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4.1 – Air Quality Draft Environmental Impact Report February 2021 14800 W. Schulte Road Logistics Center 4.1-24 Toxic Air Contaminants The SJVAPCD has established thresholds of significance for combined TAC emissions from operations of permitted and non-permitted sources (SJVAPCD 2015a). Projects that have the potential to expose the public to TACs in excess of the following thresholds would be considered to have a significant air quality impact: • Probability of contracting cancer for the maximally exposed individual equals or exceeds 20 in 1 million people .4 • Hazard Index5 for acute and chronic non -carcinogenic TACs equals or exceeds 1 for the maximally exposed individual . Odors As described in the SJVAPCD Guidance, due to the subjective nature of odor impacts, there are no quantitative thresholds to determine if potential odors would have a significant impact (SJVAPCD 2015a). Projects must be assessed for odor impacts on a case-by-case basis for the following two situations: • Generators: Projects that would potentially generate odorous emissions proposed to locate near existing sensitive receptors or other land uses where people may congregate. • Receivers: Residential or other sensitive receptor projects or other projects built for the intent of attracting people locating near existing odor sources. The SJVAPCD has identified some common types of facilities that have been known to produce substantial odors, as well as screening distances between these odor sources and receptors. These are depicted in Table 4.1 -5. Table 4.1-5. Screening Levels for Potential Odor Sources Type of Facility Screening Distance (Miles) Wastewater Treatment Facility 2 Sanitary Landfill 1 Transfer Station 1 Composting Facility 1 Petroleum Facility 2 Asphalt Batch Plant 1 Chemical Manufacturing 1 Fiberglass Manufacturing 1 Painting/Coating (i.e., auto body shop) 1 Food Processing Facility 1 Feed Lot/Dairy 1 Rendering Plant 1 Source: SJVAPCD 2015d. 4 The cancer risk threshold was increased from 10 to 20 in 1 million with approval of APR 1906 (Framework for Performing Health Risk Assessments) on June 30, 2015. 5 Non-cancer adverse health impact, both for acute (short-term) and chronic (long-term) health effects, is measured against a hazard index, which is defined as the ratio of the predicted incremental exposure concentration from a project to a published reference exposure level that could cause adverse health effects as established by the Office of Environmental Health Hazard Assessment. The ratio (referred to as the hazard quotient) of each noncarcinogenic substance that affects a certain organ system is added together to produce an overall hazard index for that organ system.