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Conclusions <br /> Results of the recent quarterly monitoring event indicate that the extent of hydrocarbon-impacted <br /> groundwater at the site has been relatively well defined to the west, however, it remains undefined to the <br /> north, south and east of the former tank bed Hydrocarbon concentrations have decreased in the <br /> perimeter wells (MW-2, MW-3, and MW-4), and increased in MW-1, however, not enough data has been <br /> collected to evaluate the significance of these variations Future data will be used to evaluate if <br /> significant trends in hydrocarbon concentrations in groundwater exist Groundwater levels have <br /> decreased somewhat across the site (most likely a result of seasonal variation) since the previous <br /> sampling event, although flow direction has remained consistent <br /> Future Site Activities <br /> SECOR is preparing a cost estimate for the installation of additional monitoring wells to define the extent <br /> of soil and groundwater impacts associated with the subject site Data collected to date indicate that it <br /> will be necessary to install several wells offsite Upon completion, a workplan for the additional <br /> investigation will be forwarded for your review Field activities will be scheduled once the workplan has <br /> been approved and site access has been granted for work to be performed on adjacent properties <br /> Should you have any questions regarding these matters, please do not hesitate to contact me at (206) <br /> 286-4495 If I am unavailable, Kevin Murphy may be able to answer any questions that you may have <br /> Sincerely, <br /> Time Oil Co <br /> Anastasia E Duarte <br /> Environmental Toxicologist <br /> cc Ms Elizabeth Thayer <br /> California Regional Water Quality Control Board <br /> lu19514049115 doc <br />