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{! i <br />- I <br /> i. <br /> Executive Summary <br /> i <br /> This report presents the results and conclusions of a remedial investigation and feasibility <br /> I ' study completed for a former underground storage tank location at Del Monte's Plant 33 <br /> in Stockton, California. The purpose of this study was to evaluate the nature and extent of <br /> petroleum hydrocarbons in soil and groundwater on the property and develop a <br /> recommended remedial action plan. <br /> Del Monte PIant 33 is located in Stockton at the intersection of Myrtle Street and'Filbert <br /> Street and is operated primarily as a fruit canning facility. An underground storage tank <br /> UST site, known as the Disco site after a former gasoline station was located on the <br /> (UST) <br /> property. Three gasoline tanks were removed in 1985, and soil was excavated to a depth <br /> of seven feet below the tanks. A more detailed description of the site background and <br /> geology is presented in Section 1 of this report. <br /> t .l <br /> As discussed in Section 2 of this report, the site investigation included four major activities: <br /> • Soil-gas sampling at seventeen locations in the vicinity of the former gasoline <br /> tanks and gasoline dispensing islands <br /> • Drilling and sampling from a total of seven soil borings near the former Disco <br /> tanks <br /> • Drilling, developing, and sampling groundwater from a total of eight <br /> monitoring wells to evaluate the potential presence of petroleum hydrocarbons <br /> in groundwater <br /> I. • Performing a survey to locate known water production wells within 1 mile of <br /> the property <br /> .j The findings of the investigation are presented in Section 3 of this report. <br /> I1 <br /> A Geology y and Hydrology <br /> gy <br /> The local geology consists of alluvial soil deposits. Unsaturated zone soils include a <br /> relatively homo eneous region of sands, silty sands, fine silty sands, and silty clays with no <br /> clay layers observed. <br /> Saturated conditions exist at approximately 75 feet below ground surface (bgs) within fine <br /> sandy silts, clayey silts and sand. Groundwater in this zone flows generally northwesterly <br /> toward onsite production wells. The lateral hydralic gradient varies with the local demands, <br /> becoming greatest during the canning season in July through September. <br /> I1� <br />