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SAFEWAY MEAT PACKING FACILITY, STOCKTON, CALIFORNIA <br /> TSR II RISK BASED CORRECTIVE ACTION <br /> FEBRUARY 26, 1996 <br /> PAGE 1 - 1 <br /> 1.0 )<NTRODUCT'ION <br /> f <br /> Both USEPA Office of Underground Storage Tank (1995a) and State Water Resource Control <br /> Board guidance (December S, 1995, SWRCB 1995) indicate that the nsks associated with <br /> petroleum fuel residuals in soil and groundwater should be evaluated and considered during <br /> remedial decision making This section reviews the development of nsk-based site-specific target <br /> levels (SSTLs) for the former Safeway Meat Packmg Plant site in Stockton using the American <br /> Society for Testing Materials (ASTM) standard for Risk-Based Corrective Action Applied at <br /> Petroleum Release Sites (RBCA) The RBCA is a risk assessment procedure developed for <br /> assessing threats to human health and groundwater impacts from petroleum hydrocarbons in the <br /> environment Its goal is to estimate the concentrations of hydrocarbons in soil and water that do <br /> not pose unacceptable asks The results of this analysis for the site in Stockton indicate that the <br /> residual levels of volatile and semivolatile organic chemicals in the soil associated with the <br /> former underground storage tanks are below those levels which pose unacceptable risks to <br /> workers and unacceptable impacts to groundwater duality <br /> 1.1 Risk Assessment Overview <br /> A risk assessment is a multidisciplinary evaluation of impacts on chemicals receptors that can be <br /> ' used two ways First, a risk assessment is done to analyze the baseline threats to human health <br /> and the environment That is, this type of assessment is done to identify and evaluate the <br /> Potential impacts of chemicals at the site under existing conditions and without remediation The <br /> results of a baseline risk assessment are used to help determine the need for remedial action at <br /> a site The second use of a risk assessment is to determine the concentrations of chemicals that <br /> can remain in soil and/or groundwater and still adequately protect public health and the <br /> 01310,71 <br />