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DRAFT <br /> For lead, the 95 percent UCL lead concentration of 90 mg/kg in soils was well below the <br /> child receptor-based lead in soil target concentration and the industrial receptor-based <br /> lead in soil target concentration. Consequently,the soil lead concentration in Area 2B <br /> does not appear to represent a potential health hazard. <br /> Area 3 <br /> Noncarcinogenic HIs at Area 3 were less than one for the construction worker, landscape <br /> maintenance worker, and commercial/industrial worker. HIs were greater than one for <br /> the resident, primarily due to the presence of arsenic in soil. <br /> Excess cancer risk for the resident was greater than 1E-06,primarily due to the presence <br /> of arsenic in soil through the dermal and ingestion routes of exposure. <br /> Further evaluation of natural background arsenic concentrations in the Stockton area <br /> should be considered prior to implementing remedial actions at Area 3. <br /> The maximum lead concentration in Area 3 soils of 710 mg/kg was greater than the child <br /> receptor-based lead in soil target concentration but less than the industrial receptor-based <br /> lead in soil target concentration. Lead concentrations in soil at Area 3 ranged from less <br /> tthan 6.5 to 710 mg/kg. Based on the maximum soil lead concentration in Area 3 that is <br /> higher than the target blood lead concentration for the child resident,there is a potential <br /> 1 health concern at Area 3 due to lead in soil. <br /> Area 4 <br /> Noncarcinogenic HIs were less than one for the construction worker, landscape <br /> maintenance worker, and resident. The indoor commercial/industrial worker was not <br /> evaluated in Area 4 because no VOCs were detected in soil and groundwater samples. <br /> Excess cancer risks at Area 4 were within the acceptable range of 1E-04 to 1E-06 for the <br /> construction worker and landscape maintenance worker. The excess cancer risk for the <br /> resident was greater than the 1 E-06 acceptable risk for residential site use. Data indicate <br /> 1 SOMA 99-2218 <br /> 21 12/10/99 <br />