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District CEQA Reference No:20130578 Page 2 of 4 1a) Project Emissions should be identified and quantified. i) Operational Emissions: Permitted (stationary sources) and non-permitted (mobile sources) sources should be analyzed separately. Preparation of an Environmental Impact Report (EIR) is recommended should emissions from either source cannot be reduced or mitigated to below the following levels of significance: 10 tons per year of oxides of nitrogen (NOx), 10 tons per year of reactive organic gases (ROG), or 15 tons per year particulate matter of 10 microns or less in size (PM10). ii) Pre- and post-project emissions should be identified. 1b) Nuisance Odors should be discussed as to whether the project would create objectionable odors affecting a substantial number of people. 1c) Project related health impacts should be evaluated to determine if emissions of toxic air contaminants (TAC) will pose a significant health risk to nearby sensitive receptors. TACs are defined as air pollutants that which may cause or contribute to an increase in mortality or serious illness, or which may pose a hazard to human health. The most common source of TACs can be attributed to diesel exhaust fumes that are emitted from both stationary and mobile sources. Health impacts may require a detailed health risk assessment (HRA). Prior to conducting an HRA, an applicant may perform a prioritization on all sources of emissions to determine if it is necessary to conduct an HRA. A prioritization is a screening tool used to identify projects that may have significant health impacts. If the project has a prioritization score of 1.0 or more, the project has the potential to exceed the District's significance threshold for health impacts of 10 in a million and an HRA should be performed. If an HRA is to be performed, it is recommended that the project proponent contact the District to review the proposed modeling approach. The project would be considered to have a significant health risk if the HRA demonstrates that project related health impacts would exceed the District's significance threshold of 10 in a million. More information on TACs, prioritizations and HRAs can be obtained by: E-mailing inquiries to: hramodeler a@valleyair.org; or Visiting the District's website at: http://wwvv.valleyair.org/busind/pto/Tox_Resources/Ai rQualityMonitoring.ht m