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Approaches to operations and maintenance of AMD treatment systems. Learn how they deal with tough O&M issues.
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Blackleggs CreekBig Run AMD
Treatment Complex
Indiana County, PA
Big Run AMD Treatment Complex
Big Run #2
Big Run #2 Intake Valve
Big Run #2 Limstone Bed Piping
Big Run #2 Settling Wetland
Big Run #2 Iron Coating of Limestone
Big Run #2 Limestone Washing and Replacing
Big Run #2 OM&R
• System is too small for flow requires constant adjustment of boards in drop boxes
• Requires regular flushing• Predicted dissolution and coating of stone• Plugging of holes in pipes – now using chain-sawed
slats rather than drilled holes• Uncooperative Landowner – during high flow, 10-20%
flow goes untreated• Fear that during high flow a siphon is created• Erosion in Overflow channel
Big Run #7
Big Run #7 Mine Water Capture
Big Run #7 Pipe Labyrinth
Big Run #7 Drop Boxes
Big Run #7 OM&R
• Cleaning Debris around mine opening• Cleaning Stone• Flushing• Cleaning and replacing stone• Clogging pipes
Big Run #7A Mine Blowout
#7A #8
Big Run #7A Mine Blowout
Big Run #7A Incidental Coal Extraction
Big Run #7, #7A, and #8 Combined
Discharges of Big Run #7A and #8
#7A #8
Big Run #8 Construction Logistics
Big Run #8 Drilling to Locate Mine Portal
Big Run #8 Partial Construction to Protect Against Possible Mine Blowout
Big Run #8 Construction Challenges
Big Run #8 COG and Robot Exploration
Big Run #8 Mine Water Capture
Big Run #8 Mine Water Inflow Management
Big Run #8 Completed System
Big Run #7, #7A, and #8 Combined
Big Run #8 OM&R
• Ponds too small to treat the flow and iron levels due to space constraints. We have full iron clogging every 4 months. Now we are facing decision of Lime in silo vs. cleaning stone
• Broken valve down over the bank allowing untreated water to escape to stream.
Big Run #3 Silo Pad
Big Run #3 Lyme Dosing Silo
Downstream of the Big Run AMD Treatment Complex
7/28/99 4/11/00 4/21/02 8/3/03 2/18/04 1/22/05 7/9/05 1/21/06 7/22/06 1/17/07 7/21/07 2/4/08 7/27/08 5/3/09 6/26/10 4/6/11 7/18/12-50
0
50
100
150
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250
Combined Total and Hot Acidity (mg/L)
Big Run #3 OM&R
• At this time, we do not know how much lime is needed/yr or how much it will cost/yr
• The more lime you use, the more sludge is generated for disposal
• No sludge pond, the designed sludge pond is only big enough for #7 but two additional discharges will be sent through silo, #7A and #8
• #3 is a combo of all discharges so it is important to control flow of all other system discharges.
Big Run AMD Treatment Complex OM&R
• During normal flow, 1hr/wk• During high flow it is easy to spend >20hrs/wk• Not enough sunshine to depend on solar• The more you flush the longer the system is
efficient• Constantly monitoring pH at outflow and
mouth of Big Run
Blackleggs Creek Watershed Association and Cooperative Trout Nursery
• Find us on Facebook at Blackleggs Creek
Thanks,Art GrGuricWatershed and Nursery Manager