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Draft Environmental Impact Report Page IV.E-6 P F g Forward Inc. Landfill Expansion Project In summary; the maximum estimated expansion risks/hazards (using residential risk assumption weighting) at the boundary of the landfill are 5.04 x 10"5 and are lowered to 0.15 x 10'at the downgradient residential receptors. These(10-5)values exceed USEPA's target risk range but are less than the baseline conditions. Estimates of exposure to onsite receptors were all protective of the California Occupational Safety and Health administration(OSHA) permissible exposure limits. Potential Impacts and Mitigation Measures Standards of Significance For the purposes of this section, impacts and mitigation measures identified in the 2002 Consolidated Forward Landfill EIR were reviewed and incorporated as appropriate. This impact section evaluates the currently permitted activities described in the Project Description that could potentially result in impacts to human health and the environment based on the conditions of the project area. The proposed project would have a significant impact with regard to hazardous materials if it would: Cause an increase in risk above current baseline risk fit Create a potential public health hazard;or • Involve the use, production, or disposal of materials that pose a hazard to people or animal or plant populations in the area affected,beyond baseline conditions. } + The SJVAPCD CEQA guidelines define a significant risk as one greater than 10 in 1,000,000(10 "if toxics best available control technology (T-BACT) is employed. Since T-BACT is met by current and proposed emission controls,this 10-5 level was used in the HRA as the threshold of significance for the proposed expansion project. The 2008 SCS risk assessment established the standard of meeting the requirement of acceptable risk is to result in no increase in risk above the baseline scenario of the exiting permitted use of ' the existing Forward/Austin landfill units compared to the proposed expanded plan. Thus, even if the risk factors are greater than the 10-6 excess cancer risk, or have a hazard index of greater then 1.0, they may be considered less than significant as long as they do not exceed the baseline conditions. This criteria is consistent with that used by the County in the 2002 Consolidated Forward Landfill EIR. t In addition to overall risk of exposure analyzed in the risk assessment the landfills, expanded operation must conform to safe practices for its operators and programs to minimize and appropriately manage hazardous materials. . Impacts and Mitigation Measures Impact E.1: Worker exposure to chemical contaminants and particulates during landfill operations would exceed levels protective of human health or safety. The project would increase the amount of potentially contaminated waste products because of the proposed expansion of the Class II landfill. The current landfill allows for such materials as asbestos and automobile shredder waste,and a variety of nonhazardous commercial and industrial wastes including but not limited to sewage sludge;water treatment sludge;grit/grease;holding tank pumpings;storm drain cleanings;dredge and fill materials;fiberglass;soils contaminated with petroleum hydrocarbons,metals,non-petroleum-based organics, and/or soluble solids;ash; infectious waste;metals-contaminated wastes;organic compound contaminated materials; chemical toilet waste;boiler blowdown water(in dry form only);construction and demolition waste;processed tires; septic tank pumpings;cleansed pesticide containers;and nonhazardous