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March f 992 Coe/ Refuse A'ssticiry Rssults snd Related Stshiliry /mplicstans • 1 <br />• The stability analyses for the refuse pile indicated that the strength properties of the 6rc refuse material are <br />dependent on the plasticity of the material (sce main report). Therefore, subsequem m submission of the <br />original stability report, a plan was developed and submitted to CML1tD to evaluate the plasticity of the fine <br />refuse through a sampling and testing program. Tbe proposed plea is described in Attachment B. <br />Ten samples, iocluditlg six samples of floe refuse from various locations on the refuse pile a~ four samples <br />taken directly from the belt dewatering press dischazge, were collected and tested. Locations for the refuse pile <br />samples aze shown on the map presented as Attachmem C-l, sample descriptions are included in Attachmem <br />C-2, and laboratory analysis reports are presented in Attachmem C-3. <br />The results of sampling and testing of fine refuse material from both the existing reface pile ar3d the preparation <br />plant are presemed in Table C-1 and shown on Figure C-1. The results indicate that the fine refuse material <br />is gererally a low plasticity material with plasticity indices of between 0 and l2. nth the exception of Sample <br />10A, all sample results fall below the A-line (i~icates organic componem of samples) as shown on Figttre C-l. <br />Since it was not Icaown whether the anomalous value was a result of differem material ettcoutuered by the <br />mining operation or whether it was a testing error, it was recomme~ed that the At[erberg Limits Tests be <br />repeated on this sample. The results from the retest (Sample No. lOB) indicated testing error, with the actual <br />plasticity index value being consistent with other test results. <br />Table C-1 <br />RESULTS OF ATTERBERG LBNTTS TESTS <br />r <br />~~ <br />Sampk Lootion Material <br />Typo L'quid <br />Lima Nasic <br />Limn Rascay <br />Index USCS <br />Symbol <br />ReNx Pik, No.l, 2128/92 F~ Relhx 33.6 29.1 4.3 1~9JOL <br />Refux Pik, No. 2, 2!28/92 Fme Refux 32.2 15J 6.9 MLOL <br />RePox Pile, No. 7, 228192 Fme ltefux 32.1 75.3 6.8 MLOL <br />ReBtx Pik, No. 4, 2128/92 Fme Refux 28.6 28.1 0.3 MLOL <br />Refuse Pik, No. 3, 288/92 Fme Refuse 33.6 30.8 4.8 MUOL <br />Refux Pik, No. 6, 1128/92 Fme Refux 28.3 30.9 NP MLOL <br />Belt Ptcss, No. 7, 2/28/92 Fme Itelnx 29.7 36.0 NP 64/OL <br />Belt Ptess, No. 8, 228N2 F'tne Refux 77.3 28.8 8.7 MUOL <br />Bell Rena No. 9, 3175/92 Fme Refux 11.8 47.4 NP MUOL <br />Belt Bess No. IOA, 323/92 Fsae ltefux 41.9 24.1 17.8 CL <br />Bel[ Pass No. IOB, 3123!92 Fme Refux 41.9 30.0 11.9 MLOL <br />Naas: 1) Sa~ka obuurA by Southfield salt <br />2) Sampka ksed by Wyom'utg Analytical Laboratories, Irc. <br />• <br />A review of the above data indicates that all of the fine refuse is an organic silt or an organic silt~lay of low <br />pLlsticity. <br />~,--.w,.rum..e <br />awurt ~,a <br />