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• O�e-30-97 17:21 A[SI K1rkland <br /> • 425a?7E424 P.02 <br /> + /,. <br /> t <br /> Optioa 1 —Stroctnral Fill Placed on Kryed a�d Beic�cd Sbpe <br /> Stiuchaal fiU ia defuxd�a non-organic soil,uceptablc w the Qeotahoical enQineer,Placcd in <br /> horizoatal,maximum 8-iach thick loose litia with each IiQ beina compected to at teast 95'/e uf <br /> the modified Proctor m�ximum deusiry using ASTM:D 1557 ar lhc stendard. in order tu <br /> enbar�;e drauu�e of the filt soils,we rccommend that stnxwrul fill pLced u thc b�se�i thc fi11 <br /> sa:Gon,elong thc axis of thc nvinr�,oonsist of 2-iach or lugcr crushed mck. 'I'he facc of the (iU <br /> section should bc sloped u no steeper than 2H:i V(Horizontal:Verticd), q sohemutio diygram <br /> of st�ucbu�al6tt pl�ceJ on a keyal md:xnched slope is shown in 1'i�ure 1. In the event�hat the <br /> fill arws are not be uscd w su�on suuctures such as houses or guaQes, thc minimym <br /> compaction speciScadon for tl�c strucuaal fill could lx rcdueai to 9056 of the above standard. <br /> Option 2—Geoerid Reinforeed Struetunl Ffll Pl�ced oa Krycd and Benchcd Slope <br /> Gcogrid rcinl'orccment iil'structural fill LL�ine very stmnQ, plastic aco�rid matctia! would ellow <br /> the slope of the fue of thc fill ucliun to be steepened to as much as 1H:1V. A schemstic <br /> diagram of geogrid reinforced stnu;wrel fill placai on a kcyed and henchcd slope is shown in <br /> Figorc Z, <br /> Optiod 3—Strrctun!Fill in Conju�ctioo wit6 GcoRrid Reintorced Stnctonl Fill wd Toc <br /> • Sapport <br /> Option 3 consisLc of rcinforcing cmly a portion of thr IiU scctioa using eeaQrid, gy snppprting <br /> the toe of the geogrid rcinforced section of fill wilh a modular block wa11 or proteet�a it w,1W s <br /> r�xkery, the slope nl'the facc of the gaigrid reinforced fill seclion coutd be steep�nal a nc�r�y <br /> vcrtical, as shown in Figure 3. The hcisht of geogrid reinFoncd stn�etwal fiU ple�cd behind a <br /> rockery would be limital to a maximum of 1A feet. 1'he hei�ht of lhe muo�ular block wall is <br /> °1rt�Y �miced. The tacc of the aon-rcinforced sWetural Bp would be limited W a slope of <br /> kss than 21I:1 V. The walls could be placnd at thc wp or middle of the fill section and not jun <br /> the bottom as shown in Figure 3. <br /> Ylease nou that thc rccommendations and figures pnsented in this letter are ody conceptuW, <br /> Prior to pmparation of a finat design, wc recommrnd that exploration be conducud within d�e <br /> Pi'aP��d 5l1 areas tu coNimn the subswface �rondidoat iufentd from crur previous study. <br /> Additionaf c:onsiderations for firul cirxian of the fill seetions im;lude ensurinY that placemrn� of <br /> fill does not encr,mch into thc sctbstk Iimits alony lhe East fork of!'owder Mill Creek and en <br /> aunssment of thc}wuntial for thr c,veek cham►c1 to mewder from in��course. <br /> DEC 30 '37 »; 10 <br /> 4258275424 PqGE.002 <br />