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July 17, 1991 <br /> Quik Stop Market No. 120 Page I <br /> Project No. 3-49120-31 <br /> JUNE 1991 QUARTERLY <br /> GROUNDWATER SAMPLING AND ANALYS��,;+llh{)PdFr'. <br /> FOR <br /> QUIK S'L'OP MARKETS <br /> QUIK STOP NO. 120 <br /> 9321 NORTH 'rHORNTON ROAD <br /> STOCKTON, CALIFORNIA <br /> Introduction <br /> Exceltech, Inc., has completed . ie June 1991 quarterly sampling and analysis to <br /> ascertain groundwater conditions beneath Quik Stop Market No. 120 located in the City <br /> of Stockton, San Joaquin County, California (Figures 1 and 2). Exceltech sampled the <br /> groundwater at the site on June S, 1991. The quarterly sampling program is required <br /> by the California Regional Water Quality Control Board and 'San a in Coare Pubted <br /> lic <br /> Health Services, Environmet,te! Health Division. Thep g objectives <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 of hydrocarbon contamination is determined by (1 laboratory <br /> checking <br /> for the presence of free-floating petroleum product and (2) performing <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 /> ' <br /> benzene, toluene, ethyl benzene, and total xylenes (BTEX; r his report su1991 rt Itsa so ill <br /> sampling procedures and monitoring results for the quarter g <br /> Junecontains a summary of all analytical results from previous samplings. <br /> Background <br /> In October 1990, Exceltech completed a soil and groundwater investigation for the <br /> subject Quik Stop Market in Stockton, California. This investigation was initially begun <br /> , due to the station's leak detection system <br /> bn in he alarmency esponse in mode, Thos rch opelof t)he work included drilling three exploratory <br /> bung m <br />