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REV: 02-15-23 RL EXHIBIT “A” SCOPE OF SERVICES AND FEE Consultant will complete a draft and a final Health Risk Assessment (HRA) at the “Bayfront Project” side located at 1402 Maple Street and 1580 Maple Street. Task 1 – Data Collection and Review Consultant will collect and review relevant data for the HRA. A data request will be prepared and sent to the City’s Parks, Recreation, and Community Services Director or their designee. The data request will include, but not be limited to, general plot plan of the proposed project and its location relative to surrounding streets and highways. Task 2 – Develop Mobile Source Emissions Using the data collected in Task 1 for the project location, Consultant will estimate mobile source exhaust emissions emanating from Highway 101 using the California Air Resources Board(CARB) approved and Bay Area Air Quality Management District(BAAQMD) approved Emission Estimation Techniques (EETs). As applicable for estimating associated traffic impacts, Consultant will obtain Average Daily Traffic (ADT) from the California Department of Transportation Traffic Census Program for the project location. Mobile source exhaust emissions will be estimated for Diesel Particulate Matter( DPM) and Partculate Matter (PM)2.5 using the Carbon emission factor (EMFAC2021) database. Because DPM has a high toxicity factor, the impacts from the Toxic Aire Contaminants (TAC) emissions from gasoline-fueled vehicles are negligible in comparison, thus are not included in the HRA. Fugitive PM2.5 emissions from road dust on Highway 101 will be estimated using U.S. EPA emission factors. Task 3 – Prepare Health Risk Assessment (HRA) Consultant will base the health risk assessment on the U.S. EPA four-step framework (hazard identification, dose-response assessment, exposure assessment and risk characterization). Consultant will use predictive modeling to estimate where the TAC emissions from a source might impact various locations. Consultant will conduct HRA modeling to determine the impacts from DPM on the project from exhaust from vehicles on Highway 101. Impacts from nearby industrial and institutional facilities will be determined using the BAAQMD stationary source tool. Consultant will prepare refined air dispersion modeling analyses using Atmospheric Dispersion Modeling System (AERMOD), the U.S. EPA’s guideline dispersion model for performing stationary source impact assessments. AERMOD is used to calculate pollutant concentrations at selected downwind receptor locations based on emission rates, exhaust parameters, terrain characteristics, and meteorological inputs. AERMOD is accepted by the BAAQMD to conduct air quality dispersion modeling analyses. Consultant will perform one set of AERMOD modeling runs. Consultant will use the results of the AERMOD air dispersion analysis as inputs into the HRA tool, along with pollutant-specific toxicity data, dose/response factors, and multi- ATTY/AGR.2023.020/Yorke Engineering, LLC (Bayfront Health Risk Assessment) (Page 11 of 14)