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PERMFILE109209
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PERMFILE109209
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Last modified
8/24/2016 10:01:51 PM
Creation date
11/24/2007 5:58:20 PM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981014
IBM Index Class Name
Permit File
Doc Date
12/11/2001
Doc Name
TR-14 continued
Section_Exhibit Name
EXHIBIT 15 Part 9a
Media Type
D
Archive
No
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Msrch /99I R'asficiry Eveluerion • 1 <br />• ACZ Inc. (ACZ) completed a geotechnirzl stability analysis of the ezistittg coal reftrx pile at the Energy Fuels <br />Coal Inc. (EFCI) Southfield Mice and submitted it to the Colorado Mined Land Reclamation Division (CMLRD) <br />on January 14, 1992. The CMLRD reviewed and approved the analysis, stipulating however, that EFCI complete <br />sampling a~ testirtg of refuse materials m determice material plasticity, evaluate test results relative to the stability <br />analysis, develop a plan to monitor refux plasticity, and establish criteria and designs for xlective placemem of <br />high plasticity rcfttx if indicated. <br />The following proposed evaluation plan reprexnts the initial step in addressirtg the CMLRD stipulations. Upon <br />completion of plasticity sampling, testing, evaluation, and development of the monitoring and placemem plans and <br />criteria, all relevam information, including [he 1988 and 1991/1992 stability evaluatioat will be cottsolidated, <br />organized and submitted to CMLRD in the form of a technical revision application. <br />1.0 PlastirJty Sampling turd Testing Plan <br />EFCI proposes to collect and test 8 to 12 refux samples to determice a reprexntative plasticity range for the coal <br />refuse materials previously and currently placed on the coal refux stockpile. Samples will be collected from both <br />the existing stockpile and the preparation plant fice refttsc discharge. <br />Approximately 6 to 8 refttx samples will be collected from the existing refttx stockpile. EFCI will collect samples <br />from various areas of the pile io order to obtain a good reprexntation of any potential variarces in material <br />consistency and characteristics. To the extent possible and in order to avoid redisturbance, samples will be taken <br />from areas which have not been topsoiled and reclaimed. If samples are collected in a previously topsoiled area, <br />special care will be taken to iasttre that the sample is collected below the topsoil replacemem horizon and to avoid <br />mixing topsoil materials with the sample. Approximately one quart samples will be collected at each sampling <br />• location and samples will be bagged, labelled and shipped directly to a qualified laboratory for testing. <br />Approximate sample locations will be Doted on a map, site specific conditions, including sampling depth, and <br />variations in refttx material color, composition or consistency, will be noted in a field book, each sample site will <br />be photographed for future reference, and the approximate time period during which the material was placed will <br />be noted if possible. <br />Approximately 2 to 4 refttx samples will be collected from the preparation plain fine refux discharge. The <br />primary purpox in collecting refux samples directly from the preparation plant 5ne refux discharge is to verify <br />consistency between plasticity test results for raw and in-place samples from the same time period. EFCI is <br />currently in the process of shifting production from the west main entries (Jack O'Lantero Seam) to the south sub- <br />mains (Red Arrow Seam). EFCI plans to obtain plain refttx samples both before and after this transition to <br />character've any variances in plasticity between refux from the two coal seams prexntly being mined. Plain <br />samples will be collected from the fine refux discharge, bagged, labelled a~ shipped direcdy to a qualified <br />laboratory for testing. To the extent possible, plain samples will be identified relative to the source area(s) for dte <br />corresponding coal production run. <br />Atterberg limit tests will be run on all samples to determine liquid limit, Plastic limit, and plasticity index. The <br />procedtves outlined in American Society for Testing and Materials (ASTM) Standard D~318 will be utilized for <br />limit testing. <br />Both the plastic and liquid limit tests utilize material at or slightly above natural moisture comem, which has been <br />screeced to produce a test sample of material passing a No. 40 standard sieve. For the liquid limit test, the sample <br />is molded into a flaz sample cup and a standardized tool is used to cut a groove in the sample. The sample cup <br />is then motmted on an impact bed which subjects the sample to 25 impact blows by dropping dte cup from a <br />specified height Dino the fixed impact bed. The liquid limit is the moisture comem at which dte sample deforms <br />with closure at the bottom of the groove under the influence of the repetitive impacts. Sample moisttue is adjusted <br />• by addition of water or drying and remixing until the liquid limit is clearly deficed, dten sample moisture at the <br />limit is determined by standardized methods. <br />r:~.~.twi~eeo`ad.vm <br />a,ry v' ~ <br />
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