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Ue1u,c with proposed road tiertions (Fabr•uary, 1x971 I~a~.e~~ npnn <br />tl,.- general criteria o]' this rep~rl. The artua] stability ~alcu- <br />Lotions i.ruvi~led with this report iti i~a~ed upon the muss r.~irr•me <br />case of thPSe 1'U3d sections, <br />1•'II•h BENCH CNG <br />Due to construction on tiie slopes, al l <br />filL~ must be benched into Lhe native soils. For Inirpu5es of <br />r.aLrulation, several assumptions have been made, ~.hi:h will <br />probably require modification during cons t.rucriuu. The actual <br />cut face of each bench is not certicaL but has a slope of approx- <br />imately 1:2.5 Ifi:1'). The ben~:hes have been sized approximately <br />lv feet wide, with each step up to 8 feet }rigti, based upon sizes <br />• of construction equipment and problems of working in very narrow <br />arras. these benc}ies will be cut into the colluvial soils and <br />will probably be completed in the more competent rock members of <br />the Bowie Formation. If the Bowie Formation is encountered at <br />rather shallow depths, the widths of the benches can be decreased <br />significantly and the number of benches increased, as reRuired. <br />In areas which will have less than 5 <br />feet of fill and if the toe areas are judged to be relatively <br />strong and stable, the fill face could be steepened to 1:2 IH:V1, <br />using rock buttressed type facing, possibly combined with mechan- <br />ical reinforcing. The actual heights of fill for these steepened <br />faces will depend on actual on site conditions, but will probably <br />be limited to the range of 10 to 15 feet. <br />l0 <br />