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Actual DPM Emission Rates and Scaling Factors <br />Source Area Units Existing Project <br />Haul Truck Travel gram/second 0.000052 0.000098 <br />Assumptions <br />Work days per year 365 <br />Haul trips per year (one-way)36,608 Current Condition (excluding trucks currently routed to Foothill and Forward Landfill). <br />Haul trips per year (one-way)68,432 Project Condition. <br />Haul trucks one-way trips per work day 100 Current Condition (excluding trucks currently routed to Foothill and Forward Landfill). <br />Haul trucks one-way trips per work day 187 Project Condition. <br />Trip length (miles)0.71 Modeled line source length along haul route. <br />VMT/work day 71.05 Current Condition. Based on modeled line source length and one-way trips. <br />VMT/work day 132.81 Project Condition. Based on modeled line source length and one-way trips. <br />Average hours/work day 11 Everyday: 6 am to 5 pm <br />PM10 RUNEX EF (g/mile) 0.029 EMFAC2021 Emission Rates in Valley Air District in 2024; aggregate model years; aggregate speed. <br />Seconds per work day 39,600 <br />Notes: <br />DPM = diesel particulate matter <br />g/s = grams per second <br />RUNEX = Engine Running Exhaust Emission Factor <br />Equations: <br />Truck Travel Emission Rate (g/s) = VMT/day * RUNEX EF * conversion <br />AERMOD Results for Annual Average DPM Concentrations based on Actual Emission Rates (µg/m3) <br />Source Area <br />Receptor Distance <br />(feet)Existing Project <br />Haul Truck Travel 65 0.0011618 0.0021717 <br />Notes: <br />DPM = diesel particulate matter <br />µg/m3 = micrograms per cubic meter <br />Attachment C HRA Page 2 of 4