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<br />Legacy Sunflower Apartments Page 41 <br />Mitigated Negative Declaration – March 14, 2019 <br /> <br />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 /> <br />Typical emission rates from construction activities were obtained from CalEEMod Version 2016.3.2. <br />CalEEMod is a computer model published by the SCAQMD to estimate air pollutant emissions. The <br />CalEEMod 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 CalEEMod, 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 /> <br />SCAQMD’s Rule 403 <br /> <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 /> <br />Construction-Related Criteria Impacts <br /> <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 /> <br />Table 5 <br />Construction-Related Regional Pollutant Emissions <br /> <br />Activity Poll utant Emissions (pounds/day) <br />ROG NOx CO SO2 PM10 PM2.5 <br />Demolition <br />On-Site2 3.31 33.20 21.75 0.04 1.78 1.56 <br />Off-Site3 0.08 0.44 0.59 0.00 0.20 0.05 <br />Subtotal 3.39 33.65 22.35 0.04 1.98 1.61 <br />Site Preparation <br />On-Site2 1.50 15.54 8.69 0.01 3.24 2.05 <br />Off-Site3 0.08 0.05 0.59 0.00 0.20 0.05 <br />Subtotal 1.58 15.59 9.28 0.02 3.45 2.11 <br />Grading <br />On-Site2 2.43 26.39 16.05 0.03 3.91 2.50 <br />Off-Site3 1.81 62.69 16.91 0.17 4.29 1.31 <br />Subtotal 4.24 89.07 32.97 0.20 8.20 3.81 <br />Building <br />Construction <br />On-Site2 2.12 19.19 16.85 0.03 1.12 1.05 <br />Off-Site3 1.39 7.59 10.62 0.05 3.48 0.97 <br />Subtotal 3.51 26.78 27.47 0.07 4.60 2.02 <br />6-63