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Sodium Absorption Ratio. The two values of SAR in the top and <br />bottom material of the C-Seam are 26.5 and 33.1. The SAR values <br />• of the B-Seam floor coal, B-Seam roof and the temporary waste <br />storage piles #1 and #2 are 7.1, 27.2, 31.1, and 33.9 respective- <br />ly. The values for Sodium Absorption Ratio are present because <br />of the high soluble sodium content in the sample material. All <br />of the samples except the B-Seam floor coal exceed the SAR stand- <br />ard of 12 which has been proposed by the Montana Department of <br />State Lands and the Wyoming Department of Environmental Quality. <br />Any of this material which is brought to the surface is currently <br />stored in a gob disposal area at the Somerset Mine, Elk Creek <br />Yard. No water is expected to discharge from the No. 3 Mine so <br />the high SAR value of the material inside the mine should not <br />pose a problem. <br />Boron. According to the suitability criteria of the Wyoming Land <br />Quality Division, none of the samples exceed the 5 ppm value. <br />Therefore, no problems are anticipated to occur as a result of _ <br />boron. <br />Chloride. The values for chloride in the top and bottom material <br />of the C-Seam are relatively low. No problems with respect to <br />chloride are anticipated. <br />Fluoride. The two samples for the top and bottom material of the <br />C-Seam indicate a fluoride value of only 0.1 part main ppm. <br />Therefore, no problems with respect to fluoride are anticipated. <br />Nitrate. Nitrogen. The suspect level of the Wyoming Land Quality <br />Division for nitrate, nitrogen has been set at values greater <br />than 50 ppm with regard to aquifer restoration. None of the <br />samples exceeded the 50 ppm limit. The average value for the <br />nitrate, nitrogen was less than 5 ppm. These values mean the <br />potential for groundwater contamination is extremely low. <br />Textural Analysis. Because of the amount of coal in top and <br />bottom material of the C-Seam, a textural analysis was not done <br />on the two samples. Coal in a sample will prohibit the chemist <br />from making a true determination of the texture. The results of <br />texture analyses with coal inherent in the sample are meaning- <br />less. The textural analysis of the B-Seam floor coal the B-Seam <br />roof and the temporary waste storage piles #land #2 show a high <br />sand content which is probably biased because of the coal content <br />of the samples. <br />Arsenic. Arsenic values in the samples are very low. No prob- <br />lems are expected with groundwater quality with respect to arse- <br />nic. <br />• 2.04-25 <br />Revised June 29, 1990 <br />