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Ckw= <br /> Chevron <br /> 2.) Considering the above observations, the low historic levels of dissolved hydrocarbons (<100 <br /> ppb), and the recent non-detect levels measured, soils surrounding monitoring well MW-5 <br /> should also not be considered as potential sources of groundwater contamination. <br /> 3.) Monitoring wells MW-1, MW-4, and MW-6 have not been recently sampled due to low <br /> groundwater levels. Historic sampling of each has detected mcasureable concentrations of <br /> dissolved hydrocarbons. A review of all soil analytical data indicates that these wells are not <br /> located in contamination source areas. As a result, the suspected source of groundwater <br /> contamination in these wells was thought to be from surface runoff through leaky wellheads. If <br /> there is any residual hydrocarbon contamination remaining in these areas it is isolated and <br /> probably limited to within the well sand pack. As such, any residual hydrocarbons would be <br /> removed during the course of well abandonment. <br /> Chevron believes that the recent overexcavation onsite was successful in removing all potential <br /> sources of groundwater contamination. The information presented above also serves to <br /> demonstrate that other perceived sources of contamination do not exist. With this information at <br /> hand, it seems appropriate that this case be certified for closure. As soon as this decision is made <br /> Chevron is prepared to abandon all groundwater monitoring wells to accommodate the pending <br /> property development. <br /> Upon your review of this information, I would appreciate meeting with you to discuss the case <br /> closure details, as well as, answer any questions that you may have. Please tail me to arrange for a <br /> convenient meeting date and time. I will be coordinating this meeting with the property owner, Mr. <br /> George Spanos, who is also very interested in the progress towards case closure. <br /> Your prompt reply would be appreciated. I can be reached at(510) 842-8695. <br /> Sincerely, <br /> Brett L. Hunter <br /> Environmental Engineer <br /> Site Assessment and Remediation <br /> Attachment <br /> cc. Elizabeth Thayer, Central Valley Regional Water Quality Control Board, Sacramento, CA <br /> A.G. Spanos Construction, Inc., 1341 W. Robinwood Dr., Stockton, CA 95207 <br /> Bill Scudder, Chevron USA Products Company, San Ramon, CA <br /> Pat Durkin, Chevron USA Products Company, San Ramon, CA <br />