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• ~ Based on the granular nature of the material in the pile today, it 1~ <br />With respect to chemical composition, the waste rocY. material is <br />almost always described as calcareous, and there is only occasional <br />identification of disseminated pyrite. The roc}: materials have <br />been tested for chemical composition, and the results reverted ir. <br />Appendix 3.3-1. The results of this testing are summarized in <br />Table 1. This information indicates ghat the rock materials are <br />not combustible. Further, the waste rock does not appear to have <br />the potential to produce acid leachate: pyrite levels are <br />"~' considerably too low, and there appears to be a large <br />_ neutralization potential, both from its description as generally <br />- "calcareous", and from 'rhe high leach Ph values. The last material <br />____. is coal: note the high combustible solids, and the low pyrite <br />content. <br />~.. Table 1 - 6ignifieant chemical characteristics o: waste roeY. <br />~;...' <br />appears that there Is no plasticity. The strength is therefore <br />expected to be a result of frictional resistance. Tests of similar ~ <br />material in direct and triaxial shear performed by Chen and <br />:Associates (Soil and Geological Znvestigation for Proposed <br />Overburden Waste Piles and Sedimentat' -'m Ring Mines, New <br />Castle, Colorado, dated Mar , 1982, Table A, p. 1 uced an <br />'.'effective stress frict' angle of 28~°, with no cohesion. This <br />value seems consistent w - id be <br />expected in a granular material. <br />HOLE SAMPLE TOTA:. PYRITE :,EACH <br />' DEPTH COMBUS^_' CONTENT WATER <br /> (feet) SOLIDS pH <br />_..,_ SR-3.75 ?(~1) 14$ 0.34$ S.1 <br />• SR-3.75 ?(#2) 13$ 0.29$ 8.0 <br />__ SR-3 .75 ? (#`3 ) 10$ 0.09$ 8 . 5 <br />SR-SA 998 14$ 0.30$ 7.1 <br />SR-8A 1041 15$ 0.40$ 7.7 <br />SR-8A 1077 13$ 0.10$ 7.6 <br />SR-7 (coal) 1448 °1$ C.03$ NA <br />".2 Fo•~ndation Materia~ <br />The foundation material in the vicinity of }she Lads is made up cf <br />colluvial material resulting from mass wasting of `..he hocbacY. <br />above. Two typical geological seC ions throuch }..he prciect area <br />are presented on Figure 5.2-2 and 5.2-3 in the main repot. <br />The grainsize of the materials was also sampled, and is presented <br />as Pit l..in Figure 1. The foundation material crainsize ranges <br />_. __ ~rom si'-~ to house size, and is very heterogeneous. However the <br />~..~_ , - . <br />` ~ _- dominant size range for ~..hese materials is in the sand range, wi`..h <br />_ hC-'iaa 8ro~ra Coasultaat= -5- 1155/°OOE:1 <br />