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• Draft Supplemental Environmental Impact Report Page IV.E-6 Forward Inc. Landfill 2018 Expansion Project level) of the given air toxic by its specific unit risk factor or potency slope. The unit risk factor or potency slope of an air toxic is derived from epidemiological studies, and the published values are based on the assumption that a person would be exposed to the given air toxic at that • dosage constantly for 30 years or for the worst-case 30-year span over life of the project. The • cancer risk from current landfill operations is calculated to be 1.2 x 10'5. Health risks (acute'and chronic'impacts) for each non-carcinogenic air toxics are determined using a Hazard Index (HI), which is the ratio of the predicted exposure concentration to a threshold level that could cause adverse health effects other than cancer, as established by the • OEHHA. The Hazard Quotient (HQ) of each non-carcinogenic substance is added to the calculated HQ of the other non-carcinogens to produce an overall HI. Existing health risks from the current landfill operations are calculated to be 0.0004 for the acute HI, 0.00005 for the chronic HI. Impacts This section includes a summary of impacts and mitigations considered in the 2013 EIR, and has been updated to include impacts and mitigations that are new or have been substantially • altered by changes in the proposed project. To facilitate review of the section and comparison • of analyses between the 2013 EIR and this document, the heading for each impact or mitigation measure reflects whether that impact is the same, revised, replaced, or new. • Standards of Significance For the purposes of this section, impacts and mitigation measures identified in the 2013 Forward Landfill Expansion EIR were reviewed and incorporated as appropriate. This impact section evaluates the currently permitted activities and proposed project described in the Project • Description that could potentially result in impacts to 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: • 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 operation of any project with the potential to expose sensitive receptors to substantial levels • of air toxics would be deemed to have a potentially significant impact. More specifically, • proposed projects that have the potential to expose the public in excess of the following • thresholds would be considered to have a significant air quality impact (Per the SJVAPCD's A health effect(non-cancer)produced within a short period of time(few minutes to several days) • following an exposure to air toxics A health effect(non-cancer) produced from a continuous exposure occurring over an extended period of time (weeks,months,years)