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composed of tielPCiPd Sandy Gravel & Cobble Colluvium and Alluvium <br />GM (Soil 'Type 1) or Mechanically reinforced fill slopes composed <br />of Clayey Colluvium GC' (Soil Type 21. it was found this st E•rper <br />fill slope, 20 feel. high, cr•eat.ed the critical condition of <br />failure in the native colluvium (Soil Type 21. <br />Due to space limi tat runs, it ma }~ 1~~ <br />desirable t.o over excavate the cut slopes and fill back will, a <br />mechanically reinforced earth buttress or• a boulder huttr~~s. <br />Such a buttress fill could he placed with u face slope of 1:2 <br />(H:l'1, assuming the total height is lass than 12 feet, the but- <br />tress fill is relatively frrc draining (Sandy Grave] & ~'obh]e <br />Colluvium and A1lucium GM (Soil Type 111 and no shallow slope <br /> failur•eti art found in the colluvium Wh1Ch is to be huttressa•~l. <br /> It is reco mmended the cut slopes in [he <br />• Shaley or Carbonaceous Portions of the Bowie Formation Ihedro~:~l•.1 <br /> he Limited to 1.5:1 IH:V1. "luck of the Bowie Formation cart <br /> support. slopes steeper than this tut, significant lung term <br /> problems of slope ra~ e.ling and erosion are anticipated. ainc~ <br /> the Bowie Formation is quite Fractured and very Str,rtifrP~i, it is <br /> possible that blocks of sandstone or siltstone m:,y i,~romr ,1P- <br /> tached and travel down the slope. <br />For L,nrposes ~rf Initial ko„,i ~• ~. i i•..~: <br />Design, it has been assumed tl~ut. cuts will be wiuinu~e•t .,i,.i iil~:. <br />will be ma~.imired. [t. is fart.her assumed rh.,t must fill +.r11 b.: <br />imported, probably from the tiew t'o:rl Na tP .+rr-.,. lu grucraf, <br />approximately 1/3 of the ru:ul cect.ion was assumed to h,~ ~.ithiu <br />the cut area amt appro~iwa Le•Le 2/3 of the road srct inn rs to ue <br />• within the fill ru•ea. `Ir. hill Ralar., F'. E., cupplred Li n.oln <br />9 <br />