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6 be used on site for a portion of the total building construction duration” and “MM: limit crane use” (Appendix A, pp. 83, 105). Furthermore, the AQ & GHG Report provides the following off‐road construction equipment assumptions (see excerpt below) (Appendix A, pp. 63): However, these changes remain unsupported for two reasons. First, the Checklist fails to mention or justify the revised off‐road construction equipment usage hours whatsoever. Second, the AQ & GHG Analysis cannot simply assume that cranes would be used for fewer than 354 hours or that welders would be predominately used during the initial framing phase. According to the CalEEMod User’s Guide: “CalEEMod was also designed to allow the user to change the defaults to reflect site‐ or project‐ specific information, when available, provided that the information is supported by substantial evidence as required by CEQA” (emphasis added).9 Here, as the Checklist fails to mention the changes and the AQ & GHG Report fails to provide substantial evidence to support the revised off‐road construction equipment usage hours, we cannot verify the changes. By including unsubstantiated changes to the default off‐road construction equipment usage hours, the models may underestimate the Project’s construction‐related emissions and may constitute an impact that more severe than was analyzed in the General Plan EIR or the Checklist. Unsubstantiated Changes to Fleet Mix Percentages Review of the CalEEMod output files demonstrates that the “Callan and E 14th Street Infill Checklist Project Operations” model includes several changes to the default operational vehicle fleet mix percentages (see excerpt below) (Appendix A, pp. 130‐131). 9 CalEEMod Model 2013.2.2 User’s Guide, available at: http://www.aqmd.gov/docs/default‐ source/caleemod/usersguideSept2016.pdf?sfvrsn=6, p. 12. 121