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1 0 INTRODUCTION <br /> SECO <br /> R International Incorporated (SECOR) has prepared this document to present the results of <br /> quarterly groundwater monitoring and sampling and propose additional assessment activities at the <br /> Jackpot Food Mart at 14000 East highway 88 in Lockeford, California (Figure 1) This report and <br /> work plan has been prepared at the request of Time Oil Company, the property owner Groundwater <br /> monitoring and sampling were conducted to determine water table elevation, the thickness of any <br /> separate-phase petroleum hydrocarbons, and the distribution of dissolved hydrocarbons in the four <br /> monitor wells at this site <br /> The objective of the proposed investigation is to define the vertical and lateral extent of soil and <br /> groundwater impacted by petroleum hydrocarbons The proposed investigation involves the drilling <br /> of six soil borings, converting the soil borings to groundwater monitor wells, the collection and <br /> chemical analysis of soil and groundwater samples, and the preparation of a technical report detailing <br /> the findings of the investigation All work will be conducted under the direction of a California <br /> registered geologist <br /> 2 0 BACKGROUND <br /> The site is located on East Highway 88 on the east side of the community of Lockeford in San Joaquin <br /> County, California at an elevation of approximately 100 feet above mean sea level The site is currently <br /> an operating Jackpot Food MawExxon gas station The former and current site features are shown <br /> on the Site Plan (Figure 2) A generalized geologic cross section / fence diagram depicting the <br /> interpreted lithologic features is shown on Figure 3 <br /> In September 1991, three tanks were removed from the site by Scott Company as part of a facility <br /> upgrade In addition, the pump islands and dispensers were removed and replaced After removal <br /> of the USTs and the pump islands, soil samples were collected from the tank and pump island <br /> excavations The highest levels of petroleum hydrocarbons were found in the soil samples collected <br /> from beneath the 6,000 gallon and the 8,000 gallon USTs at 8,900 parts per million (ppm) and 6,700 <br />' y193L0M QpL 1 eF.Cux <br /> Nf0003-091-01 �y <br /> 919% <br />