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Working To Restore Nature <br /> history of groundwater use in the Stockton area, however, has resulted in significant local <br /> variations in gradient Groundwater gradient direction at the site has ranged from northerly to <br /> ' northeasterly <br /> ' SITE BACKGROUNDIPREVIOUS 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 when removed Tank No 2 was a 1,000-gallon <br /> tank and was approximately 30 years old when removed Each tank had its own pump and <br /> independent piping systems The former underground storage tanks were located on the east <br /> side of, and immediately adjacent to, the mausoleum as shown on Figure 2 <br /> The tanks had been 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 /> 154041UMPORTMSR-0694 FNL 3 <br />