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The Central Point Mixed Use Development Project - Santa, Ana, CA is close to roads with <br />moderate to high traffic (e.g., I-5, CA-55, lst Street, 41h Street, etc.). As a result of the <br />outdoor vehicle traffic noise, the Project site is likely to be a sound impacted site. <br />According to the Final Environmental Impact Report - Metro East Mixed Use Overlay <br />Zone, (EIP, 2007) the existing (as of 2007) roadway noise level in Table 4.9-4 ranges <br />from 54.7 to 73.8 dBA CNEL. As these noise levels were calculated more than 13 years <br />ago in 2007, the existing (as of 2020) roadway noise levels are likely higher. <br />As a result of the high outdoor noise levels, the current project will require a mechanical <br />supply of outdoor air ventilation to allow for a habitable interior environment with closed <br />windows and doors. Such a ventilation system would allow windows and doors to be kept <br />closed at the occupant's discretion to control exterior noise within building interiors. <br />PM2.5 Outdoor Concentrations Impact. An additional impact of the nearby motor <br />vehicle traffic associated with this project, are the outdoor concentrations of PM2.5. <br />According to the Final Environmental Impact Report - Metro East Mixed Use Overlay <br />Zone, (EIP, 2007) the Project is located in South Coast Air Basin, which is a State and <br />Federal non -attainment area for PM2.5. <br />An air quality analyses should to be conducted to determine the concentrations of PM2.5 in <br />the outdoor and indoor air that people inhale each day. This air quality analyses needs to <br />consider the cumulative impacts of the project related emissions, existing and projected <br />future emissions from local PM2.5 sources (e.g. stationary sources, motor vehicles, and <br />airport traffic) upon the outdoor air concentrations at the Project site. If the outdoor <br />concentrations are determined to exceed the California and National annual average PM2.5 <br />exceedence concentration of 12 µg/m3, or the National 24-hour average exceedence <br />concentration of 35 µg/m3, then the buildings need to have a mechanical supply of outdoor <br />air that has air filtration with sufficient removal efficiency, such that the indoor <br />concentrations of outdoor PM2.5 particles is less than the California and National PM2.5 <br />annual and 24-hour standards. <br />11 of 19 <br />