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<br />Hydrologic Monitoring Plan <br />Northfield Mine <br />TABLE 1 <br />Surface Water <br />Suggested Water Quality Parameters <br />• <br />• <br />pH (field) <br />Phosphate (PO4 as P) <br />Conductivity at 25oC (field) <br />Sodium (Na+) <br />Temperature (field) <br />Sulfate (SO4) <br />Dissolved Oxygen (field) ** A <br />Aluminum (AI) <br />Total Suspended Solids ** <br />Arsenic (As) <br />Total Dissolved Solids <br />Cadmium (Cd) <br />Oil and Grease ** <br />Copper (Cu) <br />Sodium Adsorption Ratio Iron (Fe) <br />Bicarbonate (HCO3) <br />Lead (Pb) <br />Calcium (Ca+2) <br />Manganese (Mn) <br />Chloride (CI-) <br />Mercury (Hg) <br />Magnesium (Mg+2) <br />Molybdenum (Mo) <br />Nitrate-Nitrite <br />Selenium (Se) <br />Zinc (Zn) <br />Hardness <br />* Total species concentration (dissolved and suspended). <br />** Not necessary for springs and seeps. <br />9 <br />Revised 11/5/2007 <br />