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Working to Restore Nature <br /> June 1993 Semiannual Groundwater Sampling & Analysis August 13, 1993 <br /> Quik Stop Market No 120, Stockton, California F7120 93 <br /> APPENDIX A <br />' SITE BACKGROUND <br /> Quik Stop Market No 120 <br /> 9321 North Thornton Road <br />' Stockton, California <br /> Quik Stop Market No 120 currently utilizes four underground fuel storage tanks on-site <br /> two 10,000-gallon gasoline tanks, one formerly containing regular leaded gasoline and one <br />' containing unleaded gasoline, and two 8,000-gallon tanks, one containing diesel and the <br /> other premium unleaded gasoline In 1987, RESNA Industries Inc (RESNA), operating <br /> under our previous name, Exceltech, Inc (Exceltech), installed a vadose monitoring system <br />' around the four tanks at the site This system detected the presence of hydrocarbons <br /> Leaks were found in the fuel system and were determined to be confined to the diesel fuel <br /> product lines The lines were then excavated and repaired Exceltech removed the <br />' contaminated soil and backfill material Visual examination of the remaining soil and <br /> backfill indicated that the contamination had been removed The excavation was backfilled, <br /> the system successfully precision tested, and put back into operation <br /> tIn October 1990, RESNA completed a soil and groundwater investigation for the subject <br /> site This investigation was started as an emergency response in March 1990, when the <br /> alarm of the leak detection system sounded The investigation included drilling three <br /> exploratory borings, collecting soil samples at 5-foot depth intervals for identification and <br /> analysis, converting the borings to groundwater monitoring wells and collecting groundwater <br /> samples for laboratory analysis During the course of a leak detection test, not conducted <br />' by Exceltech, it was found that product lines were leaking The product lines were repaired, <br /> contaminated soil excavated and removed, and the excavation backfilled with clean fill <br /> (Exceltech, October 9, 1990) The system was then successfully precision tested and put <br />' back into operation In December 1990, a quarterly groundwater monitoring program was <br /> initiated <br />' In April 1991, due to regulatory concerns about hydrocarbons found in groundwater during <br /> the December 1990 sampling and analysis, an additional sampling and analysis was <br /> performed This sampling and analysis confirmed the non-detectable results of the March <br /> 1991 sampling and analysis. In February 1992, after four consecutive quarters of non- <br /> detectable results, Quik Stop Markets requested reduction of quarterly sampling and analysis <br /> to a semiannual schedule On March 3,1992, the San Joaquin County Public Health <br /> Services (SJCPHS) approved this request (SJCPHS, March 3, 1992) <br /> A-1 <br />