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2 <br /> <br />meteorological data, total lot acreage, project type and typical equipment associated with project type. <br />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 <br />justified by substantial evidence.2 Once all of the values are inputted into the model, the Project's <br />construction and operational emissions are calculated, and "output files" are generated. These output <br />files disclose to the reader what parameters were utilized in calculating the Project's air pollutant <br />emissions and make known which default values were changed as well as provide justification for the <br />values selected.3 <br />Review of the Project’s air modeling demonstrates that the DEIR underestimates emissions associated <br />with Project activities. As previously stated, the DEIR’s air quality analysis relies on air pollutant <br />emissions calculated using CalEEMod. When we reviewed the Project’s CalEEMod output files, provided <br />in Appendix B to the DEIR, we found that several of the values inputted into the model were not <br />consistent with information disclosed in the DEIR. As a result, the Project’s construction and operational <br />emissions are underestimated. An updated EIR should be prepared to include an updated air quality <br />analysis that adequately evaluates the impacts that construction and operation of the Project will have <br />on local and regional air quality. <br />Unsubstantiated Changes to Vehicle Emission Factors <br />The vehicle emission factors used to estimate the proposed Project’s operational emissions were <br />changed from the CalEEMod default values without proper justification. As a result, the model should <br />not be relied upon to determine Project significance. <br />According to the Project’s CalEEMod output files, 1,185 of the vehicle emission factors were manually <br />changed from their default values (Appendix B, pp. 114-158, 196-240, 277-321, 338-382). As previously <br />stated, the CalEEMod User Guide requires that any non-default values inputted must be justified.4 <br />According to the “User Entered Comments & Non-Default Data” table, the justification provided for <br />these changes is: “EMFAC2017” (Appendix B, pp. 110, 193, 277, 338). However, EMFAC2017 refers to an <br />entire database, not a specific set of vehicle emission factors or calculations. The “User Entered <br />Comments & Non-Default Data” table or the DEIR should have specified which input parameters were <br />used to obtain the vehicle emission factors inputted in the model. As a result, we cannot verify these <br />values, and the model should not be relied upon to determine Project significance. <br />Use of Incorrect Trip Purpose Percentages in Proposed Land Use Model <br />Review of the Project’s CalEEMod output files demonstrates that the pass-by trip percentages utilized in <br />the model are inconsistent with the pass-by trip percentages indicated by the Traffic Impact Analysis <br />(TIA), provided as Appendix K to the DEIR. As a result, the model underestimates the Project’s <br />operational emissions. <br /> <br />2 Ibid, p. 1, 9. <br />3 Supra, fn 1, p. 11, 12 – 13. A key feature of the CalEEMod program is the “remarks” feature, where the user <br />explains why a default setting was replaced by a “user defined” value. These remarks are included in the report. <br />4 Supra, fn 1, p. 7, 13.