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c} All drilled picr foundations shall be designed for soil creep <br /> pressures. <br /> d) Permanent drai.nage m�asure,s sha11 be itestslled on all lots to <br /> intercept surface water infiltration and mig�rating subsurface water <br /> and thus reduce the likeIihood of soils becaming wet aad unstable. <br /> e) Drilled pier foundatione shall be used for houses on sl4ping lots. <br /> fl Detailed fo�ndatiaa exp�orations�hall be pexformad for each lot <br /> during the design-Ievel geotechxucal investigation to collect site- <br /> specific data.rega�rding slope creeP,expansive soils, and s�rpentinite <br /> rack. <br /> g) Garage slabs on grade, dri�evvays,walkwe.ys,sidewalks,aad pavers <br /> shall ha�e sufficient reinforcem�nt and be supported on a layer of <br /> non-expansive fi11. <br /> h) All residences,retaining walls,and�iaret�ntion basins shsll be <br /> supported nn drillac�,cast-in-place, straight-shai�frictioa piers or <br /> simylar cansttuction. Consideration ahall be given on a case-by-case <br /> basis to the need for extra steel t�inforcement of the piers aad grade <br /> beams,voids be�eath grade beams to�nitigate uplift distress to the <br /> sttuctures,perimeter subdrains and moisture baxriers, and <br /> eonstruction precautions for conarete over pours at the tops of the <br /> clrilled piei s. <br /> i) Proper detailing of oonstruct�ion and r,ontrol joints for concrete slabs <br /> shall be considered in the final design of sidewalks and patios in <br /> areas of expansive soils,For example, a constr¢����oint with reb� <br /> dowels may be pravided when cnncrete slabs an gI'acle meet the <br /> pa1aposed perimet�r fauncfa�ian for th�resir�ence ta minimiza vertical <br /> of�set from soil expansion or shrinkage. <br /> j} A detailed crsek bank evaluation shall be performed during the finat <br /> geotechnical investigation once gradiag and improvement plans are <br /> available. <br /> ]�) The design-l�vel geotechnicat inv�s�igation for Lc�t 13 a�nd a111o�s <br /> aloag the downhill side a�I.aure�Way shall evaluate the potential <br /> far c�ek bank erosion or landslidi.ng,and provide mitigation <br /> measures as appm�riate. <br /> 1� All pmposed structu�res and improvements sl�ll be set an apprc�priate <br /> distance frosn the top of t�e existing cteek banks ��n�by <br /> the City and per the requirements of Zoni.ng Qrdinance <br /> Section 32.12. <br /> m) Cansid�ration shall be given to biate.�hnical creek bank stabilization <br /> ma#hods and Iimiti.ng surfaee water n�tioff into the creek, <br /> n) Install x.subdrain systein af perfarat�pipe and p��ble drain <br /> rock ar gravel as needed to mitigate potential springe that�uld <br /> ocxur during the�vinter. Subdrains shall be insta�led where seepage <br /> 3Q <br />