5-Appendix 1-Item 4.0 Feature Worktable.pdf
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- Attached to
- PKAA, Dream Canyon Project
- Solicitation number
- DQ1 PKAA 2026000355 4
- Issued by
- Boulder County, Colorado
About this file
This is an Appendix to a Scope of Work for the Dream Canyon Project in Colorado, detailing mine closure specifications and work requirements. The document presents a comprehensive feature work table for Item 4.0, which involves the installation of mine closures at 21 distinct mine openings across the project site. The work encompasses three primary closure methodologies: machine backfill for shafts and stopes, rock bulkhead construction with bat access features for adits, and grated shaft closures with bat cupolas for larger openings. Mine features range in depth from 5 feet to 100 feet, with opening sizes varying from 2 feet by 3 feet to 50 feet by 35 feet. Each feature is assigned a unique identifier, UTM coordinates using NAD83 datum, and specific closure method designation with references to detailed specifications and standard drawings provided elsewhere in the contract documents.
Work descriptions emphasize environmental protection and wildlife considerations, with all machine backfill closures requiring pre-work bat exclusion protocols and stormwater sediment control measures, including installation of 25 linear feet of biodegradable waddles downstream of work areas under project manager supervision. Specialized closures such as rock bulkheads require foundation clearing and minimum 30-inch thickness grouted native rock construction, while grated shaft closures with bat cupolas incorporate modified bat gates with six-inch by 24-inch bat slots and structural steel beams rated to support opening spans. Several features require imported fill materials, including 60 cubic yards for Feature 363-GF012 and 5 cubic yards of polyurethane foam for Features 363-GF007a and 363-GF007b to support bridge structures. All work is subject to competent rock assessment with requirement for barring down weak or failing rock prior to closure installation.
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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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