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A KEI-P89-1104 .R7 December 10, 1990 Page 2 KEI ' s initial 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 (SJCPHS) , 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 from beneath the fuel tanks at depths of 15. 5 to 16 . 5 feet. one soil sample, labeled Wo1, was collected from the soil beneath the waste oil tank at a depth of 9 .5 feet. Sample locations are as shown on the attached Site Plan, Figure 2 . KEI returned to the site on November 20, 1989 in order to collect soil samples 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 at depths ranging from 2 . 5 to 3 . 5 feet. Pipe trench sample point locations are as shown on the attached Site Plan, Figure 4 . In an attempt to remove as much of the contaminated soil as possible in 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 's 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. Two soil samples, labeled A2 (25.5) and B2 (26.5) , were collected 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 from the tank pit sidewalls at depths of 13 and 19 feet. Sample point locations are shown on the attached Site Plan, Figure 3 . Mr. Harlin Knoll of the SJCPHS was present during sampling. KEI again returned on December 7, 1989 in order to complete sampling of the southerly half of the fuel tank pit. Two soil samples, labeled SW3 (20/13) and SW3 (20/19) , were collected from the tank pit sidewalls at depths of 13 and 19 feet, respectively. In addition, one soil sample, labeled NSW, was collected from the northerly sidewall of the new fuel tank pit at a depth of 13 . 5 feet. Sample point locations are as shown on the attached Site Plan, Figure 3. On December 131 1989, KEI completed sampling of