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• <br />Msrch 1992 Cos/ Rs/ass Plesficiry Resu/fs end Rs/afsd Stability /mp/icstiona ~ 1 <br />The stability analyses for the refuse pile indicated that the strength properties of the fine refuse material ue <br />dependent on the plasticity of the material (see main report). Thercforc, subsequent to submission of the <br />original stability report, a plan was developed and submitted to CMLRD to evaluate the plasticity of the fine <br />refuse through a sampling and tesritlg program. The proposed plan is described in Attachmem B. <br />Ten samples, irclutfing six samples of fine refuse from various locations on the refuse pile and four samples <br />talten directly from the belt dewarering press dischazge, were collected a~ tested. Locations for the refuse pile <br />samples arc shown on the [tarp presented az Attachment C-1, sample descriptions ue ircluded in Attachment <br />C-2, and laboramry analysis reports are presented in Attachment C-3. <br />The results of sampling and testing of fine refuse material from both the existing refuse pile and the preparation <br />plant ue presented in Table C-l and shown on Figure C-l. The results indicate that the fine refuse material <br />is gererally a low phuticity material with plasticity indices of between 0 and 12. nth the exception of Sample <br />10A, all sample results fall below the A-lire (indicates organic comporcm of samples) az shown on Figure C-1. <br />Since it was not (mown whether the ammalous value was a result of different material ercouruered by the <br />mit3irlg operation or whether it was a testing error, it was recommended [haz the Attetberg 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 consistem with other test results. <br />Table C-1 <br />RESULTS OF ATTERBERG L~-~IITS TESTS <br />1I ,, <br />u <br />SauWk tn'•tioa Malcrial <br />Typc Lquid <br />Limn Plasc <br />Limi Plaaicny <br />Index USCS <br />Symbol <br />RetLx Pile, No.l, 2128/92 Fire Refux 73.6 29.1 1.3 MI/OL <br />Refuse Pile, No. 2, 2/28/92 Fire Refux 32.2 25.3 6.9 MUOL <br />Retlue Pile, No. 3, 2/28192 F'me Re(ux 32.1 25.3 6.8 MIIOL <br />Refuse Pik, No. 4, 2/7BN2 Fns Refux 28.6 28.1 0.5 MLOL <br />Refuse Pile, No. S, 2/28192 Fire Refux 35.6 30.8 4.8 ML/OL <br />Rea~x Pile, No. 6, 288/92 Fns Refux 28.5 30.9 NP MUOL <br />Beh Ras, No. 7, 2128/92 Fire Refux 29.7 36.4 NP MiIOL <br />Ikh Rw, No. 6, 2128/92 Fire Refux 37.5 28.8 8.7 MI/OL <br />Belt Pass No. 9, 7/25192 Fire RePox 41.8 47.4 NP ML/OL <br />Beh Rea No. IOA, 3/25192 Fine Refux 41.9 24.1 17.8 CL <br />Ben Pas No. IOB, 3I2S192 Fire Refus 41.9 30.0 11.9 MVOL <br />Naes: 1) Santpka obuined by SaMCsld ssfl <br />2) Sampka teskd by Wyoming Amlyliul laboratoris, Inc. <br />• <br />A review of the above data indicates that all of the fine refuse is an organic silt or an organic siltclay of low <br />plasticity. <br />~,..,y,prom+s <br />~~~~ <br />