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City of Pleasanton Recycled Water Project CEQA Addendum Chapter 1 Introduction This Addendum assesses the environmental impacts of adding a new booster pump station to the City of Pleasanton's (City) proposed Recycled Water Project (Proposed Project). The City, as the lead agency under the California Environmental Quality Act (CEQA), will consider the potential incremental environmental impacts of the proposed booster pump station when it considers whether or not to approve this change to the Project. This Addendum is an informational document and is intended to be used by the City under Public Resources Code section 21166 and the related CEQA Guidelines, specifically sections 15162 through 15164.' The conclusion of this Addendum is that the proposed change will not result in new significant impacts, substantially increase the severity of previously disclosed impacts or involve any of the other conditions related to changed circumstances or new information that can require a subsequent or supplemental EIR under Public Resources Code section 21166 and CEQA Guidelines section 15162 beyond those impacts and conditions already identified in the City's Final Initial Study/Mitigated Negative Declaration (IS/MND) (SCH #2014062084) (also referred to as IS/MND throughout this document), which was certified and approved by the City on September 16, 2014. As discussed in this Addendum, CEQA and the CEQA Guidelines do not require a subsequent or supplemental negative declaration or environmental impact report for the proposed Project change. 1.1 California Environmental Quality Act (CEQA) For a proposed modified project, State CEQA Guidelines (Sections 15162 and 15164) provide that an Addendum to an adopted IS/MND may be prepared if only minor technical changes or additions are necessary or none of the following conditions calling for the preparation of a subsequent IS/MND have occurred: • Substantial changes in the project which require major revisions to the IS/MND due to the involvement of new significant environmental effects or a substantial increase in the severity of previously identified significant effects; • Substantial changes with respect to the circumstances under which the project is undertaken which require major revisions to the IS/MND due to the involvement of new significant environmental effects or a substantial increase in the severity of previously identified significant effects; or • New information of substantial importance, which was not known and could not have been known with the exercise of reasonable diligence at the time of IS/MND adoption, shows any of the following: i) The project will have one or more significant effects not discussed in the IS/MND, ii) The project will result in impacts substantially more severe than those disclosed in the IS/MND, iii) Mitigation measures or alternatives previously found not to be feasible would in fact be feasible and would substantially reduce one or more significant effects of the project, but the project proponent declines to adopt the mitigation measure or alternative, or ' The CEQA Guidelines are contained in Title 14 of the California Code of Regulations. April 2018 1-1