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Aug-21-96 06:36A L9ncoln DeVore of Grd Jct 970-242-1561 P.06 <br />(:1{NI:ItA I. (;F:OI.O(]Y AND Sl1ilSlJitKAl:ls' DESCRIPTION <br />Thr boologic mttt.e[•ir,ls rnruuntorr•,I undor• <br />Lhe site consist of a thick sequence of se<iimentat•y rocks, with <br />Ll,e lower portion of the Mesa Verde Formation and the upper <br />l,or•tion of the Mancos Shale Formation comprising the bedrock in <br />t.ltis general vicinity. The geologic and engineering properties of <br />thc~ mxterixls found in our 3 shallow explorntion bot•inys will he <br />discussed in ttre following sections. <br /> The soils on t.h.is site consist. of be- <br />tw•een 8 and 19 feel of embankment material placed ovet• the ver•}~ <br />weathered clays of the Mesa Verde Formation. The ACt4a1 t.hic•I:- <br />nc°ss of embankment is very difi'icult to determine from the explo- <br />ration borings. It is possible the embankment is between 8 and <br />10 f,~et in thickness and the lolls labeled as embankment on the <br />drill logs below 8 to 12 feet are very weathered, cl.a}•ry soils <br />wl,ir:lr are derived from in-situ weathering of the clery stones rrn.i <br />shales of the Mesa Verde Formation or are alluviAl/colluvial <br />soils. Tlie demarcation sltoc+n on the drill logs between the <br />embankment soil:; and the native subgrade was determined in part <br />b.• change in the drilling speed, a visual change in the cuttings <br />linct•exsed sand content) and the first appearance of "i,il,ing" <br />st.t•cr~tcrres in the recovered sc:i.l samples, in the zone designated <br />r1A [.1 ='e sccbg rade. <br />The mate.'iall utilized in the em6AnltmenL <br />a;~peat• to have been derived from the weathered s}rales and cl.a>•- <br />stones of Che !Jess Verde Formation and arr. ver;: ~imil.,r in cnlor• <br />