GCI Pollyanna #2 Acid Mine Drainage Remediation Project
The contractor shall construct a multi-stage passive water treatment system for AMD remediation. The work includes: mobilization; clearing and grubbing; dewatering of two pre-existing ponds; earth fill and dirt work to create a 415-foot limestone aggregate channel, a 150 ft × 90 ft flushable limestone bed (FLB), a 190 ft × 75 ft settling/oxidation pond, a 204-ft transfer channel, and a hybrid anaerobic/aerobic wetland; installation of an 8-inch HDPE collection pipe, four concrete flow spreaders, a 10-inch dosing siphon with concrete vault, and settling pond appurtenances (outlet pipes, orifice plates, baffle curtains); placement of high calcium limestone (AASHTO #3); wetland seeding and planting; permanent erosion control; installation of 5-wire fencing; and removal of equipment and associated tanks.
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