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Gcotcchnical Engincering Recommcndations <br /> Prom a gcolcchnical enginecring standpoint, the property will he suit�zbic for dcvelopment of a <br /> single family residencc without having a significant impact on 1hc local environment. 7he <br /> bearing stratum of inedium densc to dcnse with cicpth, advancc outwash sand and gravcl <br /> scduncnts will providc suitablc foundation support for the planncd swctwcs. Thc bcaring <br /> stratum �+�as shallow and sprrad fooungs may be used for foundation suppoct of the planncd <br /> residence. "Ilie ncar surface seciiments will also provide support for the access drive. lhc <br /> planned retaining walls will be keyed and benched into the existing slope sediments to crcale a <br /> suilablc building pad for thc single family residcncc. <br /> Sitc 1'rc�aration <br /> Tlie existing fill soil and ilic org:inic rich topsoil should be rcmoved from all roaclrcirive�4�ay and <br /> foundation an�as. 71�ese materials are not suitable tor u5e in swctural fills and any excess <br /> matcrial that will not bc part of futurc I:uidscaping plans should bc removcd from Uic sitc. <br /> 'l�opsoil that will bc m-uscd on sitc shoufd bc stockpilcd away on sitc bc protccicd from crosion <br /> w�th plastic sheeting. <br /> Pcrmanent cut or swctural fill slo�xs should M: limited to a m:iximum inclination of 211:1 V. <br /> Temporary cut slopes for foundations, rockcrics or utility trench installation arc the <br /> responsibiliry of[hc contractor. I�or estimating purposes, temporary cut slopes in 1he densc <br /> advancc outwash sand should remain stablc at 1 H:l V sloEx; inclinations during construction. <br /> Tl�e urper topwil and wcailicr�d lodgement till should bc sloped back to at le.ist a 2li:l V <br /> inclination. <br /> Structural Fill <br /> Grading plans for lhe project havc not bcen finaliud at thc time of lhis rcEmrt. Swctur.sl fill <br /> will be neccssary for consUvcGon of the acccss drivc and as part of the MSE rc43ining wall <br /> n�essary for support of the planned rcsidcnca Any 611 soil to be placed in drivcway are:3s ur <br /> under structures should be placed and compacled in accordance with ilic recommendations <br /> containcd in Uus scction af tl�c rcport. <br /> All cxisting till and org:.nic soil should bc removccl from ar�as to rcccivc swctural fill. I.00sc <br /> surfacc soil disturbed due to the stripping proccss should be, compactcd to a fimi non-yielding <br /> conditinn �;rior �o placinz stnutunl fill. 71te prepaired sub�;nde should he verified that it ready <br /> to nccivc structural fill hy thc gcotcchnical enginccr. Non-orgnnic fill soil should bc placcd in <br /> U�in lifls, not to excecd 10 inches, on horizon��l plancs. Filling lifls on non-horizontal planes <br /> should bc avoidcd. Fach liR of 611 should bc:com�ctccl to a minimwn of 95 perccnt of thc <br /> moditicd Pmctor maximum dry density per ASTM:D-1557. The structur.il fill pad should <br /> cxtend a minimum of thrce fect bcyond the edge oCa swctwe or driveway before sloping to <br /> match thc cxisling grades. <br /> Placemcnt an�# compac4on of the structural fill should be monitorecl by a competcnt field <br /> tcchnician. In situ density tcsting should be performed to vcrify proper a�mpaction of thc fill <br /> soil. <br /> BGC, pllc 14267 209`h Avcnue NI;, Woodinvillc, WA 98077 (42�) 273-5062 <br />