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ENViROVbXNTM.. IMPADT.;ASPOET ADDENDUM <br />-SEPTZMUEE-]411 <br />AUMSTRON0 HANON REVISEDPROJECT <br />SANTA ANA. 'CALIFORNIA <br />Cer ified EIR,alse'concluded thakthc',Approved Project would not conflict with an AQ1vIP. <br />'Therefore, the Revised Project ivoWd not result in new signiticant impacts beyond those <br />identified in the Certified EIR. No new,mitigation measures ore required <br />li) Similar to the Approved Project, air quality iutpacts could,occucdur]hg construction oftlie <br />Rc*cd Project froin'soil disturbance and equipment exltaustl Major sources of emissions during <br />'grading and site preparation include (I) exhaust emissions from. construction vehiclesi <br />'(2) equippienFand fugitive dust generated by construction vehicles and' equipment traveling over <br />exposed surfaces, iind '(3) soil disturbances from grading and backfilling. Construction emissions <br />from the Revised Project the potential to excccd criteria pollutantthreshokkestablished by <br />SCAQMD. However, the [Revised Project would comply, w' ith MitigationMeasures AQ -1 and <br />AQ -2 from the Cerlieted EIR, which require adherence to standard SCAQMD standard measures <br />to reduceairquality impacts, as well as SCAQfvID Rules.402'and 403 to reduce fugitive dust <br />during construction. Mitigati&i Measures 41.and AQ4 would reduce short-tetin air quality <br />impacts associated with.the Revised Project,;Due to increased emission regulations on <br />construction equipment, emissions associated with construction'orthe Revised Project are <br />expected to -be lower than those identified for the Approved` Project. T1te,Cerlifled EIR identified <br />construction nitrogen oxide (NW) emissions :is stgnificatit".ind unavoidable. Implementation yr <br />the Project.would use a construction fleahthat.would'piadney I o�tile NOx etnissiolts than thiisa <br />identified in the, Certified EIR. Therefore; the Approved Project is not expyoled to result in new or <br />worsening air 11uality impacts. No.new, mitigatimi measure$ are.required. <br />Similar to the.Approved Project, long-term ainemission impacts <are associated with ;mychange. <br />in permanent use of the P.rojecr site,liy on=site siationar5' and oft=site mobile sources that <br />substantially increase emissions, Stationary -source emissions incln(le lnissions associated with <br />electncity consurn tion olid natural gas usage., Mobile -source emissions usually result from <br />vehicle trips associated,with o project. t is anticipated thatstanon try sources of the Revised <br />Project would be similar to the, Approved Project. As discussed in.Section 2:15,. <br />'TransportationoTraffic, the Revised Project'woutilgencrate:fewer traffic trips compared to the <br />land uses proposed for the Approved Project; therefore, air quality impacts of the Revised'Project <br />rf6ii mobile sources would be loss, than the Approved Project: The Certified EIR concluded that <br />operational t,it,quahtI; emissions would not exceed SbAQmlI thresholds and wouldbe:lessthan <br />silniiflcanr. Therefore, :it is anhcipalcd dta[ operllional air quality impacts of the Revised Project <br />would also not exceed SCAQMD diresholds and would be'less than. significant. <br />In summary, short and long-term airquolily impacts would be'sitnilar or less than those <br />identified in the Certified E1R. Therefore, the Revised Project would not result in new'significant <br />impacts beyond those identified in the Certified FIR. No new mitigation measures aie'required.. <br />c) The'Basin is in notiattainment for the federal and State standards for ozone (fir) and particulate <br />matter less th;in'2.5 micrdns in size (PMi,5). In addition, the Basin is in non mainment for the, <br />State particulate hiatter less than 10 mnsize microns i(P[vho) standard, and atelintnent/maintenanee <br />for the federal PMI.,; carbonmonoxide (LO), and nitrogen dioxide'(N0,) standards. <br />:As discussed in Reponse 2.3.b, above; construcliori activities have the potential to exceed the <br />SCAQMQ'scriteria pollutant emission tlimsholdc, However, the projected to ilssions of criteria <br />pollutants resulting during construction of the Revised Project would similar to or less than those <br />Pii5lIU16iV?AdAm3om�tddendirtn:dnex <br />75B-66 <br />