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SANTA ANA REZONE PROJECT <br /> INITIAL STUDYIMITIGATED 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 /> On-site Emissions(pounds per day) <br /> Activity NOx CO PM10 PM2.5 <br /> Maximum Daily Operation Emissions 29.69 23.61 4.44 1.15 <br /> Localized Significance Thresholds <br /> 114 1041 5 2 <br /> (SRA 17, 2-acre site, 50 meter distance to receptor) <br /> Exceeds Threshold? No No No No <br /> Notes: <br /> NOx=oxides of nitrogen <br /> CO=carbon monoxide <br /> PM,p=particulate matter less than 10 microns in diameter <br /> PM2,5=particulate matter less than 2.5 microns in diameter <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 FC5 <br /> Ordinance No. N4—.J pdi ,ations.Sharepolnt.com/SiteS/PutliCdti..sSite/SharMD.cumenls/Pub1[cations/CiientIPN-JN�/03 2 7/03 27004 7/lSk4ND/03270W7Sa,t,Ana R...ne Project ISMND.doa <br /> Page 46 of 118 <br />