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Closure Report 25 Golden Grain Manteca Bean Facility,299 Moffat Boulevard,Manteca,California July 16, 19% ' 6 0BASED- APPROACH FOR SITE CLOSURE RISK This section describes the nsk-based criteria (RBC) approach used to support closure of Golden Grain's Manteca Bean Facility The development of RBCS for this application involves the integration of risk assessment methodologies recommended by the U S Environmental Protection Agency (USEPA) and the Department of Toxic Substances Control, Cal/EPA Chemical concentration levels that would be protective of human health and the environment are developed based on the current and future land use of the site ' 6.1 Objectives of the RBC Approach ' The objective of an RBC approach is to enable the nsk managers to reach a decision on the chemical concentrations that may be left in the environmental media without posing potential ' adverse effects on the exposed individual To develop the proposed cleanup levels,the RBC approach utilizes the same four components of a baseline risk assessment, namely ■ identification of chemicals of potential concern ■ exposure assessment ' toxicity assessment risk characterization ' The RSC approach will be conducted according to the guidelines established in the fallowing documents ■ Risk Assessment Guidance for Supertund, Part A, Vol 1 Human Health Evaluation t Manual, USEPA, 1989 ■ Risk Assessment Guidance for Supertund, Part A, Vol 1 Human Health Evaluation ' Manual, Supplemental Guidance Manual, "Standard Default Exposure Factors," USEPA, 1991 ' ■ Dermal Exposure Assessment Principles and Applications, USEPA, 1992 ' w Guidance for Data Useability in Risk Assessment, USEPA, 1992 ■ Preliminary Endangerment Assessment Manual, Department of Toxic Substances ' Control, Cal/EPA, 1994 ■ Superfund Exposure Assessment Manual USEPA, 1988 ' 420201&CR FLUOR DANIEL,GTI