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SITE ASSESSMENT REPORT <br /> UNDERGROUND STORAGE TANK SITE <br /> TIME OIL CO <br /> JACKPOT FOOD MART/BP SERVICE STATION <br /> MANTECA, CALIFORNIA <br /> 1 O INTRODUCTION <br /> This report has been prepared for Time Oil Co (Time Oil) by Canonie Environmental <br /> Services Corp (Canonie) to summarize the results of the recent site assessment <br /> investigation performed at the Jackpot Food Mart/BP Service Station underground <br /> storage tank (UST) site (Site), located at 1434 West Yosemite Avenue in Manteca, <br /> California (Figure 1 ) The site activities were performed as described in the Canonie <br /> July 1992 Site Assessment Work Plan (Work Plan), which was submitted to the San <br /> Joaquin County Public Health Services, Environmental Health Division (County EHD) <br /> and the California Regional Water Quality Control Board - Central Valley Region <br /> (RWQCB) by Time Oil Co The Work Plan text is provided in Appendix A This report <br /> outlines the site assessment activities performed, presents the field data collected, <br /> 1 and provides the laboratory analytical results from the soil, ground water, and soil <br /> vapor sampling <br /> In September 1991, three USTs were removed from the site as part of a facility <br /> upgrade Laboratory analyses of samples collected during the UST removal activities <br /> (see Work Plan) indicated elevated concentrations of total petroleum hydrocarbons <br /> quantified as gasoline (TPH-G), benzene, toluene, ethylbenzene, and xylenes (BTEX), <br /> and ethylene dibromide (EDB) in the Site soils Based on these results, a site <br /> assessment was performed which included a soil gas survey of the site, drilling and <br /> sampling seven soil borings, converting four of the borings into ground water <br /> monitoring/extraction wells and three of the borings into soil vapor extraction wells, <br /> collecting ground water samples, and performing soil vapor extraction pilot testing <br /> The soil gas survey was performed to assist in determining the extent of soils <br /> 1 impacted by petroleum hydrocarbon-based volatile organic compounds (VOCs) prior <br /> to the placement of soil borings and monitoring/extraction wells The results of the <br /> PLOW 401 63CREPORTSMTE ASSWANTECAWANTECA RPT 1APr 26 931 Cance twEnvlronmental <br />