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_ FLUOR DANIEL GTI <br /> . —� Apri128, 1998 <br /> -�$ <br /> Ms. Carol Oz C-,:v <br /> pan Joaquin County Public Health Services <br /> P.O. Box 388,304 East Weber Avenue <br /> j Stockton, California 95201-388 k <br /> a <br /> Subject: Addendum To Workplan For Subsurface Investigation . <br /> Southland 7-Eleven Store#19976 <br /> 1399 North Main Street <br /> Manteca, California . <br /> Ms Oz: <br /> As requested, Fluor Daniel GTI, Inc.stipulates the following as an addendum to the Workplan For <br /> Subsurface Investigation,dated March 31; 1998 for the subject site: <br /> 1) The five proposed soil borings will be drilled to a depth of 25.feet below ground surface (BGS);however, <br /> if field instruments and/or visual observation indicate hydrocarbons are present in the sample collected at <br /> 25 feet BGS,the soil boring'will be extended vertically with samples collected at5-foot intervals until field <br /> instruments and visual observation indicate that the samples contain no hydrocarbons. <br /> 2)A discrete soil-sample will be collected from each boring at the capillary fringe. <br /> A 3) The soil boring located on the northeast side of the underground storage tank pit will be sampled <br /> continuously from surface grade to total depth of the boring. <br /> 4)All soil and groundwater samples will be additionally analyzed for gasoline oxygenates including tertiary <br /> butyl alcohol (TBA), methyl tent butyl ether(MTBE),di-isopropyl ether(DIPE),ethyl tertiary butyl ether <br /> (ETBE),tertiary amyl methyl ether(TAME) using EPA method 8260. <br /> 5) Fluor Daniel will conduct a search to identify all water supply wells within a 2,000-foot radius of the <br /> subject site. The well search will be conducted through the Department of Water Resources (DWR),the <br /> San Joaquin County Environmental Health Services Agency, and all local municipal water supply 1 <br /> companies. In addition, a door-to-door well search-will be conducted to locate other water supply wells <br /> which may not be on record. <br /> If there are any questions regarding this workplan addendum, please feel free to call me at our Martinez <br /> office at(510) 370-3990. <br /> Sincerely, <br /> Fluor Daniel GTI,Inc. i <br /> i David Bean <br /> { Staff Geologist <br /> ' 757 Arnold Drive, Suite D/ Martinez, CA 94553 USA (510) 370-3990 FAX(Si0) 370-399] <br /> E <br />