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10 August 2007 <br /> AGE-NC Project No.06-1481 <br /> Page 4 of 5 <br /> TPH-g-range hydrocarbons were detected in grab ground water sample 136-W at a concentration of <br /> 120 micrograms/liter (µg/1) utilizing EPA Method 8015M. The volatile organic compounds <br /> trichloroethene (TCE) and tetrachloroethene (PCE) were detected in sample 136-W utilizing EPA <br /> Method 8260 at concentrations of 5.2 µg/1 and 110 µg/1, respectively; both of the TCE and PCE <br /> concentrations are above the State of California Department of Health Service's Maximum <br /> Contaminant Level (MCL)for these chemicals of 5.0 µg/1 in drinking water. <br /> CTEL confirmed that the TPH-g-range hydrocarbons were probably due to the presence of solvents, <br /> and not TPH-g. Since the total concentration of PCE and TCE in sample B6-W was close to that of <br /> the TPH-g-range hydrocarbons,AGE concludes that the"TPH-g" detected by method 8015M was <br /> actually the TCE and PCE detected by method 8260. <br /> No other COC were detected in the analyzed soil or grab ground water samples. The analytical <br /> results are summarized in Tables 1 and 2.A copy ofthe laboratory report(CTEL Project No.CT214- <br /> 0707201) is included in Appendix A. <br /> LIMITATIONS <br /> AGE's professional services were performed using that degree of care and skill ordinarily exercised <br /> by environmental consultants practicing in this or similar localities. The findings were based <br /> primarily upon analytical results provided by an independent laboratory. Evaluations of the <br /> geologic/hydrogeologic conditions at the site for the purpose of this investigation were made from <br /> a limited number of available data points (i.e.,soil borings, soil sample and ground water samples) <br /> and subsurface conditions may vary beyond these data points. No other warranty, expressed or <br /> implied, is made as to the professional recommendations contained in this report. <br /> Advanced GeoEncironmental,Inc. <br />