Appendix A Switzerland Park Project Tables.pdf
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- Attached to
- PKAA, Switzerland Park Project
- Solicitation number
- DQ1 PKAA 2027000077 2
- Issued by
- Colorado
About this file
This file is Appendix A of the Switzerland Park Project scope of work, detailing mine closure specifications for a Colorado reclamation initiative. The project encompasses the closure of 34 mine features (adits, shafts, and stopes) at Switzerland Park through various closure methods including machine backfill, grated closures with bat ladders, corrugated steel pipe installations, rock bulkheads, and exclusion fencing. The project includes site-specific work descriptions with UTM coordinates (NAD83), feature dimensions ranging from 2 feet by 4 feet to 34 feet by 100 feet in opening size, and depths varying from 7 feet to 100+ feet. Closure methods are standardized according to referenced specification sections (Section 2.0 for backfill closures, Section 8.0 for steel grated shaft closures, Section 10.0 for corrugated steel pipe, Section 11.0 for grated adit closures, Section 13.0 for bat grate alternatives, Section 14.0 for rock bulkhead closures, and Section 17.0 for chain-link exclusion fencing). Multiple features require bat exclusion protocols prior to closure work, with specific provisions for three-day pre-closure chicken wire coverage to allow safe bat egress.
Environmental and sediment control requirements are integrated throughout the project specifications, with 25 to 50 linear feet of excelsior wattles mandated for most closure features to address stormwater runoff on the downgradient side of work areas. Notable project elements include ten cubic yards of imported riprap for one feature (SP34), removal and proper disposal of existing infrastructure such as timbers, headframes, and barbed-wire fencing at designated locations, and contractor responsibility for obtaining Colorado Department of Transportation (CDOT) permits for SP30. The project prioritizes environmental protection and wildlife habitat preservation, particularly regarding bat conservation through specialized grating systems and exclusion procedures. Several features are noted as requiring bat reports (SP33 and SP34), indicating that baseline biological assessment may be prerequisite to final closure specifications. On-site material is designated as the primary backfill source, minimizing imported material requirements except where riprap is specifically mandated.
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Appendix A
Switzerland Park Project Table
Table 1 – Item 4.0 - Install Mine Closures
*Bat Exclusion Protocol:
The mine opening shall be covered for a minimum of three (3) days prior to the closure work starting with one-inch chicken wire. The chicken wire should cover the portal from the top to about 5-6” from the floor or bottom of the portal/entry. This will help prevent bats from entering the mine and allow any bats inside the mine prior to the exclusion effort, to escape from the mine before the closure operations.
If reclamation work is delayed after an exclusion was conducted, use a tarp to cover the opening until work can be re-started and completed. This will help prevent re-use by bats during the stopping of closure work.
Switzerland Park – Feature Work List
Table 1 – Item 4.0 - Install Mine Closures - New Features
Featur e ID Type
Bat Report
Description of Mine Opening
Closure Method
General Bid Specifications and Drawings
UTM
(X,Y)
NAD83 Work Description / Notes SP01 Adit Potential
Habitat, Bat
Grate
Present:5ft by 6ft
Depth:50 ft Lining:Rock Drainage:No
Grate with Bat Grate Alternative
Section 11.0 - Grated Adit
Closure
Section 13.0 - Bat Grate Alternative
Std. Drawings #6 & 6.2
461743, 4427443
INSTALL a grated adit closure with a minimum two (2) foot by four (4) foot bat ladder in accordance with Grated Adit
Closure Specifications.
Access door and drainpipe are NOT required.
Stormwater sediment control measures are
NOT required.
SP02 Adit Bat
Grate Present:4ft by 4ft Depth:50 ft Lining:Rock Drainage:No
Grate with Bat Grate Alternative
Section 11.0 - Grated Adit
Closure Section 13.0 -
Bat Grate Alternative
Std. Drawings #6 & 6.2
461862, 4427315
INSTALL a grated adit closure with a minimum two (2) foot by four (4) foot bat ladder in accordance with Grated Adit
Closure Specifications.
Access door and drainpipe are NOT required.
Stormwater sediment control measures are
NOT required.
SP03 Adit Potential
Habitat, Bat
Grate
Excavated:6f t by 6ft
Eroded:4ft by 3ft
Present:5ft by 6ft
Depth:50 ft Lining:Rock Drainage:No
Grate with Bat Grate Alternative
Section 11.0 - Grated Adit
Closure
Section 13.0 - Bat Grate Alternative
Std. Drawings #6 & 6.2
461846, 4427302
INSTALL a grated adit closure with a minimum two (2) foot by four (4) foot bat ladder in accordance with Grated Adit
Closure Specifications.
