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" ~ MOR RISON-KNUDSEN COMPANY, INC. <br />. Mr. Cass Legal ~ <br />October 21, 1981 <br />Page 3 <br />rainfall, the precipitation is likely to run off the northeast portion, but <br />on the southwest portion infiltration would be expected. <br />o a e expected would be some dep€;~t,..below =the top~:;o1f~t+i~d o <br />or,~;of:. t e~;s.poil..p~ As the top of this part-of the pi e corresponds <br />closely to the elevation of the phreatic surface required to reduce the <br />factor of safety to 1 .5, the likelihood of its occurring is believed to 6e <br />remote. Because of the steeper, albeit lower slopes along the southwest <br />face, if such a high phreatic surface were to occur, seepage from the slope <br />would be expected which, as previously mentioned, reportedly does not oc- <br />cur. <br />e bo'~- ri~ •~e~ ~be.,s~ePh~t~-hax,even;in~:.;.Uhe event of the.~~oc ~ c <br />e,~y~l'y`,`dr4aogic conditions, the factdr of safety of tfie s o <br />e~hy to fall below 1.5. If there are any questions con',cerni g.~t a ~~co <br />f~•~tr'its~' add'en"dum, please cbnta:cL'"R!i's+~"°" <br />Very truly yours, <br />_ ~ ._. <br />Oavid A. O'Day ' <br />Principal Geotechnical Engineer <br />M133 <br />f l i., i:u, I~~ i,~i'~~ .j~ <br />