 variable <br />Zn - Zinc 0.047 5.0 variable <br />U -Uranium 86 --- 0.01 background level (USGS) <br />Ra -Radium 250 pCi/1 lOpCi/1 <br /> 1.7 pCi/1 (100 min. ret.) <br />The above results show that the raw leachate quality is in most cases at or <br />below drinking standards and well below Water Quality Criteria. Keep in mind <br />that these values do not include any dilution which would improve the water <br />quality. <br />The only significant concern with the above parameters is molybdenum. The <br />leachate concentration is well above irrigation standards. However, the <br />leachate from the pile will, at most, contaminate small patches of grass near <br />the base of the ore piles. The area of contamination is not extensive enough <br />to pose a problem to grazing wildlife in the area. And in fact, with dilution <br />or shorter retention times, there may not be any contamination. <br />RL/md <br />cc: Mike Long <br />Jim Pendleton <br />Document No. 4372E <br />