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d <br /> 5 Groundwater is not impacted Nine groundwater sampling events have been conducted over a <br /> period of four years Only two samples have ever contained hydrocarbons the sample from MW-3 <br /> in November 1992 (0 55 ppb xylenes) and the sample from MW-6 in December 1993 (0 06 ppb <br /> toluene) Hydrocarbon contaminants have not been observed in the seven additional groundwater <br /> sampling events conducted from July 1994 to May 1996 <br /> Should the PHS/EHD determine that site closure is appropriate, a workplan will be generated for proper <br /> decommissioning of the groundwater monitoring wells and vapor extraction wells present on the subject <br /> site if you have any questions regarding this project, please do not hesitate to contact me at (206) 286- <br /> 4495 <br /> Sincerely, <br /> Time Oil Co <br /> A.k"'o�(' Zt,--D4 V 1kL":9 <br /> Anastasia E Duarte-Wilkinson <br /> Environmental Toxicologist <br /> cc Ms Elizabeth Thayer <br /> California Regional Water Quality Control Board <br /> oct98l4167128 doc <br />