3_Exhibit C_ADDENDUM ONLY - Laserfiche WebLink

City of Pleasanton—Stoneridge Mall Residential Project Section 15183 Checklist/15164 Addendum CEQA Checklist FirstCarbon Solutions 101 Https://adecinnovations.sharepoint.com/sites/PublicationsSite/Shared Documents/Publications/Client (PN-JN)/2148/21480017/Consistency Checklist/21480017 Stoneridge Mall Residential Project Checklist Addendum_Updated.docx required to adhere to seismic design standards from the CBC and General Plan policies which would reduce impacts to unstable soils or geologic units. Impacts would continue to be less than significant, and no mitigation is necessary, consistent with the Prior EIR. There are no proposed changes, new circumstances, or new information that would cause new or more severe impacts. Therefore, there are no environmental effects that are peculiar to the proposed project or the parcels on which the proposed project would be located. Impacts would be less than significant and the proposed project would not result in a new or more severe adverse impact that was not previously identified in the Prior EIR. d) Expansive Soils Prior EIR Conclusions The Prior EIR found that expansive soils can be in low-lying alluvial valleys such as the valley in which the City is located. General Plan Public Safety Element Programs 5.1, 5.2 and 5.3 require the preparation of site-specific soil studies, site-specific geotechnical engineering studies, and associated mitigation measures for future individual development projects. The Prior EIR outlines several practices to be implemented on sites with expansive soils. For example, weak soils that are re- engineered or replaced with engineered fill in accordance with CBC and Municipal Code requirements can minimize the effects of expansive soils on structures and residents. Furthermore, protections against expansive soils would also include the required incorporation of soil treatment programs (replacement, grouting, compaction, drainage control, etc.) in the design plans to address site-specific soil conditions. The design of the foundation support must conform to the analysis and implementation criteria described in the CBC, Chapters 16 and 18. Given adherence to the City’s codes and policies, the Prior EIR found that future individual development projects under the Housing Element would have the maximum practical protection available for potential inhabitants. Therefore, it was determined that impacts related to expansive soils would be less than significant. Analysis of Proposed Project As required by General Plan Public Safety Element Programs 5.1, 5.2, 5.3, and reiterated in the Prior EIR, a Geotechnical Engineering Report, including site-specific soil studies, site-specific geotechnical engineering studies, and mitigation measures, was prepared for the proposed project. The Geotechnical Engineering Report found expansive soils at the project site, which could result in movement and cracking in the proposed structures. Accordingly, the report contains several recommendations that would reduce the risks of expansive soils. These recommendations are included in this Checklist/Addendum as Measures to be Implemented in Compliance with the Prior EIR. It was concluded that implementation of measures recommended in the Geotechnical Engineering Report would not entirely prevent impacts related to expansive soils; however, it is noted that further impacts would be cosmetic and, therefore, would not create a risk to life or property. The Geotechnical Engineering Report also recommended that a further design-level geotechnical report be prepared, containing a design-level geotechnical analysis and recommendations to specifically reduce risks associated with expansive soils. This recommendation is also incorporated as Measures