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Chevron Products Company 3 <br /> Chevron Service Station 9-4275,2905 W.Benjamin Holt Drive,Stockton,California July 11,2001 <br /> of the former piping. The granular backfill of the piping was removed to reveal the <br /> native clayey sand soils. This depth interval was sampled at each location. <br /> No visual evidence or odors were present that suggested a release emanated from the <br /> product line or dispenser. <br /> Sample A was at the northwestern corner of the excavation for the piping. Sample B <br /> was collected approximately 20-feet southeast of sample A along the trend of the <br /> product piping and sample C was collected beneath the former dispenser location, <br /> approximately 10 feet southeast of sample B. <br /> The San Joaquin County representative noted the secondary containment piping around <br /> approximately I 0-feet of the product line had been previously removed and sealed. To <br /> ensure the lack of secondary containment had not led to soil impacts, two additional <br /> samples, B2 and B3 were collected. <br /> The soil samples were delivered to Sequoia Analytical in Sacramento, California and <br /> analyzed for total (purgeable) petroleum hydrocarbons as gasoline (TPHg), benzene, <br /> toluene, ethyl benzene, and xylenes (BTEX), fuel oxygenates and methanol. Fuel <br /> oxygenates include ethanol, tert-butyl ether (TBA), methyl tert-butyl ether (MtBE), di- <br /> isopropyl ether (DIPE), ethyl tert-butyl ether(EtBE), tert-amyl methyl ether (TAME), <br /> 1,2 dichloroethane (1,2 DCA) and ethylene dibromide (EDB). <br /> The laboratory did not detect concentrations of TPHg, BTEX, fuel oxygenates, or <br /> methanol at or above laboratory method detection limits. Field and laboratory <br /> procedures are presented in Appendix A. Certified laboratory reports and chain-of- <br /> custody documentation are presented in Appendix B. <br /> SUMMARY AND CONCLUSIONS <br /> No petroleum hydrocarbons were reported in soil samples collected during the removal <br /> of the methanol dispenser and product lines. Non-detectable concentrations of <br /> petroleum hydrocarbons reported in soil samples collected in the area of the dispenser <br /> and associated product lines suggest that no releases have occurred in these areas. <br /> If you have any questions or comments regarding this letter, please feel free to call us at <br /> (916) 861-0400. <br /> Sincerely, <br /> SECOR International Incorporated <br /> le, R. <br /> Project Manager <br /> 1:\Chevron1942751REPORTS\MeOH Line Abandonment Report.doc <br />