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I Draft Supplemental Environmental Impact Report Page IV.E-5 ' Forward Inc. Landfill 2018 Expansion Project section). California Health Care Facility on the site of the former Karl Holton Youth ' Correctional Facility, is located west of Austin Road approximately 1,900 feet from the northernmost existing Forward Landfill disposal area and approximately 300 feet north of the soil borrow area in the California Health Care Facility's parcel. A women's prison,the Northern California Women's Facility, is located farther north of the site, at the southwest corner of Arch and Austin Roads. The women's prison is currently closed and does not house any inmates. ' As described in more detail in Chapter III of this EIR,the following projects are proposed or approved within two miles of the landfill: • Arch Road Industrial Project • Archtown Industrial Project • Northern California Re-Entry Facility and renovation of adjacent Dewitt-Nelson Youth Correctional Facility • NorCal (formerly Opus)Logistics Center All existing and future receptors are considered in the health risk assessment since a grid base is used for the model that includes all sites,whether they are occupied or not,per SJVAPCD guidance. Health Risk Assessment SCS Engineers prepared an HRA for the applicant that evaluates toxic air contaminant(TAC) ' emission levels for the Forward Landfill. The objective of the HRA is to evaluate potential health risks that may occur as a result of the proposed landfill expansion due to LFG emissions ' from the landfill surface,LFG control devices and mobile source emissions. The original HRA was peer-reviewed by Miller Environmental Consultants/KB Environmental Sciences,prior to incorporation into the 2013 EIR.The HRA information was further updated based on comments ' on the 2013 EIR and also changes to the Project Description for the currently proposed project. The HRA focuses on quantifying potential health risks (cancer and non-carcinogenic)associated with off-site residents and off-site workers resulting from pollutant emissions from the proposed landfill modifications. Under CEQA, the net difference (or change)in conditions (comparing the existing to future year conditions) are evaluated to the significance thresholds. As such, the HRA is considered an incremental HRA;the cancer risks for the proposed project minus the baseline cancer risk. Cancer risk is defined as the lifetime probability of developing cancer from exposure to ' carcinogenic substances. Cancer risks are expressed as the chances in one million of contracting cancer,for example one cancer case among one million people exposed. Incremental cancer ' risks are determined by summing the individual risk for each air toxics.The incremental risk from exposure to a given air toxic is calculated by multiplying the concentration(or dosage 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