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FIR _n <br /> ��> m <br /> Environmental Compliance Consulting _ <br /> 0D ERGROUNO TANK REMOVAL PROCEDURES <br /> The actual tank excavations were performed by employees of Cozad Custom <br /> Trailer according to local Fire Department protocol; The inert atmosphere <br /> tanks were transported from the site to salvage by the company Western <br /> Mecer (2735 Tee Pee Drive, Stockton CA.) <br /> The first tank to be removed on 28 April was the 1000 gallon leaded gasoline <br /> tank. Samples from the floor of the excavation (north S south) were obtained <br /> by Jeff Miller,(witnessed by Harlan Knoll of San Joaquin County Environmental] <br /> and transported, under Chaim-of--Custody to California 'water Labs in Modesco. <br /> The analytical results reported May 11 indicated contaminated soil at the <br /> north end of the excavation where TPH as gasoline was reported at 200,000ug/kg, <br /> (which ought co have beer. reported as 200 mg/kg] and Local Xylenes at 5600 ug/kg, <br /> (which again ought to have reported. as 5.6 mg/kg]. -ital Lead (Pb) concen- <br /> trations from north and south locations were comparable and should be can <br /> sidered natural soil abundance; in fact, these concentrations were approximately <br /> half the concentration of lead in the evaporation/rainwater sump located on <br /> the far east perimeter of the property. <br /> When these results were communicated to me, I suggested that the floor of the <br /> excadacion be removed another foot and samples taken. This was accomplished <br /> by Cozad employees and the sampling by Troy Williams of Univr.sal Engineering <br /> on 23 May 1989. The samples were transported under Chain-of-Custody to <br /> Precision Analytical Laboratory in Richmond; On 5 June, the returned analytical <br /> results indicated TPS as gasoline at 124 mg/kg. June 22, I sent another <br /> letter to Cozad indicating that perhaps another 18 inches should be excavated <br /> from the floor. June 27, the two underground diesel tanks were excavated and <br /> removed, four soil samples were obtained from the floor of this excavation by <br /> Greg Reed of Universal Engineering (wicne:sed by Darlene Reuss of San Joaquin <br /> County Environmentall and transported under Chain-of-Custody to Groundwater <br /> Technology Laboratory in Concord. All four samples shoved nothing detectable <br /> as either diesel, gasoline or BTEY. <br /> `--'' Page 2 <br />