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1 <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 Tile tests utilized static <br /> ' pressure from an applied product head The tests conducted to 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, in conjunction with tank removal, detected high concentrations of petroleum <br /> product constituents in the samples from beneath Tank No 2 (Table 1) The constituents <br /> ' detected in the soil samples are typically derived from gasoline <br /> On August 13 & 14, 1990, RESNA (formerly WaterWork Corporation) drilled, logged, and <br /> sampled soil borings near the former UST location and installed a groundwater monitoring well <br /> ' in the approximate center of the former tank location (Figure 2) One soil boring (SBI) was <br /> dulled to 65 feet Three soil borings (SB2, SB3 & SB4) were drilled to 30 feet, and the fifth <br /> ' soil boring was drilled to 80 feet below grade and subsequently completed as a groundwater <br /> monitoring well (MW I) <br /> Laboratory analysis of the soils encountered in MWI, directly beneath the previous tank pit <br /> indicated high levels of gasoline hydrocarbons at depths between 10 and 20 feet The <br /> concentrations of gasoline hydrocarbons dropped off significantly with depth due to the low <br /> ' R 052992 LF 2 <br />