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J <br /> 1 <br /> toluene, 6 3 ppb ethylbenzene, and 146 ppb xylenes), MW-8 (261 ppb gasoline, 2 7 ppb benzene, 0 6 ppb <br /> ethylbenzene, and 1 4 ppb xylenes), MW-9 (137 ppb gasoline, 1 5 ppb benzene and 0 6 ppb xylenes), and <br /> MW-10 (54 5 ppb gasoline) Hydrocarbons were not detected in the sample collected from MW-7 Low <br /> concentrations of MTBE were detected in the groundwater samples collected from MW-4 (8 3 ppb) and MW- <br /> 5 (12 2 ppb), however, it was not detected in any of the other samples Table 2 in the attached report <br /> summarizes groundwater analytical data and laboratory reports are included as Appendix B <br /> The highest concentrations of hydrocarbons appear to remain onsite in the vicinity of the pump islands The <br /> groundwater plume does not appear to be migrating to any great extent When compared to the January <br /> 1998 sampling event, groundwater concentrations increased in MW-1, MW-2, MW-3, MW-5 and MW-6, while <br /> they remained relatively unchanged in the remainder of the wells Changes in hydrocarbon concentrations <br /> are most likely a result of changes in groundwater elevation Additional monitoring data will be collected to <br /> further evaluate the extent of the dissolved hydrocarbon plume <br /> AdAitional Site Activities <br /> At this time SECOR is preparing a corrective action plan which will evaluate several technologies for <br /> addressing sod and groundwater impacts at the subject site, and discuss which is most appropriate Upon <br /> completion, this report will be forwarded for your review <br /> If you have any questions regarding these matters, please do not hesitate to contact me at(206) 286-4495 <br /> Sincerely, <br /> Time Oil Co <br /> Anastasia E Duarte-Wilkinson <br /> Environmental Toxicologist <br /> cc Ms Elizabeth Thayer <br /> California Regional Water Ouahty Control Board <br /> jei9ew049136 doe <br /> 2 <br />