Am #1 Maggie Gulch Feature Work List.pdf
PDF 151 KB Posted
- Attached to
- PKAA, Maggie Gulch Project
- Solicitation number
- DQ1 PKAA 2026000376 2
- Issued by
- Rio Blanco County, Colorado
About this file
This is an Amendment 1 Feature Work List for the Maggie Gulch Project in Colorado, involving mine opening closures across multiple sites. The document outlines eleven distinct mine features requiring closure work, including adits, shafts, and stopes at various locations within the Maggie Gulch area. Closure methods vary by feature type and include corrugated steel pipe with bat grates, polyurethane foam backfill, steel grated shaft closures, and bat grates with access doors. Each feature is assigned a unique identifier with specific excavation dimensions, erosion measurements, present measurements, depth specifications, and lining characteristics. Work locations are identified by UTM coordinates using NAD83 datum, with access methods ranging from walking trails (distances of 0.2 to 0.75 miles with elevation gains of 200 to 550 vertical feet) to helicopter access for more remote sites. The document references Standard Drawings and Bid Specifications (SWS documents), with materials requirements including corrugated steel pipe, polyurethane foam, steel beams, and onsite fill materials.
The work description section provides detailed operational guidance for each feature, including material quantities, curing times, artifact protection measures, equipment access conditions, and coordination requirements with landowners and project managers. Notable specifications include the use of 5 cubic yards of polyurethane foam for Features 02 and 11, 24 cubic yards of polyurethane foam for Feature 03 with a four-day curing period, and one W4x13 beam for Feature 09. Several sites require helicopter access due to remote location and challenging terrain, while others permit limited off-road equipment access with prior authorization. Historic artifact preservation is emphasized, particularly at Feature 03 where artifacts must be protected during the polyurethane foam pouring process. The document does not specify pricing terms, contract duration, award dates, or funding sources.
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Text version
Maggie Gulch – Feature Work List - Amendment 1
Feature ID Type Description of Mine Opening
Closure Method
General Bid Specifications and
Drawings
UTM
(X,Y)
NAD83
Work Description / Notes
(BLM) Adit
Excavated:4ft by 7ft Eroded:2ft by 4ft Present:4ft by 7ft
Depth:100+ ft Lining:Rock Drainage:No
Corrugated Steel Pipe with Bat Grate
SWS 10 & SWS 9.
Standard Drawing
No. 5 & 6 (Sheet 2).
276909.88 4189224.90
15ft long, 2ft diameter CSP with bat grate. Utilize 5 cubic yards of polyurethane foam to set the pipe and backfill the final 3 feet of the pipe with onsite fill materials.
Walking access only from CR23, 150 vertical feet, 360 horizontal feet. Helicopter access suggested.
03 Shaft
Excavated:7ft by 7ft Eroded:15ft by 15ft Present:15ft by 15ft
Depth:30 ft Lining:Concrete
Drainage:No
Polyurethane Foam
SWS 9 for Polyurethane Foam
(PUF).
276734.02 4188120.03
Place a bottom form at 18 feet and pour 13 vertical feet with 24 cubic yards of PUF. Leave all historic artifacts in place while pouring. The debris that is collapsed into the shaft can be used to help make the bottom form.
The artifacts in and around the shaft will be protected to prevent them from being covered in PUF. Common fill for the top will be installed 4 days after the PUF has cured. Common fill will be scavenged from the parking area to avoid disturbing the historic artifacts around the shaft. Park at the site at the end of CR23, equipment access available, but no disturbance of artifacts is allowed.
(BLM) Adit
Excavated:6ft by 7ft Eroded:6ft by 7ft Present:6ft by 7ft
Depth:80 ft Lining:Rock
Drainage:Yes
Bat Grate SWS 13 Standard
Drawing No. 6 (Sheet 1 & 2)
276065.01 4187971.02
Bat Grate. Walking access only from the end of CR23 road. 3/4 of a mile hike and 550 vertical feet. Helicopter access suggested.
05 Adit
Excavated:6ft by 7ft Eroded:6ft by 7ft Present:6ft by 7ft
Depth:100+ ft Lining:Rock Drainage:No
Bat Grate with Access Door
SWS 13 Standard Drawing No. 6 (Sheet
1 & 2)
274783.08 4195332.00
Bat Grate with 2ft x 2ft Access Door. Walking access only from Eureka Campground. 1/3 of a mile hike and
500 vertical feet with a steep talus scramble. Helicopter access suggested.
Opening
Closure Method
General Bid Specifications and
Drawings
UTM
(X,Y)
NAD83
Work Description / Notes
(BLM) Adit
Excavated:10ft by 12ft
Eroded:10ft by 12ft Present:10ft by 12ft
Depth:20+ ft Lining:Rock
Drainage:Yes
Bat Grate SWS 13 Standard
Drawing No. 6 (Sheet 1 & 2)
265382.07 4189752.03
Bat Grate. Walking access only from Bakers Park trailhead parking lot, 1/5 of a relatively flat mile hike.
The bat grate will be placed outside the wooden door. Do not disturb the historic wooden door.
08 Shaft
Excavated:15ft by 20ft
Eroded:15ft by 20ft Present:15ft by 20ft
Depth:30 ft Lining:Rock +
Timber Drainage:No
Backfill SWS 2 264923.92 4185247.07
Backfill. No rock fill required, utilize on-site fill materials immediately around the hole. Backfill with equipment.
Off-road equipment access possible with minor improvements on 1/5 of a mile of road and 200 feet vertical down to the site. Coordinate road access with the Landowner and the Project Manager prior to mobilizing to the site.
09 Shaft
Excavated:8ft by 8ft Eroded:8ft by 8ft Present:8ft by 8ft
Depth:25+ ft Lining:Rock
Drainage:Yes
Steel Grated Shaft
SWS 8, Standard Drawing No. 4
272608.09 4202778.07
Steel grated shaft closure with a spread footing on the downhill side of the closure where there is no competent bedrock. The span of this hole will require (1) W4x13 beam. No equipment access, walk 1/4 mile from CR18 up to the site, 350 vertical feet. Helicopter access suggested.
10 Stope
Excavated:6ft by 30ft Eroded:6ft by 30ft Present:6ft by 30ft
Depth:100+ ft Lining:Rock Drainage:No
Bat Grate with Access Door
SWS 13 Standard Drawing No. 6 (Sheet
1 & 2)
264838.37 4185201.08
Bat Grate with 2ft by 2ft Access Door. The safety closure will be installed at an angle to match the opening which has vertical and horizontal components.
Park at the Power Pole access road and walk 200ft to the site and walk 50 vertical feet down to the site.
Opening
Closure Method
General Bid Specifications and
Drawings
UTM
(X,Y)
NAD83
Work Description / Notes
11 Adit
Excavated:6ft by 7ft Eroded:2ft by 6ft Present:2ft by 6ft
Depth:100+ ft Lining:Rock Drainage:No
Corrugated Steel Pipe with Bat Grate and Access
Door
SWS 10 & SWS 9
Standard Drawing
No. 5 & 6 (Sheet 2).
264849.55 4185189.65
15 foot long, 2 foot diameter CSP with Bat Grate. Utilize 5 cubic yards of polyurethane foam to set the pipe and backfill the final 3 feet of the pipe with onsite fill materials. Park at the Power Pole access road and walk
200ft to the site and walk 50 vertical feet down to the site.
File details come from the government source that posted it. Updated .