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1.0 INTRODUCTION Hoblitzell & Associates, under contract to Mr. Heng Chea, owner of Waterloo Liquors, retained f Upgradient Environmental Consultants to witness the removal of three underground storage tanks from the Waterloo Liquors property, collect soil samples for laboratory analysis, and prepare a report summarizing the tank removal and laboratory results. This report completes the scope of work authorized under Upgradient proposal no. 97030. The site is under the regulatory oversight of San Joaquin County Environmental Health Division. 2.0 SITE LOCATION AND DESCRIPTION Waterloo Liquors is located at the intersection of Waterloo Road and Filbert Street in Stockton, California (Figure 1). It is operated by Mr. Heng Chea as a convenience store and gasoline station, and sells unleaded gasoline from a single dispenser island located at the front of the property. The gasoline has been stored in three 12,000-gallon underground tanks that were located between the dispenser island and the convenience store, and were partly covered by the dispenser island. The location of the tanks and other features is shown in Figure 2. The area along Waterloo Road is zoned for commercial uses. Topography in the area is flat. 3.0 TANK REMOVAL The tank removal took place on lune I0, 1998. Soil from around the tanks was removed by an excavator and stockpiled adjacent to the tank cavity. At approximately 8:30 a. m. the tanks were certified safe for removal by the Stockton Fire Department, and the tanks lifted from the excavation by the crane operator. After removal,each tank was set on the ground,cleaned, and inspected for leaks and then placed on a flat-bed truck for trasnport to a disposal facility. The first tank to be removed was the the eastern- most tank (tank #3). No holes were found, and the tank was only slightly rusted and pitted. The second tank was moderately rusted, but exhibited no holes. The third tank(tank#1)was both rusted and stained with petroleum, which appeared to be located primarily near the fill port, suggesting that accidental overspill may have occurred.No holes or leaks were observed. ! 4.0 COLLECTION AND ANALYSIS OF SOIL SAMPLES After the tanks were removed, the excavator was used to remove between two and four feet of soil E from beneath each tank. Upgradient then collected three samples from the excavator bucket, one at ! each end and one in the middle of each tank. The samples were collected with a percussion slide hammer loaded with 2 x 3-inch brass sample sleeves. The approximate locations of the samples are shown in Figure 2.In general,the samples were collected at a depth of approximately l6 feet 1 I