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Quilt Stop Markets, Inc September 10, 1992 Project No. F7120.32 Page 1 APPENDIX A SITE BACKGROUND Quik Stop Markets No. 120 9321 North Thornton Road Stockton, California Quik Stop Market No 120 currently utilizes four underground fuel storage tanks on-site two 10,000-gallon gasoline tanks,one containing regular leaded gasoline and one containing unleaded gasoline, and two 8,000-gallon tanks, one containing diesel and the other premium unleaded gasoline In 1987, RESNA Industries Inc (RESNA), operating under our previous name, ' Exceltech, Inc (Exceltech), installed a vadose monitonng system around the four tanks at the site, which detected the presence of hydrocarbons Leaks were found in the fuel system and were determined to be confined to the diesel fuel product lanes The lines were then excavated and ' repaired Exceltech removed the contaminated soil and backfill material and examination of the remaining soil and backfill indicated that the contamination had been removed The excavation was backfilled, the system precision tested, passed the test, and put back into operation ' In October 1990, RESNA completed a soil and groundwater investigation for the subject Quik Stop Market in Stockton, California This investigation was initially begun as an emergency response in March 1990, due to the station's leak detection system being in the alarm mode The invesnganon included drilling three exploratory borings, collecting soil samples at 5-foot depth intervals for identification and analysis, converting the borings to groundwater monitoring wells and collecting groundwater samples for laboratory analysis. During the course of a leak detection study, which was not conducted by Exceltech, it was found that product lines were leaking The product lines were repaired, contaminated soil excavated and removed, and the excavation backfilled with clean fill (Exceltech, October 9, 1990). The system was then precision tested, passed the test, and put back into operation In December 1990, a quarterly groundwater monitoring program was initiated. In April 1991, due to regulatory concerns about hydrocarbons found in groundwater during the December 1990 sampling and analysis, an additional sampling and analysis was performed. This ' sampling and analysis confirmed the non-detectable results of the March 1991 sampling and analysis In February 1992, after four consecutive quarters of non-detectable results, Quik Stop Markets requested reduction of quarterly sampling and analysis to a semiannual schedule On March 3, 1992,the San Joaquin County Public Health Services approved this request