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W <br /> s <br /> k <br /> tt <br /> Quik Stop Market No. 132 <br /> Job No. 349132-32 October 30, 1940 <br /> Page 1 <br /> PHASE 3 <br /> WORK PLAN FOR SOIL AND GROUNDWATER <br /> INVESTIGATION <br /> AT <br /> QUIK STOP MARKET NO. 132 <br /> f 3555 W. HAMMER LANE <br /> STOCKTON, .CALIFORNIA <br /> Exceltech, Inc,, proposes the drilling and sampling of four exploratory borings and <br /> c-.%iverting them to groundwater monitoring wells at Quik Stop Market No. 132 at 3555 <br /> W. Hammer Lane, <br /> Stockton, California (,Figure 1). If these wells do not define the <br /> s extent of the groundwater contamination, Exceltech is prepared to proceed with <br /> i installing additional wells to define the limits of contamination. Quik Stop Markets has <br /> expressed to Exceltech its desire to begin words as soon as possible upon issuance of the <br /> proper permits. <br /> ; i <br /> SITE HISTORY <br /> x <br /> Quik Stop Market No. 132 formerly utilized three underground fuel-storage tanks on- <br /> site; two 10,000_gailon tanks contained regular unleaded and leaded gasoline and one <br /> 8.000-gallon tank contained super unleaded gasoline. In 1987, Exceltech installed a <br /> # j vadose monitoring system around .the tanks at the site, This s stem detected <br /> hydrocarbon contamination in July 1990. Gasoline contaminated fill was found in the <br /> p EG4 <br /> lined trenches; containing the product lines. The contaminated backfill has been <br /> j removed from the trenches. Soil samples were collected and analyzed for gasoline <br /> comDonents.' The results of the analysis revealed that hydrocarbons have <br /> sail adjacent to the east half of the product line trench which serves thpenetrated <br /> no nth purrtae <br /> island. <br /> ?^; Exceltech drilled four exploratory borings and converted one of them to a groundwater <br /> i s monitoring well on August 23,; 1990. The results of soil analysis of the soil samples <br /> from three borings showed little or no petroleum hydrocarbon contamination. One <br /> boring near the northwest portion of the north pump island, contained 460 parts per <br /> million (ppm) total petroleum hydrocarbons as gasoline (TPHG . The groundwater <br /> from monitoring well MW-1 contained 470 arts ) g. dwppbr <br /> p per billion (ppb) TPHG and 21 ppb <br /> . <br /> ben benzene as well as detectable-levels of toluene;ethyl benzene,and total xylenes. <br /> Or., September.14 12, and 13, 1990, Exceltech drilled five exploratory borings and <br /> converted three of thein to groundwater monitoring wells, monitoring groundwater <br /> located in a "lower" sandy unit. The results of soil analysis of the soil samples from <br /> these borings showed little or no petroleum hydrocarbon contamination. 'Analysis of <br /> t.- <br />