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Mr Harlin Knoll Environmental <br /> 9 November 2000 Resources <br /> Page 4 Management <br /> • <br /> detection limits TPH-g was detected at a concentration of 220 µg/l and <br /> toluene, ethylbenzene, and xylenes were detected at concentrations of <br /> 0 58, 0 63, and 11 µg/1, respectively Based on these low concentrations, <br /> the vertical extent of impacts at this location appears to have been <br /> defined <br /> Conclusions <br /> Based on the sampling results presented in this letter, the vertical extent <br /> of impacts has been defined at each former tank site The lateral extent of <br /> impacts has been defined during previous investigation activities <br /> conducted at the site Therefore, no additional investigation activities <br /> should be required to define the extent of impacts at the former tank site <br /> The results of ground water samples collected in shallow monitoring <br /> wells indicate that chemical concentrations at each tank site are stable or <br /> decreasing As presented in the Underground Storage Tank Closure Report, <br /> natural attenuation will continue to reduce the chemical concentrations <br /> • in ground water at each former tank site In accordance with the <br /> workplan, another round of ground water sampling will be conducted at <br /> the site in early January 2000 <br /> We would appreciate a written response from the County regarding the <br /> conclusions presented in this letter If you have any questions regarding <br /> the well installation activities or ground water sampling results, please <br /> call me at (925) 946-0455 <br /> Sincerely, <br /> Matthew L Brandy <br /> Project Manager <br /> cc Mr Scott Krall, Heinz -Pittsburgh, PA <br /> Mr Marty Hartzel, CVRWCB <br /> Ms Margaret Lagorio, SJCEHD <br /> Mr James F Devenport, The Cranbrook Group <br /> i <br />