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1 <br />' 10 INTRODUCTION <br /> This Site Closure Report (Closure Report) has been prepared for two <br />' former underground storage tank (UST) sites at the former Heinz USA <br /> (Heinz) facility at 757 Eleventh Street in Tracy, California (Figure 1) On <br /> behalf of Heinz, Environmental Resources Management (ERM) has <br />' discussed site closure with the San Joaquin County Public Health <br /> Services/Environmental Health Division (PHS/EHD) and the Central <br /> r Valley Regional Water Quality Control Board (RWQCB) This report <br /> summarizes the data required by PHS/EHD and the RWQCB for closure <br /> of the UST sites <br /> rUSTs were removed from two sites at the former Heinz facility in <br /> February 1998 (Figure 2 shows the former tank locations) At that time, <br /> rreleases of petroleum hydrocarbons from both of the USTs were detected <br /> Petroleum-impacted soil and ground water were subsequently removed <br /> r from the excavation at each former tank location A soil and ground water <br /> investigation, including the installation of monitoring wells, was <br /> conducted at each former tank site to determine the extent of petroleum <br /> impacts Ground water remediation activities were subsequently <br /> conducted to reduce the concentrations and extent of petroleum <br /> hydrocarbons in ground water downgradient of each site Ongoing <br /> rground water monitoring indicates that the residual levels of petroleum <br /> hydrocarbons at the two locations do not pose a threat to human health <br /> and that bioremediation will continue to reduce the concentrations <br /> rTherefore, no further action is necessary at either tank site to address the <br /> residual petroleum hydrocarbons and the sites can be closed <br /> r <br /> 11 DOCUMENT ORGANIZATION <br /> rThis Closure Report is divided into eight sections followed by tables, <br /> figures, and appendices, as follows <br /> ro Section 1 provides general site background information <br /> r • Sections 2 and 3 provide details of the tank removal, investigation,and <br /> remediation activities completed at former tank sites 1 and 2, <br /> respectively <br /> r • A discussion of the evaluation of remediation technologies and the <br /> rationale for selecting the best available technology is presented in <br /> Section 4 <br /> rERM HEINZ USA-3374 60-3/27/00 <br />