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excavation for the first level of the subterranean parking structure and the construction of the apartment <br />building, parking structure and required site improvements. <br />Typical emission rates from construction activities were obtained from CaIEEMod Version 2016.3.2. <br />CaIEEMod is a computer model published by the SCAQMD to estimate air pollutant emissions. The <br />CaIEEMod program uses the EMFAC2014 computer program to calculate the emission rates specific <br />for Orange County for construction -related employee vehicle trips and the OFFROAD2011 computer <br />program to calculate emission rates for heavy truck operations. EMFAC2014 and OFFROAD2011 are <br />computer programs generated by CARB that calculate composite emission rates for vehicles. For the <br />proposed project the CaIEEMod, calculated the peak daily air pollutant emissions and the highest level <br />of emissions for each of the construction phases in terms of air pollutant emissions. <br />SCAQMD's Rule 403 <br />The project would be required to comply with SCAQMD rules to reduce fugitive dust emissions during <br />project construction and the life of the project. Project compliance with Rule 403 is achieved through <br />the application of standard best management practices during construction and operation activities, <br />which include the application of water or chemical stabilizers to disturbed soils, manage haul road dust <br />by the use of water, cover haul vehicles, restrict vehicle speeds on on -site unpaved roads to 15 mph, <br />sweep loose dirt from paved site access roadways, stop construction activity when wind speeds exceed <br />25 mph and establish a permanent ground cover on finished areas. <br />Construction -Related Criteria Impacts <br />The construction -related criteria pollutant emissions for each construction phase are shown in Table 5. <br />As shown, none of the project's construction emissions would exceed regional thresholds. Therefore, <br />project construction emissions would be less than significant. <br />Table 5 <br />Construction -Related Regional Pollutant Emissions <br />Activity <br />Pollutant <br />Emissions (pounds/day) <br />ROG <br />NOx <br />CO <br />S02 <br />PM10 <br />PM2.5 <br />On-Site2 <br />3.31 <br />33.20 <br />21.75 <br />0.04 <br />1.78 <br />1.56 <br />Demolition <br />Off -Site' <br />0.08 <br />0.44 <br />0.59 <br />0.00 <br />0.20 <br />0.05 <br />Subtotal <br />3.39 <br />33.65 <br />22.35 <br />0.04 <br />1.98 <br />1.61 <br />On-Sitez <br />1.50 <br />15.54 <br />8.69 <br />0.01 <br />3.24 <br />2.05 <br />Site Preparation <br />Off -Site' <br />0.08 <br />0.05 <br />1 0.59 <br />0.00 <br />1 0.20 <br />0.05 <br />Subtotal <br />1.58 <br />15.59 <br />9.28 <br />0.02 <br />3.45 <br />2.11 <br />On-Site2 <br />2.43 <br />26.39 <br />16.05 <br />0.03 <br />3.91 <br />2.50 <br />Grading <br />Off -Site' <br />1.81 <br />62.69 <br />16.91 <br />0.17 <br />4.29 <br />1.31 <br />Subtotal <br />4.24 <br />89.07 <br />32.97 <br />0.20 <br />8.20 <br />3.81 <br />On-Site2 <br />2.12 <br />19.19 <br />16.85 <br />0.03 <br />1.12 <br />1.05 <br />Building <br />Construction <br />Off -Site' <br />1.39 <br />7.59 <br />10.62 <br />0.05 <br />3.48 <br />0.97 <br />Subtotal <br />3.51 <br />26.78 <br />27.47 <br />0.07 <br />4.60 <br />2.02 <br />Legacy Sunflower Apartments Page 41 <br />Mitigated Negative Declaration - March 14, 2019 <br />