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:. <br /> i4 <br /> - <br /> Environmental Compliance Consulting <br /> UNDERGROUND 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 /> Meter (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 5 south) were obtained <br /> by ,teff Miller,[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 ll indicated contaminated soil at the <br /> north end of the excavation where TPH as gasoline was reported at 200,000ug/kg, <br /> [which ought to have been reported as 200 mg/kg] and total Xylenes at 5600 ug/kg, <br /> [which again ought 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, 1 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 1989. The samples were transported under Chain-of-Custody to <br /> Pre..ision Analytical Laboratory in Richmond; On 5 June, the returned analytical <br /> results indicated TPH as gasoline at 124 mg/kg. June 22, 1 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 [witnessed by Darlene Reuss of San Joaquin <br /> ------ -------------------County--Environmental-]--and-transpor-ted-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 /> is <br />