3. Feature Work List DQ1 2026-0375.pdf
PDF 558 KB Posted
- Attached to
- PKAA, BPMD Plus Project
- Solicitation number
- DQ1 PKAA 2026000375 2
- Issued by
- Rio Blanco County, Colorado
About this file
Summary of Feature Work List for PKAA BPMD Plus Project, Colorado
This Feature Work List document outlines mine opening closure work for the PKAA BPMD Plus Project in Colorado, detailing six separate adit (mine entrance) features requiring safety closures and rehabilitation. The work encompasses installing bat grates, bulkheads, adit doors, and corrugated steel pipe closures across multiple mine sites, with work descriptions varying from new installations (Feature 268-23) to maintenance repairs (Features 268-15 and 268-26). Each feature includes specific excavation dimensions, depth measurements, lining materials, drainage requirements, closure methods, standard specifications referencing SWS drawings, UTM coordinates, and detailed work notes. The projects range in scope from simple bulkhead repairs requiring 2-foot additions to complex installations involving double swinging doors with steel I-beams, rebar, and timber replacement. Access conditions vary significantly across sites, with some features accessible by vehicle via county roads and others requiring walk-in access of up to one mile with elevation gains exceeding 1,100 vertical feet; helicopter access is recommended for the most remote locations.
The Feature Work List specifies technical requirements including water management provisions, material sourcing constraints, environmental considerations such as air quality monitoring, and site restoration obligations. Notable requirements include utilizing on-site water sources for cement mixing where available, hauling water to sites without adequate supply, assembling modular components for field delivery, and restoring roads to pre-construction conditions upon completion. Several features present challenging working conditions, such as Feature 3's requirement for an air meter due to historical "bad air" concerns and Feature 5's rough stream crossing requiring road improvement. Bidders must reference standard specifications and drawings (SWS 10, 12, 14) and comply with specific installation details such as keying steel beams into timber sets, welding rebar at precise intervals, and installing access doors with functioning locking mechanisms to allow water passage while maintaining structural integrity.
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Text version
BPMD Plus – Feature Work List
Feature ID Type Description of Mine
Opening Closure Method
General Bid Specifications and
Drawings
UTM
(X,Y) NAD83 Work Description / Notes
2 Adit
Excavated:5ft by 6ft Eroded:3ft by 4ft Present:3ft by 4ft
Depth:100+ ft Lining:Rock
Drainage:Yes
Bulkhead with Bat Grate
SWS 14 Standard Drawing No.10 & 6
Sheet 2
265811.29, 4197246.37
Bulkhead with a 3ft diameter 3ft x 3ft Bat Grate. Utilize the water in the winze for cement mixing. No equipment access, walk 0.8 miles to the site and 900 vertical feet. Helicopter access suggested.
268-23 (NEW) Adit
Excavated:6ft by 7ft Eroded:6ft by 7ft Present:6ft by 7ft
Depth:100s ft Lining:Timber Drainage:Yes
Adit Doors with Bat Grate
SWS 12 Standard Drawing No. 6
Sheet 2
268211.80, 4196024.26
Adit Doors (3ft X 5ft) with Bat Grate. Attach the safety closure to the existing steel sets. Install the safety closure above the EPA drain pipe. Equipment access available. Move the concrete block barrier (5ft x 5ft x 4ft) out of the roadway for driving access and place it back when finished. No excavation allowed, all work will take place above the pipe and will not disturb the water.
3 Adit
Excavated:5ft by 7ft Eroded:3ft by 5ft Present:3ft by 5ft
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
263528.59, 4194451.35
3ft diameter, 15ft long CSP with Bat Grate and an Access Door. CSP can be assembled in sections for delivery and installation. Pour 5 CY of Polyurethane Foam (PUF) around the CSP. Place rocks in the final PUF lift at the surface when the PUF is tacky and will hold rocks in place. Backfill the final 3 feet of the CSP with on-site fill material. Old Sign at the portal says
“bad air” so an air meter will be required while working underground. No equipment access. 1 mile walk with 1,100 vertical feet elevation gain on a trail that starts at the Anglo Saxon Mine. Helicopter Access suggested.
Description of Mine
Opening Closure Method
General Bid Specifications and
Drawings
UTM
(X,Y) NAD83 Work Description / Notes
4 Adit
Excavated:10ft by 10ft
Eroded:4ft by 6ft Present:4ft by 6ft
Depth:25 ft Lining:Timber Drainage:Yes
Adit Door with Bat Grate
SWS 12 Standard Drawing No. 6
Sheet 2
271344.64, 4198875.41
Adit Door (3ft x 5ft) with Bat Grate installed into the timbered adit. An angle iron frame will be bolted to the timber sets every 12 inches. A 4 foot long 4 inch steel beam shall be keyed into the timber sets 6 inches above the floor of the mine to allow water to pass unobstructed below the safety closure. Rebar will be welded to the beam 12 inches on center and run vertically into the mine floor to a minimum depth of 8 inches. Equipment access available off of County
Road 9 (Placer/Picayune Road).
5 Adit
Excavated:10ft by 10ft
Eroded:10ft by 10ft Present:10ft by 10ft
Depth:1000+ ft Lining:Timber Drainage:Yes
Adit Doors with Bat Grate
SWS 12 Standard Drawing No. 6
Sheet 2
275340.56, 4198200.60
Adit Doors with double swinging doors with bat grates.
Install the closure onto the existing steel sets. A 10 foot long 4 inch steel I-beam shall be welded to the existing steel sets, 6 inches above the wood flooring planking inside the mine, to allow water to pass unobstructed below the safety closure. Rebar will be welded to the beam 12 inches on center and run vertically into the mine floor to a minimum depth of 8 inches. The left adit door must have a top and bottom pin that extends into the top steel set and the bottom hanging I-beam to hold it into place. The right adit door will have the locking mechanism. Install 80 board feet of 2"X6"X8' long timbers in adit section where the timber lagging is missing. Equipment access available off of the Silver Wing Mine road. The road is overgrown in spots and the Burns Gulch stream crossing is rough. The road must be returned to its preconstruction condition upon completion.
Description of Mine
Opening Closure Method
General Bid Specifications and
Drawings
UTM
(X,Y) NAD83 Work Description / Notes
268-15 (maintenance) Adit
Excavated:6ft by 6ft Eroded:6ft by 6ft Present:6ft by 6ft
Depth:100 feet + ft Lining:Rock
Drainage:Yes
Bulkhead SWS 14 Standard Drawing No. 10
268107.42, 4199030.67
Repair the damaged bulkhead, approximately 3ft by 3ft section. No water on-site, except in the spring.
Haul water to the site. Add another 2ft of bulkhead in front of the previous bulkhead, full length and width of opening. No equipment access, walk in only. Park at the Mogul mine and walk 300 horizontal feet to the site and 50 vertical feet.
268-26 (maintenance) Adit
Excavated:6ft by 8ft Eroded:4ft by 3ft Present:4ft by 3ft Depth:30 feet + ft
Lining:Timber Drainage:No
Bulkhead SWS 14 Standard Drawing No. 10
265579.76, 4197140.89
Repair the damaged bulkhead, approximately 2ft by 2ft section. No water on-site, get water from Dry Gulch. Haul water to the site. Add another 2ft of bulkhead in front of the previous bulkhead, full length and width of opening. No equipment access, walk in only. Park at Dry Gulch and walk 0.3 miles and 500 vertical feet.
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