Art Grguric, Backleggs Creek Watershed Association, Operations and Maintenance Panel
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This document discusses operation and maintenance issues at the Big Run acid mine drainage treatment complex in Indiana County, Pennsylvania. It describes problems at several treatment systems, including systems being too small to adequately treat flows, requiring frequent stone cleaning and flushing, and issues with clogging and untreated water bypassing treatment. It also notes the need to control discharge flows and manage sludge from the lime dosing system given limited space for sludge ponds. Regular maintenance is needed but can require significant time, especially during high flow periods. The downstream waters have seen improvements in acidity levels since treatment began.
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Art Grguric, Backleggs Creek Watershed Association, Operations and Maintenance Panel
- 1. Blackleggs Creek Big Run AMD Treatment Complex Indiana County, PA
- 3. Big Run AMD Treatment Complex
- 4. Big Run #2
- 5. Big Run #2 Intake Valve
- 6. Big Run #2 Limstone Bed Piping
- 7. Big Run #2 Settling Wetland
- 8. Big Run #2 Iron Coating of Limestone
- 9. Big Run #2 Limestone Washing and Replacing
- 10. 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
- 11. Big Run #7
- 12. Big Run #7 Mine Water Capture
- 13. Big Run #7 Pipe Labyrinth
- 14. Big Run #7 Drop Boxes
- 15. Big Run #7 OM&R • Cleaning Debris around mine opening • Cleaning Stone • Flushing • Cleaning and replacing stone • Clogging pipes
- 16. Big Run #7A Mine Blowout #7A #8
- 17. Big Run #7A Mine Blowout
- 18. Big Run #7A Incidental Coal Extraction
- 19. Big Run #7, #7A, and #8 Combined
- 20. Discharges of Big Run #7A and #8 #7A #8
- 21. Big Run #8 Construction Logistics
- 22. Big Run #8 Drilling to Locate Mine Portal
- 23. Big Run #8 Partial Construction to Protect Against Possible Mine Blowout
- 24. Big Run #8 Construction Challenges
- 25. Big Run #8 COG and Robot Exploration
- 26. Big Run #8 Mine Water Capture
- 27. Big Run #8 Mine Water Inflow Management
- 28. Big Run #8 Completed System
- 29. Big Run #7, #7A, and #8 Combined
- 30. 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.
- 31. Big Run #3 Silo Pad
- 32. Big Run #3 Lyme Dosing Silo
- 33. Downstream of the Big Run AMD Treatment Complex -50 0 50 100 150 200 250 Combined Total and Hot Acidity (mg/L)
- 34. 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.
- 35. 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
- 36. Blackleggs Creek Watershed Association and Cooperative Trout Nursery • Find us on Facebook at Blackleggs Creek Thanks, Art GrGuric Watershed and Nursery Manager
Notes de l'éditeur
- 52 discharges in 100 miles of stream
- 25 acres of property donated by what was then R&P Coal Company 12-15 acrea of that is now used by 4 AMD treatment systems Has potential to clean up 7 miles of stream and return at least 4 miles to productive trout-stocked fishery
- Discharge and treatment system specifics: Constructed in 2001, BR#2 is a Limestone upflow system designed to treat a 1200 gal/minute Aluminum discharge. The system has lived its life expectancy due to regular, routine maintenance. It has benefited from a Quick Response Grant administered by the Western Pennsylvania Coalition for Abandoned Mine Reclamation, the addition of new limestone, and exceptional monitoring by the Kiski-Conemaugh Stream Team and the Pennsylvania Senior Environmental Corps. System reduces Iron and Aluminum by nearly half.
- Average Flow of 1900 GMP, Discharge has average pH of 3.34. Hot acidity of 158
- Mine opening used for educational purposes. Requires maintenance of pipes, picking up debris.
- $60K of pipe in an elaborate system, again you see the small holes.
- Maintenance includes cleaning of stone, flushing of ponds with adjusting the boxes
- Cannot sample raw discharge because it is piped directly to #3
- #7A is combined with #8 and sent across road to #3 treatment facility
- Only spot for ponds was under coal.
- No specific Maintenance for #7A because it is combined with other discharges and piped across road to the Big Run #3 treatment system
- Flow of 860 GPM, Discharge pH of 3.13. Loaded with Iron and Aluminum. Hot Acidity of 259
- Very steep terrain
- System reduces Aluminum in stream by approximately 44 ton/yr
- Also removes another 13.5 ton/yr Aluminum from Big Run. Is life possibly downstream soon?
- Looking at Act 13 for a fund for OM&R