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with UST removal and testing of remaining tanks and identifies deviations from the Tank Closure <br /> Plan, dated January 30, 1992 Section 4 0 presents the soil sampling and tank testing results, and <br /> Section 5 0 presents the conclusions and recommendations based on the field work and analytical <br /> ' results for all three tanks <br /> 2.0 SITE DESCRIPTION <br /> Prior to removal, tank 817B-2 was located on the west side of, and perpendicular to, Building <br /> 817-B, south of Davis Avenue at NAVCOMMSTA Stockton, Stockton, California (Figure 2) The <br /> ' UST was a 4,000-gallon steel tank reportedly used to store leaded gasoline for vehicles and equipment <br /> at NAVCOMMSTA Stockton The UST was installed in approximately 1945 and was no longer in <br /> use at the time of removal The depth to the tank was 43 inches below existing grade, and the tank <br /> measured 25 feet in length by 5 feet in diameter <br /> Two additional tanks, 81713-1 and 817B-3, are located approximately 6 feet and 14 feet, <br /> respectively, north of the historic location of tank 817E-2 These tanks are suspected to be similar in <br /> size and Navy personnel stated the tanks are used to store unleaded gasoline These USTs have not <br /> been observed in place, but evidence such as fill pipes and vapor recovery outlets were observed to be <br /> present These tanks share common product delivery piping and vapor recovery systems, as stated by <br /> on-site Navy personnel <br /> 3.0 FIELD ACTIVITIES <br /> Field activities, which occurred between April 2 and May 18, 1992, included the following <br /> tasks <br /> ' • Removal of tank 817B-2 and sampling of excavation sidewaIls and product <br /> delivery piping trench <br /> • Backfilling of excavation <br /> • Integrity testing of tanks 817B-1 and 817B-3 <br />' 1 <br /> TANKRMU NEW <br /> ' 0"162UPATRI 5114M 3 <br />