3. Feature Work List DQ1 PKAA 2026-0376.pdf
PDF 559 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 a Feature Work List for the PKAA Maggie Gulch Project in Colorado, detailing mine closure and remediation work across eleven identified features. The project involves sealing and stabilizing abandoned mining features using various closure methods including bat grates, corrugated steel pipe installations, polyurethane foam fills, and backfill operations. The work encompasses two adit features with standard bat grate closures (Features 04 and 06), three adit features requiring specialized closures with access doors or corrugated steel pipe systems (Features 02, 05, and 11), three shaft features to be filled with polyurethane foam or backfill materials (Features 03, 08, and 09), and one stope feature with an angled bat grate installation (Feature 10). Each feature is located at specific UTM coordinates on NAD83 datum and requires varying levels of site access, ranging from straightforward walking access to helicopter-assisted operations due to remote locations and challenging terrain.
Closure methods vary by feature type and condition, with specifications referencing Standard Drawings and specific work specifications (SWS documents). Work descriptions address site-specific considerations including artifact protection requirements, equipment access constraints, material sourcing from onsite locations, and specialized installation techniques such as polyurethane foam curing timelines. Access routes range from minimal disturbance parking areas to multi-mile hikes with significant vertical elevation changes of up to 550 vertical feet. Several features designated as BLM properties are included, and project implementation requires coordination with landowners and project management prior to mobilization. Quantities include specifications for corrugated steel pipe installations, polyurethane foam volumes ranging from 13 to 40 cubic yards per feature, and bat grate configurations adapted to individual opening dimensions.
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Text version
Maggie Gulch – Feature Work List 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 installed4 days afterthe PUFhas 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 mile hike that is relatively flat.
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
Polyurethane Foam SWS 9 272608.09
4202778.07
Polyurethane Foam, set bottom form at 22 feet. Pour 40 CY of PUF. 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 .