Agmt21 Environmental Science Associates Transit District

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Proposed Work Program June 2021 City of Redwood City / Transit District Subsequent EIR 16 Environmental science associates REV: 06-22-21 MI The increase in development accommodated by the proposed Transit District would result in increased demolition, subsurface disturbance and new construction activities in the DTPP area that may pose hazardous materials risks. DTPP use regulations do not allow new industrial or heavy commercial uses within the DTPP area. Nevertheless, an increase in population and residential uses within the DTPP area under the projects could result in an increase in exposure to risks from existing commercial uses in the vicinity. These effects will be addressed, along with a discussion of governing federal, State and local regulations and requirements that are in place to ensure potential hazardous materials risks are minimized. Biological Resources The DTPP area is largely developed with urban uses, with sensitive biological habitat largely limited to the areas in the vicinity of day lighted portions of Redwood Creek. The DTPP Final EIR identified certain impacts to biological resources under the DTPP during construction, including to northern salt marsh and wetlands (adjacent to Redwood Creek); and to nesting birds and with loss of heritage trees. These potential impacts were concluded to be less than significant with implementation of mitigation, including acquiring required permits and approvals from the applicable resources agencies, compliance with the City’s stormwater management program, and conducting nesting bird preconstruction surveys. It is expected that implementation of similar mitigation would ensure effects to biological resources that may occur under the Transit District would be less than significant. Geology and Soils The DTPP Final EIR found certain impacts to geology and soils under the DTPP would be potentially significant, including with expansive and corrosive soils, and with soil erosion/sedimentation during construction, however, these effects were determined to be mitigated to less than significant (e.g., with implementation of design measures as specified in geotechnical investigations for development projects, and compliance with applicable governing requirements and regulations for erosion control, and other best management practices). The Transit District would involve projects that require additional subsurface disturbance, and it is expected that implementation of similar mitigation measures would ensure effects to geology and soils would be less than significant. ATTY/AGR.2021.149/ESA (Transit District CEQA) (Page 26 of 26)