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it <br /> j <br /> 1 <br /> ANALYTE CONCENTRATIONS IN SOIL <br />!, Soil from borings MW6 through MW8, BH7, and BH8 indicated the following: <br /> o Sodium concentrations, less than 10 feet, range from 188 to 2450 ppm. At depths <br /> 11 <br /> greater than 10 feet, sodium concentrations range from 72 to 415 ppm. These are all <br /> below the mean concentration for native western 'lsoils of 9700 ppm, determined by <br /> analysis of 744 samples. <br /> o Chloride concentrations, less than 10 feet, range jfrom 24 to 3100 ppm. At depths <br /> j greater than 10 feet, chloride concentrations range from 48 to 611 ppm. By way of <br /> comparison, the mean chloride concentrations of 136 native soil samples from the great <br /> plains were 1600 pptn in the A Horizon and 810 ppm in the C Horizon. <br /> o Aluminum concentrations, less than 10 feet, range from 3914 to 8020 ppm. At depths } <br /> greater than 10 feet, aluminum concentrations range;from 3289 to 8771 ppm. These are <br /> clearly nominal native concentrations as indicated from analysis of 770 soil samples from i <br /> the Western United States which ranged from 5000;;to more than 100,000 ppm. <br /> o Potassium concentrations, less than 10 feet, range Ilfrom 317 to 1952 ppm. At depths <br /> greater than 10 fest, potassium concentrations ranged from 59 to 1726 ppm. Again, these f� <br /> are normal concentrations (777 Western US soil (samples ranged from 1900 to 63,000 <br /> ppm)- <br /> Naturally <br /> pm)Naturally occurring soil concentrations cited above are taken from Elements in North American <br /> Soils (Dragun and Chiasson, 1991). <br /> GROUNDWATER SAMPLING <br /> Groundwater sampling of wells MW6 through MW8 was started in November 1989. Sampling <br /> MW9 did not begin until June 1991. In the Preliminary investigation by LBME Corporation <br /> in December 1989, it is stated that the sodium levels in the groundwater (17.1 to 26.6 ppm) <br /> would indicate that high levels of chlorides are from other compounds such as potassium <br /> chloride and not from sodium chloride. Analysis by GZA using the Wateval program, however, <br /> indicates that sodium levels are proportionately diminished d'ue to reverse ion exchange occurring <br /> in the relatively high TDS waters. <br /> I <br /> I <br /> j <br /> grotmdze\t6chatlsitehi3t 3 <br />