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Site History <br /> 14000 Highway 88 Lockeford CA <br /> Time ad Property No 04-049 <br /> Analyses Identified elevated concentrations of hydrocarbons in the samples collected from MW-1 (6,570 ppb <br /> gasoline, 304 ppb benzene, 1,410 ppb toluene, 1,020 ppb ethylbenzene), MW-2 (875 ppb gasoline, 23 9 ppb <br /> benzene, 38 3 ppb toluene,,5 3 ppb ethylbenzene, and 241 ppb xylenes), and MW-3 (935 ppb gasoline, 235 <br /> ppb benzene, 0 7 ppb toluene, 35 1 ppb ethy[benzene, and 24 5 ppb xylenes) Lower concentrations of <br /> hydrocarbons were found in the samples collected from MW-4 (342 ppb gasoline, 44 3 ppb benzene, 8 6 ppb <br /> ethylbenzene, and 1 8 ppb xylenes), MW-5 (102 ppb gasoline, 6 2 ppb benzene, 0 8 ppb ethylbenzene, and <br /> 3 6 ppb xylenes), MW-6 (166 ppb gasoline, 18 8 ppb benzene, 2 0 ppb ethylbenzene, and 19 2 ppb xylenes), <br /> MW-8 (1 2 ppb benzene and 0 5 ppb xylenes), and MW-9 (61 ppb gasoline and 16 ppb toluene) <br /> Hydrocarbons were not detected in the samples collected from MW-7 or MW-10 Low concentrations of <br /> MTBE were detected In the groundwater samples collected from MW-2 (5 4 ppb), MW-3 (9 3 ppb), MW-4 <br /> (12 6 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 MW-3) The groundwater plume does not appear to be migrating to any great extent When compared <br /> to the October 1997 sampling event, groundwater concentrations decreased in MW-1, MW-3, MW-5, MW-6, <br /> and MW-9, while they remained relative[y unchanged in the remainder of the wells <br /> A copy of SECOR's "Quarterly Monitoring Report, Janaury - March 1998" dated April 15, 1998, was <br /> forwarded to the appropriate regulatory agencies on May 4, 1998 <br /> 16 <br />