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Ammonium (N03-N). A total of 10 Southfield samples were analyzed with <br />respect to ammonium. Values of ammonium ranged from 6 ppm in a Red Arrow <br />floor sample (SR-50), to 94 ppm in a Jack O'Lantern roof sample (SR-49), <br />with an average value of 59 ppm. While no regulatory suspect level exists <br />at this time, Barth et. al., (1981) recommended a toxicity threshold of <br />160 pp. Using an upper limit of 160 ppm, all Southfield sample values <br />fall into the acceptable range. Given site groundwater characteristics, <br />these levels should not effect groundwater quality. <br />Sulfate (S04). A total of 10 Southfield samples were analyzed with <br />respect to sulfate. Values of sulfate ranged from 9 ppm in a Red Arrow <br />floor sample (SR-50), to 210 ppm in a Red Arrow roof sample (SR-50). The <br />average value of sulfate is 53 ppm but the Red Arrow strata average was <br />93 ppm compared to the Jack 0' Lantern strata average of 26 ppm. No <br />suitability limits exist for sulfate, however, given site groundwater <br />characteristics, these levels should not effect groundwater quality. <br />• Arsenic (As). A total of 10 Southfield samples were analyzed for arsenic. <br />The average value of these samples was 0.1 ppm with a range from -0.1 ppm <br />to a high of 0.4 ppm in a Red Arrow floor sample. All analysis values are <br />well below the published suitability limit of 2.0 ppm so no problems with <br />revegetation toxicity or groundwater quality are anticipated. <br />Barium (Ba). A total of 10 Southfield samples were analyzed for barium. <br />The average value of these samples was -0.1 ppm with no traceable high or <br />low values. Due to these low values, no problems with toxicity or <br />groundwater quality are anticipated. <br />Boron 6 A total of 10 Southfield samples were analyzed for boron. The <br />average value of these samples was 0.4 ppm with a low of 0.3 ppm in floor <br />samples for both seams and a high of 0.5 ppm in the Jack O'Lantern roof <br />and floor at SR-46. These values are well below the 5.0 ppm suitability <br />limit commonly utilized for boron. No problems with revegetation toxicity <br />• or groundwater quality are anticipated. <br />2.04.6-24 <br />