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Impact: lmpact 95-2: Excavation Instabilities Caused qy High Groundwater. <br /> Groundwater encountered during construction of the proposed project's below- <br /> grade installations could destabilize excavatian walls, reduce the bearing <br /> capacity of in-place soi�s that might atherwise be suitable for foundation support, <br /> and exert additianal s#resses on basement walls and ffaorslabs. <br /> Mitigation: Mitigation 75-2. The detaifed, design-levei geotechnical investigations <br /> recommended under Mitigation 95-1 for each project construction phase shall <br /> fully characterize groundwater conditions on the development site and make <br /> appropriate recommendations regarding dewatering techniques, s�ope and <br /> shoring requirements for excavatians, stabilization or replacement of saturated <br /> foundation materials, a�d hydrosta#ic pressure implications for the design of <br /> �elow-grade structures. <br /> Finding: Implementation of Mitigation 15-2 would reduce these patential groundwater <br /> impacts to a less�than�sign�cant level. <br /> facts in 5upport of Flnding: Implementation of Mitigation 95-2 would reduce potential high <br /> groundwater impacts to a less-than-significant level by requiring detailed, site- <br /> specific geatechnical investigations and solutions prepared by a registered <br /> engineering gealagist or geotechnical engineer, with review and approval <br /> authorify by the City Engineer. These facts are described in Draft EIR chapter 15 <br /> (Geology and Soils) on pages 15-1 through '15-15, which is hereby incorporated <br /> by reference. <br /> Impact: Impact 76-3: Soil Erosion. Project development would disturb the site's <br /> existing cover of bu�ldings, pavements and landscaping, potentialEy leaving soils <br /> exposed to wind and water erosion during the construction period. Eroded svils <br /> wauld be washed into on-site drainage facilities that discharge to the Bayfront <br /> Canal and San Francisco Bay. Deposition of these sails through natural <br /> sedimentation could ad�ersely affect the carrying capacity flf drain lines, purrtping <br /> equipment and open channels, increasing flooding potentiaf and maintenance <br /> requirements. In addition, suspended sediment would degrade water qualjty in <br /> the canal and in the bay by increasing turbidiiy levels. <br /> Mitigation: Mitigation 15-3. The applicant shall de�elop an erosion control plan in <br /> accordance with the {�rovisions of the project's City-approv�d Stormwater <br /> Pollution Prevention Plan (SWPPP). The erosion control plan would be <br /> implemer�ted throughout project construction, and would include measures for <br /> the post-construction stabilization of all disturbed ground. <br /> Finding: lmplementation of Mitigatian 15-3 would reduce these pot�ntial soil erosion <br /> impacts to a less-than-sign�canf level. <br /> Facts in Support of Ffnding: Implementation of Mitigation 15-3 would reduce potential soil <br /> erosion impacts to a iess-than-significan# le�el by requirin9 detailed, site-specific <br /> geotechnical investigations and solutions prepared by a register�d engineering <br /> geologist or geotechnical engineer, with review and approval authority by the City <br /> Engineer. These facts are described in Draft E!R chapter 15 {Geo�agy and Soils} <br /> on pages 15-1 #hrough 15-15, which is hereby incorporated by reference. <br /> ATTY/RE50.2898/PC RE50 REC�MMENDING 57ANFQRD EIR CER7IFICATION <br /> REV:08-15-13 VR <br /> page 19 of 56 <br />