05 - Laserfiche WebLink

\ i FIRSTCARBON Proposal S0LUTI0 \S Construction-Related Health Risk Assessment Based on the area of land to be disturbed, land uses developed, and proximity to sensitive receptors, FCS anticipates that a construction-related Health Risk Assessment(HRA)will be necessary to evaluate the project's construction-related toxic air contaminant (TAC)emissions. FCS will be prepare a construction HRA based on the recommended BAAQMD's Health Risk Assessment Guidelines (HRA Guidelines) (BAAQMD 2016)and Office of Environmental Health Hazard Assessment's(OEHHA) Risk Assessment Guidelines (OEHHA 2015).The following tasks will be required for the construction HRA: FCS will perform the following tasks as part of this analysis. o Define what a sensitive receptor is and identify nearby sensitive receptors. o Identify health risk standards and acceptable cancer and acute and chronic non-cancer risk thresholds from diesel emissions that are detailed in BAAQMD's thresholds of significance. o The following subtasks will be utilized to perform the construction-related HRA: - Calculate the on-site construction equipment diesel equipment PM25 and total organic gases emissions rates that were calculated in the Air Quality Analysis prepared for the proposed project. - Calculate the daily construction truck trip estimates used in the Air Quality Analysis and calculate each truck trip's PM25 emissions rates through use of the EMFAC2014 model. - Model the diesel PM2.5 concentrations at representative nearby sensitive receptors associated with the on-site construction equipment and off-site truck emissions up to 1,000 feet from the project site through utilization of the ISCST3 model,the emissions rates provided in the previous steps and the methodology described in the HRA Guidelines. - Utilize the prior subtask's calculated toxic air emission levels,to calculate the cancer risk and the chronic and acute non-cancer health impacts at the nearby sensitive receptors from the proposed construction site. The results of the HRA will be incorporated in the EIR,while detailed methodology, assumptions, and other technical modeling data will be included in the appendix of the EIR. Significance Findings/Mitigation Measures FCS will make a significance finding before and after mitigation for potential impacts. If the project exceeds criteria pollutant or GHG thresholds of significance, FCS will identify mitigation measures that would reduce criteria pollutants and/or GHG emissions to a less-than-significant level. When possible, mitigation measures will be quantified for their emission reduction potentials using, but not limited to CaIEEMod's mitigation component,California Air Pollution Control Officer Association (CAPCOA) guidance, and BAAQMD guidance. Any design features and mitigation measures included in the project will be discussed in the analysis. NORTH AMERICA I EUROPE I AFRICA I AUSTRALIA I ASIA 7 FIRSTCARBONSOLUTIONS.COM