Access door and drainpipe are NOT required.
Stormwater sediment control measures are NOT required.
Featur e ID Type
Bat Report
Description of Mine Opening
Closure Method
General Bid Specifications and Drawings
UTM
(X,Y)
NAD83 Work Description / Notes SP04 Stope Exclude and Close
Present:8ft by 10ft
Depth:50 ft Lining:Rock Drainage:No
Shaft Grate Section 8.0 - Steel Grated Shaft Closure
461817, 4427229
*EXCLUDE bats prior to closing.
INSTALL a grated shaft closure in accordance with Grated Shaft Closure Specifications.
Access door, drainpipe and bat access are NOT required.
Stormwater sediment control measures are NOT required.
SP05 Adit/ Incline
Close Present:3ft by 3ft
Depth:30 ft Lining:Rock Drainage:No
Grated Corrugated Steel Pipe
Section 10.0 - Corrugated
Steel Pipe Adit Closure
461812, 4427223
CLEAR loose debris.
INSTALL a thirty-six (36) inch diameter fifteen (15) foot length of twelve (12) gauge corrugated steel pipe (CSP) with grate in accordance with Corrugated Steel Pipe Adit Specifications.
Access door, drainpipe and bat access are NOT required.
Bulkhead or PUF around the CSP and hand backfilled with on-site material. The front three (3) feet of backfill shall consist of concreted durable rock.
Stormwater sediment control measures are
Featur e ID Type
Bat Report
Description of Mine Opening
Closure Method
General Bid Specifications and Drawings
UTM
(X,Y)
NAD83 Work Description / Notes SP06 Prospec t Adit Close Present:4ft by 4ft Depth:15 ft Lining:Rock Drainage:No
Machine Backfill
Section 2.0 - Backfill Closure
461793, 4427209
Machine BACKFILL in accordance with Backfill Closure Specifications with on-site material. Rock fill NOT required.
Stormwater sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) feet of excelsior wattles shall be installed on the downgradient side of the working area.
SP07 Shaft Close Eroded:20ft by 14ft
Present:10ft by 6ft
Depth:18 ft Lining:Rock Drainage:No
Machine Backfill
Section 2.0 - Backfill Closure
461732, 4427171
Machine BACKFILL in accordance with Backfill Closure Specifications with on-site material. Rock fill NOT required.
Machine BACKFILL in accordance with
Backfill Closure Specifications with on-site material.
Stormwater sediment control measures shall be implemented prior to work on the closure.
Twenty-five (25) feet of excelsior wattles shall be installed on the downgradient side of the working area.
Featur e ID Type
Bat Report
Description of Mine Opening
Closure Method
General Bid Specifications and Drawings
UTM
(X,Y)
NAD83 Work Description / Notes SP08 Stope Close Eroded:24ft by 12ft Present:20ft by 6ft Depth:25 ft Lining:Rock Drainage:No
Machine Backfill
Section 2.0 - Backfill Closure
461733, 4427185
Machine BACKFILL in accordance with Backfill Closure Specifications with on-site material. Rock fill NOT required. .
Stormwater sediment control measures shall be implemented prior to work on the closure.
Twenty-five (25) feet of excelsior wattles shall be installed on the downgradient side of the working area.
SP09 Shaft Close Present:5ft by 5ft Depth:7 ft
Lining:Rock Drainage:No
Machine Backfill
Section 2.0 - Backfill Closure
442722, 4427170
Machine BACKFILL in accordance with Backfill Closure Specifications with on-site material. Remove all vegetation and woody debris. Rock fill NOT required.
Mine dump located 25' to east at 39.993964, -105.448751
Stormwater sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) feet of excelsior wattles shall be installed on the downgradient side of the working area.
Featur e ID Type
Bat Report
Description of Mine Opening
Closure Method
General Bid Specifications and Drawings
UTM
(X,Y)
NAD83 Work Description / Notes SP10 Stope Close Present:16ft by 7ft Depth:20 ft Lining:Rock Drainage:No
Machine Backfill
Section 2.0 - Backfill Closure
461675, 4427160
Machine BACKFILL in accordance with Backfill Closure Specifications with on-site material. Rock fill NOT required.
Use mine dump above highwall and rock from stope highwall for backfill.
Stormwater sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) feet of excelsior wattles shall be installed on the downgradient side of the working area.
