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8.A. - Page 47 Summary of Impacts Potentially Less than Signifcant Less than Significant With Mitigation Signifcant No Im act Incor orated Im act Im act alternative wastewater disposal systems where sewers are not available for the disposal of wastewater? Documentation: a. i) The Downtown Precise Plan project area is located within the seismically active San Prancisco Bay Area. The significant earthguakes that occur in the Bay Area are generally associated with crustal movement along welL definec� acfive fault zones of the San Andreas Pault system, which trends in a northwesterly c&rection. The project site is located appraximately five miles northeast of the San Andreas Pault Two other major acfive faults in the area are the Hayward Paul� located about 14 miles northeast of the project site, and the San Gregono-Seal Cove Paul� located about 13 miles to the west (DTPP program EIR p. 16-I) The project site is not within an Alguist-Pnolo Earthguake Pault Zone (DTPP program EIR p. 16-I); therefore, there is no known potenfial forfault rupture on the site. ii) The project site lies in a seismically acfive region and is subject to ground shaln�ng from an earthguake along major active regional faults. This is common to virtually all development in the San Prancisco Bay Area. Development on the site will be subject to review and approval by the City and shall be designed and constructed in accordance with all applicable seismic standards adopted by the City ofRedwood City, incluc&ng the California Builc&ng Code (CBC), which reguires that a site-specific geotecYmical investigation be conducted and report prepared by a licensed professional. The site-specific geotechnical report must provide measures to reduce potenfially significant geologic hazards (e.g., expansive and corrosive soils, differential settlemen� and slope instability). The geotechnical report is subject to City Builc&ng Official approval pnor to the issuance of grac&ng and build(ng permits. (DTPP program EIR p. 16-4) The reguired contents of the geotecYmical report are descnbed in DTPP program EIR Mitigation 16-1 and on EIR page 16-6. Technigues and standards for effecfive geotechnical pracfices are widely known and accepted Inc&vidual measures for parficular sites and projects are typically specified at a detailed level of design. The City routinely reguires such geotechracaUgeologic investigations and specificafions, and a significant record erists demonstrating the effectiveness of such design and engineenng reguirements in adeguately addressing potential soil and geologic issues Under the City's grading permit and builc&ng permit regulations, an inc&vidual development project carmot be given final approval without project compliance with geotechnical/geologic reguirements. These reguirements and related City inspection and venfication procedures before project occupancy provide reasonable assurances that the project will incorporate the design and engineenng refinements necessary. iii) Liguefaction is a process whereby strong ground shaln�ng causes loose, saturatec� unconsolidated sec&ments to lose strength and behave as a fluid The site-specific geotechnical report reguired for the project(see item ii above) will also address liguefacfion potential. iv) The projectsite is relatively flat,� therefore, no impacts from landslides are anficipated In conclusion, the Downtown Precise Plan program EIR concluded that while the DTPP area could be subject to moderate to high suscepfibility to ground shaln�ng �d liguefaction, the City's routine grac&ng and builc&ng permit regulafions provide reasonable assurances that the project will incorporate the design and engineenng refinements necessary to reduce the impact of DTPP facilitated development to a less-than-significant level reguinng no addifional mitigation. b. The project shall be subject to Downtown Precise Plan program EIR Mitigafion 16-3, which shall be reguired as a conc&tion of project approval. The mifigation reguires the applicant to prepare an erosion control plan subject to City approval and consistent with the reguired San Mateo County Stormwater Pollution Prevention Plan (SYVPPP) BestManagementPracfices The plan shall be implemented dunng construcfion and will reduce the potentially significantimpact on soil erosion and sec&mentation to a less-than-significant level. c. No changes to geologic substructures are expected to occur as a result of project implementation. As descnbed in item (a) above, the proposed project will comply with all local and State codes and regulafions, and project design will incorporate City-approved geotechnical recommendations for site development Therefore, this impact is considered less than signific�t 12