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Concentration (C) µg/m3 0.00217 0.00217 0.00217 0.00217 AERMOD Annual Average <br />Daily Breathing Rate (DBR)L/kg-day 361 1090 572 621 95th percentile (OEHHA, 2015) <br />Inhalation absorption factor (A)unitless 1.0 1.0 1.0 1.0 OEHHA, 2015 <br />Exposure Frequency (EF)unitless 0.96 0.96 0.96 0.96 350 days/365 days in a year (OEHHA, 2015) <br />Dose Conversion Factor (CFD)mg-m3/μg-L 0.000001 0.000001 0.000001 0.000001 Conversion of μg to mg and L to m3 <br />Dose (D)mg/kg/day 0.0000008 0.0000023 0.0000012 0.0000013 C*DBR*A*EF*CFD (OEHHA, 2015) <br />Cancer Potency Factor (CPF)(mg/kg/day)-1 1.1 1.1 1.1 1.1 OEHHA, 2015 <br />Age Sensitivity Factor (ASF)unitless 10 10 3 1 OEHHA, 2015 <br />Annual Exposure Duration (ED)years 0.25 2.00 14.00 13.75 Assumes 30 years of exposure <br />Averaging Time (AT)years 70 70 70 70 70 years for residents (OEHHA, 2015) <br />Fraction of time at home (FAH)unitless 0.85 0.85 0.85 0.85 OEHHA, 2015 <br />Cancer Risk Conversion Factor (CF)m3/L 1000000 1000000 1000000 1000000 Chances per million (OEHHA, 2015) <br />Cancer Risk per million 0.025 0.61 0.67 0.24 D*CPF*ASF*ED/AT*FAH*CF (OEHHA, 2015) <br />Total Cancer Risk per million Threshold = 10.0 <br />Chronic Reference Exposure Level (REL)µg/m3 5.0 5.0 5.0 5.0 OEHHA, 2015 <br />Chronic Hazard Quotient unitless 0.00043 0.00043 0.00043 0.00043 C/REL (OEHHA, 2015) <br />Maximum Chronic Hazard Index unitless Threshold = 1.0 <br />Notes: <br />DPM = diesel particulate matter <br />µg/m3 = micrograms per cubic meter <br />L/kg-day = liters per kilogram-day <br />mg/L = milligrams per liter <br />m3/μg = cubic meters per microgram <br />m3/L = cubic meters per liter <br />mg/kg/day = milligrams per kilogram per day <br />Project Condition <br />Health Risk Assessment Parameters and Results for Exposure to DPM at the Maximally Exposed Individual Receptor 65 feet from the Haul Route <br />Office of Environmental Health Hazard Assessment (OEHHA), 2015. Air Toxics Hot Spots Program Guidance Manual for Preparation of Health Risk Assessments. <br />Notes <br />1.54 <br />> 16 Year <br />Adult <br />0.00043 <br />Inhalation Cancer Risk Assessment Units <br />3rd <br />Trimester <br />0-2 Year <br />Infant <br />2-16 Year <br />Child <br />Attachment C HRA Page 4 of 4