5-Appendix 1-Item 4.0 Feature Worktable.pdf
PDF 213 KB Posted
- Attached to
- PKAA, Dream Canyon Project
- Solicitation number
- DQ1 PKAA 2026000355 2
- Issued by
- Boulder County, Colorado
About this file
This is an Appendix detailing the Feature Work Table for Item 4.0 Install Mine Closures associated with the Dream Canyon project. The document outlines the specifications and work requirements for closure of 20 identified mine openings, including shafts, stopes, and adits, located at various UTM coordinates within the project area. The work encompasses multiple closure methods tailored to site-specific conditions: machine backfill with onsite material for 12 features, rock bulkhead closures with bat accommodations for 5 features, grated shaft closures with bat cupolas for 2 features, corrugated steel pipe installations for 1 feature, and a grated adit closure for 1 feature. Each feature closure requires implementation of stormwater sediment control measures, including the installation of 25 linear feet of biodegradable waddles on the downstream side of working areas under project manager direction. Several features require bat exclusion procedures prior to closure, while others incorporate bat access alternatives such as bat ladders, bat gates, or bat cupolas to maintain habitat compatibility.
The document specifies detailed technical requirements for each mine opening, including excavated dimensions, eroded dimensions, present dimensions, and depth measurements. Closure specifications reference multiple sections of technical drawings and standard specifications, with requirements ranging from basic machine backfill operations to more complex installations involving steel beams, corrugated steel pipe, polyurethane foam, grouted rock bulkheads, and drainage provisions. Work descriptions identify specific materials, dimensions, and construction methodologies for each feature, such as W4 x 13 and W6 x 20 steel beams for grated shaft closures, 36-inch 12-gauge corrugated steel pipe for adit closures, and grouted native rock bulkheads with specified thickness requirements. No pricing, bidding timelines, award information, or contract terms are contained within this appendix.
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Appendix 1 – Item 4.0 Feature Work Table
Table - Dream Canyon – Item 4.0 Install Mine Closures
Feature ID Type Description of Mine
Opening Closure Method
General Bid Specifications and Drawings
UTM
(X,Y)
NAD83 Work Description / Notes
363-GF002 Shaft
Excavated:5ft by 6ft Eroded:8ft by 8ft Present:8ft by 8ft
Depth:15 ft Lining:Rock Drainage:No
Machine Backfill Section 2 465599
4428500
BAT EXCLUSION PRIOR TO CLOSING PER SPEC
PROVIDED UNDER ITEM 4.0.
Remove timber debris. Excavate to determine extents.
Bar off rocks from shaft collar and machine backfill with onsite material. Rockfill is not required.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five
(25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.
363- GF002a Shaft
Excavated:5ft by 9ft Eroded:12ft by 9ft Present:5ft by 9ft Depth:23 feet ft
Lining:Rock Drainage:No
Machine Backfill Section 2 465580.
4428496
BAT EXCLUSION PRIOR TO CLOSING PER SPEC
PROVIDED UNDER ITEM 4.0.
Remove timber debris. Excavate to determine extents.
Bar off rocks from shaft collar and machine backfill with onsite material. Rockfill is not required.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five
(25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.
363-GF003 Stope
Excavated:
Eroded:17ft by 34ft Present:17ft by 34ft
Depth:17 feet ft Lining:Rock Drainage:No
Machine Backfill Section 2 465564
4428474
BAT EXCLUSION PRIOR TO CLOSING PER SPEC
PROVIDED UNDER ITEM 4.0.
Excavate to determine extents. Machine backfill with onsite material. Rockfill is not required.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five
(25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.
Description of Mine
Opening Closure Method
General Bid Specifications and Drawings
UTM
(X,Y)
NAD83 Work Description / Notes
363-GF004 Stope
Excavated:5ft by 7ft Eroded:3ft by 7ft Present:3ft by 7ft Depth:18 feet ft
Lining:Rock Drainage:No
Machine Backfill Section 2 465562
4428520
BAT EXCLUSION PRIOR TO CLOSING PER SPEC
PROVIDED UNDER ITEM 4.0.
Excavate to determine extents. Machine backfill with onsite material. Rockfill is not required.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five
(25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.
363-GF005 Adit
Excavated:3ft by 7ft Eroded:3ft by 7ft Present:3ft by 7ft Depth:18 feet ft
Lining:Rock Drainage:No
Rock Bulkhead w/ Bat Ladder
Section 14 Section 13
Std. Drawing #s
6.2 & 10
465493 4428523
Construct a Rock Bulkhead closure with Bat Grate Alternative. Utilize a minimum three (3) foot length of thirty-six (36) inch, twelve (12) gauge CSP with an attached bat ladder.
