CONSTRUCTION AND OPERATIONAL HEALTH RISK ASSESSMENT
08/4/2025 OPERATIONAL IMPACTS Residential Exposure Scenario - How do they know this without a tenant in mind?
This report evaluates the potential health risk impacts to sensitive receptors (which are residents)and adjacent workers associated with the development of the Project, more specifically, health risk impacts as a result of exposure to Toxic Air Contaminants (TACs) including diesel particulate matter(DPM) as a result of heavy-duty diesel trucks and equipment associated with on-site and off-site construction and operational activity. This section summarizes the significance criteria and Project health risks. The results of the health risk assessment from Project-generated DPM emissions are provided in Tables ES-1, ES-2, and ES-3.
The maximum incremental cancer risk attributable to Project operational-source DPM emissions at the nearest residential receptor is estimated at 0.33 in one million which would not exceed theSCAQMD’s significance threshold of 10 in one million. At this same location, non-cancer risks were estimated to be ≤0.01 which would not exceed the applicable significance threshold of 1.0. All other modeled receptors would be exposed to lower concentrations of DPM, all other receptors in the vicinity of the Project would be exposed to less emissions and therefore less risk than the MEIR identified herein. As such, the Project will not cause a significant human health or cancer risk to nearby residences.
2.7.2 Construction Impacts Residential Exposure Scenario The MEIR with the greatest potential exposure to Project construction-source DPM emissions isLocation R2 which represents the existing residence at 18292 Parkview Lane Apartment 204, approximately 73 feet east of the Project site. At the MEIR, the maximum incremental cancer risk attributable to Project construction-source DPM emissions is estimated at 4.02 in one million. As such, cancer risks at the MEIR associated with the Project are less than the SCAQMD significance threshold of 10 in one million. At this same location, non-cancer risks were estimated to be ≤0.01,which would not exceed the applicable threshold of 1.0. The MEIR would experience the highest concentrations of DPM during Project construction due to its location and meteorological conditions at the site. Because all other modeled receptors would experience lower concentrations of DPM during Project construction, all other receptors in the vicinity of the Project would be exposed to less emissions and therefore less risk than the MEIR identified herein. As such, the Project will not cause a significant human health or cancer risk to adjacent land uses as a result of Project construction activity. All other receptors during construction activity would experience less risk than what is identified for this location.
Reference Number16420-02 HRA Report