Laserfiche WebLink
Sctvar - 2.04.7 <br />Only 3 of the 30 samples evaluated did not meet the suitability criteria and two of these were <br />• associated with coal seams, which will be removed. <br />The average acid-base potential was 54 tons of CaODs/kT and the mwmum and ~*+~x+rr+um values <br />were -11 and 130 tons of Ca0O,/kT, respectively. Given that the average AB value u relatively high <br />and that the majority of the samples fall within the suitabilitylimiu, no problems are anticipated with <br />respect to long-term aud-generation from the coal mining waste materials. <br />Sulfur Forms (S) -The sulfur forms data were used for calculating the acid-generation potential of the <br />material. Pyritic sulfur content was converted to an equivalent weight of calcium carbonate by <br />assuming that 31.25 tons of calcium carbonate are required to neutralize 1,000 tons of material that <br />contains 1 percent sulfur by weight. This conversion is based on ideal chemical reactions and assumes <br />that the pyritic sulfur in the material is completely converted to acid. <br />Saturation Percentage (SP) -Saturation percentage is used to evaluate the relative proportion of void <br />space filled with water and the capacity of the material to swell when saturated. A suitability criteria of <br />25 percent >SP <80 percent was used to evaluate the analysis data. The data set contained 30 values <br />for saturation percentage with a mean of 31 percent and a minimum and maxirnum of 21 percent and <br />64 percent, respectively. The majority of the samples analyzed met the suitability criteria and the <br />samples which fell below the loner SP limit of 25 percent were within a few percent of the limit value, <br />therefore, no problems are anticipated with respect to the saturation or swelling of the coal mining <br />waste material. <br />Arsenic (As) -Arsenic values ranged from less than 0.01 ppm to 0.58 ppm with a mean value of <br />approximately 0.2 ppm All of the samples are well below the suitability criteria of 2.0 ppm, <br />therefore, no problems are anticipated with respect to arsenic mobilization. <br />• Boron (B) -Boron values ranged from less than 0.01 ppm to 3 ppm with a mean value of <br />approxunately 1.2 ppm All of the samples are well below the suitability criteria of 5.0 ppm, therefore, <br />no problems are anticipated with respect to boron mobilisation. <br />Iron (Fe) -Iron values ranged from less than 2.1 ppm to 840 ppm with a mean value of approximately <br />57 ppm These concentrations do not present a potential problem with respect to iron mobilization <br />due to universally high pH values for the potential coal waste materials, which will limit iron solubility <br />(refer to the previous discussion on pI~. <br />Molybdenum (Mo) -Forty-three of the foray-six samples analyzed for molybdenum reported <br />concentrations less than the detection limiu. only one of the remaining samples reported a value <br />greater than the suitability limit of 1.0 ppm, and that sample (WSG4a) was orily slightly over at 128 <br />ppm No problems are, therefore, anticipated with respect to molybdenum mobilization. <br />Selenium (Se) -Selenium concentrations ranged from less than 0.01 ppm to 0.16 ppm with a mean <br />value of less than 0.06 ppm These values are well below the suitability criteria of 2.0 ppm, therefore, <br />no problems are anticipated with respett to selenium mobilization. <br />Ntrate-Nitrogen (N-N) - Ntrate-nivogen concentrations ranged from less than 0.1 ppm to 5.6 ppm <br />with a mean value of less than 0.2 ppm These values are well below the suitabilitycriteria of 50 ppm <br />for aquifer restoration, therefore, no problems aze anticipated with respect to nitrate-nitrogen. <br />Sodium Adsorption Ratio (SAR) -The sodium adsorption ratio u a measure of exchangeable sodium <br />. in the material matrix. Sodium adsorption ratios ranged from 1.5 to 76 with a mean value of 23.8. <br />Thin seven of the forty4eight values exceeded the suitability criteria of 10. SAR is only one <br />indication of potential salinity problems caused by sodium mobilization in mine soils. The potential <br />for sodiciry in mine soils is also a function of moisture content and hydraulic conductivity. In poorly <br />drained (low hydraulic conductivity) materials, sodium may accumulate and become phytotoxic. In <br />PR04 2.04-16 Revised May 2001 <br />