Neither an access door nor drainpipe are required.
363-GF006 Adit
Excavated:3ft by 7ft Eroded:3ft by 7ft Present:3ft by 7ft Depth:15 feet ft
Lining:Rock Drainage:No
Rock Bulkhead w/ Bat Ladder
Section 14 Section 13
Std. Drawing #s
6.2 & 10
465476 4428525
Construct a Rock Bulkhead closure with Bat Grate Alternative. Utilize a minimum three (3) foot length of thirty-six (36) inch, twelve (12) gauge CSP with an attached bat ladder.
Neither an access door nor drainpipe are required.
363-GF007 Stope
Excavated:17ft by 35ft
Eroded:17ft by 35ft Present:17ft by 35ft
Depth:15 feet ft Lining:Rock Drainage:No
Machine Backfill Section 2 465510
4428559
Collapse south side of trench to reduce highwall and use onsite material to backfill. No rockfill required.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five
(25) linear feet of biodegradable waddles shall be
Description of Mine
Opening Closure Method
General Bid Specifications and Drawings
UTM
(X,Y)
NAD83 Work Description / Notes
363- GF007a Stope
Excavated:10ft by 4ft Eroded:10ft by 4ft Present:10ft by 4ft
Depth:10 feet ft Lining:Rock Drainage:No
Modified Machine Backfill
Section 2 465506 4428556
Install 5 CY of polyurethane foam inside opening to support bridge. Backfill both sides of opening with onsite material. Use large rocks on site.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five
(25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.
363- GF007b Stope
Excavated:3ft by 5ft Eroded:3ft by 5ft Present:3ft by 5ft Depth:10 feet ft
Lining:Rock Drainage:No
Modified Machine Backfill
Section 2 465497 4428550
Install 5 CY of polyurethane foam inside opening to support bridge. Backfill both sides of opening with onsite material. Use large rocks on site.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five
(25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.
363- GF007c Stope
Excavated:3ft by 5ft Eroded:3ft by 5ft Present:3ft by 5ft Depth:10 feet ft
Lining:Rock Drainage:No
Machine Backfill Section 2 465492
4428546
Backfill trench and stope with large onsite rocks and material.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five
(25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.
363-GF008 Stope
Excavated:50ft by 1ft Eroded:50ft by 5.5ft Present:50ft by 5.5ft
Depth:65 feet ft Lining:Rock Drainage:No
Shaft Grate w/ Bat Cupola
Section 8, Std.
Drawing # 4 and
Attachment 3
465469 4428544
Stope ranges in width from 3 to 10 ft.
Install a grated shaft closure with a bat cupola in accordance with Grated Shaft Closure Specifications.
The modified bat gate will be a raised four (4) sided ‘cupola’ consisting of one (1), six inch (6”) high by twenty-four inch (24”) wide bat slot on each side. One
(1) ten-foot (10’) W4 x 13 steel beam is required.
Incompetent, weak and failing rock will need to be barred down prior to any work. Access Door NOT required.
Description of Mine
Opening Closure Method
General Bid Specifications and Drawings
UTM
(X,Y)
NAD83 Work Description / Notes
363-GF009 Stope
Eroded:20ft by 40ft Present:13ft by 22ft
Depth:100 ft ft Lining:Rock Drainage:No
Shaft Grate w/ 2 Bat Cupolas
Section 8, Std.
Drawing # 4 and
Attachment 3
465538 4428565
Install a grated shaft closure with a bat cupola in accordance with Grated Shaft Closure Specifications.
Two (2) modified bat gates are required and will be a raised four (4) sided ‘cupola’ consisting of one (1), six inch (6”) high by twenty-four inch (24”) wide bat slot on each side. Two (2) fifteen foot (15’) W6 x 20 steel beams are required. Access Door NOT required.
363-GF010 Adit/ Decline
Excavated:5ft by 2ft Eroded:5ft by 2ft Present:5ft by 2ft
Depth:5 ft ft Lining:Concrete
Drainage:No
Grate with Bat Grate Alternative
Section 11 Section 13
Std. Drawing #s
6.1 & 6.2
465473 4428548
Construct a grated adit closure with a minimum two (2) foot by four (4) foot bat ladder in accordance with Grated Adit Closure Specifications. Neither an access door nor drainpipe are required.
