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2.05.3(6)(c) <br />A geotechnical investigation was also conducted in the proposed <br />• underground development waste disposal site in the spring of 1980 <br />by Armstrong Engineers and Associates, inc. A copy of this imiestigation <br />is included as `/olume 4 of. 6. The purpose of the <br />investigation was to analyze the stability of the present refuse. <br />disposal area. <br />Five bulk samples of soil consisting of two unweathered refuse <br />samples, two overburden soil samples, and one sample of weathered <br />refuse were used in the analysis. <br />Results of the tests are as follows: <br />• <br />Atterberg Limits Results <br />Sample Li uid Plasticity Classification <br />Limit Index <br />Overburden #1 36.5 14.7 CL <br />Overburden R2 35.3 13.0 CI, <br />Refuse 38.4 4~on-Plastic -- <br />Weathered Refuse 33.0 8.0 b1L <br />a <br />Direct Shear Results <br />Sample ~ ~ <br />Overburden ql 18.4° 100 psf <br />Overburden t2 14.9° 200 psf <br />Refuse 18.4° 0 <br />Weathered Refuse 14.9° 100 psf <br />A cross section of the disposal area was analyzed in Section 2.05.3(9). <br />. Results of the analysis indicate that for this area, ';.Sh:ly slopes <br />REVISED Ptay 8, 1981 115 <br />