A#2 Attch.1_Querida-QueridaPhase2_REVISEDFeatureList.pdf
PDF 129 KB Posted
- Attached to
- PKAA, Querida Phase 2 Project
- Solicitation number
- DQ1 PKAA 2026000299 3
- Issued by
- Colorado
About this file
This is a revised feature work list attachment for the PKAA Querida Phase 2 Project in Colorado, detailing mine opening closure specifications and requirements. The document provides comprehensive information on eleven guaranteed closure projects and two contingent projects involving various mine features including prospect shafts, adits, and other excavations requiring remediation. The work encompasses multiple closure methods including machine backfill, corrugated steel pipe installations with bat ladders, bat grate sections, polyurethane foam closures, and steel grated shaft closures. Features range in size from small prospect shafts to large openings exceeding 29 feet by 31 feet, with depths varying from 7 feet to over 100 feet. All features include specific locations identified by UTM coordinates in NAD83 format, with detailed work descriptions and material requirements specified for each closure method.
The scope includes extensive stormwater sediment control measures requiring excelsior waddles installation on the downstream side of working areas, with quantities ranging from 25 to 50 linear feet per feature. Specific projects require additional materials such as 23 cubic yards of imported rockfill for feature Q02, concrete footers and W6x20 steel beams for the steel grated shaft closure at TH01, and 50 cubic yards of polyurethane foam for feature Q07. Road grading totaling 176 linear yards is necessary to access features TH01 and TH02. The document distinguishes between guaranteed work items presented in Table 1 and two not-guaranteed contingent features in Table 2, allowing for flexible project scope based on final site conditions and assessment.
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Text version
Attachment 1
Table 1: Item 4.0 Querida - Querida Phase 2 – Feature Work List REVISED
Feature ID Type Description of Mine Opening
Closure Method
General Bid Specifications and
Drawings
UTM
(X,Y) NAD83 Work Description / Notes
KH02 Prospect Shaft
Excavated:
Eroded:12ft by 14ft
Present:12ft by 14ft
Depth:14 ft Lining:N/A
Drainage:No
Machine Backfill SWS 2 470342.96199972, 4220059.09132914
Machine Backfill with onsite material. No Rockfill is required.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) linear feet of excelsior waddles shall be installed on the downstream side of the working area under the direction of the PROJECT
MANAGER.
KH03
Prospect Shaft
Excavated:8ft by 4ft
Eroded:9ft by 5ft Present:9ft by 5ft
Depth:7 ft Lining:N/A
Drainage:No
Machine Backfill
SWS 2
470350.029071669
4220060.91476284
Machine Backfill with onsite material. No Rockfill is required.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) linear feet of excelsior waddles shall be installed on the downstream side of the working area under the direction of the PROJECT
MANAGER.
MT01 Adit
Excavated:4ft by 3ft
Eroded:7ft by 3ft Depth:100 ft Lining:Rock Drainage:No
Grated Corrugated Steel Pipe w/ Bat Ladder
SWS 10, 13
Drawing(s) 5, 6.2
470828.940524799 4220270.92483496
Excavate to determine extents. Install a 36-inch diameter twenty-foot (20 ft) length of twelve-gauge (12 ga.) corrugated steel pipe (CSP) with bat ladder in accordance with Corrugated Steel Pipe Specifications and Bat Grate Alternative. Approximately 5 feet of CSP will be set inside the opening.
Access door is required. The front 3 feet of backfill of the space between the Corrugated Steel Pipe and adit walls requires concreted durable rock that is a minimum of 4 inches in diameter. Drain pipe is NOT required.
Description of Mine Opening
Closure Method
General Bid Specifications and
Drawings
UTM
(X,Y) NAD83 Work Description / Notes
MT02 Adit
Excavated:8ft by 5ft
Eroded:6ft by 3ft Present:6ft by 3ft
Depth:20 ft Lining:Rock Drainage:No
Grated Corrugated Steel Pipe w/ Bat Ladder
SWS 10, 13
Drawing(s) 5, 6.2
470752.95985247, 4220196.9185069
Excavate to determine extents. Install a 36-inch diameter ten foot (10 ft) length of twelve-gauge (12 ga.) corrugated steel pipe (CSP) with bat ladder in accordance with Corrugated Steel Pipe Specifications and Bat Grate Alternative. Approximately 5 feet of CSP will be set inside the opening.
Access door is required. The front 3 feet of backfill of the space between the Corrugated Steel Pipe and adit walls requires concreted durable rock that is a minimum of 4 inches in diameter. Drain pipe is NOT required.
Q01 Prospect Shaft
Excavated:
Eroded:17ft by 18ft
Present:17ft by 18ft
Depth:8 ft Lining:Rock Drainage:No
Machine Backfill SWS 2
471020.376756398
4219746.89630656
Machine Backfill with onsite material. No Rockfill is required.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) linear feet of excelsior waddles shall be installed on the downstream side of the working area under the direction of the PROJECT
MANAGER.