SP11 Stope Close Present:200ft by 25ft
Depth:30 ft Lining:Rock Drainage:No
Exclusion Fence
Section 17.0 - Chain-LInk
Fencing (Modified)
461792, 4427278
INSTALL five-hundred (500) linear feet (LF) of exclusion fence around the perimeter of the stope with steel posts as described in
Appendix B - Exclusion Fencing Specifications
Stormwater sediment control measures are
Featur e ID Type
Bat Report
Description of Mine Opening
Closure Method
General Bid Specifications and Drawings
UTM
(X,Y)
NAD83 Work Description / Notes SP12 Shaft Close Present:10ft by 6ft Depth:10 ft Lining:Rock Drainage:No
Machine Backfill
Section 2.0 - Backfill Closure
461746, 4427341
REMOVE headframe and set aside neatly.
Machine BACKFILL in accordance with Backfill Closure Specifications with on-site material. Rock fill NOT required.
Stormwater sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) feet of excelsior wattles shall be installed on the downgradient side of the working area.
SP13 Adit Close Present:3ft by 3ft
Depth:10 ft Lining:Rock Drainage:No
Machine Backfill
Section 2.0 - Backfill Closure
461557, 4427302
Machine BACKFILL in accordance with Backfill Closure Specifications with on-site material. Standing water in adit observed.
Rock fill NOT required.
Stormwater sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) feet of excelsior wattles shall be installed on the
Featur e ID Type
Bat Report
Description of Mine Opening
Closure Method
General Bid Specifications and Drawings
UTM
(X,Y)
NAD83 Work Description / Notes SP14 Adit Bat
Grate Present:5ft by 6ft Depth:40 ft Lining:Rock Drainage:No
Grate with Bat Grate Alternative
Section 11.0 - Grated Adit
Closure
Section 13.0 - Bat Grate Alternative
Std. Drawings #6 & 6.2
461373, 4427346
INSTALL a grated adit closure with a minimum two (2) foot by four (4) foot bat ladder in accordance with Grated Adit
Closure Specifications.
Access door and drainpipe are NOT required.
Stormwater sediment control measures are NOT required.
SP15 Prospec t Shaft
Close Present:13ft by 16ft
Depth:12 ft Lining:Rock Drainage:No
Machine Backfill
Section 2.0 - Backfill Closure
461615, 4427372
Machine BACKFILL in accordance with Backfill Closure Specifications with on-site material. Rock fill NOT required.
Stormwater sediment control measures shall be implemented prior to work on the closure.
Twenty-five (25) feet of excelsior wattles shall be installed on the downgradient side of the working area.
Featur e ID Type
Bat Report
Description of Mine Opening
Closure Method
General Bid Specifications and Drawings
UTM
(X,Y)
NAD83 Work Description / Notes SP16 Shaft Exclude and Close
Present:10ft by 12ft
Depth:22 ft Lining:Rock Drainage:No
Machine Backfill
Section 2.0 - Backfill Closure
461494, 4427326
*EXCLUDE bats prior to closing.
Machine BACKFILL in accordance with Backfill Closure Specifications with on-site material. Rock fill NOT required.
Stormwater sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) feet of excelsior wattles shall be installed on the downgradient side of the working area.
SP17 Prospec t Shaft
Close Present:11ft by 14ft
Depth:15 ft Lining:Rock Drainage:No
Machine Backfill
Section 2.0 - Backfill Closure
461488, 4427326
Machine BACKFILL in accordance with Backfill Closure Specifications with on-site material. Rock fill NOT required.
Machine BACKFILL in accordance with Backfill Closure Specifications with on-site material.
Stormwater sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) feet of excelsior wattles shall be installed on the
Featur e ID Type
Bat Report
Description of Mine Opening
Closure Method
General Bid Specifications and Drawings
UTM
(X,Y)
NAD83 Work Description / Notes SP18 Stope Close Present:11ft by 32ft Depth:25 ft Lining:Rock Drainage:No
Machine Backfill
Section 2.0 - Backfill Closure
461452, 4427327
Machine BACKFILL in accordance with Backfill Closure Specifications with on-site material. Rock fill NOT required.
Stormwater sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) feet of excelsior wattles shall be installed on the downgradient side of the working area.
SP19 Adit Close Present:10ft by 8ft
Depth:18 ft Lining:Rock Drainage:No
Machine Backfill
Section 2.0 - Backfill Closure
461270, 4427235
Machine BACKFILL in accordance with Backfill Closure Specifications with on-site material. Rock fill NOT required.
