Alamosa River Treatment

1992-1994: EPA and Colorado Department of Public Health and Environment emergency response at abandoned Summitville Mine.

1994: Interim Record of Decision:

1: Water treatment plant.

2: Cropsy Waste Pile, Beaver Mud Dump, Summitville Dam Impoundment and mine pits.

3. Heap Leach Pad.

4. Reclamation.

1994-1995: Heap Leach Pad detoxification.

1994: Reynolds Adit bulkhead.

1996: Cropsy Waste Pile, Beaver Mud Dump, Summitville Dam Impoundment and mine pit closure.

1996-2000: Modification to the existing water treatment plant.

1994-1998: Cropsy Valley restoration and revegetation.

2005: We assume lead role for wastewater treatment plant and site operation and maintenance.

2006: Rule change before the Water Quality Control Commission for the Alamosa River.

2008-2009: Wightman Fork and Summitville Dam Impoundment improvement, installation of micro-hydro-power.

2010: Begin construction of new water treatment plant.

2011: Completed construction of new water treatment plant

2013: Completed reconstruction of the Wightman Fork rundown structure; Summitville Mine site achieved the site-wide construction completion milestone"(Summitville Mine).

("Summitville Mine").

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