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The PID readings of free air concentrations dropped to 0 0 ppm with only a small number of spikes The fire department sprayed foam on the excavation a total of three times PRC personnel stopped the work, covered the excavation with visqueen, and secured the site Approximately 2,700 gallons of water mixed with fuel were then pumped from the tank and ' transported by Dillard Trucking, Inc to Gibson Oil and Refining Co , Inc of Bakersfield, California (Appendix A, Photo 3) The manifest and disposal documentation is presented in Appendix B The site was then secured and gated Barrier tape and caution cones were placed around the perimeter of the site The following day, Riedel Environmental covered the excavation with two 2-inch thick ' metal plates ' The field activities were reassessed by the Navy, San Joaquin County Public Health Services, Environmental Health Division, and PRC and a decision to conduct the work in Level C was reached ' on April 13, 1992 Work resumed on April 20, 1992 PID readings were 0 0 ppm when the metal plates were removed Early on the morning of April 20, 1992, it was discovered that the tank had again filled with liquid to a level of approximately 47 inches from the bottom of the tank The source of the additional amount of liquid is unknown ' Liquid was pumped out of the tank using a 2-inch hose Excavation activities commenced on the south side of the tank Precautions were taken not to disturb the adjacent tanks, especially during ' excavation of additional soils material on the south side of tank 81713-2 The tank was loosened from its cement pad by breaking the three, equally-spaced metal cable tie downs The metal cables were ' fastened to a concrete tank pad, which was not disturbed or destroyed According to Navy personnel the concrete pad continues under the adjacent tanks to the north The tank and associated pipes were ' rinsed with water and the rinsate removed from the tank with the vacuum truck (Appendix A, Photo 4) Approximately 2,280 gallons of rinsate and fuel mixture was manifested and transported off site ' by Dillard Trucking, Inc for disposal at Gibson Oil and Refining Co , Inc of Bakersfield, California Fluid hauling manifest and disposal documentation is presented in Appendix B ' One hundred fifty pounds of dr ice laced inside the tank to inert the tank Y were P and lower ' the explosive limit to acceptable levels prior to tank removal In addition to vapor displacement, the atmosphere inside the tank was verified with an explosimeter to be nonexplosive The tank was then removed from the excavation with the excavator, manifested, and hauled off site by Dillard Trucking, TANKRMU NEW 04401 QUPATRI 3114193 6