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O.E.S.- Port Stockton <br /> 2001 E. Fremont Avenue <br /> November 9, 1990 <br /> Page -5- <br /> 5 . 0 CONCLUSIONS AND RECOMMENDATIONS <br /> Laboratory analyses indicate evidence of diesel <br /> contamination at the north end of the TK1 excavation. Condor <br /> recommends, therefore, that at least an additional 2 to 3 feet <br /> of soil be removed from the north end of the TK1 excavation . <br /> Groundwater was not encountered in the excavation. It is <br /> expected, however, that the groundwater table is relatively <br /> shallow in this location. The depth to groundwater should be <br /> determined prior to the proposed procedures to ( 1 ) insure that <br /> groundwater will not be contaminated by additional excavation, <br /> and to ( 2 ) determine if additional soil excavation will <br /> remediate the contamination at the Port Stockton site. Field <br /> observations and laboratory analysis of soil samples should be <br /> used to determine the extent of soil contamination. The <br /> removed soil and the original backfill should then be treated <br /> using biological methods to remove the diesel contamination. <br /> Lead is commonly found in soils. The reported average <br /> concentrations for lead in soil is 10 ppm (Lindsay, 1979)1 . <br /> The concentrations of lead detected in the samples from the <br /> TK1 excavation do not exceed the expected average values. <br /> hindsay, W., 1979, Chemical Equilibrium in Soils, New York: John Wiley & Sons <br /> CONDOR <br />