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i <br /> 1.0 INTRODUCTION <br /> IScience & Engineering Analysis Corporation (SEACOR®) has prepared this Problem Assessment <br /> Report to present the findings of the environmental investigation conducted at the Jackpot Food Mart <br /> at 1434 West Yosemite Avenue in Manteca, California (Figure 1) This report has been prepared <br /> at the request of Time Oil Company, the property owner The objective of this investigation was to <br /> evaluate if the groundwater beneath the site has been impacted with petroleum hydrocarbons, to <br /> define the lateral extent of soil impacted by petroleum hydrocarbons, and evaluate remediation <br /> alternatives for the soil This report was written to comply with the guidelines set forth by the <br /> ICalifornia Regional Water Quality Control Board (CRWQCB) regarding consultants' reports for <br /> environmental assessments <br /> 2.0 BACKGROUND <br /> I <br /> The facility at the site has been operating as gasoline station since 1969 In September 1991, the <br /> underground storage tanks (USTs) and associated piping were removed from the site as part of a <br /> Ifacility upgrade Laboratory analytical results of soil samples collected during the tank removal <br /> activities reported detectable concentrations of total petroleum hydrocarbons as gasoline (TPHg), <br /> Ibenzene, toluene, ethylbenzene, and xylenes (BTEX), and ethylene dibromide (EDB) Based on <br /> these results, an assessment was conducted at the site in August 1992 which included a soil gas <br /> survey, drilling and soil sampling of seven soil borings, and converting four of the borings into <br /> groundwater monitor/extraction wells and three of the borings into soil vapor extraction wells A <br /> soil vapor extraction pilot test was subsequently performed on the vapor extraction wells A copy <br /> of the tank pull report prepared by Canonie Environmental (Canome) was forwarded to the office <br /> of San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) on <br /> December 17, 1991 A copy of the site assessment report prepared by Canome was forwarded on <br /> IMay 26, 1993 Based on the PHS/EHD's June 24, 1993 reply, an additional investigation was <br /> implemented by SEACOR in December 1993 Site activities included the advancement of four <br /> I <br /> TOC 1434 PAR sFACOA• <br /> NoOOS-002-01 y May]l 1941 <br /> I <br />