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4.1 – Air Quality Draft Environmental Impact Report February 2021 14800 W. Schulte Road Logistics Center 4.1-33 Table 4.1-7. Operational Health Risk Assessment American Meteorological Society/U.S. Environmental Protection Agency Regulatory Model Operational Principal Parameters Parameter Details Meteorological Data The latest 5-year meteorological data (2004–2008) for the City of Tracy station (Station ID 99008) provided by the SJVAPCD were downloaded (SJVAPCD 2018b) then input to AERMOD. For cancer or chronic noncancer risk assessments, the average cancer risk of all years modeled was used. Urban versus Rural Option Rural dispersion option was selected due to the undeveloped nature of the Project area. Terrain Characteristics Digital elevation model files were imported into AERMOD so that complex terrain features were evaluated as appropriate. The National Elevation Dataset (NED) dataset with resolution of 1/3 arc-second was used (SCAQMD 2018). Emission Sources and Release Parameters Air dispersion modeling of operational activities was conducted using mobile source diesel PM10 exhaust emissions generated using EMFAC2017. The yard truck and diesel-fueled fire pump diesel PM10 exhaust emissions were estimated using CalEEMod. The diesel fuel storage tank VOC emissions were estimated using TANKS 2.0.9d and toxic air contaminant emissions were estimated using SJVAPCD’s Storage Tank Diesel Fugitives emission workbook (SJVAPCD 2016c). Source Release Characterizations • Off-site and on-site truck travel were modeled as a line of adjacent volume sources, and based on EPA methodology, the modeled sources would result in a release height of 3.4 meters, a plume height of 6.8 meters, and a plume width of 9.3 meters (EPA 2015; SBCAPCD 2020). • The truck idling emissions at loading docks were modeled as a line of volume sources with a release height of 4 meters, a plume height of 6.8 meters, and plume width of 3.3 meters (EPA 2015; SBCAPCD 2020; SCAQMD 2003). • The yard truck was modeled as a line of volume sources assuming a plume height of 6.8 meters, plume width of 3.3 meters, and release height of 3.4 meters (EPA 2015). • Based on dimension of a diesel-fueled CAT forklift, the forklift was modeled as a line of volume sources assuming a plume height of 4.85 meters, plume width of 2.25 meters, and release height of 2.42 meters (CAT Lift Trucks 2020). • Based on information from the applicant, the Project would install a Clarke John Deere JU6H-UFADD0 351-horsepower diesel-fueled fire pump. Thus, the modeling parameters (i.e., exhaust velocity, exhaust temperature) were obtained from the applicant and manufacturer specifications. The fire pump was modeled to have a release height of 1.91 meters, inside stack diameter of 0.15 meters, stack temperature of 816°F, and exhaust flowrate of 0.89 cubic meters per second. • Based on tank dimension information from the applicant and modeling guidance from the SJVAPCD, the diesel fuel storage tank working and breathing emissions were modeled as a point source with a release height of 2 meters, exhaust velocity of 0.001 meters per second, stack inside diameter of 0.001 meters, and tank exhaust temperature of 0°F (SJVAPCD 2006). • The Project buildings and the nearby warehouse were modeled to account for building downwash for point sources. Notes: AERMOD = American Meteorological Society/Environmental Protection Agency Regulatory Model; SJVAPCD = San Joaquin Valley Air Pollution Control District; SCAQMD = South Coast Air Quality Management District; EPA = U.S. Environmental P rotection Agency; PM10 = particulate matter with an aerodynamic diameter less than or equal to 10 microns. See Appendix B Regarding receptors, the operational scenario used a coarse Cartesian receptor grid with 100-meter spacing out to 1,000 meters and a fine Cartesian receptor grid with 50-meter spacing out to 500 meters from the Project site and either side of the line volume source.