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r <br /> KBI-,786-U31 <br /> September 8, 1986 <br /> ANALYTICAL RESULTS, Cont'd <br /> 1 THC Total volatile hydrocarbons <br /> 2 <br /> EDB Ethylene dibromide <br /> 3 BTX Benzene, Toluene, Xylene <br /> ppm parts Per million <br /> ND none detectable <br /> The results of the soil samples indicate very low to moderate <br /> concentrations of THC ranging from 13.0 to 150.0 ppm, lead <br /> concentrations level ranged 5.3 to 12. 0 ppm, EDB was non <br /> detectable..., BTX concentrations analyzed for soil below the 550 <br /> gallon tank were X0.001 ppm, The water sample results were non <br /> detectable level for all parameters tested. <br /> CONCLUSION <br /> The chemical results of the soil samples indicates low. <br /> concentrations of 'total dissolved hydrocarbons and lead, where as <br /> EDB and BTX were non-detectable. The water sample results showed <br /> non-detectable levels. for all `thP parameters. It is our <br /> conclusion that sufficient contaminated soil has been removed from <br /> the site to significantly reduce adverse environmental impact to <br /> the underlying groundwater. Although low concentration of. <br /> hydrocarbons exist in the soil, we believe natural biodegradation . <br /> and soil adsorption would further decrease the contamination over <br /> time, thus reducing potential impacts. The soil contamination . <br /> appears to be localized and in our opinion the levels detected <br /> were , .low that the need for further testing or removal <br /> _ ._ <br /> is unnecessary. Level's of lead detected is common in the central <br /> valley and in other areas of California. According to the State <br /> Department of Water Resources the shallow groundwater in the City <br /> of. Tracy is of inferior. quality and is not used for domestic ' <br /> puposes. <br />