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' S ECOR ' Request for No Further Action Chevron Station 9-2396 December 16,2004 Page 4 was transported for proper disposal to Stockton, California by Forward Landfill, Inc During the UST removal and excavation, three new 12,000-gallon USTs were installed, with ' associated product piping and new pump islands Laboratory analytical results for the soil samples contained low concentrations (1 9 ppm to 410 ppm) of total petroleum hydrocarbons quantified as gasoline (TPHg), benzene (0 008 ppm to 0 11 ppm), toluene (0 009 ppm to 6 7 ppm), ethylbenzene (0 008 ppm to 6 9 ppm), and xylenes (0 009 ppm to 46 ppm) ' Domestic Water Well Sampling — 1994 On June 24 and July 28, 1994, water samples were collected from the domestic water supply well located on the edge of the property, near the Frontage Road and approximately 60 ft west of the pump islands Laboratory analytical results reported no detectable TPHg or BTEX at or above method detection limits Action levels for likely chemical constituents based on preliminary remediation goals (PRG) and California Environmental Protection Agency (Cal/EPA) established values, can be seen in Table 1 Site Assessment— 2001 lie On April 26 and April 27, 2001, SECOR supervised the advancement of three soil borings (SB-1, SB-2, and SB-3) to 79 feet below ground surface (bgs) Two soil samples and one groundwater "grab" sample from each boring were submitted for analysis for TPHg, BTEX, tert-butyl alcohol (TBA), methyl tert-butyl ether (MtBE), dl-Isopropyl ether (DIPE), ethyl tert-butyl ether (EtBE), tert-amyl methyl ether (TAME), ethanol, 1-2 dichloroethane (1-2 DCA), ethylene dibromide (EDB), and total lead Soil sample analytical results Indicated no petroleum hydrocarbon concentrations above method detection limits (Table 2) The field and laboratory procedures are contained In Appendix B ' Low concentrations of toluene ranging from 0 617 micrograms per liter (µglL) to 0 893 µglL and xylenes ranging from 1 17gg/L to 1 48 ttglL were detected in the groundwater "grab" ' samples collected from borings SB-1 and SB-3 MtBE was reported in the SB-1 groundwater sample at a concentration of 13 0 µg/l_ The on-site domestic water supply well was also sampled and determined to be free of any chemical constituents analyzed for ' by the laboratory The field boring logs are contained in Appendix C Site Assessment— 2002 ' On May 14 and May 15, 2002, SECOR supervised the advancement of three soil borings to a maximum depth of 85 feet bgs and the installation of groundwater monitoring wells MW-1 ' through MW-3 in each of the borings Up to seven soil samples from each soil boring were submitted for analysis of TPHg, BTEX, and MtBE Soil sample analytical results reported no hydrocarbon concentrations above method detection limits ' I 1Chevron1923961Reports\FINAL_NFAR_REPORT doc