Stormwater sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) feet of excelsior wattles shall be installed on the downgradient side of the working area.
SP20 Prospec t Adit
Close Present:13ft by 12ft
Depth:20 ft Lining:Rock Drainage:No
Machine Backfill
Section 2.0 - Backfill Closure
461254, 4427220
Machine BACKFILL in accordance with Backfill Closure Specifications with on-site material. Rock fill NOT required.
Stormwater sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) feet of excelsior wattles shall be installed on the
Featur e ID Type
Bat Report
Description of Mine Opening
Closure Method
General Bid Specifications and Drawings
UTM
(X,Y)
NAD83 Work Description / Notes SP21 Adit Exclude and Close
Present:10ft by 8ft
Depth:20 ft Lining:Rock Drainage:No
Bulkhead Section 14.0 - Rock Bulkhead
Closure
461244, 4427205
SP21 connects with SP20.
REMOVE mining debris and set aside neatly.
*EXCLUDE bats prior to closing.
EXCAVATE to solid ground and INSTALL a rock bulkhead closure with on-site rock. A drain pipe is NOT required.
Stormwater sediment control measures are NOT required.
SP22 Stope Potential Habitat, Bat Grate
Present:12ft by 6ft
Depth:18.5 ft Lining:Rock Drainage:No
Grate with Bat Grate Alternative
Section 11.0 - Grated Adit
Closure
Section 13.0 - Bat Grate Alternative
Std. Drawings #6 & 6.2
461241, 4427206
INSTALL a grated adit closure with a minimum two (2) foot by four (4) foot bat ladder in accordance with Grated Adit
Closure Specifications.
Access door and drainpipe are NOT required.
Stormwater sediment control measures are
Featur e ID Type
Bat Report
Description of Mine Opening
Closure Method
General Bid Specifications and Drawings
UTM
(X,Y)
NAD83 Work Description / Notes SP23 Stope Exclude and Close
Present:6ft by 4ft
Depth:15 ft Lining:Rock Drainage:No
Machine Backfill
Section 2.0 - Backfill Closure
461322, 4427253
*EXCLUDE bats prior to closing.
Machine BACKFILL in accordance with Backfill Closure Specifications with on-site material. Rock fill NOT required.
Stormwater sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) feet of excelsior wattles shall be installed on the downgradient side of the working area.
SP24 Stope Close Present:4ft by 2ft
Depth:10 ft Lining:Rock Drainage:No
Machine Backfill
Section 2.0 - Backfill Closure
461347, 4427288
Machine BACKFILL in accordance with Backfill Closure Specifications with on-site material. Rock fill NOT required.
Stormwater sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) feet of excelsior wattles shall be installed on the
Featur e ID Type
Bat Report
Description of Mine Opening
Closure Method
General Bid Specifications and Drawings
UTM
(X,Y)
NAD83 Work Description / Notes SP25 Stope Close Present:10ft by 12ft Depth:10 ft Lining:Rock Drainage:No
Machine Backfill
Section 2.0 - Backfill Closure
461338, 4427285
Machine BACKFILL in accordance with Backfill Closure Specifications with on-site material. Rock fill NOT required.
Stormwater sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) feet of excelsior wattles shall be installed on the downgradient side of the working area.
SP26 Stope Close Present:13.5f t by 100ft
Depth:40 ft Lining:Rock Drainage:No
Exclusion Fence
Section 17.0 - Chain-LInk
Fencing (Modified)
461374, 4427304
INSTALL two-hundred fifty (250) linear feet (LF) of exclusion fence around the perimeter of the stope with steel posts as described in Appendix B - Exclusion
Fencing Specifications.
Stormwater sediment control measures are
Featur e ID Type
Bat Report
Description of Mine Opening
Closure Method
General Bid Specifications and Drawings
UTM
(X,Y)
NAD83 Work Description / Notes SP27 Shaft Close Present:10ft by 22ft Depth:25 ft Lining:Rock Drainage:No
Machine Backfill
Section 2.0 - Backfill Closure
461530, 4427305
Machine BACKFILL in accordance with Backfill Closure Specifications with on-site material. Rock fill NOT required.
Stormwater sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) feet of excelsior wattles shall be installed on the downgradient side of the working area.
SP28 Adit Potential Habitat, Bat Grate
Present:6ft by 6ft
Depth:40 ft Lining:Rock Drainage:No
Grate with Bat Grate Alternative
Section 11.0 - Grated Adit
Closure
Section 13.0 - Bat Grate Alternative
Std. Drawings #6 & 6.2
462828, 4428092
INSTALL a grated adit closure with a minimum two (2) foot by four (4) foot bat ladder in accordance with Grated Adit
Closure Specifications.
