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4� 11M. Mg, I3 :f. twit E , <br /> S <br /> Quik Stop Market No. 120 January 17, 1991 <br /> Project No. 3-49120-31 Page I <br /> DECEMBER QUARTERLY <br /> GROUNDWATER SAMPLING AND ANALYSIS <br /> FOR <br /> QUIK STOP MARKETS <br /> QUIK STOP NO. 120 <br /> 9321 NORTH THORNTON ROAD <br /> STOCKTON, CALIFORNIA <br /> Introduction <br /> Exceltech, Inc., has completed the December 1990 quarterly sampling and analysis to <br /> ascertain groundwater conditions beneath Quik Stop Market No. 120 located in the City of <br /> Stockton, San Joaquin County, California (Figures I and 2). Exceltech sampled the <br /> groundwater at the site on December 6, 1990. The quarterly sampling program is required <br /> by the California Regional Water Quality Control Board and San Joaquin County Public <br /> Health Services,Environmental Health Division. The program objectives are listed below: <br /> • Measure the thickness of any observed floating product. <br /> • Measure depth to groundwater. <br /> • Plot the groundwater contour surface, as appropriate, within the site <br /> boundaries. <br /> • Sample and analyze groundwater. <br /> The existence and degree of hydrocarbon contamination is determined by(1)checking for <br /> the presence of free-floating petroleum product and(2)performing laboratory analyses on <br /> groundwater samples to determine the presence of total petroleum hydrocarbons as diesel <br /> r (TPHD), total petroleum hydrocarbons as gasoline(TPHG), and benzene, toluene, ethyl <br /> benzene, and total xylenes(BTEX). This report summarizes the sampling procedures and <br /> monitoring results for the quarter ending December 1990. It also contains a summary of all <br /> y— analytical results from previous samplings. This is the first quarterly sampling report for <br /> this site. <br /> .r Background <br /> In October 1990,Exceltech completed a soil and groundwater investigation for the subject <br /> ^' Quik Stop Market in Stockton, California. This investigation was initially begun as an <br /> w� emergency response in March 1990,due to the station's teak ur-.tection sys!em being in the <br />