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, t <br /> Mwy-VN-ytl V9:02P t.npGnUYCo Enytnoorin� Tr�c: 300^ 307-0694 V_OY <br /> pD101.Sl17W.Iyp S uf 7 <br /> feet thick end was formed by weathering oi surf�ce soils. Tlteae dqxrsi6i uo tyPically <br /> ovcrlain by �cumulatioru o[aofl, arg�nk•rfch material whicli fuinro tup�ofl. <br /> • Vashon �e Ad��uce 9�nd - '1'hie m�terial urxlarlip Iho lawc �ur�lcitl x�il� aid <br /> conai�tcd of modium dcnx, ali�htly silty in placw, Fne w mullum �ancl wllh some <br /> gravel. The �end wa+ overcidden hr ehe 6��eia1 advnnce of the Va�lan ice �hcet whkh <br /> rwulted {n a compacted soil, howevu, lhe wp kv� ket of thb �and hu typkally ban <br /> wwtlxrcd to a luoxr �ondition (Alluvfum). 'R�i� asnd hu m��Je�ate pc�rmwbiUty <br /> characterindca. <br /> Ground Water <br /> No aurfece wxtcr wa.r vi�it�t� at the time of our field wvrk, 6owcva, it b possible tl�at same scqrrgc <br /> of grnmal weicr may cKcur in thc lawer pert uf dic send fullowing periixla uf rain. <br /> Conclusions and Racomm�ndatlons <br /> It ia our opinion that a slahlc� keycd anJ be�hed re�d fill can be corotructed on Iliis sila. Ow <br /> enRineering uecsame�t lndic�tea ehnt the site Wils will 66 oaP�blc of providi�g auit�blC sVpPOf1 vf <br /> ihe to�d fill. Pruper site preperation, snding, filling end comp�ction will hc ncccasuy. <br /> Slte Preparatlon <br /> Sile prepazution of Uu plamted access road and the erea tu �eceivc fitl .rhuuld incl�xle removal of al) <br /> trew, brosh, debria and a�y other deleterioua m�teriel. Addltbnally, thc upper orgenk rop�oll <br /> ahrnild bc rcmovcd and thc rcmainin6 roots �rubbed. 'I'hi+ arw i+ appmximately dellneatcJ ��n tf�e <br /> Sltr Plan, INpure 1. <br /> Keying and Benching <br /> 5ince Ftll ia to be plsecd on a al�c, thc bax of tlro fill shvuld be ticd to firm, atAblC iLLb]VII by <br /> approprla� keying and benr,hing. A typkal etou-�ccNon for kcying u�N! benchin6 ia ahown on the <br /> Benchtng of Cnmpar.red Ffll Slopes, Flgu►e 2. The keyvr�y wfll act a+ � ahcar key w ombcd the be <br /> of the ncw fill into the hillside and will providp d►1iipA6e to �mptvvc thc �LLhili�y of Ihe lue. ThC <br /> kcyway for thia hiltaidc �II ah�uld hc 5 fcct widc �ncl cut into thc lowor, dcnx asi�d. 'll�e kcywry <br /> �hould bc fillcd with G-inch cnuhcd quarry rock with the tov Rngied as shown in Figw'e 3. A Jreln <br /> pipe ii not neccssary in the boltom of the key ns any ground wnoer fa CnyevleJ W (n(1ltralc fata the <br /> Ivwer sends. C.evel benches would Ihen he cul I�orlaontnlly accoaa thc hill, foliowing the c�mur.�ra af <br /> the �Ic�e. No a�xcific widU� i� rcyulreJ fvr Ihe bcnc:hcs, although ther ue uxually a fow �ce� wiclMf <br /> Ihna thc ck�rc.r bcinR uaed w cut them. <br /> 5tructural FIII <br /> After completion of tlie key end Filling wilh cruahed rock, the benchea uu trpiq�lr �ul atnl UtG GYI <br /> eoil ix rolled arer nncl r.ompected onto thc nent Ivwet ben�:h. Addttbnal 9uucluial fill will bt <br /> reyuired to build tlie slope, StntcNral Fill is deCncd e� non-c�repniC soil, ecccptablc to lht <br /> C�entechnicnl Engineor, pl�ced la mNcimum S inch luose lifts with e�ch IiR bCing compactul to <br />