Access door and drainpipe are NOT required.
Stormwater sediment control measures are
Featur e ID Type
Bat Report
Description of Mine Opening
Closure Method
General Bid Specifications and Drawings
UTM
(X,Y)
NAD83 Work Description / Notes SP29 Shaft Close Present:10ft by 12ft Depth:15 ft Lining:Rock Drainage:No
Machine Backfill
Section 2.0 - Backfill Closure
461411, 4430059
Machine BACKFILL in accordance with Backfill Closure Specifications with on-site material. Rock fill NOT required.
Stormwater sediment control measures shall be implemented prior to work on the closure. Fifty (50) feet of excelsior wattles shall be installed on the downgradient side of the working area.
SP30 Adit Potential
Habitat, Bat
Grate
Present:7ft by 5ft
Depth:100+ ft Lining:Rock Drainage:No
Grate with Bat Grate Alternative
Section 11.0 - Grated Adit
Closure
Section 13.0 - Bat Grate Alternative
Std. Drawings #6 & 6.2
4603648, 4425147
CDOT permits are REQUIRED and are the CONTRACTOR’S responsibility to obtain and comply with.
INSTALL a grated adit closure with a minimum two (2) foot by four (4) foot bat ladder in accordance with Grated Adit
Closure Specifications.
An access door is NOT required.
Stormwater sediment control measures are
Featur e ID Type
Bat Report
Description of Mine Opening
Closure Method
General Bid Specifications and Drawings
UTM
(X,Y)
NAD83 Work Description / Notes SP31 Shaft Close Present:12ft by 4ft Depth:10 ft Lining:Rock Drainage:No
Machine Backfill
Section 2.0 - Backfill Closure
463436, 4429090
REMOVE timbers and debris and dispose at an approved landfill facility.
Machine BACKFILL in accordance with Backfill Closure Specifications with on-site material. The depression (8’L x 6’W x 3’D) adjacent to the feature shall be backfilled to provide an excavator work area. Rock fill
NOT required.
REMOVE and DISPOSE of existing barbed-wire fence.
Stormwater sediment control measures shall be implemented prior to work on the closure. Fifty (50) feet of excelsior wattles shall be installed on the downgradient side of the working area.
Featur e ID Type
Bat Report
Description of Mine Opening
Closure Method
General Bid Specifications and Drawings
UTM
(X,Y)
NAD83 Work Description / Notes SP32 Shaft Close Present:13ft by 9ft Depth:10 ft Lining:Rock Drainage:No
Machine Backfill
Section 2.0 - Backfill Closure
461712, 4427175
REMOVE timbers and set aside neatly.
Machine BACKFILL in accordance with Backfill Closure Specifications with on-site material. Rock fill NOT required.
Stormwater sediment control measures shall be implemented prior to work on the closure. Fifty (50) feet of excelsior wattles shall be installed on the downgradient side of the working area.
SP33 Stope Close - Need Bat
Report
Present:26ft by 19ft
Depth:8 ft Lining:Rock Drainage:No
Machine Backfill
Section 2.0 - Backfill Closure
461666, 4427119
Machine BACKFILL in accordance with Backfill Closure Specifications with on-site material. Rockfill is NOT required.
The feature is partially backfilled with sediment from hillside / road erosion.
Stormwater sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) feet of excelsior wattles shall be installed on the
Featur e ID Type
Bat Report
Description of Mine Opening
Closure Method
General Bid Specifications and Drawings
UTM
(X,Y)
NAD83 Work Description / Notes SP34 Stope Close -
Need Bat
Report
Present:34ft by 19ft
Depth:10 ft Lining:Rock Drainage:No
Machine Backfill
Section 2.0 - Backfill Closure
461688, 4427133
INSTALL ten (10) cubic yards (CY) of imported riprap. The imported riprap material shall consist of hard, durable and well-graded material with a median diameter of approximately eighteen (18) inches and sufficient finer particles to minimize the presence of voids.
The feature is partially backfilled with sediment from hillside / road erosion.
The stope connects two adits. The west adit - 4'W x 6'H x 4" plug depth, east adit
8'W x 4'H x 4' plug depth.
Machine BACKFILL in accordance with Backfill Closure Specifications with on-site material.
Stormwater sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) feet of excelsior wattles shall be installed on the
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