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region. Strong earthquake shaking can cause non-uniform compaction of the soft, which could <br />result in damage to on-site structures. <br /> <br />Mitigation Measure for Impact GEO-1. <br /> <br />GEO- 1 <br /> <br />A final design geotechnical report shall be prepared for the residential and church <br />development to provide structure-specific geotechrfical recommendations. The fmal <br />report shall address all issues initially covered in the Preliminary Geotechnical <br />Report. Final recommendations on earthwork, spread footings with slabs-on-grade, <br />reinforced mat foundations, post-tensioned mats, friction piles, cathedral retaining <br />(basement) walls, and measures to address soft corrosion shall be identified. The final <br />report shall specify foundation recommendations to ensure issues associated with <br />underlying soft, compressible clay soils are addressed. Construction of the project <br />shall comply with all recommendations in.the fmal geotechnical report. <br /> <br />Findings for Impact GEO-I. The City £mds that the above-identified changes or alterations <br />would reduce the impact identified as GEO-1 to less than significant levels and are herby <br />incorporated into the project. No additional mitigation measures are necessary with the <br />implementation of Mitigation Measure GEO-1. <br /> <br />Impact GEO-2. Proposed development would be exposed to site-specific soil conditions that would <br />result in structural instability ff buildings are not properly designed. Soil characteristics have the <br />potential to result in damage to building foundations and associated unstable building conditions ff <br />structures are not properly designed. The primary geotechnical concerns at the site are the tilled <br />soils at the surface, and the underlying soft, compressible clays to depths of 20 feet or more. The <br />moderate expansion potential of shallow softs is also a geotechnical concern. Soft testing also <br />indicates that the corrosion potential to buried steel nia-y be characterized as primarily severely <br />corrosive when wet. This could affect buried utility lines and other support structures. <br />Groundwater was encountered in all test borings at approximately 13 to 27 feet below the ground <br />surface, so the potential exists for groundwater to affect structural integrity both during <br />construction and operation. <br /> <br />Mitigation Measures for Impact GEO-2. <br /> <br />11 <br /> <br /> <br />