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• The heavy metals with a "t" subscript by their symbol represent total measurements, while <br />the others are dissolved concentrations. Dissolved and total concentrations are similar for most of <br />the heavy metals, except for iron concentrations in some wells where the total values are <br />significantly greater in some wells. <br />Iron concentrations have varied over large ranges near the mine pits and at distant wells <br />but no consistent trends have been observed. Levels of aluminum, barium, boron, phosphate and <br />manganese have also varied over significant ranges but no consistent trends have been observed. <br />Arsenic, cadmium, chromium, copper and lead concentrations have been low with a few exceptions. <br />Copper concentrations in wells GBS and GE3 have been higher mainly prior to mining. A few <br />values of total copper and total lead have also been elevated in a few wells without being <br />• consistently observed A few early lead concentrations in wells GE2 and GE3 were also observed. <br />Molybdenum, nickel, selenium and vanadium concentrations have stayed low. Only one value of <br />radium 226 in well GA2 exceeded the proposed drinking water standard by the EPA of 20 pCi/1. <br />Three values from well GD3 also slightly exceeded this value. The radium data does not show any <br />consistent trends but the values are *ypical of natural variations and analytical variations. <br />.. <br />7-66 <br />3-13 (Revised 09/21/95) <br />