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Table 6 EPA Method 1312 Leach Tests: Comparison of Pre-Operational and <br />Lowey Impoundment Operational Data <br /> <br />PARAMETER PRE- <br />OPERATIONAL <br />TAILINGS OPERATIONAL TAILINGS - <br />LOWER IMPOUNDMENT <br />-----------Unrinsed---------- <br />October 1993 This Report <br /> Unrinsed Rinsed Min Max Min Ivlax <br />p11 7.6 7.1 6.2 7.0 7.6 3.9 <br />Conductivity 162 64 200 440 322 211 <br />A1lalinity 24 14 19 38 18 Z4 <br />Bicarbonate 29 17 23 46 22 29 <br />Cliloride ] 6 4 3 8 1.0 1.3 <br />Sulfate 30 12 ~ 62 149 66 114 <br />Total Cyanide 0.30 0.08 < 0.02 0.24 0.06 0.14 <br />WAD Cyanide 0.06 < 0.02 < 0.02 0.03 < 0.02 < 0.02 <br /> <br />Arsenic <0.05 <0.05 <O.US <U.05 <0.05 <0.05 <br />Barium <O.Of ~ <0.01 <0.0] 0.01 0.01 0.02 <br />Boron <0.05 ~ <0.05 <0.05 <0.05 <0.05 <0.05 <br />Cadmium <0.005 <0.005 <0.005 <0.005 ~ <0.005 <0.005 <br />Calcium 7.5 8.92 18 46 ~ 25.4 48.2 <br />Clu'omium <0.01 <O.OI <0.01 <0.01 ~ <0.01 <0.01 <br />Copper <0.01 <0.01 <0.01 <0.01 <0.01 <0.01 <br />Iron 0.16 0.09 < 0.03 0.10 < 0.03 0.04 <br />Lead < 0.05 < 0.05 < 0.05 < 0.05 ~ < 0.05 < 0.05 <br />Mercury 0.0008 0.0005 <0.0003 <0.0003 <0.0003 <0.0003 <br />Magnesium 0.36 0.45 0.1 0.6 0.3 0.6 <br />Manganese < 0.01 < 0.01' < 0.01 0.02 0.01 0.11 <br />Molybdenum <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <br />Nickel < 0.04 < 0.04 < 0.04 < 0,04 ~ < 0,04 < 0.04 <br />Potassium 2.4 1.04 6.3 15 11.0 27.5 <br />Selenium < 0.1 < 0.1 < 0.1 < 0.1 < 0.1 < 0.1 <br />Silver <0.01 <0.01 <0.01 0.05 <0.01 <0.01 <br />Zinc <0.01 <0.0J <0.01 <0.01 <0.01 <0.01 <br />values mrag/L, escep~ pH in s. u., Coaducivuy ui u5, r1lk:nliniry m mg CaC03eq./L <br />Geochimicn, Inc. 6 l6 Seplember, IY96 <br />