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SECTIONONIE Q®t®dooda 9.2 OBJECTIVES The primary objective of this risk analysis was to evaluate the potential impacts to groundwater and human health risks due to potential exposure to residual petroleum hydrocarbons which remain in the soil and groundwater The analysis was conducted in a "worst-case" manner to evaluate what the reasonable maximum exposure concentrations night be at a hypothetical well located 500 feet and 1,000 feet downgradient The results presented in this risk assessment specifically address potential health risks associated with ingestion of groundwater, mhalation of volatiles at the surface, dermal exposure to groundwater, and soul ingestion The purpose of this risk assessment and groundwater impact analysis was to assess current and potential future risk to human health and the groundwater The objective of the risk assessment and groundwater impact analysis was to provide an objective estimation of the potential current and future risk to human health and groundwater posed by the residual petroleum hydrocarbons in soil and groundwater If the risk levels are unacceptable, the risk assessment and groundwater impact analysis may be used for evaluating site-specific remedial action goals and making risk management decisions on acceptable levels of risk I Site-specific data were used whenever possible (Sections 3 and 4) This approach is consistent with the recently issued guidance by the U S Environmental Protection Agency (EPA) Risk Assessment Council stressing the use of site-specific data to evaluate potential health risks (EPA,1992a,b) Another objective was to follow the Risk Assessment Council's guidance for nsk characterization, limiting the discussion of information to risk assessment instead of including any risk management discussions, rdent4mg key uncertainties and their potential to under- or overestimate risk, and including information on a range of exposure W1uhe the reasonable maximum exposure (RME) is designed to be a measure of"high-end" exposure and is used by risk managers in makung remedial decisions(if any)to be protective to human health, the average or central tendency risks are necessary infonmatzon to make risk management decisions (EPA, 1992c) Conservative assumptions (i e, assumptions that generally overestimate risk)were used in tins assessment when site-specific data were lacking or incomplete 9.3 SCOPE The scope of this risk assessment is linuted to the evaluation of potential health risks and groundwater impacts associated with residual contarnuiants in soil and groundwater associated with the former gasoline tanks under existing conditions and projected future land use Future site development will T%1907W78008NAWOCKTOMREPORPSHOROVI D0C%&FEWM9730WNA%MA 14