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Revised Work Plan for Additional Groundwater`Investigation <br /> Quik Stop Market No. 132 <br /> 3555 West Hammer lane <br /> `- Stockton,California <br /> On September 24, 1998, ATC visited Quik Stop No. 132 to reconnoiter the surrounding area in <br /> order to visually confirm the presence of any wells within 2,000 feet of Quik Stop No. 132. ATC <br /> was not able to locate any domestic, municipal, and agricultural wells within 2,000 feet of Quik <br /> Stop No. 132. However, ATC was able to locate four groundwater monitoring wells located at <br /> the downgradient Unocal Service Station (approximately 1,300 feet southeast of Quik Stop No. <br /> 132). <br /> OPERATING HISTORY OF SITE USTs <br /> The following is a brief summary of the site operational history: <br /> �. <br /> 1. Dillion Real Estate (a subsidiary of Dillion Companies, Quik Stop's parent) acquired the site <br /> from Woodland Development in May 1985. The site at that time was apparently <br /> `, undeveloped. <br /> 1 2. Quik Stop installed one 8,000-gallon and two 10,000-gallon Xerxes double-walled fiberglass <br /> USTs in October 1985. Product piping was single-walled fiberglass contained within a lined <br /> trench ("Fiber-trench"). <br /> I� 3. Quik Stop #132 opened for retail sales in December 1985. <br /> i 4. A vadose monitoring system was installed around the USTs in 1987. <br /> 5. In March 1989, Dillon Real Estate sold the property to Alice Adachi with a leaseback to Quik <br /> Stop Markets. Quik Stop remains the owner and operator of record for the gasoline <br /> tr equipment. <br /> 6. Gasoline vapor was detected in at least one of the vadose wells in July 1990. <br /> 7. Investigation suggested that piping or dispenser leaks had occurred around the north dispenser <br /> island, and the Fiber-Trench had failed to contain the release. <br /> 8. Further assessment ultimately resulted in the entire gasoline system being removed and all <br /> known contaminated soil being excavated in October-November 1990. <br /> f 9. New double-walled USTs and product lines, dispensers, and canopies were installed in March <br /> 1991. <br /> 10. Various phases of assessment and groundwater monitoring have been conducted since 1991. <br /> Details are presented in the reports listed in the reference section. <br /> i' <br /> rv. <br /> ......_.. Rra (Geopx)2.e 4 <br /> V <br />