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potential ta expose people ar sirucbxres to potential substantial adverse effeots <br /> from strong ground shaking,which could cause movement of maberials and <br /> overlying structures as a result of difFerential settiiag. <br /> M�tigat�on: Nlitfgaiion Me�sure Geology 1: All reoommendations€n tho TRC Lowney <br /> (2007'},Cornexstone Earth Group(200$), and T�eadwel��t Rollo(Z00$a and <br /> 2408b)ge�atechnical f�asibility docume�ts,included in Appendix B, shall be <br /> imple�mented. These measures include the fallawing: <br /> a� All undocumented fills beneath pavement, driveway, or other hard- <br /> sc+ape areas shall be removed down to native soil aud replaced with <br /> campacted engineered fi11. <br /> �} Ali undocumente�fills heneath�raposed stcuctures sha11 b�reaioved dowxx <br /> to n�iave soil and replaced as campacted engineer�cl fill,tYnles�the <br /> stractures are supported on drilled pier foundations,which der�ve support <br /> fram the underlyiing native soils and bedrock. <br /> c) AlI drilled pier foun+dations sha11�e desigaec�f�r soil creep pressures. <br /> d) Pexmanent drainage measure.s shall be installed oa all lots to intercept <br /> surface water infiltration and migrating subsurfaae water and thus reducc the <br /> likelihood of soils becomiag wet and unst�ble. <br /> e) Drilled pier foundations shall be used for houses�n sloping 1ots. <br /> fl Detailed faundation explorat�ons shHll be performed for each lot during the <br /> design-lev�l geotechnical investigxtion to cnlle�site-specific data regarding <br /> slope areep,acpansive soils, and serpentinite�+ock- <br /> g) Garagc slabs on grade,driveways,walkways,sidewalks, and pav'ers shal� <br /> have sufficient rea�£am.ement aud be supportcd on a layar of non-expansive <br /> fi1L <br /> ���'� All�sidences,retaining wall�,and bio-retention basins s�l be supparted <br /> on drilled,csst-in place, straight-sh�ft frietion piers or s�nilar construction. <br /> Consid�xatio�shall be given on a case-by-case ba$ys ta the need for elctra <br /> steel rcinforcem�nt of the piers and grade bea�ms, voids beneath gade be�ns <br /> to mitigate uplift diatress to the structure�,perimeter sn6drains a�d moistnre <br /> barriers, and construction precautions for concrete ovet`-powrs at the t4ps of <br /> the drilled piets. <br /> i) Proper detailing of construction aad contr�ol joints f�or concrete slabs shall be <br /> considered in the t�nal design o�sidewa�lcs and patios in areas af�pansive <br /> sail�.For example,a constnict;ion joint wit�rebar dawels may l�e provided <br /> w�en concrete�labs on grade meet tf�e�ropose� pet'imeter€oundation for <br /> the residence to minimize vertical offset from soil expansion or shrinleage. <br /> ��! A detailed areek bank evaluation s�ha11 be performed during the final <br /> geotechnicat investigation once�adir�g and improvement plans are <br /> available. <br /> k} The design-level geoteehnical in�restigation for Lat 13 and all�ots along#he <br /> downhill side of Laurel Way shall evaluate the pat.ential fox'creek bank <br /> erosion nr lands�iding,and provide mitigation measures as appropriabe• <br /> ZU <br />