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'~-~2-:; l i:41.id .E~'~i S.~t~ K. DBPlYER ~~'? <br /> <br />Docsmber 7, 1993 <br />SRK Project No. 147ZS <br />Battle Mountain hold <br />P.O. Box 310 <br />Sea Luis, CO 81152-0310 <br />Attn: Mr. Mike Young <br />~TEF~EN ROBERTSON .4ND KIRSTEN <br />Consulting engineers and Scientists <br />1ltE: 9AN LU75 PRQJI~CT, PR.45E II RAL1E Jk CONi9TRUCTION • SUPPLFaVIENTAL <br />PEil1~ABIli.1TY TESTS <br />Dear Ml1oo: <br />FatClosrd are the nsult9 of labwratory permeability testing of the drainage blanket (rnateriat Type <br />2) and soil liner (material Type 311ayers. These tests were conducted to supplement the routine <br />QA/QC coaforraance sample te+Hng. Also enclt>sed are the grain size analyses for the samples <br />as prepared fns the permeability tests. Depending on the permeability mold utilized, the material <br />Wnusl~d of the minus 'li inch or 'h Inch oompoacnt of the bulk saraplc a, per ASTM <br />rtacottrmeadatione for maximum grair- size. Retttoval of this oversized maurial has tittle or no <br />tffect on the achtal permeability. <br />Samples DH-3 and DH•4 represent drainage blanket maurial obtained from epecilfic locationc <br />o! completed platxment. The insitu density and moisture txmtettl at the enact sample location <br />was obtained by nuclear density gauge immediately prior W sample collection. 1'he samples <br />were prepared to duplicate field conditions for the permeability tests. Sampu DH-3 was <br />obtained from Acre B in an ages known to contain an excessive fines content crud the sample <br />contained 41.2 96 gassing the No. 200 sieve. Sample AC-49 is a representative sample of the <br />drainage blanket material prodtttxd by the screening plant which was subse+gtlently placed in <br />Atae 44. No specific insitu density measutranertts are associated with this sample. <br />Laboratory, falling head, permeability test results for DH-3, DH-4 and AC-49 aveaaged S.7 x <br />]0's, 1.S x 10+ tm/sec and 1.5 x 10' cm/sac, sesgeetively, To date, laboratory permeability <br />testing of the tiralnege blanloet material (t0 testa) has resulted in hydraulic couduct[vitiw of 2.5 <br />x 10"' cal/sa to 1.5 x l0a em/sec, and as average of 7 x l0'' cm/sec, This includes two <br />samples, DH-3 and DH•1 which failed w meet the gradation specifications (greater than 35 <br />percent minus No. 20D sieve) sad S samples which were prepared at densities which are higher <br />than typiapy measured in the field. <br />stel~en Robertson and K!rsten IU.S.), Inc. <br />3232 SOllth Vance Street: Lakewcx1. COWrado 80227, U.S.A. <br />?ei. (303) 985.1333 Facsimile t503) 980-99d' <br />Other OttICeS In: U.S.A.. Canada, Un!tec Klnddoni aril Ali ic;a <br />