geomorphic reclamation of the rosebud pit,...
TRANSCRIPT
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GEOMORPHIC RECLAMATION OF THE ROSEBUD PIT, WYOMING
Tyrel Hulet, P.E. – Trihydro Corporation Mark Donner, P.E. – Trihydro Corporation
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Special Thanks Wyoming AML
Division Arch of Wyoming Herrera
Environmental Consultants – Len Ballek
Landowner – Don Calvert
Mk Weeden Construction – Mark Rosenbaum and Monte Weeden
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Presentation Overview
Project Location Rosebud Pit Site
Conditions Project Goals Coordination Design Approach Project Discussion Conclusions
Rosebud Pit, WY – Your new winter destination
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Project Location
Hanna Basin
Within active mining permit boundary
South-central Wyoming
2 miles west of Hanna, Wyoming
Elevation – Approx. 6,800ft.
Google Maps
Project Location
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Rosebud Pit Background
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Rosebud Site Conditions - Upper
Highwall Overburden Pile
Pond
Coal Slack
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Rosebud Site Conditions - Lower
Arch of Wyoming Reclamation
Overburden Pile
Highwall
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Project Goals Mitigate physical
hazards Backfill pond Decrease highwall
and spoil pile slopes Encapsulate coal slack
and unsuitable material
Improve wildlife habitat
Improve area for stock grazing
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Coordination
Wyoming Land Quality Division
Memorandum of Understanding
Wyoming Game and Fish Department
Private landowner
Wyoming AML funded and managed reclamation Site falls within active mining permit boundary administered by
Arch of Wyoming
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Design Approach Natural Regrade Design using
Carlson Civil GeoFluv Software Open basin design Nearby reference areas Reduce erosion Considerable success on Wyoming
AML projects
Pond De-watering and Backfill Discharge De-watering alternatives
Re-vegetation Soil Amendments Vegetation/soil survey
Continued Use Landowner Arch of Wyoming
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Design Approach – NR Input
Grading boundary Channel locations A-channels Drainage density Straightline
Slopes Main channel
slope at mouth Precipitation data
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Project Discussion
De-water the pond Removal of coal slack Earthmoving Re-vegetation
Bidding 6 qualified bidders $2.5 Mil Avg.
Contractor Mk Weeden Construction Contract Water Service
Construction November 2012 – May 2013
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Project Discussion – De-watering
Land application Impoundments Backfill pond
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Project Discussion – Earthmoving Earthmoving work
began concurrently with de-watering
Surveying Dozer ripping of
highwall Slot dozing with D10
and D11 bulldozers Most of material
moved by 637 Scrapers Blasting (change order)
Over-cutting makes the superintendent angry!
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Project Discussion – Earthmoving
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Project Discussion – Earthmoving
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Project Discussion – Earthmoving
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Project Discussion – Blasting
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Project Discussion – Finish Grading
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Project Discussion – Re-vegetation Pre-ripping/disking Manure application Fertilizing Pit seeding
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Conclusion – Final Product
Before After
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Conclusion – Final Product
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Conclusion – Final Product
Regraded surface blends with surroundings
Revegetation success – Finally!
After
Before
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Conclusion – Lessons Learned
Under-estimated competency of native sandstone More test pitting Fill shrink factor Additional Information for Contractor Weather difficulties MOU boundaries
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Questions? Comments?