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xylenes The sample collected from MW-2, located to the east of the former tank bed (side gradient), <br /> was not found to contain detectable concentrations of gasoline or its constituents Table 2 in the <br /> attached report summarizes historical analytical data, and the 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 Third <br /> and Fourth Quarters of 1995, gasoline and BTEX concentrations increased slightly in MW-4, however, <br /> they decreased in MW-1 MW-2, and MW-3 The observed fluctuations in hydrocarbon concentrations <br /> may be a result of seasonal variation in groundwater levels and/or a result of bioattenuation, however, <br /> not enough data has been collected to evaluate their significance Future data will be used to evaluate if <br /> significant trends in hydrocarbon concentrations in groundwater exist <br /> Future Site Activities <br /> A workplan has been submitted to the PHS/EHD for the installation of six additional monitoring wells to <br /> define the extent of soil and groundwater impacts associated with the former underground storage tanks <br /> at the subject site Upon approval of the workplan, additional investigative activities will be scheduled <br /> If you have any questions or comments regarding this project, please do not hesitate to contact me at <br /> (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 /> feb98%4049119 doc <br />