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r <br /> contained 170 ppb gasoline, 10 ppb benzene, 3 6 ppb ethylbenzene, and 0 5 ppb xylenes Table 2 in <br /> the attached report summarizes historical analytical data, and laboratory reports for the most recent <br /> sampling event are included as Appendix B <br /> Conclusions <br /> To date, the extent of groundwater impacts have not been defined in any direction Between the Fourth <br /> Quarter 1995 and First Quarters of 1996, gasoline and BTEX concentrations increased in MW-11, MW-2, <br /> and MW-3 and decreased in MW-4 The observed fluctuations in hydrocarbon concentrations may be a <br /> result of a general increase in the groundwater elevation, however, not enough data has been collected <br /> to evaluate their significance Future data will be used to evaluate if significant trends in hydrocarbon <br /> concentrations in groundwater exist <br /> Future Site Activities <br /> On January 25, 1996, Time Oil submitted a workplan to the PHS/EHD for the installation of six additional <br /> monitoring wells to define the extent of sod and groundwater impacts associated with the former <br /> underground storage tanks at the subject site The PHS/EHD approved this workplan in correspondence <br /> dated March 6, 1996 At this time, SECOR is securing well drilling permits and preparing a cost estimate <br /> for the completion of the additional scope of work <br /> You will be contacted once field work has been scheduled so that you may arrange to be onsite should <br /> you wish to observe field activities If you have any questions or comments regarding this project, <br /> 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 Quality Control Board <br /> apraWO49120 doe <br />