11 ATTACHMENT 4 - Laserfiche WebLink

15. Unstable soil conditions -expansive and/or corrosive soils (pp. 147-148, 150- 151 and 363-365; Condition 64-70 of PUD-33; MMIP F3a and F3b). a. Potentiallmpact. Expansive and/or corrosive soils could adversely affect structures or property. b. Mitigation Measures. The following mitigation measures are hereby adopted and will be implemented as provided for in the Mitigation Monitoring and Implementation Program: • Implement Oak Grove Planned Unit Development (PUD-33) Mitigation Measures F3a and Fab. c. Findings. Based on the EIR and the entire record before the City, the City finds that: (i) Effects of Mitigation. The Environmentally Superior Project's potential impacts due to slope instability will be mitigated to less than significant levels as the Environmentally Superior Project includes, as conditioned, requirements that Mitigation Measure F3a and Fab be implemented and through the implementation of the following specific actions: The project developer shall undertake a detailed, design-level geotechnical investigation and, based upon this investigation, shall submit adesign-level report with the tentative subdivision map that incorporates and further develops the conclusions and recommendations of the existing planning/development level geotechnical report and the comments and recommendations provided by the City's peer review geologist/geotechnical engineer. The report shall be subject to the review and approval by the City Engineer before the Planning Commission's action on the tentative subdivision map. To ensure that structures or property is not adversely affected by expansive and/or corrosive soils, the report shall include design standards for the design of the proposed building foundations and improvements, including sidewalks, parking lots, and subsurface utilities, shall incorporate measures to ensure that potential damage due to the shrink/swell potential of the site's soils is minimized. Site soils be tested and evaluated for corrosivity. If corrosive soil conditions are present, the report shall identify the appropriate measures to mitigate these conditions that shall be incorporated into the design of project improvements that may come into contact with site soils. Wherever corrosive soils are found in sufficient concentrations, recommendations shall be made to protect iron, steel, metal, and concrete from long-term deterioration caused by contact with corrosive onsite soils. Page 28 of 43