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Acz • • ACZ lnbara[ories, lnr. 30400 Downhill Drive Lab Sample ID Client Sample ID : L19689-01 : 98-B,WG,WB Steamboat Springs, CO 80487 Client Project ID : 2108 (800) 334-5493 ACZ Report ID : RG74905 Homestake Mining Company Date Sampled : 8/4/98 11:05 650 California St. Date Received : 8/5/98 San Francisco, CA 94108 Date Reported : 8/20/98 Alan Cox cc: Scott Randall Sample Matrix : Surface Water Metals Analysis Aluminum, total M200 7 ICP U mg/L 0.03 0.2 8/18/98 kr Arsenic, dissoh~ed M206.2 GFAA O.OI2 mg/L 0.001 0.005 8/19/98 jb Arsenic, total M206.2 GFAA 0.011 mg/L 0.001 0.005 B/11/98 jb Cadmium. dissolved M200.71CP 0.052 mg/L 0.003 0.02 B/12/98 kr Cadmium, total M200.71CP 0.052 mg/L 0.003 0.02 8/18/98 kr Copper, dissolved M200.7 ICP U mg/L 0.01 0.05 8/12/98 kr Copper. local M200 7 ICP U mg/L 0.01 0.05 8/18/98 kr Iron, dissolved M200.71CP U mg/L 0.01 0.05 8/12/98 kr Iron, toml M200.71CP U mg/L 0.01 005 8/18/98 kr Lead, dissolved M200.71CP U mg/L 0.04 0.2 8/12/98 kr Lead, total M200.71CP U mg/L 0.04 0.2 8/18/98 kr Manganese, dissolved M200.7 ICP 0.013 B mg/L 0.005 0.03 B/12/98 kr Manganese, total M200.7 ICP 0.012 B mg/L 0.005 0.03 8/18/98 kr • Mercury, dissolved M245.1 C'VAA U mg/L 0.0002 0.001 8/10/98 bg Mercury, total M245.1 CVAA U mglL 00002 0.001 8110198 bg Zinc, dissolved M200.7 ICP 12.10 mg/L 0.01 0.05 8/12/98 kr Zinc, total M200.7 ICP 11.90 mg/L 0.01 0.05 8/18/98 kr Metals Pre Total HoI Plate Digestion M7010 ICP 8/18/98 ms Total Hot Plate Digestion M3010 GFAA S/I 1/98 ms Wet Chemists Conductivity ~+25C M1201-Meter 817 umhos/cm I 10 8/7/98 sts pH (lab) MI50.1 - Elecvometric 6 I units 0.1 0.1 8/7/98 sts Residue, Filterable (TDS)(u)180C M160.1-Gravime0ic 710 mg/L 10 20 8/7/98 mh Residue, Non-Filterable (TS8) a 103-SC M160.2 -GravimeVic U mg/L 5 20 8/7/98 mh/cd Sulfate M375.3-Gravimeuic 390 mg/L 10 20 8/7/98 sts //~~~ Vice President ofOpera[ions: Ralph Poulsen