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pro}�osed perimeter foUndation far the residence to minimize verxical <br /> offset fram soil expansion or shrinkage. <br /> �p A d�tailed creek bank�valuation shall be performed during the fi�al <br /> geatec}�nicaX investigativm once�ading and impr�vement p�a�►s are <br /> 2�vailable. <br /> k) The design-level geotechnical investigation for Lot I3 and a111ots <br /> along tYee�ownhill side of Laur�el W�y�s�all ev�aluate the pot�ntia�l <br /> for creek bank emsion or landslidirag, and pravide mitigation <br /> measures as appmgriate. <br /> 1) All propased strt�ctur�s and imprr�vements shall be s�an apprapriate <br /> d�stance frrnn the top of the exxi�ting creek baiYks as rlete�mined by <br /> tbe City and per the requirements of Zoning Ordinaace <br /> Seckion 32.12. <br /> m) Consideration shal]be given to biatechQical creek banlc stabiliza�ion <br /> m�thods aud li3niting s�,nface wat�rr n�not�inta tlie areek. <br /> n) Tnstall a subdrain syste�n of perfor�ted pipe and p�eable drain <br /> rack ar gravel as needed ta mitigafe potential sprin.gs that could <br /> oocur durin�the winter. Subdrains sha11 be installed where seepage <br /> is abserved,and a ranceptual subdrain p�an shall be preparsd once <br /> grading plans havE be�n finatized. <br /> o) A geotechnical�gineer shall be on site duriag or'just follawing <br /> heavy rainstorms to evaluate a�d map the locations of springs an the <br /> site,and provide recommendations for mitigating the adversg <br /> impacts o£s�mngs ar seeps,if necessary. <br /> p) `�'he shallow latidslide area on Lots 14 and 15 sk�l be completely <br /> remaved down to bedrock, and the grade rebailt with a keyed and <br /> bench�i engineered buttress fill c:ontainiag subdrains. <br /> q) Further evaluation ofthe questaomable landslide near the battom of <br /> Lats 3 and 4 shall be perform�dariag the design-Ieve1 geotechnical <br /> i�vestzgataans for�.ots I through 4 ta pm�ride detailed <br /> recommendations for keyways,benching,and subcirains.The design- <br /> level geotechnaaal investigation shall determine whether�.itigarion <br /> is needed to reduce the potentiaJ.for darnage to the planned site <br /> imgrove�nnents and the pot�ntial for adversely affectin�neighbaring <br /> Pxaperties. <br /> r} T�e bottom of the bio-retention l�asins an Lota 5, 7, S,9,and 10 sl�a.11 <br /> be lined v�vith HDPE liner to limit water infiltratian into the nativc <br /> sails below the permeable fiIter�oils.A subdrain shall be installed <br /> above the HDPE line,r to intemept the excess water and direct ft to a <br /> suitable dischazge point� The specific xecommendations for the <br /> HDPE Xiner system and subdrains shall be presented in the design- <br /> lev�l geotechnical report. <br /> 27 <br />