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Page 2 PUD-105 and P14-0852 July 9, 2019 JDEDZ Health Risk Assessment The HRA evaluates potential health risks associated with toxic air contaminants(TACs)resulting from the JDEDZ. Health risks were assessed for exposure of nearby sensitive receptors to TAC emissions resulting from construction and operation of the JDEDZ. The HRA was conducted to evaluate whether construction and operation of the JDEDZ would expose sensitive receptors to substantial concentrations of TACs or respirable particulate matter,and whether JDEDZ project-level impacts related to TAC exposure would be significant. The HRA was also prepared to assess the exposure of sensitive receptors to cumulative concentrations of TACs and respirable particulate matter from construction and operation of the JDEDZ when combined with past, present and other reasonably foreseeable development in the vicinity, including existing permitted stationary sources and Interstates 680 and 580. The HRA evaluates JDEDZ risks at existing on-site businesses and surrounding residential units, businesses and fitness clubs that are within 1,000 feet of the JDEDZ boundary. Both sensitive receptors and worker receptors within the study domain were included. Although the Bay Area Air Quality Management District(BAAQMD) does not consider worker receptors as sensitive receptors, and therefore does not require that HRAs include worker risk evaluation,the HRA includes worker risk for existing off-site and existing on-site worker exposures to provide a comprehensive and conservative assessment of potential risk associated with the JDEDZ. The maximum potential lifetime excess cancer risk associated with the JDEDZ is 5.4 in a million (occurs at an off-site residential receptor location), which would not exceed the BAAQMD cancer risk threshold of 10 in a million. The maximum potential chronic health risk associated with the JDEDZ is 0.52(occurs at an off- site worker receptor location), which would not exceed the BAAQMD's hazard index threshold of 1. The maximum potential annual average PM2.5 concentration associated with the JDEDZ is 0.22 micrograms per cubic meter(pg/n?) (occurs at an off-site worker receptor location), which would not exceed the BAAQMD's threshold of 0.3 pg/m3. Therefore,JDEDZ project-level impacts due to exposure of TACs to sensitive receptors would be less than significant. The maximum potential cumulative lifetime excess cancer risk associated with the JDEDZ and all background TAC sources within 1,000 feet of the project is 86.5 in a million (occurs at an off-site worker receptor location), which would not exceed the BAAQMD cumulative cancer risk threshold of 100 in a million. The maximum potential cumulative chronic health risk associated with the JDEDZ is 0.64(occurs at an off-site worker receptor location), which would not exceed the BAAQMD's hazard index threshold of 10. The maximum potential cumulative annual average PM2.5 concentration associated with the JDEDZ is 0.59 ,ug/m3(occurs at an off-site worker receptor location), which would not exceed the BAAQMD's threshold of 0.8 pg/m3. Therefore,cumulative impacts due to exposure of TACs to sensitive receptors would be less than significant. Updated Air Quality Technical Memorandum- Criteria Pollutant Emissions Analysis The technical memorandum presents the updated criteria pollutant emissions analysis for Section 4.B—Air Quality of the SEIR for the JDEDZ. As noted above,a HRA has been prepared and is also being added to the SEIR.Consistent with new modeling data used for the HRA,this technical memorandum supplements Section 4.B of the Draft SEIR with an updated analysis of criteria pollutants emissions including reactive organic carbon (ROG), nitrogen oxides(NOx),construction related exhaust particulate matter(PM), particulate matter with an aerodynamic diameter equal to or less than 10 microns(PM10),particulate matter with an aerodynamic diameter equal to or less than 2.5 microns(PM25),and carbon monoxide(CO). COMMUNITY DEVELOPMENT— P. O. BOX 520, Pleasanton, CA 94566-0802 Planning Building&Safety Engineering Traffic Inspection 200 Old Bernal Ave. 200 Old Bernal Ave. 200 Old Bernal Ave. 200 Old Bernal Ave. 157 Main St. (925)931-5600 (925)931-5300 (925)931-5650 (925)931-5650 (925)931-5680 Fax: 931-5483 Fax: 931-5478 Fax: 931-5479 Fax: 931-5479 Fax: 931-5484