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u <br /> Quik Stop Markets,Inc. February 11, 1992 <br /> Project No. 3-49132-32 Page I <br /> DECEMBER 1991 QUARTERLY <br /> GROUNDWATER SAMPLING AND ANALYSIS <br /> FOR <br /> i <br /> QUIK STOP MARKETS, INC. <br /> ! QUIK STOP MARKET NO. 132 <br /> 3555 W. DAMMER LANE <br /> STOCKTON, CALIFORNIA <br /> j < <br /> Introduction <br /> RESNA Industries, Inc. (formerly Exceltech, Inc.) has completed the December 1991 <br /> sampling program to ascertain the groundwater conditions beneath Quik Stop Market <br /> No. 132,located at 3555 W. Hammer Lane in the City of Stockton, San Joaquin County, <br /> California (see Figures 1 and 2). The monitoring wells are sampled quarterly to <br /> monitor the shallow groundwater underlying the site. The program objectives are <br /> listed below: <br /> • Measure depth of groundwater. <br /> Plot groundwater contour surface within the site boundaries. <br /> • Sample and analyze groundwater samples. <br /> • Compare current and past data. <br /> The existence and degree of petroleum hydrocarbons in the groundwater underlying the <br /> site is determined by (1) the presence of free-floating product; and, (2) laboratory <br /> analyses of groundwater samples to determine concentrations of total petroleum <br /> hydrocarbons as gasoline (TPHG), as well as benzene, toluene, ethyl benzene, and total <br /> xylenes (13TEX). <br /> Background <br /> Quik Stop Market No. 132 formerly utilized three underground fuel-storage tanks on- <br /> site; two 10,000-gallon tanks contained regular unleaded and leaded gasoline and one <br /> 8,000-gallon tank contained super unleaded gasoline. In 1987 Exceltech (RESNA) <br /> installed a vadose monitoring system around the tanks at the site. This system detected <br /> hydrocarbon contamination in July 1990. Gasoline-contaminated backfill was removed <br /> from the product line trenches and samples of the native soil at the bottoms of the <br /> trenches were collected and analyzed for gasoline components. The results of the <br /> analysis revealed that hydrocarbons penetrated the soil adjacent to the east half of the <br /> product Iine trench which serves the north pump island. <br /> ExceItech (RESNA) drilled four exploratory borings on the site at this time and <br /> converted one boring to a groundwater monitoring well on August 23, 1990. The <br /> w results of laboratory ana)yses of soil samples from three borings showed little or no <br />