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AMD
seeps from the spoil ridge that borders the east side of the large gravel
parking lot. This parking lot used to be an end-cut lake/incline from the
surface mine. |
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Acid water seep |
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The
drainage way was widened to six feet and about six feet
in depth to groundwater. The
pH was 3.0 and 373 ppm acidity. Acid water drains to the reservations one
good lake, Crawford, and acid groundwater flows to Nordhron and Red Lakes. |
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Trench expanded |
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Over 500 tons of
rock rip-rap was added to the excavated drainage way along with 75 tons of
Code H and L, commercial alkaline material, and calcium hydroxide. |
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Dumping rock rip-rap |
More rock rip-rap |
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Truck almost finished |
Final dumping |
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The finished alkaline
trench/drainage way that blends in with the surrounding topography. |
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Finished
alkaline trench |
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Accessibility