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scdimcnts that comprise the corc of the slope. BGC, pllc will be available to provide geotectmical <br /> engineering special inspections during the devclopment of the project and will address any <br /> unanticipatcd gcotechnical conditions should thcy occur. <br /> Sifc Preparaiion <br /> Site preparation for construclion of the planned new development wiU consist oCremoval of the <br /> existing vegetation from thc building arca. Other than the lazge Vices that may need to be removed <br /> as part of future landscaping plans, the remaining vegctntion outside of the building envelope should <br /> bc left intact until aftcr thc foundation construction to providc crosion control covcr during <br /> development. Soil from the foundation excavation area that will not be used as backfill should be <br /> removed from thc site or may be placed as landscaping fill around thc perimeter of the development <br /> area. All fill soil placed should be placed on horizontal benches cut into the slopin� ground. <br /> 7'cmpor.lry cut slopes into thc mcdium den.sc fill soils and den.sc snnd for installation of tlre <br /> foundation should be sloped back to a I H:1 V inclination. For all utility excavations deeper than 4 <br /> fcct should usc n vcnch shicld or also bc slopcd back during installation. Cut slopc inclinations may <br /> be adjaated in the ficld to suit the wcather and soil conditions at lhe time of cxcavation. Soil to bc <br /> rauscd onsitc should bc covcrcd with plastic shecting to rcducc thc potcntii�l for crosion and <br /> scJimcnt transport and to maintain thc watcr contcnt of thc cxcavatcd soil. <br /> F�ouudations <br /> Sprcad footing foundations may be used for foundation support of the planncd additions to thc sin6lc <br /> family residcncc. An allowable foundation bcaring capacity of 2500 pounds per squarc foot may hc <br /> uscJ for sprcad footings scl to bcar on thc densc advancc outw ish sand scdimcnts. A short tcrm <br /> incrcasc of onc-third mny hc uscd for wind, snow, or scismic londs. In ordcr t�� kcy the foundation <br /> into thc slopc, all footing shall bc excavatcd a minimum of 4 feet below current gradcs to set tlie <br /> hase of thc footing a minimum of 2 fcet into the Jcnse sand. Mticipated sctNement oC the <br /> foundatiuns placed as described should be less than l indt. I3GC, plle perfortn a foundation soil <br /> t�eariug evaluation prior to placing foundation concrele lo ��erify that the prepared footing subgrade <br /> complics witli Uie recommendauons in diis report. <br /> Lateral loads will be resisted by friction betwern tJie loundation and the suppurting soils, :tnJ/or by <br /> p.usive e:uth pressure acting on the buricJ purtions of the foundatioru. �T�c foundutiuns must be <br /> backtilled wiUi fill compactcd to a mcdiu n dcnsc, non-yiclding condition ro achicvc thc passivc <br /> r�sist�vice prnvidcJ hclow. We recommend Ihe fullowing dcsil;n paramctcrs for lalcral load <br /> calculations. <br /> • I'assivc cquiv�lcnt tluid = ?50 pcf <br /> . ('ncl7icicnl of friction - 0.30 <br /> I'hc ;�hovc valucs ;�rc allowTblc and includc a (:�ctor of salety of at Ir.isl I.5. <br /> Latcrul E:�rlh Pressurc <br /> 7 hc roncrcte basement retaining walls should he desi�neJ to rcsist "at-rest" :;oil pressurc conditinns li <br /> as �h�_ walls will fx: tixcd at Uic top and not Ircc lo yicld latcrally al Ic�.et 0.1 perccnt of Ihcin c�ight. <br /> "flic w:ill: should bc dcsi�.�ncd usin�; and cyuivalent fluid pressurc of 50 pounds per cuhic foot (pcn. <br /> Thc. h:iscn;cnt walls �:houW usc cilhcr a full hcighl chimney dnin or appmvcd drainr�gc hoards <br /> BGC, pllc 14' -i7 209"' Avenue N[ Woadinville, WA 98077 (425) 273-506'l. �� �j(=1 <br /> �� � . <br /> �• <br />