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MV Gold Mng . ID : APR 30 '96 20 :28 No .030 P .02 <br /> The Soil Liner Fill material meets the permeability specification of < 1x10d cm/sec. The test <br /> results are submitted as part of Attachment 1. Test results ranged from 5.7 x 107 to 6.3 x 10° <br /> cm/sec for the Soil Liner Fill compacted to 95 percent of standard Proctor and a moisture <br /> content of 3 percent dry of optimum. <br /> The material has a cation exchange ratio of 11.8 meq/100 gm, which demonstrates its non- <br /> expansive character. This is similar to the cation exchange ratios of the other two materials. <br /> The grain size distribution is only very slightly different than the two currently in the Technical <br /> Specifications. It is repeated from the Attachment in the following table. Only the percent <br /> passing the three smaller screens changes from the additional specification submitted on January <br /> 9, 1996. Slightly less may pass the A. #40, and //200 screens. The minimum plasticity index <br /> is slightly lower than accompanying the January 9 submission. Comparison to the 1994-5 Soil <br /> Liner Fill grain size distribution, this additional matrix still has more passing these three screeds <br /> (U4, N40, and #2O0). <br /> ADDRIONAL 1996 SOIL LINER F41 <br /> ORAIN-SIZE D&MISIMON <br /> Sieve Size Poroem Peuins <br /> 2-inch 100 <br /> 314 Inch 75.100 <br /> 3/8 Inch 70.100 <br /> #4 55-100 <br /> #40 40L40 <br /> #200 30,60 <br /> PI Is(mim) <br /> Effectively, this grain size distribution and PI, along with the other two grain size distributions <br /> in the Technical Specifications are beginning to describe a range in grain size distributions and <br /> plasticity limits that provide Soil Liner Fill that meets the design permeability criterion. <br /> The interface shear test produced acceptable results, that is, results were within the envelope of <br /> the range of cohesion and friction angles that provides pseudo-static factor of safety of 1.0 or <br /> higher. The tests with this third Soil Liner Fill material with the textured LLDPE (textured side <br /> down) material showed a residual cohesion of 2055 psf and an interface shear angle of 16e. <br /> This represents the Drain Cover Fill-LLDPE synthetic liner-Soil Liner Fill interface, whore the <br /> Soil Liner Fill is this additional material. With our letter of January 19, 1996, we submitted the <br /> results of interface shear that demonstrated cohesion of 410 psf and an internal friction angle of <br /> 18' for the Drain Cover Fill-HDPE Synthetic Liner-Soil Liner Fill interface (see Attachment 6 <br /> to that letter). This combination was shown to have a pseudo-static factor of safety of equal to <br /> or greater than 1.0. In our subsequent letter of February 12, 1996, we further demonstrated <br /> cohesion of 865 psf and an internal friction angle of 18e for the Drain Cover Fill-LLDPE <br /> Synthetic Liner-Soil Liner Fill interface. This also provided a pseudo-static safety factor of <br /> 2 <br />