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• According to the Preliminary Geotechnical Investigation prepared <br />for the Armstrong Ranch Development Project, soil materials on <br />.the project site consist of f-ill and native alluvial soils. <br />The fill material generally consists of dark gray to black silty <br />clays and clayey silts to depths of 31/2 feet to 6 feet. These <br />soils have moderate expansion potential. Native alluvial soils <br />were encountered at depths 18 to 45 feet below the surface and <br />consisted primarily of soft dark gray to black silty clays. <br />These soils were also considered to have moderate expansion <br />potential. The moderate expansion potential of shallow soils <br />would be considered a geotechnical concern. Additionally, the <br />corrosion potential to buried steel is characterized as <br />primarily severely corrosive when wet. This could affect buried <br />utility lines and other support structures. To insure the <br />geotechnical stability of the proposed project, Final <br />geotechnical report with design recommendations shall be <br />prepared. <br />Mitigations Measures <br />• A final design geotechnical report shall be prepared for <br />• the proposed project to provide structure-specific <br />geotechnical recommendations. The -final report shall <br />address all issues initially covered in the Preliminary. <br />Geotechnical Report prepared for the Armstrong Ranch <br />Development Project. Final recommendations.on earthwork, <br />spread footings with slabs-on-grade, reinforced mat <br />foundations, post-tensioned mats, friction piles, .cathedral <br />retaining (basement) walls, and measures to address soil <br />corrosion shall be ..identified. The final report shall <br />specify foundation recommendations- 'to ensure issues <br />associated with underlying soft, compressible clay soils <br />are addressed. Construction of the project shall comply. <br />with all recommendations in the final geotechnical report. <br />E. Where sewers are not available for the disposal of <br />wastewater is the soil capable of supporting the use of <br />septic tanks or alternative wastewater disposal systems? <br />No Impact <br />The project site is located within urban setting where sewer <br />service is available. The proposed project would not require <br />septic tanks or alternative disposal systems. <br />15 <br />~~ 1/~of 4~ Q <br />