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r KEI-P89-1104 .R1 January 8 , 1990 Page 2 FIELD ACTIVITIES KEI ' s field work was conducted on November 17 , 1989 , when three underground fuel storage tanks were removed from the site. The tanks consisted of one 10, 000 gallon super unleaded tank, one 10, 000 gallon regular unleaded fuel storage tank, and one 280 gallon waste oil tank. The tanks were made of steel and no apparent holes or cracks were observed in the tanks. Ms . Kasey Foley of San Joaquin County Public Health Services, and Mr. Ron Hiltscher of the City of Stockton Fire Department were present during tank removal . Ms. Kasey Foley was also present during subsequent soil sampling_ Four soil samples, labeled Al, A2 , B1 and B2 , were taken of native soil from beneath the fuel tanks at depths of 15. 5 to 16. 5 feet. One soil sample, labeled WO1, was collected from the native soil beneath the waste oil tank at a depth of 9. 5 feet. Samples were collected from bulk material excavated by backhoe. Samples were placed in clean, two-inch diameter brass tubes, sealed with aluminum foil, plastic caps and tape, and stored in a cooled ice chest for delivery to a certified laboratory. Sample locations are as shown on the attached Site Plan, Figure 1. KEI returned to the site on November 20, 1989 in order to collect samples of the native soil from the on-site pipe trenches. Four samples, labeled P1 through P4 , were collected from the product pipe trenches. Two samples, labeled VP1 and VP2 , were collected from the vapor pipe trenches, and one sample, labeled WP1, was collected from the waste oil remote fill pipe trench. All seven soil samples were collected from bulk material excavated by backhoe at depths ranging from 2. 5 to 3 . 5 feet. These samples were also collected in clean two-inch diameter brass tubes, handled as described above. Pipe trench sample point locations are as shown on the attached Site Plan, Figure 3 . In an attempt to remove as much of the contaminated soil as possible 1n the fuel tank pit, KEI returned to the site on December 5, 1989 to observe additional soil excavation in the area of sample points A2 and B2 as described in KEI Is work plan (KEI-P89-1104 . P1) dated November 22 , 1989 . Soil was excavated from the southerly half of the fuel tank pit to a depth of 26. 5 feet. The excavated soil was stockpiled for further sampling. Two soil samples, labeled A2 (25. 5) and B2 (26. 5) , were collected of native soil from the fuel tank pit below sample point location A2 at a depth of 25. 5 feet, and below sample point location B2 at a depth of 26. 5 feet, respectively. Four soil samples, labeled SW1 (13) , SW1 (19) , SW2 (20/13) and SW2 (20/19) , were also collected of native soil from the tank pit sidewalls at depths of 13 and 19