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Historical Chemical Data <br />Harvey Gap Outlet-Above Mine-Chemical Parameters <br />Pazameters 1996 1997 1998 1999 2000 2001 <br />Chemical Parameters Avg Avg Avg Avg Avg Avg <br />pH 8.1 8.0 8.0 7.5 7.1 7.6 <br />Conductivity @ 25 C 55 289 415 460 434.00 561.00 <br />Alkalinity-CaC03 Total 172.60 181.66 171.49 187.84 152.32 168.40 <br />Solids, Dissolved 414.30 423.75 466.75 420.72 423.25 369.50 <br />SAR in Water 4. ] 9 0.33 0.45 <br />Iron 0.03 0.02 <br />Cations-Sum <br />Boron, Dissolved 0.00 0.00 0.00 0.00 0.00 0.02 <br />Calcium, Dissolved 64.70 70.95 41.70 42.20 60.65 105.80 <br />Magnesium, Dissolved 26.40 22.75 15.20 69.70 32.10 32.85 <br />Manganese 0.00 0.19 0.0] 0.11 0.05 0.00 <br />Potassium, Dissolved 2.00 1.75 3.00 1.17 1.53 1.96 <br />Sodium, Dissolved 7.20 4.89 8.25 30.39 9.03 14.65 <br />Anions <br />Bicarbonate-CaC03 172.80 181.66 171.49 187.84 152.32 168.40 <br />Carbonate-CaC03 0.00 0.00 0.00 0.00 0.00 <br />Floride 0.10 0.00 0.00 0.18 0.23 0.30 <br />Hydroxide-CaC03 0•~ <br />Sulfate 128.90 131.73 95.49 119.14 76.97 114.95 <br />~~ <br />Page 17 of 22 <br />