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and Revised Final EIR page�4-1'7 througk 4-20,which are hereby incozporated <br /> by reference. <br /> Impact 3.5�3 <br /> �mpact: Pmject components wQUld have the�at�ntial to be locate�i an expansive soil,ar <br /> result in sUbsidence or collapse fro�m settling of loosel}'consolidated soils,w�i.ah <br /> would create substant�al risk$to life o�property. <br /> Mitigalion: Mitigation Measure Geaiogy-lt All recommendations in the TRC Lowney <br /> (2�0'y}, Cornerstone Earth Group(2008), and Treadwell&R�llo (2008a and <br /> 2008b) geotechnical fe�sibility documents,included in Appendix E,shall be <br /> implement,�. 'These measures include the following: <br /> a} A1l wnclocwn�ted fi11s ben�eath pavement,driveway,ar other hard- <br /> scape ar�as shall be removed down to aative soii and�eplaced with <br /> compacted eugineered fiil. <br /> b} All undocumcnted fills beneath proposed structurea shall be re�o�ed <br /> down to native soil and replaced as r.ompacted et�gineered fi11,�iess <br /> �;�e structures ar�supported on drilled pier foundations,which derive <br /> support fram the underlying native soils and 6edroek. <br /> c) AIl drille�i pier foundations shali be designad for soil creep <br /> pressw�es. <br /> d} Pezmanent drainage measuxes shall be installe�l on all lots ta <br /> intercept surface water infiltration and migrating subsurface water <br /> and thus reduce the likelihooc�af sails beeaming wet and unstable. <br /> e) Dri7led pier founcyations shall be�xsed for houses on sloping lots. <br /> fl Detailed foundation explora#ions shall be perform�for each lot <br /> during the design-leve]geotechnical investigation to r,ollect si� <br /> specific data regardin�slope creep, expansive soils,and sexpentinite <br /> xock. <br /> S) Garage slabs an grade,drivewa�s,wallcways, sidewalks, and pavers <br /> shal�have sufficient reinforceme.nt and be suppox�on a layer of <br /> non-expansive fill. <br /> h) All residences,retaining walls, and bio-retention basins sl�l be <br /> supported an drilled, cast in-p�ace,straight-shaft fric#ion piers or <br /> simil�r constraction. Consideratian shall be given an a casa-by-case <br /> basis to the need for extra steel reinfQZ1cetnent of the piers atad grade <br /> bsaxns,voids beneath grade beams fia mitigate�plift distress to the <br /> structures,perimeter subdrains and moisture b arri ers, and <br /> rn:nstnxctian precautians for ooncrete aver-pours at the tops of the <br /> drilled piers. <br /> �� Proper detailing af construction and oontrol joints for ooncrete slabs <br /> sha11 be conaidere�in the final design of sidews�.ks atid patias in <br /> azeas af expansive soils. For example,a oonstruction joint with rebar <br /> dowels may be provided wh�n conarete slabs on �'ade meet tbe <br /> 26 <br />