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5.0 HUMAN HEALTH RISK ASSESSMENT An HRA for the Site will be submitted in conjunction with the RAW. The details of the HRA will be discussed in an HRA scoping meeting between DTSC's Human and Ecological Risk Department (HERD), PG&E, Parsons and Iris Environmental. A technical memorandum will be submitted to HERD for review and approval, which documents the requirements identified for the HRA in the scoping meeting. Thereafter, the HRA will be initiated and incorporated into a streamlined HRA/FS/RAW document, to be submitted to DTSC for their review and approval. The primary purpose of the HRA will be to determine whether the concentrations of chemicals detected at the Site, during previous investigations as well as this RI/SSI, would pose a risk to current or future on-site and off-site populations. The results of the HRA will be used to identify those areas of the Site to be targeted for remediation, and to define the ultimate level of remediation that would be required to restore the Site to conditions that would be protective of all potential future land uses to the extent practicable and feasible, given the potential limitations associated with structures and the operating facility. As the overall remedial action objective is to remediate to a point that the Site would have no land-use restrictions and could be used for residential purposes, the focus of this HRA will be to characterize risks to future hypothetical residents and develop appropriate health-based target cleanup goals that would be protective of future on-site residential populations. In the unlikely event that the remediation is not effective in restoring the Site to a condition that is suitable for future on-site activities, a range of commercial cleanup goals can be used to evaluate the types of institutional controls, if any, that may appropriate for the long-term management of the Site. PARSONS 44 FINAL RI REPORT-FORMER TRACY MGP APRIL 2010