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Aug-21-96 06:39A Lincoln DeVore of Grd Jct 970-242-1561 P•12 <br />below the present, ernbnnkmerrt crest, therefore decreasing 'the soil <br />permenbilit5'. It. is further believed the soil moisture has <br />increased to near saturation in some strata, toward the exterior <br />toe of the embankment, causing heaving of the underlying cla>•- <br />stones to be severe and probably at a maximum heneatlr the embernk- <br />ment. and particularly 1.he interior toe and at. a minimum at. ttre <br />exterior toe. <br />It is believed the approximate surface <br />of Che expansive claystones and the base of the constr,ictecl <br />embankment has keen pushed up and, when looked at in r.ross sec- <br />t.i.on, would have a slightly upward bower! appenrancr. It is <br />believed this upward bowed appearance, part.ictrlarl}- of the lower <br />embankment surface, has been manifested within the emt,nnkment. as <br />a tension crack, approximately running the length of the embar,l:- <br />ment. There may be construction factors, primarily major soil <br />haul and placement routes along the embankment, which have corr- <br />Cributed to a weaker zone along the embankment access. <br />It is also believed that as the soil <br />below the base of t},e embankment stabilize from the original grid <br />environment to ti:e new environment of near saturation of the soil <br />:ind ciaystones, that soil and claystone heaving will be completed <br />and that future distortion or cracking of the embankment or• soil <br />adjacent to the embankment will probably not occur. <br />It must be emphasized that no obvious <br />r.a„ses for extensive cracking of the embankment could be found in <br />tt,e upper 8' to 10' of the exist.irrg embankment nor within the 8' <br />t.o 12' zone of either embankment or alluvial soils. The in-pla:~e <br />sail densities indir.ated a fairly wide range of compaction within <br />10 <br />