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Legend: Applicant = project applicant, City = City of Redwood City <br />Page 58 May 18, 2004 WP9.01645lMMCHT.645 <br />M%- ..ITORING <br />VERIFitATION <br />IDENTIFIED IMPACT <br />RELATED MITIGATION MEASURE <br />Impl. <br />Type of Impl. <br />Monitoring and <br />Timing <br />Signature <br />Date <br />(CONDITION OF APPROVAL) <br />Entity <br />Action <br />Verification Entity <br />Requirements <br />Impact 11 -4: Encountering Groundwater in <br />Mitigation 11 -4: Require that the detailed, <br />Applicant <br />Prepare and <br />City <br />Investigations <br />Bay Mud During Excavation. Excavation <br />design -level geotechnical investigations <br />implement detailed, <br />prior to grading <br />for the proposed project's below -grade <br />recommended under Mitigations 11 -1 and <br />design -level <br />permit issuance; <br />installations, such as utilities, might be difficult <br />11 -2 include analyses of groundwater and <br />geotechnical <br />implementation <br />due to the high groundwater and relatively <br />Bay mud within the limits of all foundation <br />investigations. <br />throughout <br />shallow depth of the weak Bay mud. This <br />and utility construction. The analyses shall <br />construction <br />condition represents a potentially significant <br />make recommendations regarding <br />phases <br />impact <br />dewatering techniques, slope and shoring <br />requirements for excavations, buffer zones <br />for construction equipment near slope <br />edges, the potential for requiring light <br />grading equipment, subgrade remediation <br />techniques, and the use of excavated fill. <br />Project grading and construction plans shall <br />incorporate the results and <br />recommendations of these analyses. In <br />general, these recommendations are <br />expected to include, but not be limited to, <br />the following provisions: <br />• Soil excavated from below the water <br />level would be saturated and would <br />require drying before it can be used as <br />fill. Continuous dewatering of <br />excavations might be required. <br />• The sides of the excavations should be <br />sloped or shored to minimize ground <br />movements; steep cuts are not <br />possible in Bay mud unless shoring is <br />used. Typically, when excavation <br />extends into Bay mud, 4:1 or flatter <br />slopes are required to reduce <br />movements. <br />• Keep construction equipment away <br />from the edges of slopes in order to <br />reduce vibration degradation. Consider <br />light grading equipment to avoid <br />creating ruts in the subgrade, a <br />situation that might require pumping. <br />Remediate rutted subgrade areas by <br />over - excavating the soft area to a depth <br />of 18 to 24 inches, placing a geotextile <br />Legend: Applicant = project applicant, City = City of Redwood City <br />Page 58 May 18, 2004 WP9.01645lMMCHT.645 <br />