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MOUNTAIN HousE PROPOSED MACHADo TENTA77vE MAP 4. ENvrRoNmENTAL CHEcrosf 4.6 GEOLOGY AND Sous b earthquakes with magnitudes of 6.7 or higher. Earthquakes of magnitude 6.0 or greater are capable of causing widespread damage(EDAW, 2005b). The proposed project would be required to comply with all California laws and codes designed to minimize the potential adverse effects of an earthquake. The laws include the Essential Services Buildings Seismic Safety Act of 1986 (governing fire,police, and ` emergency services building construction)and the Field Act of 1933 (governing school construction). The codes include the California Building Code of 2002,the Uniform Building Code(UBC)of 1997, and Mountain House Community Services District(MHCSD) design standards. Complying with California laws and codes related to design and construction of houses and buildings, structural damage from a strong earthquake would be minimized,particularly in wood-frame houses proposed for the proposed project. However, despite the implementation of mitigation measures in the MEIR and the policies of the MHMP,as well as compliance with applicable laws and codes,the SPIIIEIR found the impacts related to ground shaking as significant and unavoidable and cannot be mitigated to a less-than-significant level. Mitigation Measures MEIR Mitigation Measure M4.6-1 (preparation of a Community Earthquake Preparedness w Plan)promotes public awareness and education on earthquake hazards. This plan has been %, completed and is currently being implemented by the MHCSD. In addition,the MHUT includes Policies 6.5.1(b)(Emergency Preparedness)and 6.8.3 (Soils, Geologic, and Seismic Hazards). No additional mitigation measures are available that would change the conclusions V of the SPIIIEIR. iii) Seismic-related ground failure, including liquefaction? Vr %W The potential for liquefaction of soils at the proposed Mountain House Business Park,located ` approximately 3,000 feet south of the project site,was evaluated in a Preliminary Geotechnical Services Report(Kleinfelder,2002). Based on the depth to groundwater(38 to % 43 feet bgs),the high clay content of site soils,and the relatively dense nature of coarse- %W grained soils, the potential for liquefaction at the site was determined to be remote. Although %W the depth to groundwater is less at the project site(and may be influenced by water in the dairy ponds),the potential for liquefaction would be remote if recommendations of a geotechnical/soils professional regarding design of houses and buildings for the proposed `, project are followed. iv Mitigation Measures ` No mitigation measures are required. iv) Landslides? \r `r 4-29