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i <br /> 3.2 PROPOSED ACTION (MASTER PLAN R-1) <br /> The proposal would require eerthwork for the addition of�pproximately 5,592,I04 square feet <br /> of combined office,produetion,and warehouse spece plus approximetely 20,133,522 aquare feet <br /> of additional ground support, roads, and parking, and approximately 12,425,272 equare feet of <br /> landscaping and open space.The negative impacts are anticipated to be generally the same u for <br /> the No Action Aiternative, except of lerger magnitude. <br /> 3.2.1 Excavations -Generaily,the buiidings and essocieted parking end rosdways are Dlanned to I <br /> be constructed at or near existing grades. An exception is building 40-88 which is planned to be <br /> constructad within the sloped area immediately north of the North Perimeter Road at the i <br /> northeast co�ner oC thn site. <br /> i <br /> � <br /> 7'he possible negative impacls will be as presented in aection 3.1.1. � � <br /> 3.2.2 Fill Piacement - The aoils genereted from the excavations for the building footprints, <br /> utilidors and tunnels are proposed to be placed in proposed storage areas in the northwest portion <br /> of the site. Soils which are moisture aensitive and which receive precipitation during placement <br /> mey become difficult to compact and result in the same impects as presented in section 3.1.1. <br /> 3.2.3 Sioped Areas - Based on existing topographic information and the proposed project <br /> config�ration,it appears that the majority of the areas steeper than 25 percent fall within portions <br /> of the site which wiil not be developed. The oniy eaisting areas steeper than 25 percent which <br /> may be developed under the proposal ere situeted within several of the locetions proposed for <br /> receiving structural fill plecement, end one buitding location. More specificeily, fill stockpile <br /> areas AA and CC(noted on Exhibit 6,Soil Storaae Are�c)heve isoleted relatively steeper slopes. <br /> The proposed fiil soils within the eree would be engineered and wouid result in an overail increase <br /> in slope stability. <br /> Building 40-88 is proposed to ba constructed within a slope situated immediately north of the <br /> North Perimeter Road et the northeast corner of the site. Present plans call for the building to be <br /> situated into the side of the hillside with the ground floor at the base of the slope. The wal�s of <br /> the building will be designed to withstand the anticipated earth pressures. The net result will be <br /> an increase in the siope staSility. <br /> 3.2.4 Earthquake Related Risk - As noted in section 3.1.4,the earthqueke related risks on the site <br /> ere limited to possibie liquefac�ion of saturated soils within the isoiated wetlands areas, and mass <br /> wasting of the siopes steeper than 25 percent. <br /> The planned buildings and related facilities will be designed to withstand e msgnitude 7.5 <br /> earthqueke with e peak ground acceleretion of 20 percent of gravity(0.2g). Based on the existing ' <br /> geology, the negative impacts associeted with earthquake hexards would be negligibie <br /> 3 <br />