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u�k <br /> Q Stop Market No 120 February 10, 1992 <br /> Project No. 3-49120-31 Page 1 <br /> DECEMBER 1991 QUARTERLY <br /> GROUNDWATER SAMPLING AND ANALYSIS <br /> FOR <br /> QUIK STOP MARKET NO. 120 <br /> 9321 NORTH THORNTON ROAD <br /> STOCKTON, CALIFORNIA <br /> Introduction <br /> RESNA Industries Inc., (formerly Exceltech, Inc.) has completed the December 1991 <br /> quarterly sampling and analysis to ascertain groundwater conditions beneath Quik Stop <br /> Market No. 120 located 1n the City of Stockton, San Joaquin County, California <br />' (Figures 1 and 2). RESNA sampled the groundwater at the site on December 18, 1991. <br /> The quarterly sampling program is required by the California Regional Water Quality <br />' Control Board and San Joaquin County Public Health Services, Environmental Health <br /> 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 <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 /> benzene, toluene, ethyl benzene, and total xylenes (BTEX) This report summarizes the <br />' sampling procedures and monitoring results for the quarter ending December 1991. It <br /> also contains a summary of all analytical results from previous samplings <br />' Background <br /> In October 1990, RESNA completed a soil and groundwater investigation for the <br /> subject Quik Stop Market in Stockton, California. This investigation was initially begun <br /> as an emergency response in March 1990, due to the station's leak detection system <br /> being in the alarm mode. The scope of the work included drilling three exploratory <br /> borings, collecting soil samples at 5-foot depth intervals for identification and analysis, <br /> M <br />