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li 'E Harding Lawson Associates 3.0 SITE BACKGROUND HLA's summary of the site background is based on information provided in Levine-Fricke's (LF) report dated November 9, 1989, on the removal of one underground storage tank at the site. One 10,000-gallon underground storage tank, product line, and dispenser were removed from the site on September 18 through 21, 1989. The tank had been used most recently for diesel storage but had been used previously for gasoline storage. The tank location is presented on Plate 2. The tank was approximately 10 feet east of the loading dock area and about 100 feet north of the store building. The tank had been covered by approximately 3 feet of sand backfill and asphalt pavement. Ms. Kasey Foley, Environmental Health Specialist with the SJCDEH, and Mr. Rodney Ezell, from the Stockton Fire Department, were onsite to observe tank removal and soil excavation/sampling activities. Approximately .250 gallons of residual fluid were pumped from the tank into a vacuum truck and transported for disposal to H and H Ship Service Company (H&H) by California Oil Recyclers, Inc., of Newark, California. The tank was then rendered inert by inserting approximately 190 pounds of dry ice to purge gasoline vapors and oxygen. The tank was removed after explosivity meter readings in the tank, taken at least i hour after the dry ice was inserted, indicated that vapor concentrations were below 20 percent of the lower explosive limit. After the tank had been emptied and removed, it was visually inspected. The tank was constructed of steel with welded seams and appeared igood condition. No pp n evidence of Ieakage or holes was observed during the inspection. The tank and appurtenant piping were transported with a hazardous waste I manifest by H&H, a licensed hazardous waste transportation company, to their receiving i T19461-H 4 of 20