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Appendix C-1: AERMOD Parameters, Assumptions, and Results for DPM Emissions from Haul Trucks along the Haul Route <br />Overview <br />AERMOD Results for Annual Average DPM Concentrations based on Unit Emission Rate (µg/m3) <br />Source Area <br />Receptor Distance <br />(feet) <br />Maximum <br />Concentration1 <br />Haul Truck Travel 65 22.19 <br />Model Assumptions for Haul Truck Travel <br />Modeled Source Type Line-Area Source <br />Road Width (meters)6.7 Double-lane road with 22 feet <br />Length of Side (meters)12.7 Width of a two-lane road + 6 meter <br />Line Length (meters)1,140 Haul road segment <br />Vehicle Height (meters)4.0 Typical height of heavy-duty trucks <br />Plume Height (meters)6.8 1.7 * vertical height (consider traffic-induced mixing) <br />Release Height (meters)3.4 AERMOD Haul Road Area Source Calculator <br />Initial Vertical Dimension (meters)3.16 AERMOD Haul Road Area Source Calculator <br />Notes: <br />DPM = diesel particulate matter <br />µg/m3 = micrograms per cubic meter <br />1 Based on the Maximally Exposed Individual Receptor at 65 feet from the haul route. <br />Exhaust emissions of DPM from offsite haul trucks travel were used to model the annual average concentrations of DPM at sensitive receptors near the haul route. <br />Information about haul truck trips was provided by the project applicant. Emissions of DPM from haul trucks were estimated for the project condition using emissions <br />factors from the California Air Resources Board's EMFAC2021 database for the San Joaquin Valley Air Pollution Control District. The results from AERMOD, which were <br />based on a unit emission rate (1 gram/second), were updated based on the actual DPM emission rates for each source area and year of operation. <br />Attachment C HRA Page 1 of 4