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Two main waterways run within 11h miles of the site, the San Joaquin River to the southeast and <br /> the Calaveras River to the north Both of these rivers are in hydrogeologic continuity with the <br /> ' local groundwater system <br /> ' SITE BACKGROUND/PREVIOUS WORK <br /> In November, 1989, two underground gasoline storage tanks were removed from the Cemetery <br /> grounds The tanks were used to fuel on-site maintenance vehicles and contained unleaded <br /> ' gasoline Both tanks had also contained leaded gasoline in the past Tank No 1 was a 500- <br /> gallon tank and was approximately 15 years old Tank No 2 was a 1,000-gallon tank and was <br /> approximately 30 years old Each tank had its own pump and independent piping systems The <br /> former underground storage tanks were located on the east side of, and immediately adjacent to <br /> ' the mausoleum as shown on Figure 2 <br /> ' The tanks were tested in January, 1987, and again in August, 1989 The tests utilized static <br /> pressure from an applied product head The tests conducted in 1989 indicated a leak <br /> Approximately one month after the August, 1989 test, a rapid loss of product from Tank No <br /> 2 was discovered during daily inventory measurement Nearly the entire contents of the tank <br /> ' (1,000 gallons) was lost, presumably to subsurface soils The tanks were taken out of service, <br /> and were removed on November 17, 1989 The tank removal, soil sampling, and disposal <br /> ' operations were conducted by Stockton Service Station Equipment Co , Inc Visual Inspection <br /> of the tanks indicated leakage due to corrosion A large hole, 4-5 inches in diameter, was <br /> ' observed in Tank No 2, along with numerous pinhole size openings in the tank bottom (verbal <br /> communication with Al Vigil) A representative of the San Joaquin County Public Health <br /> ' Services, Environmental Health Division, was present during the tank removal and soil sampling <br /> operations The tank disposal was contracted to Erickson, Inc , of Richmond, California, who <br /> ' transported the tanks under manifest for disposal <br /> ' Soil sampling detected high concentrations of petroleum product constituents in the samples from <br /> beneath Tank No 2 The constituents detected in the soil samples are typically derived from <br /> gasoline <br /> ' R 021492 LF 2 <br />