Laserfiche WebLink
S ECOR <br /> Ms. Devra Lewis <br /> August 12, 2004 <br /> Page 3 <br /> Analytical Results <br /> Quantification of TPHj in the soil and groundwater samples analyzed by Lancaster was <br /> accomplished by comparing the results to a jet fuel standard. Because Lancaster <br /> compared the analytical results to a TPHj standard, they reported the results as TPHj. <br /> Therefore, Lancaster reported detectable concentrations of TPHj, but noted that "the <br /> sample fingerprint was more similar to gasoline than jet fuel." Copies of Lancaster <br /> analytical reports and chain-of-custody documentation are included in Attachment 3 <br /> After comparison of the chromatograms for the soil and groundwater samples and <br /> reference chromatograms for TPHg and TPHj, ETC concluded that although carbon chain <br /> molecules in the TPHj range were present in the soil and groundwater samples, these <br /> constituents were more representative of the heavy ends of gasoline range petroleum <br /> hydrocarbons. (e.g., TPHg and TPHj). A more thorough comparison of the sample <br /> chromatograms to reference chromatograms for TPHg and TPHj, conducted by ETC, <br /> indicated that the detected constituents were more characteristic of weathered TPHg than <br /> TPHj. Chromatograms for the soil and groundwater samples and reference chromatograms <br /> for TPHg and TPHj, and copies of ETC analytical reports and chain-of-custody <br /> documentation are included in Attachment 4. <br /> Field and laboratory procedures are included in Attachment 5. Soil analytical results are <br /> presented in Tables 1 and 2. Groundwater analytical results are presented in Tables 3 and <br /> 4. <br /> CONCULSIONS <br /> Although Lancaster reported detections of petroleum hydrocarbons, including jet fuel, <br /> Lancaster concludes that the sample fingerprint for these detections was more <br /> characteristic of a weathered, degraded gasoline than jet fuel. In addition, ETC concludes <br /> that "while jet-range hydrocarbons are present, these samples do no contain jet fuel, rather <br /> the chromatograms are dominated by the heavy ends of gasoline boiling higher than <br /> approximately C8." Therefore, SECOR concludes that it is unlikely that a release has <br /> occurred or is currently ongoing from the Pipeline in the vicinity of MP 9.90. Detections of <br /> petroleum hydrocarbons in soil and groundwater are likely a result of an upgradient release. <br /> I:\Chevron\32792\Reports\Chevron Pipeline Assessment Report RevA.doc <br />