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my _ r• __ m '�"'i _ � .t�'`� ' _ �' """ - '� psi ..�i-- -a-ar <br /> ealeltalit <br /> Environmental Compliance Consulting <br /> UNDERGROUNI) TANK REMOVAL PROCEDURES <br /> The victual tank excavations were performed by employees of Cozad Custom <br /> Trailer according to local Fire Department protocol; The inert atmosphere <br /> tan k<< were transported from the site to salvage by the company Western <br /> Meter (2735 fee Yee Drive, Stockton CA.) <br /> The first tank to be removed on 28 April was Elie 1000 gallon leaded gasoline <br /> tank. Samples from the floor of the excavation (north & south) were obtained <br /> by .teff Mlller,[witnessed by Harlan Knoll of San Joaquin County Environmental] <br /> and transported, under Chain-of-Custody to California Water Labs in Modesto. <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 aught to have been reported as 200 mg/kg] and total Xylenes at 5600 ug/kg, <br /> [which again aught to have reported as 5.6 mg/kg]. Total Lead (Pb) concen- <br /> trations from north and south locations were comparable and should be con- <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 /> excavation be removed another foot and samples taken. This was accomplished <br /> by Cozad employees and the sampling by Troy Williams of Universal Engineering <br /> on 23 May 1982. The samples were transported under Chain-of--Custody to <br /> Precision Analytical Laboratory in Richmond; On 5 June, the returned analytical <br /> results indicar.ed TPI{ as gasoline at 124 mg/kg. June 22, 1 sen L• 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 [witnessed by Darlene Reuss of San Joaquin <br /> County Environmental] and transported under Chain-of-Custody to Groundwater <br /> Technology Laboratory in Concord. All Four samples showed_nothing detectable--- - ---- <br /> as either diesel, gasoline or BTEX. <br /> Page 2 <br />