AgdaPkt 2013-09-09 - Laserfiche WebLink

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a,7.A. - Page 31 Mitigation: Mitigation 15-6. The detailed, design-level geotechnical investigations required under Mitigation 15-1 for each project construction phase shall include a site- specific evaluation of the liquefaction and settlement potential at each proposed building location. The investigations shall also propose measures as needed to offset the effects of liquefaction-induced settlement, either through stabilization of the most vulnerable sand layers or through utilization of building foundation, utility connection, and pavement designs that can withstand the anticipated degree of total and differential settlement. Finding: Implementation of Mitigation 15-6 would reduce these potential seismically induced settlement impacts to a less-than-significant level. Facts in Support of Finding: Implementation of Mitigation 15-6 would reduce potential seismically induced settlement impacts to a less-than-significant level by requiring detailed, site-specific geotechnical investigations and solutions prepared by a registered engineering geologist or geotechnical engineer, with review and approval authority by the City Engineer. These facts are described in Draft EIR chapter 15 (Geology and Soils) on pages 15-1 through 15-15, which is hereby incorporated by reference. Hazards and Hazardous Materials Impact: Impact 12-1: Potential Project-Related Exposure to Existing Soil or Groundwater Contamination. Project-related excavation and construction activities, as well as project operations, could expose on-site construction and maintenance personnel and members of the public to existing soil and groundwater contamination. Recommendations included in the August 2008 draft Site Management Plan (SMP) commissioned by Stanford University for the Stanford development portion of the Precise Plan area identify the environmental issues associated with project development site construction activities (e.g., excavation, dewatering, etc.) and specify the contents of the site-specific, construction period Health and Safety Plan (HASP) that the construction contractor must prepare (a standard CaIOSHA requirement for work at hazardous waste sites). The SMP also explains that site conditions do not preclude any of the uses proposed, but that further risk assessment is required when the precise on-site locations and details of sensitive uses such as child care, medical clinics, and recreation areas are identified, so that any mitigation measures specific to the operations of such uses will be identified and implemented. Pending completion of the required supplemental risk assessments and identification of ineasures to ensure compliance with residential-level ESLs for these sensitive uses, the proposed project's impacts during operations from potential exposure to existing groundwater and soil vapor contamination are assumed to represent a potentially significant impact. ATTY/RES0.2901/STANFORD EIR CERTIFICATION REV:08-29-13 VR Page 21 of 56