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Blockbuster Vdeo/Yellow Submarine November 24, 1992 Monitoring Well Installation Page 2 I' The former-fuel tank cluster had only one sample taken and the waste oil tank area had a high value for oil in that sample. The full report is on file with the San Joaquin County Environmental Health Department. In January 1991, WHF submitted a plan for e-excavation of the site to the San Joaquin County Environmental Health Department. At that time, the presence of the waste oil tank on the site was unknown. The County rejected the proposed oversight of the re- excavation at this site. WHF had proposed to rd-excavate the former fuel tank and waste oil tank areas, as well as the former fuel island areas. 1 Due to the lack of County oversight, WHF proposed to the client to take numerous soil samples showing zero lines for any contamination found including product line routes, if they could be found. We anticipated finding small amounts of contamination, and hoped to remediate on site, any contaminated soils. On February Y6 1991 WHF began re-excavating the site with a backhoe. We found ' that the former fuel tank area was free of soils contamination. The product lines to the fuel islands had not been removed, and one of those lines still had approximately ten gallons of fuel in it. The fuel was drummed on site and the product lines were disposed of by Oscar Ericson as a hazardous material. The fuel island areas were either "none detected", or had small .pockets of contamination, which were excavated and stockpiled on site. A previously unknown fuel island was discovered in the northwest corner of the property. This area had contamination in a band about four feet wide and three feet thick near the surface. The band narrowed and went to the north as it went down. All of the contaminated soils to a.depth of 22 feet were removed and stockpiled on site. Excavation was stopped at 22 feet as the backhoe could not go deeper without terracing the excavation and adding significant costs to the re-excavation. As stated previously, it was discovered that the waste oil tank was still in place. The County Health Department was notified and permits were obtained to remove the tank with oversight from the County. Back taxes on the tank were paid at that time. Analytical results at the time of removal showed 10,000 ppm of motor oil at twelve feet below the surface and two feet below the tank. It was decided, since the excavator was on site, to continue investigation near the fuel island, that we would re--excavate the waste oil tank area to a depth of 15 feet and take another sample. This was done with the results showing a level of 3400 ppm of oil at 15 feet. In January of 1992, the building was demolished by Locke Construction Company of Lockeford, California. At the same time the waste oil fill line was removed and disposed of by PRC Refineries Service of Patterson, California. 1