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•1 <br /> 4 Because adequate groundwater data has been collected, semi-annual groundwater sampling (rather <br /> than quarterly groundwater sampling), may be conducted until closure of the site has been granted <br /> At this time, SECOR is generating a cost estimate and scope of work for verification sampling and <br /> evaluating the biodegradation of hydrocarbons in the site's soils Upon completion, the workplan will be <br /> submitted for your review and comment SECOR will conduct the next groundwater sampling event <br /> during the Second Quarter of 1996 <br /> Additional Information <br /> The PHS/EHD recently requested information with respect to Time Oil's use of the gasoline additive <br /> MTBE Although site-specific information regarding the use of MTBE-containing gasoline was not readily <br /> available, it is my understanding that MTBE 1s added to gasoline which is delivered to storage facilities <br /> in the Central Valley during those months in which oxygenated fuel usage 1s required Accordingly, <br /> gasoline containing MTBE may have been delivered to the underground storage tanks at the Jackpot <br /> Food Mart facilities in Lockeford and Manteca If you require more specific information relating to the <br /> use of the additive MTBE at these sites, please contact me and I will attempt to answer any additional <br /> questions that you may have <br /> As always, if you have any questions regarding this project, please feel free to phone me at (206) 286- <br /> 4495 <br /> Sincerely,;T ie Oil C9 <br /> G5*.4cI <br /> • Anastasia E Duarte-Wilkinson <br /> Environmental Toxicologist <br /> I <br /> cc Ms Elizabeth Thayer <br /> California Regional Water Quality Control Board <br /> janD&4167124 doc <br />