AGENDA FULL PACKET - Laserfiche WebLink

Screening Health Risk Assessment for the Residences at California Center Project in the City of Pleasanton, California 2 Screening Health Risk Assessment Overview Health risk impacts are evaluated based on exposure to toxic air contaminant (TAC) emissions. In addition, the BAAQMD recommends evaluating fine particulate matter (PM2.5) emissions since it is often associated with fossil fuel exhaust TAC emissions. A TAC is defined by California Health and Safety Code Section 39655. As per the definition, all federal hazardous air pollutants (HAPs) are considered as TACs: “Toxic air contaminant” means an air pollutant which may cause or contribute to an increase in mortality or in serious illness, or which may pose a present or potential hazard to human health. A substance that is listed as a hazardous air pollutant pursuant to subsection (b) of Section 112 of the federal act (42 U.S.C. Sec. 7412(b)) is a toxic air contaminant.” ESA evaluated the health risks and hazards (including PM2.5 concentrations) from existing sources on the future receptors at the Project Site and the results were compared to the applicable BAAQMD significance thresholds. Significance Thresholds The potential air quality impacts to future users of the Project are evaluated according to the significance criteria in the BAAQMD CEQA Air Quality Guidelines. According to these guidelines, the Project would result in a significant air quality impact if it would have the following: Risk and hazards for new sources and receptors (individual project): – Increased Cancer Risk greater than 10 in a million. – Increased Non-Cancer greater than 1.0 Hazard Index. – PM2.5 concentration increase greater than 0.3 micrograms/cubic meters (µg/m3) annual average. Risk and hazards for new sources and receptors (cumulative threshold): – Cancer Risk greater than 100 in a million (from all local sources). – Non-Cancer greater than 10.0 Hazard Index (chronic, from all local sources). – PM2.5 concentration greater than 0.8 µg/m3 annual average (from all local sources). The numerical thresholds above are consistent with the applicable health risk thresholds included in BAAQMDs 2022 CEQA Guidelines (BAAQMD 2023). Technical Approach Impacts from nearby existing stationary sources were analyzed consistent with the BAAQMD CEQA Guidelines (BAAQMD 2023). The BAAQMD provides screening analysis tools to evaluate potential health risk impacts from exposure to TACs. The BAAQMD’s Health Risk Screening and Modeling – Stationary Source Screening Map Tool (BAAQMD 2022a) is a geographic information systems (GIS) map of all the stationary sources permitted by the BAAQMD with cancer risk, hazard estimates, and PM2.5 concentrations. The BAAQMD notes that the tool does not estimate acute hazards since these screening levels were found to be significantly below the thresholds. According to the BAAQMD, sources within 1,000 feet of the Project Site boundary should be included in a health risk assessment. Based on a survey of stationary sources using the Stationary Source Screening Analysis Map Tool, there are no stationary sources located within 1,000 feet of the Project Site. However, a stationary source is located just outside of the 1,000-foot distance from the Project Site (i.e., within