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ES7ERN ENGINEERS, INC. <br />octobcr 6, 190 RECL-1VED <br />liiyhl~lnd Engineering <br />P.O. Lox 631 <br />Delta, CO 81416 <br />A'PTN: h1r. F. Uan ltinchart <br />r <br />Mr. Rinehart: <br />I am enclosing the results of a series of direct shear tests <br />which tae ran on a sample which you subinittcd to us in July, 1980. <br />As you well Y.now, tae had a difficult time obtaining consistent re- <br />sults running these samples at optimum moisture due to the mois- <br />ture sensitive nature of the clay constituents. In order to main- <br />tain consistent moisture during testing we finally had to run satu- <br />rated samples. 9'hc: results of these tests are the ones indicated <br />on the enclosed Idohr's evelopc. These values will be conservative <br />if used in the analysis of slopes which remain under optimum or <br />less moisture cunditions. Our other option to provide you with <br />the necessary data would have been to perLorm consolidated, drained <br />(or undrained with pore pressure measurements), triaxial tests which <br />,~,ould have been much more costly and would have entailed more time. <br />The direct shear results are for consolidated, drained tests. Er- <br />ratic results which we initially obtained and which we gave to you <br />verbally are as follows: <br />Confining Pressure Shear Strength <br />1000 PSF 3500 PSF <br />1000 PSF 3300 PSF <br />2000 PSF 2800 PSF <br />The soil tested consisted of a relatively highly plastic clay <br />intermixed with coarse sand and fine gravel Lrayments which resemble <br />,,. ... burnt clay. Tlie samples were molded at about 108 PCF and 17.38 mois- <br />ture. -- <br />If you have any questions, please call me. <br />Submitted by: <br />L9ESTERN li[JGINEERS,~ IAN\C. <br />~~ ~ 1 <br />Bruce D. Marvin, P.F.. <br />BD19: slv <br />7lSI)lllll'A)'G,SSU l'. (l.H(/1 Sll <br /> <br />F~GE D. G1q~/i., <br />~ ~~G15 T(~~{~G •/ <br />• ~ a 14;86 u <br />~_~ n C <br />~j <br />9j~ s;n,an~ `~ ~.. <br />GF C G`ci <br />(a: A.^!l1 /I/h'( I!O.\', (,)l (1R.ll ,(1 J750? !'l IOh'f ?~i7~5707 <br />