363- GF010a
Adit/ Decline
Excavated:5ft by 2ft Eroded:5ft by 2ft Present:5ft by 2ft
Depth:8 ft Lining:Concrete
Drainage:No
Rock Bulkhead
Section 14 Std.
Drawing # 10
465472 4428594
The foundation shall be cleared of all unconsolidated material prior to construction of the bulkhead.
Construct a bulkhead seal of grouted durable native rock, a minimum of thirty inches (30”) in thickness.
Drainpipe IS required. Access door is NOT required.
363-GF012 Shaft
Excavated:4ft by 8ft Eroded:17ft by 35ft Present:15ft by 25ft
Depth:14 feet ft Lining:Rock
Drainage:Yes
Machine Backfill Section 2 465645
4428649
Collapse sides of opening to reduce highwall. Leave wood/brush debris. Sixty cubic yards (60cy) of imported common fill required.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five
(25) linear feet of biodegradable waddles shall be
Description of Mine
Opening Closure Method
General Bid Specifications and Drawings
UTM
(X,Y)
NAD83 Work Description / Notes
363-GF013 Adit
Excavated:8ft by 7ft Eroded:9ft by 9ft Present:9ft by 9ft Depth:17 feet ft
Lining:Rock Drainage:No
Grated Corrugated Steel Pipe w/ Bat Access
Section 10 Section 13
Std. Drawings # 5 & 6.2
465690 4428641
After clearing all loose debris, install a thirty-six (36) inch diameter ten (10) foot length of twelve (12) gauge corrugated steel pipe (CSP) with bat ladder in accordance with Corrugated Steel Pipe Adit Specifications and Bat Grate Alternative. Access door is NOT required. Drainpipe is NOT required. Rock grouting around the CSP IS required. The CONTRACTOR shall cover the CSP with onsite soil bedding prior to backfill and to reduce the likelihood of damage to the CSP by falling rock from the brow. In addition, the exterior of the CSP shall be backfilled using onsite material
363-GF015 Shaft
Excavated:8ft by 5ft Eroded:10ft by 10ft Present:10ft by 10ft
Depth:10 ft Lining:Rock
Drainage:Yes
Machine Backfill Section 2 465714
4428570
Excavate to determine extents. Machine backfill with onsite material. Rockfill is not required.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five
(25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.
363- GF015a
Adit/ Decline
Excavated:4ft by 5ft Eroded:2ft by 3ft Present:2ft by 3ft
Depth:10 ft Lining:Rock
Drainage:Yes
Rock Bulkhead
Section 14 Std.
Drawing # 10
465731 4428572
The foundation shall be cleared of all unconsolidated material prior to construction of the bulkhead.
Construct a bulkhead seal of grouted durable native rock, a minimum of thirty inches (30”) in thickness.
Drainpipe IS required. Access door is NOT required.
363-GF016 Adit
Excavated:3ft by 1.5ft Eroded: 3ft by 1.5ft Present: 3ft by 1.5ft
Depth:14 ft Lining:Rock Drainage:No
Rock Bulkhead w/ Bat Ladder
Section 14 Section 13
Std. Drawing #s
6.2 & 10
465737 4428520
The foundation shall be cleared of all unconsolidated material prior to construction of the bulkhead.
Construct a Rock Bulkhead closure with Bat Grate Alternative. Utilize a minimum three (3) foot length of thirty-six (36) inch, twelve (12) gauge CSP with an attached bat ladder.
Neither an access door nor drainpipe are required.
Description of Mine
Opening Closure Method
General Bid Specifications and Drawings
UTM
(X,Y)
NAD83 Work Description / Notes
GF017 Stope
Excavated:5ft by 3ft Eroded:5ft by 3ft Present:5ft by 3ft Depth:20-30ft ft
Lining:Rock Drainage:No
Machine Backfill Section 2 465671
4428646
BAT EXCLUSION PRIOR TO CLOSING PER SPEC
PROVIDED UNDER ITEM 4.0.
Excavate to determine extent of opening. Backfill with onsite material. Rockfill is not required.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five
(25) linear feet of biodegradable waddles shall be installed on the downstream side of the working area under the direction of the PROJECT MANAGER.
W-1 Stope
Excavated:5ft by 3ft Eroded:13ft by 13ft Present:5ft by 3ft
Depth:N/A ft Lining:Rock Drainage:No
Machine Backfill Section 2 469855
4429753
Excavate to determine extent of opening. Backfill with onsite material. Rockfill is not required.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five
(25) linear feet of biodegradable waddles shall be
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