AgdaPkt 2012-10-08 - Laserfiche WebLink

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6.1.B. - Page 14 anticipated to be t#�e primary TACs of concern. Consequently, the health risk assessment (HRA} will focus on DPM impacts from construction-related acti�ities, The methods used in t�e analysis of DPM emissions and health impacts from project-related constructian emissio�s will be cons�stent with the BAAQMD CEQA Air Quality Guideiines (May 2012) and also in accordance with #he California En�ironmental Pratection (CaIEPA)1 and United States Environmental Protectior� Agency (USEPA) risk assessment guidance. The HRA will incorporate consistent methado[ogies and assumptions fior#he following aspects: �) The estimation of DPM emissions; 2) The calculation o#airborne DPM concenfrations at local receptor locations; and 3) The estimation of excess lifetime cancer risks and non-�ancer health hazard indices (Hls} at the receptor locations. DPM emissions from the construction equipment associated wi#f� fhe praject construction activities wilf be �stima�ed based an construction site locations, construction scheduling and timelines, and equipment type/use intensity data provided to the City by the project applicant. Construction acti�ities considered in this HRA include project-related demolitior�, grading, excavation, infrastructure installatian and foundation and structure cans#ructian. Construction sources of DPM wiil include off-road construction equipment (e.g., cranes, loaders, , excavators, dozers, graders, etc.) and canstructian-related motor vehicle traffic, the latter including: �� Equipmer�t and material delivery trucks; � Spoils and debris haulir�g trucks; and • Canstruction employees commute vehicles. Airborne DPM concent�ations will be estimated at lacal sensitive receptors using tFte DPM emissions estima#es and the AERMOD air dispersion model, or �ther appropriate methodology based on consultatior� with BAAQMD. For the purposes af the constructiot�-related HRA, there is anly one sensiti�e receptor, th� Summit Preparatory Charter High Schaol, within 1,OQ0 feet of the praject site. The high school, located approximately 320 feet fram the project site, would be the focus of the constructian relat�d impact evaluation. Based on the results of the emission estimates and air dispersion modeling, quantita#ive estimates wi�l be made vf excess lifefime cancer risks and non-cancer Hls associa#ed with potential exposure to DPM tha# may be emitted durir�g construction activities related to the P�oject. The toxicity values used ta �stimate excess life#ime cancer risks and non-cancer H!s will be consistent with guidance from BAAQMD, CaI/EPA, and USEPA. 1 Office of Environmental Health Hazard Assessment, Air Toxics Hot Spots Program Risk Assessment Guidelines: The Air Toxres Hot Spots Program Cuidance Manua! for Preparation of Health Risk Assessments(2003). ATTY/AGR12012.154/24 H011R CONTRACT 1 ATKINS IVORTH AMERICA REV:09-19-12 JS Page 92 of 2B