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' rinse in the laboratory to simulate additional rinsing by <br />rainwater following detoxification and to eliminate traces of <br />chemicals used to elevate pH levels in the leached ore. <br />' Both samples showed very similar test results, indicating <br />that the acid producing potential for heap leach ore is well <br />below the acid neutralizing potential. Based on the test <br />results, acid production should not occur. <br />The leachability tests showed both solutions as slightly <br />alkaline. Additional rinsing of the sample does riot appear to <br />consistently improve the sample quality. <br />t All parameters sampled were well within both drinking <br /> water standards and Rito Seco receiving stream standards. EP <br /> toxicity test results indicated most parameters below detection <br /> limits and all parameters far below toxicity standards set by <br /> the EPA. <br /> <br /> Humidity cell data show that the leached ore is not acid <br /> generating. <br />1 D.7.4 HeaQ Leach Pad Design and Construction <br /> D.7.4.1 Pad Area <br />1 <br /> A plan view, cross-sections, and typical details for the <br />' proposed heap leach pad are shown on Figures C-1(i, C-11, and <br /> C-12, respectively. The leach pad is sized for processing up <br />1 to 6.5 million tons of ore at an assumed density of 100 pcf <br /> placed to a depth of 100 ft in 20-ft lifts. Ore F~lacement is <br /> anticipated year-round at a rate of 2,500 tpd or 500,000 tons <br />Th <br />d <br />t <br />t <br />i <br />i <br />l <br />1 <br />500 <br />ft l <br /> per year ( <br />e pa <br />area <br />s approx <br />py). <br />ma <br />e <br />y <br />, <br />- <br />ong <br /> and 1,500-ft wide, and covers a total of about 2,135,000 sq <br /> ft. The pad area will be constructed in stages .as shown on <br /> Figures D.7.4.1-1, D.7.4.1-2, D.7.4.1-3 and D.7.4.1-4. The <br /> <br />' D-43 <br />