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ANALYTE CONCENTRATIONS IN SOIL <br /> Soil from borings MW6 through MW8, BH7, and BH8 indicated the following: j <br /> o Sodium concentrations, less than 10 feet, range from 188 to 2450 ppm. At depths <br /> greater than 10 feet, sodium concentrations range ,from 72 to 415 ppm. These are all <br /> below the mean concentration for native western'!.soils of 9700 ppm, determined by <br />' analysis of 744 samples. <br /> O Chloride concentrations, less than 10 feet, range !,from 24 to 3100 ppm. At depths <br /> 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 ppm 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, aluminumconcentrations range from 3289 to 8771 ppm. These are <br /> clearly nominal native concentrations as indicated from analysis of 770 soil samples from <br /> the Western United States which ranged from 5000 to more than 100,000 ppm. <br /> o Potassium concentrations,-less than 10 feet, range'']from 317 to 1952 ppm. At depths <br /> j greater than 10 feet, potassium concentrations range"from 59 to 1726 ppm. Again, these <br /> are normal concentrations (777 Western US soil samples ranged from 1900 to 63,000 <br /> Ppm) <br /> Naturally occurring soil concentrations cited above are taken from Elements in North American <br /> Soils (Dragun and Chiasson, 1991). <br /> 1 <br /> I <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 due to reverse ion exchange occurring <br /> in the relatively high TDS waters. <br /> i <br /> I <br /> gromdu\teichert\sitehist 3 <br />