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<br /> analysis. The filter cake was rinsed with 250 grams of fresh <br /> water per 1000 grams of solids. The washed concentrate solids <br /> were recombined with the flotation tails and packaged for <br /> shipment to the engineering consultant's laboratory. <br />1 <br /> D.6.2.1 Geotechnical Characteristics <br /> <br /> A geotechnical laboratory testing program <br /> consisting principally of classification type testing <br />t has been completed on the tailings. The results of this <br /> testing program are included in Appendix D. The tailings <br /> contain approximately 20 percent by weight ~~f fine sand- <br /> sized particles with the remainder classifying as silt. <br />' The tailings are non-plastic and have a specific gravity <br /> ranging from 2.13 to 2.77. A direct shear test conducted <br /> on the tailings revealed an internal effective stress <br /> friction angle of approximately 39 degrees. <br />t D.6.2.2 Geochemical Characteristics <br />The geochemical testing program for the tailings <br />consists of the following test series: <br />1. Acidification/neutralization p~~tentials; <br />2. Leachability; <br />3. EP toxicity; and <br />4. Humidity cell testing. <br />Three different tailings samples were tested; <br />' tailings liquid, tailings solids, and tailings solids, <br />which had been rinsed to a stable pH as Dart of the <br />' sample preparation. The rinsing was done to try to <br />eliminate any influences of pH altering chemicals used <br />in the milling process. <br />' D-36 (Revised 4/20/89) <br />