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• Lead (Pb). A total of 10 Southfield samples were analyzed for lead. <br />The average value of these samples was 1.8 ppm with a low of 0.8 ppm in <br />a Red Arrow roof sample, (SR-46), and a high of 2.7 ppm in a Jack <br />O'Lantern roof sample, (SR-46). With a suitability limit of 10 ppm no <br />problems with toxicity or groundwater quality are anticipated. <br />Manganese (Mn). A total of 10 Southfield samples were analyzed for <br />manganese. The average value of these samples was 3.0 ppm with a low of <br />0.5 ppm in a Jack O'Lantern floor sample, (SR-49), and a high of 4.2 ppm <br />in Jack O'Lantern and Red Arrow floor samples, (SR-46). Under acidic <br />conditions an upper limit of 10 ppm is considered marginally toxic. Under <br />neutral or alkaline conditions, 60 ppm is considered the suspect limit. <br />None of the Southfield samples approach either limit. Therefore, no <br />problems with revegetation toxicity or groundwater quality are <br />anticipated. <br />• Molybdenum (Mo). A total of 10 Southfield samples were analyzed for <br />molybdenum. The average value of these samples was -0.1 ppm with no low <br />or high values. With suspect level of 3.0 ppm set forth in the Montana <br />Guidelines, no problems with toxicity or groundwater quality are <br />anticipated. <br />Mercury (Hal. A total of ]0 Southfield samples were analyzed for <br />mercury. The average value of these samples was -0.01 ppm with lows of <br />-0.01 ppm found in roof and floor samples of both seams and a high of 3.6 <br />ppm in a Jack O'Lantern roof sample, (SR-46). All but one of the mercury <br />values were 0.01 ppm or lower. With a suspect level of 0.5 ppm as <br />presented in the Montana Guidelines, no problems with toxicity or <br />groundwater quality are anticipated. <br />Nickel (Nil. A total of 10 Southfield samples were analyzed for nickel. <br />All sample values were -0.1 ppm with no high or low values. The Montana <br />Guidelines set a suspect range for nickel of 1.0 to 5.0 ppm. Therefore, <br />. no problems with revegetation toxicity or groundwater quality are <br />anticipated. <br />2.04.6-26 <br />