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REV: 02-15-23 RL pathway exposure adjustments. The HRA will evaluate impacts from TAC emissions using the most recent methodology and OEHHA toxicity values. The HRA will be performed using HARP2. The HARP2 model will calculate the cancer risk and chronic hazard index at locations within the project site. Consultant will perform one set of HARP2 modeling runs. The BAAQMD stationary source tool provides conservative screening level cancer risk, chronic hazard index, and PM2.5 concentration for each source that has a permit. Consultant will obtain the cancer risk and chronic hazard index values for all sources within 1,000 feet of the proposed project and will apply the BAAQMD distance multiplier tool to determine the potential impact within the proposed project site from nearby stationary sources. Consultant will combine the Highway 101 modeling results with the impacts from the stationary source cancer and chronic risk and compared to the BAAQMD HRA significance thresholds per their CEQA Air Quality Guidelines (2017). Task 4 – Prepare PM2.5 Assessment The PM2.5 assessment will follow the methodology and impact thresholds outlined in the BAAQMD’s Recommended Methods for Screening and Modeling Local Risks and Hazards (2012) document. Consultant will conduct PM2.5 modeling to determine the annual concentrations on the project site from vehicles traveling on Highway 101. Impacts from nearby industrial and institutional facilities will be determined using the BAAQMD stationary source tool. Consultant will prepare refined PM2.5 modeling analyses using AERMOD with the same parameters determined for the HRA modeling. The modeling will include PM2.5 exhaust from all fuel sources and road dust emissions to estimate annual PM2.5 concentrations on the project site. Consultant will perform one set of AERMOD PM2.5 modeling runs. The BAAQMD stationary source tool will be used to obtain PM2.5 concentrations for each source within 1,000 feet of the proposed project and will apply the BAAQMD distance multiplier tool to determine the PM2.5 concentrations within the proposed project site from nearby stationary sources. Consultant will combine the Highway 101 modeled PM2.5 concentrations with the stationary source PM2.5 concentrations and compared to the BAAQMD PM2.5 significance thresholds per their CEQA Air Quality Guidelines (2017). Task 5 – Prepare Health Risk Assessment Report Consultant will prepare a brief technical report that will summarize the HRA and PM2.5 modeling methodology, the method for determining nearby stationary source contributions to impacts, and the results. The report will include a discussion of the ambient PM2.5 concentrations in the area as measured at the nearest BAAQMD ambient air monitoring station equipped to measure PM2.5 and regional cancer risk ATTY/AGR.2023.020/Yorke Engineering, LLC (Bayfront Health Risk Assessment) (Page 12 of 14)