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7.A. - Page 28 ATfACHMENT 1 <br /> Mitigation: Mitigation 15-1. As recommended by the project's preliminary geotechnical <br /> investigations, prior to City issuance of grading permits for individual project <br /> construction phases, the applicant shall be required to retain a registered <br /> engineering geologist or geotechnical engineer to prepare detailed, design-level <br /> geotechnical investigations to guide the design of all project grading and <br /> excavation activities. The detailed, design-level geotechnical investigations shall <br /> be performed for each of the structures proposed for the development site. <br /> Subsurface conditions shall be explored and laboratory tests conducted on <br /> selected soil samples to establish strength parameters for the design of <br /> excavations, retained slopes and fill placement, and to determine the corrosive <br /> potential of both Bay mud and imported fill on foundation elements and buried <br /> utilities. Recommendations from the investigations shall be incorporated into all <br /> plans for project grading, excavation, soil support (both temporary and long-term) <br /> and utility construction, to the satisfaction of the City Engineer. <br /> The detailed, design-level investigations, relevant recommendations, and all <br /> associated project grading, excavation and foundation plans, shall be subject to <br /> review and approval by an independent engineering geologist or geotechnical <br /> engineer retained by the City Engineer at applicant expense. In addition, the <br /> project civil engineer shall certify to the City Engineer (e.g., through plan <br /> submittal for City review) that all relevant provisions of the investigations have <br /> been incorporated into the grading, excavation and construction plans, and all <br /> earthwork and site preparation shall be performed under the direct supervision of <br /> a registered engineering geologist or geotechnical engineer. <br /> Finding: Implementation of Mitigation 15-1 would reduce the potential excavation and <br /> grading impacts to a less-than-significant level. <br /> Facts in Support of Finding: Implementation of Mitigation 15-1 would reduce potential <br /> excavation and grading impacts to a less-than-significant level by requiring <br /> detailed, site-specific geotechnical investigations and solutions prepared by a <br /> registered engineering geologist or geotechnical engineer, with review and <br /> approval authority by the City Engineer. These facts are described in Draft EIR <br /> chapter 15 (Geology and Soils) on pages 15-1 through 15-15, which is hereby <br /> incorporated by reference. <br /> Impact: Impact 15-2: Excavation Instabilities Caused by High Groundwater. <br /> Groundwater encountered during construction of the proposed project's below- <br /> grade installations could destabilize excavation walls, reduce the bearing <br /> capacity of in-place soils that might otherwise be suitable for foundation support, <br /> and exert additional stresses on basement walls and floor slabs. <br /> Mitigation: Mitigation 15-2. The detailed, design-level geotechnical investigations <br /> recommended under Mitigation 15-1 for each project construction phase shall <br /> fully characterize groundwater conditions on the development site and make <br /> appropriate recommendations regarding dewatering techniques, slope and <br /> shoring requirements for excavations, stabilization or replacement of saturated <br /> foundation materials, and hydrostatic pressure implications for the design of <br /> below-grade structures. <br /> ATTY/RES0.2901/STANFORD EIR CERTIFICATION <br /> REV:08-29-13 VR <br /> Page 18 of 56 <br />