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Pond 7 is <br /> downstream of Pond <br /> 001 and controls <br /> runoff from the _ <br /> majority of the _ <br /> disturbed area that <br /> includes Pond 001. <br /> Pond 7 (right) was <br /> about 3% full and <br /> frozen. The outlet <br /> gate was found <br /> closed. A flow <br /> estimated at 2-5 <br /> gallons per minute <br /> was noted flowing <br /> into Pond 7. The EC <br /> of this inflow was <br /> measured at 1500 <br /> umhos/cm. <br /> Conductivity values <br /> would suggest that Pond 001 has caused ground water to mound in the vicinity of the pond <br /> resulting in seepage and EC values of flows entering Pond 7 are a mixture of mine water and <br /> alluvial ground water. Lining of Pond 001 may be necessary to prevent contamination of <br /> alluvial waters and subsequent ground water discharge to the Purgatoire River. <br /> 4 <br />