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1.2.3 Soil Vapor Sampling and Human Health Risk Assessment <br /> On August 29, 2008, Ramage Environmental published Soil Vapor Sampling and Human Health <br /> Risk Assessment Report, which documented the results of soil vapor sampling from five on-site <br /> locations, an updated sensitive receptor survey for the site vicinity, and a human health risk <br /> assessment. The soil vapor sample locations are shown on Figure 2, and the soil vapor <br /> re summarized in Table 4. <br /> analytical results a . <br /> ' Based on the.results of the survey, none of the identified potential sensitive receptors appear to <br /> be threatened by the petroleum hydrocarbons present.beneath the site. Results from the human <br /> health risk assessment indicated that cumulative carcinogenic risk levels for a child resident and <br /> adult worker at reasonable maximum exposure levels do not exceed the target carcinogenic risk <br /> level of one in one million, ;and that the target hazard quotient of one is not exceeded for either a <br /> child resident or adult worker. The following summarizes the results of the human health risk <br /> { <br /> assessment for child resident and adult work receptors: <br /> Child Resident Receptor <br /> Exposure Pathway Carcinogenic Hazard Quotient <br /> Risk <br /> ingestion of soil 7.7 .E-7 4.7 E-1 <br /> Dermal contact with soil 6.9 E-8 1.8 E-1 <br /> Ingestion of groundwater 0.0 . 0.0 <br /> Dermal contact with 0.0 0.0 <br /> groundwater <br /> Indoor air inhalation 2.7 E-8 3.6 E-3 <br /> Total 8.0 E-7 6.5 E-1 <br /> Adult Worker Receptor <br /> i•� Exposure Pathway Carcinogenic Hazard Quotient <br /> Risk <br /> Ingestion of soil 2.3E-7 3.6 E-2 <br /> Dermal contact with soil 1.4 E-7 8.8 E-2 <br /> Ingestion of groundwater 010 4.0 <br /> Dermal contact with 0.0 0.0 <br /> groundwater <br /> Indoor air inhalation 7.6 E-9 2.4 E-4 <br /> Total 3.8 E-7 1.24 E-1 <br /> 6 <br /> i6 ` <br />