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I <br /> 1 <br /> Union Safe Deposit Workplan <br /> 1.0 INTRODUCTION <br /> Augeas Corporation has prepared a workplan for an exploratory drilling and <br /> sampling episode at the subject property described below. The following i <br /> proposal summarizes the details of our workplan. <br /> 2.0 PROTECT HISTORY <br /> The property subject is situated at 7810 Thornton Road in the Stockton, <br /> J p <br /> California. The subject property is situated in a predominantly commercial <br /> area.The site,formerly Ron's Chevron,underwent demolition and reconstruction <br /> in 1983. The existing bank structure was erected soon after. <br /> Augeas Corporation was retained by Leslie Trotter of Union Safe Deposit to <br /> perform an Environmental Site Assessment (ESA) for the subject property in <br /> C May of 1992. Augeas Corporation's investigation revealed the following <br /> information: review of the Stockton Fire Dept. files indicates indicates four <br /> underground storage tanks were in use as of Aril of 1958. No documentation <br /> of the closure and/or removal of these tanks was found. Agency files also <br /> indicated that four different-underground_storage-tanks-were-removed_in May <br /> <0f-1983::This removal occurred prior to implementation of soil sampling <br /> requirements following tank removal. Therefore, no documentation as to the <br /> condition of the tanks or surrounding soils exist. <br /> In addition, contamination may have been carried to the site through local <br /> groundwater migration. Possible sources of contaminants include: the B.P <br /> Station to the southeast,the Tune-Up Shop and Service Center to the east and <br /> the Knowles Gas Station located to the northeast. According to groundwater <br /> documentation reviewed by Augeas,these sites may all be periodically located <br /> upgradient of the subject property. <br /> Project Number: UNS622 Page 2 of 8 <br />