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' QuikStopnarkets, Inc. Page A-1
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<br /> APPENDIX A
<br /> SITE BACKGROUND
<br /> Quik Stop Markets 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: two
<br /> 10,000-gallon gasoline tanks,one containing regular leaded gasoline and one containing unleaded
<br />' gasoline, and two 8,000-gallon tanks, one containing diesel and the other premium unleaded
<br /> gasoline In 1987, RESNA Industries Inc. (RESNA), operating under our previous name,
<br /> Exceltech, Inc (Exceltech), installed a vadose monitoring system around the four tanks at the site,
<br /> which detected the presence of hydrocarbons Leaks were found in the fuel system and were
<br /> determined to be confined to the diesel fuel product lines The lines were then excavated and
<br />' repaired Exceltech removed the contaminated soil and backfill material. Examination of the
<br /> remaining soil and backfill indicated that the contamination had been removed The excavation was
<br /> backfilled, the system precision tested,passed the test, and put back into operation
<br /> In October 1990, RESNA completed a soil and groundwater investigation for the subject Quilt
<br /> Stop Market in Stockton, California This investigation has began as an emergency response when
<br /> in March 1990, the alarm of the leak detection system sounded. The investigation included drilling
<br /> three 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 analysts During the course of a leak detection test, not conducted by
<br /> Exceltech, it was found that product lines were leaking. The product Imes were repaired,
<br /> contaminated soil excavated and removed, and the excavation backfilled with clean fill (Exceltech,
<br /> October 9, 1990) The system was then precision tested, passed the test, and put back into
<br /> operation. In December 1990, a quarterly groundwater monitoring program was initiated
<br />' In April 1991, due to regulatory concerns about hydrocarbons found in groundwater during the
<br /> December 1990 sampling and analysis, an additional sampling and analysis was performed This
<br /> sampling and analysis confirmed the non-detectable results of the March 1991 sampling and
<br />' analysis In February 1992, after four consecutive quarters of non-detectable results, Quik Stop
<br /> Markets requested reduction of quarterly sampling and analysis to a semiannual schedule On
<br /> March 3, 1992,the San Joaquin County Public Health Services approved this request
<br /> Reference
<br /> Exceltech, Inc , October 1990, "Soil and Groundwater Investigation, Quilt Stop No 120,
<br /> Stockton, California, Project No. 3-49120-31," unpublished report for Quik Stop Market,
<br /> Inc , Fremont, California
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