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i • dated January 30, 1992. Section 4.0 presents the soil sampling and tank testing results, and Section 5.0 presents the conclusions and recommendations based on the field work and analytical results for all three tanks. 2.0 SITE DESCRIPTION Prior to removal, tank 81713-2 was located on the west side of, and perpendicular to, Building 817-13, south of Davis Avenue at NCS Stockton, Stockton, California (Figure 2). The UST was a 4,000 -gallon steel tank reportedly used to store leaded gasoline for vehicles and equipment at NCS Stockton. The UST was installed in approximately 1945 and was no longer in use at the time of removal. The depth to the tank was 43 inches below existing grade, and the tank measured 25 feet in length by 5 feet in diameter. Two additional tanks, 81713-1 and 817B-3, are located approximately 6 feet and 14 feet, respectively, north of the historic location of tank 81713-2. These tanks are suspected to be similar in size and Navy personnel stated the tanks are used to store unleaded gasoline. These USTs have not been observed in place, but evidence such as fill pipes and vapor recovery outlets were observed to be present. These tanks share common product delivery piping and vapor recovery systems, as stated by on-site Navy personnel. tasks: 3.0 FIELD ACTIVITIES Field activities, which occurred between April 2 and May 18, 1992, included the following • Removal of tank 81713-2 and sampling of excavation sidewalls and product delivery piping trench • Backfilling of excavation , ?`IGGrto(' Integrity testing $-3 r%v- Ivli Field activities were performed in accordance with the Tank Closure Plan for NCS Stockton dated January 30, 1992, which was approved by the Navy and the San Joaquin County, Public Health 3