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asphalt/concrete and soil above the tank. Approximately 200 &of tank overburden soil was <br /> PP Y Y <br /> removed and stockpiled on visqueen into one pile. The asphalt/concrete rubble was stored <br /> separately. <br /> Immediately prior to tank removal on August 6, 1997,the tank was inerted with dry ice <br /> (approximately 150 lbs). Atmospheric readings were measured inside the tank under the <br /> direction of Fire Inspector Kent Miller, and SJCEHD Inspector Michael Kith. The oxygen <br /> concentration and lower explosion limit (LEL) for the diesel tank were measured to be: 5% and <br /> 0% respectively. Permission to remove the tank was granted by Mr. Miller and Mr. Kith. <br /> Upon removal, the tank appeared sound; no petroleum odors or stained soils were encountered in <br /> the excavation. No groundwater was encountered to a depth of eleven feet below grade. The <br /> tanks' piping system is located under a concrete vault. Since the tanks' piping was not <br /> accessible for removal, the SJCEHD inspector(Michael Kith)directed Aronson representatives <br /> to abandon the piping system with a slurry pack. Piping abandonment was completed on August <br /> 14, 1997. <br /> The removed was loaded onto a flat-bed trucks for transport offsite. The tank was <br /> transported by Erickson Incorporated to the Erickson,Inc. facility in Richmond, California,for <br /> recycling. The tank was transported under manifest control (No. 95593271). Copies of the <br /> manifest and the certificate of destruction for the tank are included as Appendix C. <br /> No petroleum impacted soils were encountered beneath the diesel fuel tank upon removal. IT <br /> Corporation, Pacific Bell and SJCEHD representatives determined that overexcavation of the <br /> area was not necessary, but Michael Kith required the removal of the concrete slab (located <br /> under the 3,500 gallon diesel tank)prior to the installation of the new 1,000 gallon tank. <br /> 2.2 Soil Sampling <br /> P 9 <br /> Under the direction of SJCEHD Inspector Michael Kith on August 6, 1997,four soil samples <br /> (PBST-DN, PBST-DS,PBST-DE, and PBST-DV) were collected from the diesel tank <br /> excavation. Four discreet sample sleeves were collected from the overburden soil stockpile. <br /> These discreet samples were combined by the laboratory into two (2)point composite soil <br /> samples (STP-1, and STP-2). At the direction of Michael Kith,five undisturbed soil samples <br /> were collected from under the concrete vault containing the UST piping on August 14, 1997. <br /> cAsydney\pbstock.ust 2 <br />