Q02 Shaft
Excavated:
Eroded:29ft by 31ft
Present:29ft by 31ft
Depth:12 ft Lining:Rock Drainage:No
Machine Backfill SWS 2
471194.101324968
4219646.11034739
Machine Backfill with onsite material.
Twenty-three (23) cubic yards of imported rock fill required then topped with on-site material.
Storm water sediment control measures shall be implemented prior to work on the closure. Fifty (50) linear feet of excelsior waddles shall be installed on the downstream side of the working area
Description of Mine Opening
Closure Method
General Bid Specifications and
Drawings
UTM
(X,Y) NAD83 Work Description / Notes
Q03 Prospect Shaft
Excavated:
Eroded:21ft by 20ft
Present:21ft by 20ft
Depth:12 ft Lining:Rock +
Timber Drainage:No
Machine Backfill SWS 2 470531, 4219595
Remove branches and set aside. Machine Backfill with onsite material. No Rockfill is required.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) linear feet of excelsior waddles shall be installed on the downstream side of the working area under the direction of the PROJECT
MANAGER.
Q05 Adit
Excavated:
Eroded:16ft by 40ft
Present:16ft by 40ft
Depth:10 ft Lining:Rock Drainage:No
Machine Backfill SWS 2
470477.025762403
4219693.98857082
Trim surrounding tree branches to remove and potential fire danger.
Machine Backfill with onsite material. No Rockfill is required.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) linear feet of excelsior waddles shall be installed on the downstream side of the working area under the direction of the PROJECT
MANAGER.
Q06 Adit
Excavated:
Eroded:3ft by 5ft Present:3ft by 5ft
Depth:Unk ft Lining:Rock Drainage:No
Bat Grate
Section 11.0, Standard Drawing #6, Section 13.0, Standard Drawing
#6-2
470271.098682744
4219647.89025095
Remove door and set aside.
Construct a grated adit closure with a full-length bat ladder in accordance with Grate Adit Closure Specifications. An access door is not required. Drainpipes are not required.
Q07 Shaft
Excavated:8ft by 4ft
Eroded:20ft by 12ft Present:14ft by
10ft Depth:30+ ft Lining: Rock Drainage:No
Polyurethane Foam
Section 9.0 – Polyurethane Foam
Closure.
470252.940980377
4219676.00396547
Install a closure using Polyurethane Foam (PUF). Bottom form is NOT required. Fifty cubic yards (50CY) of PUF will be needed to plug the feature. The PUF will be allowed to cure for four (4) days prior to backfill. Hand backfill over PUF using on-site material.
Description of Mine Opening
Closure Method
General Bid Specifications and
Drawings
UTM
(X,Y) NAD83 Work Description / Notes
TH01 Prospect Shaft
Excavated:13ft by 13ft
Eroded:18ft by 21ft Present:18ft by
21ft Depth:17 ft Lining:Rock Drainage:No
Steel Grated Shaft
Closure
Section 8.0 and Standard Drawing
#4
470199.94715346, 4219898.11075867
One hundred and seventy-six (176) linear yards of road grading is necessary to reach features TH01 and TH02. No imported fill is required.
Install a twenty-foot (20ft) by twenty-foot (20ft) steel grated shaft closure with concrete footers. Poor rock condition at the collar will require concrete footers. Three
(3) W6x20 steel beams are required. A bat cupola is NOT required.
Table 2: Item 5.0 Querida - Querida Phase 2 – Feature Work List REVISED – NOT GUARANTEED
Description of Mine Opening
Closure Method
General Bid Specifications and
Drawings
UTM
(X,Y) NAD83 Work Description / Notes
Q04 Prospect Shaft
Excavated:
Eroded:25ft by 27ft
Present:25ft by 27ft
Depth:10 ft Lining:Rock Drainage:No
Machine Backfill SWS 2
470441.615768645
4219805.38166667
Machine Backfill with onsite material. No Rockfill is required.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) linear feet of excelsior waddles shall be installed on the downstream side of the working area under the direction of the PROJECT
MANAGER.
TH02 Prospect Shaft
Excavated:
Eroded:26ft by 21ft
Present:26ft by 21ft
Depth:10 ft Lining:Rock Drainage:No
Machine Backfill SWS 2
470187.042494516
4219897.84981193
One hundred and seventy-six (176) linear yards of road grading is necessary to reach features TH01 and TH02. No imported fill is required.
Machine Backfill with onsite material. No Rockfill is required.
Storm water sediment control measures shall be implemented prior to work on the closure. Twenty-five (25) linear feet of excelsior waddles shall be installed on the downstream side of the working area
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