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r Draft Supplemental Environmental Impact Report Page IV.E-2 Forward Inc. Landfill 2018 Expansion Project ' Health Hazard Assessment(OEHHA), and the State Water Resource Control Board (SWRCB) and associated Regional Water Quality Control Boards (RWQCB). The DTSC is generally charged with oversight of hazardous materials and waste. The Regional Water Quality Control Board (Central Valley Region) is the lead regulatory agencies for the protection of the waters of California potentially endangered by pollution. In turn, local jurisdictions such as the San Joaquin County Certified Unified Programs Agency (CUPA)may take the lead agency role as a Local Oversight Program entity, implementing State as well as local policies. At the project site, the lead agencies for hazardous materials and any associated potential contamination to the environment are the DTSC and RWQCB Department of Toxic Substances Control The DTSC works in conjunction with the EPA to enforce and implement specific laws and regulations pertaining to hazardous wastes. California legislation, for which DTSC has primary ' enforcement authority, includes the Hazardous Waste Control Act and the Hazardous Substance Account Act. Most State hazardous waste regulations are contained in Title 27 of the California Code of Regulations (CCR). The DTSC generally acts as the lead agency for soil and ' groundwater cleanup projects, and establishes cleanup and action levels for subsurface contamination that are equal to,or more restrictive than, federal levels. Office of Environmental Health Hazard Assessment The mission of the OEHHA is to protect and enhance public health and the environment by objective scientific evaluation of risks posed by hazardous substances. An HRA involving four steps;hazards identification,exposure assessment,toxicity assessment, and risk character- ization,was conducted in accordance with published guidance, including the OEHHA Air Toxics Hot Spots Program Risk Assessment Guidelines, Guidance Manual for Preparation of Health Risk Assessments. ' State Water Resource Control Board The project site is located in the jurisdiction of the Central Valley Regional Water Quality Control Board (Water Board or RWQCB). The Water Board is authorized by the California ' Porter-Cologne Water Quality Act of 1969 to implement water quality protection laws. The Water Board provides oversight for sites at which the quality of groundwater or surface waters is threatened, and has the authority to require investigations and remedial actions. California's hazardous waste laws are codified in the California Code of Regulations (CCR). In general, a material is a hazardous waste if it poses a threat to human health or the environment. Under California law, approximately 800 substances are listed as potentially hazardous depending on their property or combination of properties. A hazardous waste can be present in a liquid, semi-solid, solid, or gaseous form. California law requires that the generator of a r r r