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1 <br /> <br />I{ <br /> <br /> <br /> <br /> <br /> <br />1 <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />1 <br />The mudstone leachate is also slightly alkaline. Iron <br />appears to leach in small amounts from the mudstone. <br />The clay and pink gneiss leachate is also slightly <br />alkaline with the majority of trace elements below detection <br />limits. <br />The combined tailings waste rock material humidity cell <br />tests indicate that the combined material leachate is neutral <br />to slightly alkaline with no sulfide reactivity resulting in <br />acid production. During initial testing, the first week results <br />for the combined tailings and conglomerate material did not <br />appear to correspond to any data developed on the individual <br />material sample tests. These results are believed to be due <br />to 1 aboratory error. The test was rerun and the data presented <br />as explained in Appendix F.4. <br />D.3.4 Facility Construction <br />D.3.4.1 General <br />Each of the facilities will be constructed with distinct <br />50-ft benches. It is anticipated that the benches will be <br />constructed by end dumping to a maximum. of 50 f*. with slope <br />faces at their approximate angle of repose (about 1.5H:1V). <br />Each bench will include a 75-ft horizontal setback to maintain <br />a 3H:1V overall slope. Foundation preparation will consist of <br />the removal of vegetation and topsoil ahead of the advancing <br />waste rock fill. No additional special foundation preparation <br />is considered necessary. Upon completion of construction, the <br />disposal areas will be regraded to an approximate overall slope <br />of 3H:1V. A 15-ft bench, wide enough for a dozer, will be <br />maintained on each of the horizontal setbacks. <br />D-21 (Revised 4/20/89) <br />