Item 27 - Appeal Application Nos. 2020-03 and 2020-04 - Central Pointe Mixed-Use Development

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Parking with Elevator." We adjusted the default CalEEMod trip rates to reflect the average number of daily trips estimated by the TIA and left all other values as default. In order to conduct our screening -level risk assessment we relied upon AERSCREEN, which is a screening level air quality dispersion model.10 The model replaced SCREEN3, and AERSCREEN is included in the OEHHA11 and the California Air Pollution Control Officers Associated ("CAPCOA")12 guidance as the appropriate air dispersion model for Level 2 health risk screening assessments ("HRSAs"). A Level 2 HRSA utilizes a limited amount of site -specific information to generate maximum reasonable downwind concentrations of air contaminants to which nearby sensitive receptors may be exposed. If an unacceptable air quality hazard is determined to be possible using AERSCREEN, a more refined modeling approach is required prior to approval of the Project. We prepared a preliminary HRA to quantify the Project's construction -related and operational health risk impacts posed to nearby residential receptors using the annual PM10 exhaust estimates from the SWAPE CalEEMod output files. Consistent with recommendations set forth by OEHHA, we assumed residential exposure begins during the third trimester stage of life. SWAPE's CaIEEMod model indicates that construction activities will generate approximately 263 pounds of DPM over the default 447-day construction period. The AERSCREEN model relies on a continuous average emission rate to simulate maximum downward concentrations from point, area, and volume emission sources. To account for the variability in equipment usage and truck trips over Project construction, we calculated an average DPM emission rate by the following equation: grams 263.4 lbs 453.6 grams 1 day 1 hour Emission Rate (second) = x x x = 0.003094 g/s second 447 days lbs 24 hours 3,600 seconds Using this equation, we estimated a construction emission rate of 0.003094 grams per second ("g/s"). Subtracting the 447-day construction period from the total residential duration of 30 years, we assumed that after Project construction, the sensitive receptor would be exposed to the Project's operational DPM for an additional 28.78 years, approximately. SWAPE's operational CalEEMod emissions indicate that operational activities will generate approximately 1,443 pounds of DPM per year throughout operation. Applying the same equation used to estimate the construction DPM rate, we estimated the following emission rate for Project operation: grams 1,365 days lbs 443 lbs 453.6 grams 1 day 1 hour Emission Rate (second ) = x 24 hours 3,600 seconds x x = 0.02075 g/s Using this equation, we estimated an operational emission rate of 0.02075 g/s. Construction and operational activity was simulated as an 8.03-acre rectangular area source in AERSCREEN with 10 U.S. EPA (April 2011) AERSCREEN Released as the EPA Recommended Screening Model, htto://www.eoa.eov/ttn/scram/euidance/clarification/20110411 AERSCREEN Release Memo.odf 11 "Risk Assessment Guidelines Guidance Manual for Preparation of Health Risk Assessments." OEHHA, February 2015, available at: http://oehha.ca.gov/air/hot spots/2015/2015GuidanceManual.pdf 12 CAPCOA (July 2009) Health Risk Assessments for Proposed Land Use Projects, http://www.capcoa.org/wp- content/uploads/2012/03/CAPCOA HRA LU Guidelines 8-6-09.pdf. p]