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r. . <br /> 'w <br /> Quik Stop Market Pdo. 132 September 19, 1990 <br /> Project No. 349132-31 <br /> Page 1 <br /> PRELIMINARY SOIL AND <br /> GROUNDWATER INVESTIGATION <br /> AT <br /> J <br /> QUIK STOP MARKET NO. 132 <br /> 3555 W. HAMMER LANE <br /> STOCKTON, CALIFORNIA a <br /> e <br /> Presented below ars the results of the soil and groundwater investigation conduct <br /> ed by <br /> Exceltech, Inc. for Quik Stop Markets. The Quik Stop is located 3555 W. Hammer <br /> Lane,Stockton,California(Figure 1). <br /> F: <br /> y BACKGROUND <br /> Quik Stop Market No. 132 currently utilizes three underground fuel-storage tanks on-site; <br /> fG� two 10,000-gallon tanks contain regular unleaded and leaded gasoline and one 8,000-gallon <br /> tank contains super unleaded gasoline. In 1987,Exceltech installed a vadose monitoring <br /> system around the tanks at the site. This system detected hydrocarbon contamination in <br /> .iuly 1990. Gasoline contaminated fill was found in the lined trenches containing the <br /> : product lines. The contaminated backfill has <br /> samples were collected an been removed from the trenches. Soil fl <br /> d analyzed for gasoline components. The results of the analysis <br /> revealed that hydrocarbons have penetrated the soil adjacent to the east half of the product <br /> line trench which serves the north pump island. <br /> r SCOPE OF WORK <br /> cThe purpose of the investigation was to preliminarily evaluate the extent of hydrocarbon <br /> oncentration on the site by assessing subsurface soil and groundwater conditions. <br /> 1 .<xceltech accomplished the following: <br /> 4 S e Explored subsurface soil conditions by.drilling, logging, and sampling nine <br /> exploratory borings. <br /> •_- -Obtained soil sarnples'which were analyzed for the presence of total petroleum <br /> - - <br /> hydrocarbon as gasoline(TPHG); benzene, toluene,ethyl benzene,and xylenes <br /> f (BTEX);and total lead. <br /> x <br /> • Installed groundwater rncnitoring wells in four boreholes. <br /> Developed and sampled the groundwater monitoring wells and analyzed for <br /> .� <br /> TPHGBTEX. <br /> s <br />