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• <br />• <br />Cotter Corporation PROCEDURE Number: 3-4 <br />Schwartzwalder Mine Page: 7 of 7 <br />Golden, Colorado WATER MONITORING Revision: 7 <br />Date: 04/15/2010 <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 38 <br />parameters listed below. Sample size is 1 gallon raw. <br />MA30R IONS LDL <br />Alkalinity, Total as CaC03 1.0 mg/L Calcium <br />Bicarbonate as HCO3 1.0 mg/L Magnesium <br />Chloride 3.0 mg/L Sodium <br />Sulfate 5.0 mg/L Potassium <br />0.1 mg/L <br />0.1 mg/L <br />0.1 mg/L <br />0.1 mg/L <br />PHYSICAL PROPERTIES LDL <br />pH 0.1 s.u. <br />Total Dissolved Solids 10 mg/L <br />Total Suspended Solids <br />METALS TOTAL AND DISSOLVED LDL <br />Aluminum 0.20 mg/L <br />Antimony 0.001 mg/L <br />Arsenic 0.10 mg/L <br />Copper 0.005 mg/L <br />Lead 0.005 mg/L <br />Manganese 0.01 mg/L <br />Mercury 0.0001 mg/L <br />Silver 0.001 mg/L <br />Iron 0.03 mg/L <br />Thallium 0.001 mg/L <br />Zinc 0.005 mg/L <br />METALS DISS. ONLY LDL <br />Molybdenum 0.005 mg/L <br />Uranium 0.0002 mg/L <br />METALS TOTAL ONLY LDL <br />Phosphorus 0.10 mg/L <br />Fluoride 0.10 mg/L <br />RADIONUCLIDES DISSOLVED LDL <br />Radium 226 0.2 pCi/L <br />0