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Veterans Memorial Senior Center/YMCA Project 18 Addendum #2 City of Redwood City November 2025 Geology and Soils, Hydrology and Water Quality The certified 2019 EIR found that the ground disturbances resulting from construction activity associated with the original project would result in a temporary increase in the potential for erosion and sedimentation to be carried off-site by runoff. These hydrological and water quality impacts would be reduced to a less significant level with adherence to the requirements in the Construction General Permit, including the development of a Storm Water Pollution Prevention Plan, and the Municipal Regional Stormwater NPDES Permit.17 In addition, the 2019 EIR found that construction activities may result in geology and soil impacts related to wind or water-related erosion and loss of topsoil. The 2019 EIR concluded that implementation of the erosion control measures included in the Municipal Regional Stormwater NPDES Permit would reduce these impacts to a less than significant level. The 2019 EIR also concluded that potential impacts related to liquefaction, landslide, lateral spreading, and expansive soils would be reduced to a less than significant level with adherence to the requirements of the California Building Code (CBC) and implementation of recommendations in the design-level geotechnical investigation for the original project.18 The 2022 Addendum determined that the changes to the off-site traffic calming improvements would not result in any new significant impacts or substantially more severe impacts to geology and soils or hydrology and water quality since the same requirements and permit conditions would be implemented.19 The geological conditions on-site have not changed substantially since certification of the 2019 EIR. Like the original project, the modified project would be constructed consistent with the requirements of the CBC and would implement structural recommendations in the design-level geotechnical investigation that is required by the City prior to issuance of building permits. The modified project would no longer include the Valota Road driveway, therefore, the modified project would result in a smaller area of disturbed ground compared to the original project. This modification would also result in the preservation of additional pervious area in the park that was previously going to be replaced with the new driveway under the original project. The modified project would involve an increased amount of excavation and off-hauling of soil compared to what was assumed in the original project; however, these activities would occur in areas that were already going to be disturbed during construction of the building and swimming pool so there are no new areas that would be disturbed under the modified project other than those previously anticipated and evaluated in the 2019 EIR. In addition, the modified project would comply with all requirements in the Construction General Permit and Municipal Regional Stormwater NPDES Permit, including the stormwater treatment control measures included in these permits to reduce any adverse effects of construction-related storm water discharges. Based on this discussion, the proposed modifications would not result in any new significant impacts or more significant geology and soils and hydrology and water quality impacts than those analyzed and disclosed in the 2019 EIR or 2022 Addendum. 17 City of Redwood City. Draft Environmental Impact Report - Veterans Memorial Senior Center/YMCA Project. SCH# 2016112041. June 2019. Pages 94 to 98. 18 Ibid. Pages 71 to 73. 19 City of Redwood City. Addendum to the Environmental Impact Report for the Veterans Memorial Senior Center/YMCA Project. September 2022. Page 6. ATTY/RESO.0111/CC RESO CONSIDERING AND APPROVING AN ADDENDUM TO THE FINAL EIR (YMCA PROJECT CEQA) - EXHIBIT A REV: 11-06-25 VR