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City of Santa Ana <br />Environmental Checklist <br />As indicated in Table 3 -6, implementation of Mitigation Measures AQ -1, AQ -2, and AQ -3 would result <br />in reductions of all criteria pollutant emissions, most notably of ROG by 89% and NOx emissions by <br />74% for the worst -case scenarios in Phase i, and a reduction of ROG by 89% in the worst -case <br />scenario in Phase 11. Implementation of these mitigation measures would reduce emissions of ROG <br />and NOx below the SCAQMD significance threshold. As such, air quality emission impacts related to <br />construction would be less than significant after implementation of Mitigation Measures AQ -1 <br />through AQ -3. <br />Table 3 -6. Estimate of Regional Construction Emissions (pounds per day) After Implementation of <br />Mitigation <br />Regional Construction Emissions ROG NOx CO SOx PM10 PM2.5 <br />Phase I <br />Excavation & Soils import and Rough Grading & <br />Bldg Pad Prep 2012 <br />Fine Grading, Bldg Construction & Architectural <br />Finishing 2013 <br />Phase 1I <br />Fine Grading, Bldg Construction & Architectural <br />Finishing 2019 <br />SCAQMD Regional Threshold (5 & 2 acres) <br />Exceed 'threshold? <br />Notes: <br />9 88 57 <1 19 4 <br />24 83 66 <1 18 5 <br />10 36 40 <1 12 2 <br />75 100 550 150 150 55 <br />No No No No No No <br />Construction emission calculation worksheets are included in Appendix A. <br />a PM10 emissions estimates take into account compliance with SCAQMD Rule 403 requirements <br />for fugitive dust suppression, which require that no visible dust be present beyond the site <br />boundaries, as well as the use of EPA Tier 2 equipment. <br />b Implementation of Excavation & Soils Import and Rough Grading & Bldg Pad Prep 2012 and <br />Fine Grading, Bldg Construction, Asphalt Parking Lots & Architectural Finishing 2013 within <br />Phase 1 have the potential to overlap, thus emissions are summed. <br />Implementation of Fine Grading, Bldg Construction & Architectural Finishing 2019 within <br />Phase II have the potential to overlap, thus emissions are summed. <br />Source: ICF 2012. <br />Mitigation Measure AQ -1: During construction of Phase 1, the excavation and soils import and <br />rough grading and soil prep components will be extended from 2 days to 4 days, and that the <br />maximum number of truck trips for export of soil /excavation material be reduced to a maximum of <br />90 trips per day. These limitations shall be specified in the final grading permits and bid <br />specifications to be approved by the City of Santa Ana Planning and Building Agency prior to <br />issuance of a grading permit. Adherence to these requirements would thereby reduce the daily <br />intensity and NOx emissions of Phase I associated with the excavation and soils import component. <br />Mitigation Measure AQ -2: During all construction phases, construction- related equipment, <br />including heavy -duty equipment, motor vehicles, and portable equipment, will be turned off when <br />not in use for more than 5 minutes. These requirements shall be specified in the final grading <br />permits and bid specifications to be approved by the City of Santa Ana Planning and Building Agency <br />prior to issuance of a grading permit. <br />I he Acaoemy Charter High School 3 23 June 2012 <br />Initial Study /Mitigated Negative Declaration ICF 00914.11 <br />