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Cotter Corporation PROCEDURE Number: 3-4 <br />Schwartzwalder Mine Page: 6 of 5 <br />Golden, Colorado WATER MONITORING Revision: 6 <br />Date: 01/10/2008 <br />MINE REFILL WATER SAMPLES <br />• One sample is collected from the Main Production shaft on a quarterly basis. <br />• An extended analytical suite is used for all mine refill water samples and includes the 30 <br />parameters, listed below. Sample size is 1 gallon raw. <br />MAJOR IONS LDL <br />Alkalinity, Total as CaC03 1.0 mg/L <br />Bicarbonate as HCO3 1.0 mg/L <br />Calcium 0.10 mg/L <br />Chloride 3.0 mg/L <br />COD <br />Magnesium 0.10 mg/L <br />Potassium 0.10 mg/L <br />Sodium 0.10 mg/L <br />Sulfate 5.0 mg/L <br />PHYSICAL PROPERTIES LDL <br />pH <br />Total Dissolved Solids 10 mg/L <br />Total Suspended Solids <br />METALS TOTAL AND DISSOLVED LDL METALS DISS. ONLY LDL <br />Aluminum 0.20 mg/L Molybdenum 0.005 mg/L <br />Antimony 0.001 mg/L Uranium 0.0002 mg/L <br />Boron <br />Copper 0.005 mg/L METALS TOTAL ONLY <br />Fluoride Phosphorus 0.10 mg/L <br />Manganese 0.01 mg/L <br />Silver 0.001 mg/L ORGANICS <br />Iron 0.03 mg/L Cyanide (weak acid dissociable) <br />Thallium 0.001 mg/L METALS TRIVALENT LDL <br />Zinc 0.005 mg/L Ferric Iron 0.30 mg/L <br />RADIONUCLIDES DISSOLVED LDL Chromium (trivalent & hexavalent) <br />Radium 226 + 228 0.2 pCi/L <br />•