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1 <br />L <br />5, SB -1, and SB -2. Deep soil samples were collected during the drilling of MW -1, <br />MW -2, and MW -3. A summary of the vadose zone soils collected for chemical analysis <br />is shown in Table 1. <br />A volatile organic compound TCA was detected in the shallow and deep soil samples <br />from MW -2. As previously discussed, the results of the laboratory blank sample <br />analyzed along with this sample also indicated the presence of TCA at 10ug/kg; <br />therefore, this compound appears to be a laboratory contaminant introduced during the <br />analytical process. No semivolatile or organochlorine pesticide/PCB compounds were <br />detected in the soil samples from MW -2. No volatile, semivolatile, or organochlorine <br />pesticide/PCB compounds were detected in other shallow or deep soil samples collected <br />during the SWAT program. <br />A volatile organic compound (toluene) was detected in the deep soil sample from MW -1 <br />at a concentration of 12 ug/kg. during a previous investigation (EMCON, January <br />1988). No other volatile, semivolatile, or organochlorine/PCB compounds were <br />detected in the shallow or deep soil samples from MW -1. The presence of toluene was <br />not thought to be significant since it was not detected in either the shallow soil sample or <br />the ground -water sample. In addition, other compounds typically associated with <br />toluene (e.g. benzene or xylenes) were not detected in any of these samples. <br />Evaluating landfill impacts on the deep vadose soils with respect to metals is not <br />possible because both samples were collected from upgradient locations (MW -2 and <br />MW -3). The concentrations of metals detected in the shallow soil samples were similar <br />across the site. <br />Based on the evaluation of organic data, the landfill does not appear to have impacted <br />the deep and shallow vadose zone soils near the landfill. <br />4.3.4 Comparison to Regulatory Standards and Criteria <br />To place the results of this SWAT program into perspective, a comparison of the <br />analytical results with the available regulatory standards and criteria may be helpful. <br />The standards and criteria presented for comparison in Tables 3 through 7 are those for <br />Fr +�'bnOFAMN <br />