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2016-012 - California Environmental Quality Act
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2016-012 - California Environmental Quality Act
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2/23/2016 2:21:31 PM
Creation date
2/23/2016 2:04:03 PM
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City Clerk
Doc Type
Resolution
Doc #
2016-012
Date
2/2/2016
Destruction Year
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Statement of Facts and Findings <br />Geology and Soils <br />A. Facts <br />The project has the potential to result in exposure people or structure to potential substantial adverse <br />effects, including the risk of loss, injury or death involving strong seismic ground shaking because <br />the prej ect would add residents, employees, and development to the project site. Southern <br />California is a seismically active region, with numerous faults capable of producing significant <br />ground motions. As a result, development, including the project, is required to adhere to the <br />provisions of the CBC, which are reviewed by the City for appropriate inclusion, as part of the <br />building plan check and development review process. Compliance with the requirements of the <br />CBC for structural safety reduces hazards from strong seismic ground shaking. In addition, <br />Mitigation Measure GEO -1 is provided to reduce potential seismic impacts by requiring preparation <br />of a design level geotechnical report to provide specific construction and design requirements and <br />requiring that all grading and foundation construction activities be monitored by the geotechnical <br />engineer of record. Implementation of Mitigation Measure GEO -1 would reduce potential impacts <br />related to seismic ground shaking to a less than significant level. <br />The project has the potential to result in exposure people or structure to potential substantial adverse <br />effects, including the risk of loss, injury or death involving seismic - related ground failure, including <br />liquefaction. Potentially liquefiable soils have been identified at depths of 8 to 12 feet which have a <br />total dynamic liquefaction induced settlement of 1.1 inches, which is considered to be within the <br />structural tolerances of typical buildings. In addition, the alluvium soils onsite are compressible and <br />would settle due to the anticipated loads of the proposed structures. Mitigation Measure GEO -1 <br />requires a design level geoteclmical report to provide specific construction and design requirements <br />related to the potential of seismic - related ground failure. Implementation of Mitigation Measure <br />GEO -1 would reduce potential impacts related to seismic ground shaking to a less than significant <br />level. <br />The onsite soils possess severe concentrations of soluble sulfates as defined by the American <br />Concrete Institute Publication 318 -05 Building Code Requirements for Structural Concrete and <br />Commentary. Therefore, the Geotechnical Feasibility Study recommends specialized sulfate <br />resistant concrete mix designs that would be requires as part of Mitigation Measure GEO -1, which <br />would reduce potential impacts related to corrosivity of soils to a less than significant level. <br />4. The near - surface soils on the project site possess a low to medium expansion potential. As a result, <br />Mitigation Measure GEO -1 requires site - specific design level subsurface exploration, laboratory <br />testing, and engineering analysis to provide specific design and construction requirements pursuant <br />to the CBC, which would reduce the potential related to the potential expansion of onsite soils to a <br />less than significant level. <br />The Harhage Wad Use ProJect 29 CSA / 140730 <br />Sfalomenl of Facts and Findings Soplember 20 '15 <br />
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