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1 <br />' ANALYTICAL PROCEDURES <br />' On November 22, 1983, Bookcliffs received seven samples of mine waste <br />material from the Twentymile Coal Company for analysis by column leach <br />' extraction. Five of the samples were received in the form of a 2}-inch <br />core. The remaining two samples, Waste Coal and Waste Rock Samples 1 & <br />2, were received in an aggregate form with material size ranging from <br />100 mm to less than 0.5 mm. <br />The seven samples were logged into the lab and assigned a unique <br />laboratory number. Table 1, Sample Identification, lists these samples <br />and their assigned laboratory number. Also included in Table 1 are two <br /> duplicates made by Bookcliffs from the following two samples: <br />t ' <br />' <br /> • Foidel Creek Mine Core 001-83-66, -147.7 <br />, Coal <br />143.2 <br />' • Foidel Creek Mine Core 001-83-66, 149.3'-154.6', Floor <br /> Sample Pre paration <br />' <br /> The seven leachate samples (83-5246-L thru 83-5252-L) were air-dried for <br /> 72 hours. The two types of materials (core and aggregate) were <br /> prepared f or analysis using the following m ethods: <br />' <br /> • Crushing of Core Material <br />' • Screening of Aggregate Material <br /> The five core samples were crushed to 8 mm and thoroughly mixed. Two <br />' l <br />f f <br />l <br />d d f <br />t <br /> the 8 mm <br />sp <br />its o or <br />samp <br />e were ma <br />e; one ure <br />storage an <br />u <br /> reference, the other for analysis. The samples for analysis were <br />' crushed to minus 0.5 mm. <br />' The two aggregate sam ples were screened through a series of stainless <br /> steel sieves using a mechanical sieve shaker. The following sizes of <br />' material were obtained by the screening process: <br />i t <br />' -2 <br />