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id <br /> March 28, 1991 <br /> Quik Stop Market No. 120 Page I <br /> Project No. 3-49120-31 <br /> MARCH 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 /> Cxceltech; Inc., has completed the March 1991 quarterly sampling and analysis to <br /> ascertain groundwater conditions beneath Quik Stop Market2�. E 0 located <br /> in the <br /> the <br /> of Stockton, San Joaquin County, California (Fig �ram is required <br /> groundwater at the site on March 5, I991. The quarterly sampling pron <br /> by the California Regional Water Quality <br /> Division.ol The proard ogram <br /> gram obje tives are San Joaquin County Public <br /> Health Services, Environmental Health <br /> 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 o:hydrocarbon contamination is determined by (1) checking <br /> for the presence of free-floating petroleum product and (2) performing laboratory <br /> analyses on groundwater samples to determine the presence of total petroleum <br /> hydrocarbons as diesel (TPHD), total petroleum hydrocarbons as gasoline (TPHG), and <br /> l benzene, and total xylenes (BTEX). This report summarizes the <br /> benzene, toluene, ethyl <br /> sampling procedures and monitoring results for the quarter ending March 1991. It also <br /> contains a summary of all analytical results from previous samplings. This is the first <br /> quarterly sampling report for this site. <br /> Background <br /> In October 1990, Exceltech completed a soil and groundwater investigation for the <br /> sul;ect Quik Stop Market in Ste; o ,199U° ion was initially begun <br /> due to�the his lstation's tleak detection system <br /> as ar. emergency response in March <br />