Laserfiche WebLink
SANTA ANA REZONE PROJECT <br /> INITIAL STUDYIMITIGATED NEGATIVE DECLARATION <br /> Quality Standards (CAAQS). To minimize efforts, the SCAQMD developed mass rate lookup tables as <br /> a simple screening procedure. If a project's on-site emissions do not exceed the screening levels for <br /> any pollutant, it can be concluded that the project would not cause or contribute to an adverse <br /> localized air quality impact. Screening levels are provided for various distances (i.e., 82 feet[25 <br /> meters], 164 feet[50 meters], 328 feet[100 meters], 656 feet[200 meters], and 1,640 feet[500 <br /> meters]) between the project boundary and the nearest sensitive receptor and various project site <br /> acreages (i.e., 1, 2, and 5 acres).As discussed above, the closest sensitive receptors are 160 feet, or <br /> approximately 50 meters, south of the project site. <br /> The LST Methodology only applies to on-site emissions and states that"off-site mobile emissions <br /> from the project should not be included in the emissions compared to LSTS." However, if a project's <br /> overall emissions (i.e., including off-site mobile emissions) are below the LSTS, then the proposed <br /> project's on-site impacts would also fall below the LSTS. For streamlined yet conservative analysis <br /> purposes, and given the proposed project's minimal construction and operation emissions, the <br /> proposed project's overall emissions are compared to the LSTs. <br /> Localized Construction Analysis <br /> Although the project site is 3.43 acres, the proposed project would only actively disturb fewer acres a <br /> day during construction phases. Therefore, the LST screening thresholds for 1 acre were utilized for <br /> the LST analysis,which are the most stringent screening thresholds. The LSTS have been obtained <br /> from the LST Methodology for 1-acre project sites located in Source ReceptorArea 17, Central <br /> Orange County. <br /> Table 3 presents the proposed project's maximum daily on-site emissions compared with the <br /> applicable LSTS. <br /> Table 3: Construction Localized Significance Screening Analysis <br /> On-site Emissions(pounds per day) <br /> Activity NOx CO PMto PM2.6 <br /> Maximum Daily Construction Emissions 29.69 23.61 8.76 2.33 <br /> Localized Significance Thresholds <br /> (SRA 17, 1-acre site, 50 meter distance to receptor) 83 173 12 4 <br /> Exceeds Threshold? No No No No <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 /> SRA=State Responsibility Area <br /> Source of emissions:Appendix A. <br /> Source of thresholds:SCAQMD Mass Rate Lookup Tables for 1-acre site in Source Receptor Area 17 for sensitive receptors <br /> located 50 meters from the project site. <br /> FCS �t��j�7 33 <br /> Https:J/adecinnovatians.sharepaintcomJsites/Puhlicatians3ilef5hared❑ocuments/Publieati ons/Client(PN.JN)/0327/0327OC47/ISMNO/03270W47 Saaa Ana Rezone Pn.QrdlA.swce No. NS-3092 <br /> Page 45 of 118 <br />