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Specifically, the number and length of vehicle trips is utilized to estimate the vehicle miles travelled ("VMT") <br />associated with construction. Then, utilizing vehicle -class specific EMFAC 2014 emission factors, CaIEEMod <br />calculates the vehicle exhaust, evaporative, and dust emissions resulting from construction -related VMT, <br />including personal vehicles for worker commuting.4 <br />Specifically, in order to calculate VMT, CaIEEMod multiplies the average daily trip rate by the average overall trip <br />length (see excerpt below): <br />"VMTd = F(Average Daily Trip Rate i * Average Overall Trip Length 1) n <br />Where: <br />n = Number of land uses being modeled."' <br />Furthermore, to calculate the on -road emissions associated with worker trips, CaIEEMod utilizes the following <br />equation (see excerpt below): <br />"EmisslonSpollutant = VMT * EFrunning,pollutant <br />Where: <br />Emissionspollutant = emissions from vehicle running for each pollutant <br />VMT = vehicle miles traveled <br />EFrunning,pollutant = emission factor for running emissions."' <br />Thus, there is a direct relationship between trip length and VMT, as well as a direct relationship between VMT <br />and vehicle running emissions. In other words, when the trip length is increased, the VMT and vehicle running <br />emissions increase as a result. Thus, vehicle running emissions can be reduced by decreasing the average overall <br />trip length, by way of a local hire requirement or otherwise. <br />Default Worker Trip Parameters and Potential Local Hire Requirements <br />As previously discussed, the number, length, and vehicle class of worker trips are utilized by CaIEEMod to <br />calculate emissions associated with the on -road vehicle trips required to transport workers to and from the <br />Project site during construction.' In order to understand how local hire requirements and associated worker trip <br />length reductions impact GHG emissions calculations, it is important to consider the CaIEEMod default worker <br />trip parameters. CalEEMod provides recommended default values based on site -specific information, such as <br />land use type, meteorological data, total lot acreage, project type and typical equipment associated with project <br />type. If more specific project information is known, the user can change the default values and input project - <br />specific values, but the California Environmental Quality Act ("CEQA") requires that such changes be justified by <br />substantial evidence.' The default number of construction -related worker trips is calculated by multiplying the <br />4 "Appendix A Calculation Details for CalEEMod." CAPCOA, October 2017, available at: http://www.agmd.gov/docs/default- <br />source/caleemod/02 appendix-a2016-3-2.pdf?sfvrsn=6, p. 14-15. <br />5 "Appendix A Calculation Details for CalEEMod." CAPCOA, October 2017, available at: http://www.agmd.gov/docs/default- <br />source/caleemod/02 appendix-a2016-3-2.pdf?sfvrsn=6, P. 23. <br />' "Appendix A Calculation Details for CalEEMod." CAPCOA, October 2017, available at: http://www.agmd.gov/docs/default- <br />source/caleemod/02 appendix-a2016-3-2.pdf?sfvrsn=6, p. 15. <br />7 "CalEEMod User's Guide." CAPCOA, November 2017, available at: http://www.agmd.gov/docs/default- <br />source/caleemod/01 user-39-s-guide2016-3-2 15november2017.pdf?sfvrsn=4, p. 34. <br />$ CalEEMod User Guide, available at: http://www.caleemod.com/, p. 1, 9. <br />2 <br />City Council 18 — 32 10/3/2023 <br />