2008-03-03_PERMIT FILE - C2006085 (18)

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