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SANTA ANA REZONE PROJECT <br />INITIAL STUDY/MITIGATED NEGATIVE DECLARATION <br />As shown in Table 3, project construction emission would not exceed the SCAQMD's most stringent <br />LSTs and would not be expected to result in concentrations that could exceed ambient air quality <br />standards or contribute substantially to an existing exceedance of an ambient air quality standard. <br />Impacts relating to localized construction emissions would be less than significant. <br />Localized Operation Analysis <br />Similar to the construction LST analysis above, the applicable operational LSTs were obtained for a <br />project located in State Responsibility Aea (SRA) 17 with the nearest sensitive receptor being 50 <br />meters away. Long-term operations for the proposed project would occur on the 3.43-acre project <br />site. The LST screening levels only provide thresholds for 1-acre, 2-acre, or 5-acre sites. Therefore, <br />for conservative analysis, the LST thresholds for a 2-acre site are used to determine project impacts. <br />Table 4 presents the proposed project's maximum daily on -site emissions compared with the <br />appropriate LSTs. <br />Table 4: Operation Localized Significance Screening Analysis <br />Activity <br />Maximum Daily Operation Emissions <br />Localized Significance Thresholds <br />(SRA 17, 2-acre site, 50 meter distance to receptor) <br />Exceeds Threshold? <br />Notes: <br />NOx = oxides of nitrogen <br />CO = carbon monoxide <br />PM10 = particulate matter less than 10 microns in diameter <br />PM2.5 = particulate matter less than 2.5 microns in diameter <br />On -site Emissions (pounds per day) <br />NOx CO PM10 PM2.5 <br />29.69 23.61 4.44 1.15 <br />114 1041 5 2 <br />No No No No <br />Source of emissions: Appendix A. <br />Source of thresholds: SCAQMD Mass Rate Lookup Tables for 2-acre site in Source Receptor Area 17 for sensitive receptors <br />located 50 meters from the project site. <br />As shown in Table 3, project operation emissions would not exceed the SCAQMD's LSTs and would <br />not be expected to result in concentrations that could exceed ambient air quality standards or <br />contribute substantially to an existing exceedance of an ambient air quality standard. Impacts relating <br />to localized operation emissions would be less than significant. <br />Project CO Hotspot Assessment <br />An adverse CO concentration, known as a hotspot, would occur if an exceedance of the State 1-hour <br />standard of 20 parts per million (ppm) or the 8-hour standard of 9 ppm were to occur. CO emissions <br />are a function of vehicle idling time, meteorological conditions, and traffic flow. Under certain extreme <br />34 FCS <br />Https://adecinnovaticns.sharepoint.com/sites/PubiicationsSite/Shared Documents/Publications/Client(PN-JN)/0327/03270047/ISMND/03270047 Santa Ana Rezone Project ISMND.docx <br />