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DRAFT <br /> 2.0 SUMMARY AND CONCLUSIONS <br /> Noncarcinogenic hazards and carcinogenic risks were evaluated at the South Shore <br /> properties comprised of Areas 2A, 2B, 3, and 4. For each site,potential receptors <br /> evaluated included the construction worker, landscape maintenance worker, <br /> commercial/industrial worker, and resident. At Area 4, the indoor commercial/industrial <br /> worker was not evaluated because VOCs were not detected in groundwater or soil and <br /> therefore, volatilization of chemicals was not a concern. <br /> Both a ng <br /> oncarcino enic and carcinogenic evaluation was conducted to evaluate chemical <br /> exposures from soil and groundwater at each area to potential receptors. For the <br /> 1 evaluation, a hazard index greater than a value of one is considered to <br /> noncarcinogemc eva , <br /> represent a potential threat to human health warranting additional evaluation. For the <br /> carcinogenic evaluation, the summed estimated total lifetime excess cancer risk of less <br /> than 1E-06 is considered by Cal EPA to be an acceptable excess cancer risk to human <br /> health from carcinogens for the residential scenario. A summed estimated total lifetime <br /> excess cancer risk in the range of 1E-04 to 1E-06 is generally considered to represent an <br /> acceptable excess cancer risk for a non-residential site use. <br /> using the CalEPA LeadSpread Pb6 model, a one-compartment <br /> Lead in soil was evaluatedg <br /> bio-uptake and kinetic model to develop lead in soil target concentrations. The child <br /> receptor-based lead in soil target concentration is 485 mg/kg. The industrial receptor- <br /> based lead in soil target concentration is 5486.3 mg/kg. These values were used to <br /> evaluate the lead concentrations for each applicable investigation area. <br /> 1 <br /> Based on results of the risk evaluations conducted for each investigation area,results are <br /> summarized briefly below. <br /> SOMA 99-2218 <br /> 19 12/10/99 <br />