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4th and Mortimer CEQA Addendum <br />October 12, 2020 <br />Page 14 of 15 <br />the still pending decisionmaking process." Id., 1 Cal.5th at 951-52. The agency must <br />"decide under CEQA's subsequent review provisions whether project changes will require <br />major revisions to the original environmental document because of the involvement of <br />new, previously unconsidered significant environmental effects." Id., 1 Cal.5th at 952. <br />Section 21166 and CEQA Guidelines § 15162 "do[] not permit agencies to avoid their <br />obligation to prepare subsequent or supplemental EIRs to address new, and previously <br />unstudied, potentially significant environmental effects." Id., 1 Cal.5th at 958. <br />The evidence indicates that the project considered by the 2010 EIR has undergone <br />significant changes to the project and its circumstances requiring substantial revisions to <br />that 10-year old EIR. <br />A. A New EIR is Required Because the Increase in Massing and Density is a <br />Substantial Change from the 2010 Project and there is Substantial <br />Evidence that the Project Will Result in Emissions of Formaldehyde to the <br />Air that Will Have a Significant Health Impact on Future Residents. <br />Even if the 201 EIR were somehow relevant to the current Project, the City would <br />still be required to prepare an SEIR. The increase in massing and density, the failure to <br />conduct a historic resource analysis, and zoning changes and variances required as part <br />of the Project is a substantial change from the 2010 project. "The purpose behind the <br />requirement of a subsequent or supplemental EIR or negative declaration is to explore <br />environmental impacts not considered in the original environmental document." Friends <br />of College of San Mateo Gardens v. San Mateo (2016) 1 Cal.5th 937, 949 (quoting Save <br />Our Neighborhood v. Lishman (2006) 140 Cal.AppAth 1288, 1296). For example, in the <br />case of Ventura Foothill Neighbors, a mere increase in the height of a building by 15 feet <br />required a supplemental EIR, not an addendum. Ventura Foothill Neighbors v. Cty. of <br />Ventura, 232 Cal. App. 4th 429 (2014). <br />As discussed above, the expert opinion of Mr. Offermann constitutes substantial <br />evidence that the residential component of the Project will result in a significant air quality <br />impact to residential occupants of the Project. This impact is significant and new. It could <br />not have been known in 2010 because the science in this area did not exist until 2015. <br />Accordingly, the City violated CEQA by not preparing an SEIR to analyze and mitigate <br />this new significant impact. <br />There is no substantial evidence in the record to support a conclusion that the <br />Project will not have a new significant indoor air quality impact as a result of significant <br />changes to the Project when compared to the project analyzed in the 2010 EIR. <br />Accordingly, the City's decision to prepare an Addendum rather than an SEIR is not <br />supported by substantial evidence, and approval of the Project based on the Addendum <br />would constitute an abuse of discretion. <br />For the above and other reasons, the Planning Commission should decline to <br />recommend the City Council approve the Addendum, and instead direct Planning Staff to <br />75C-33 <br />