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{ t <br /> Site History <br /> 14000 Highway 88, Lockeford,CA <br /> Time Oil Property No,04-049 <br /> collected from MW-2 (175 ppb gasoline, 3.7 ppb benzene, 1.2 ppb toluene, 1.6 ppb ethylbenzene, and <br /> 8.3 ppb xylenes), MW-4 (284 ppb gasoline, 4.9 ppb benzene, 0.6 ppb toluene, and 0.7 ppb xylenes), <br /> MW-5 (122 ppb gasoline, 9.6 ppb benzene, 0.9 ppb toluene, and 1.5 ppb xylenes), and MW-8 (102 ppb <br /> gasoline and 10.1 ppb benzene). Hydrocarbons were not present at detectable concentrations in the <br /> samples collected from MW-7 or MW-10. <br /> Although the extent of groundwater impacts is only truly delineated in the upgradient (northeast) and <br /> downgradient (southwest) directions, it is generally defined and appears to remain limited to the vicinity <br /> of the pump islands. When compared to the August 1996 sampling event, groundwater concentrations <br /> showed slight increases in MW-1, MW-2, MW-3, MW-4, MW-5, and MW-8. A larger increase was noted <br /> in MW-9 (sidegradient). Hydrocarbon concentrations in MW-6 decreased slightly, while concentrations in <br /> MW-7 and MW-10 remained below detection limits. The observed fluctuations in hydrocarbon <br /> concentrations might have been a result of a changes in groundwater elevation; however, not enough <br /> data has been collected to evaluate their significance. Additional monitoring data will be collected to <br /> further evaluate the extent of the dissolved hydrocarbon plume. <br /> A copy of SECOR's "Quarterly Monitoring Report, October - December" dated February 28, 1997, was <br /> forwarded to the appropriate regulatory agencies on March 12, 1997. <br /> E <br />