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Site History <br /> • 14000 Highway 88,Lockeford,CA <br /> Time Oil Property No 04-049 <br /> Analyses identified elevated concentrations of hydrocarbons In the samples collected from MW-1 (18,500 <br /> Ppb gasoline, 386 ppb benzene, 2,580 ppb toluene, 1,080 ppb ethylbenzene, 2,820 ppb xylenes), MW-2 <br /> (1,910 ppb gasoline, 318 ppb benzene, 12 8 ppb toluene, 2 0 ppb ethylbenzene, and 274 ppb xylenes), MW- <br /> 3 (838 ppb gasoline, 126 ppb benzene, 17 0 ppb toluene, 47 6 ppb ethylbenzene, and 77 8 ppb xylenes), <br /> MW-4 (901 ppb gasoline, 187 ppb benzene, 4 7 ppb toluene, 84 4 ppb ethylbenzene, 7 2 ppb xylenes), MW- <br /> 5 (5,600 ppb gasoline, 430 ppb benzene, 279 ppb toluene, 211 ppb ethylbenzene, and 1,130 ppb xylenes), <br /> and MW-6 (310 ppb gasoline, 24 6 ppb benzene, 1 9 ppb toluene, 7 6 ppb ethylbenzene, 55 5 ppb xylenes) <br /> Lower concentrations of hydrocarbons were found In the samples collected from MW-8 (1 8 ppb benzene) <br /> and MW-9 (76 5 ppb hydrocarbons and 2 8 ppb benzene) Hydrocarbons were not detected in the samples <br /> collected from MW-7 and MW-10 Low concentrations of MTBE were detected in the groundwater sample <br /> collected from MW4 (41 2 ppb), however, it was not detected in any of the other samples <br /> The highest concentrations of hydrocarbons appear to remain onsite in the vicinity of the pump islands (MW- <br /> 1) and sidegradient of the former tank bed (MW-5) The groundwater plume does not appear to be migrating <br /> to any great extent When compared to the August 1998 sampling event, hydrocarbon concentrations <br /> increased somewhat In MW-2 and decreased slightly in MW-4, while they remained relatively unchanged in <br /> the remainder of the wells Changes In hydrocarbon concentrations are most likely a result of changes In <br /> groundwater elevation Additional monitoring data will be collected to further evaluate the extent of the <br /> dissolved hydrocarbon plume <br /> A copy of SECOR's "Quarterly Monitoring Report, October- December 1998" dated January 27, 1999, was <br /> forwarded to the appropriate regulatory agencies on February 1, 1999 <br /> • <br /> • <br /> 22 <br />