AM1-Twin Sisters Revised Bid Schedule.pdf
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- Attached to
- PKAA, Twin Sisters Mine Closure Project
- Solicitation number
- DQ1 PKAA 2026000289 2
- Issued by
- Boulder County, Colorado
About this file
This is a revised bid schedule for the Twin Sisters Mine Closure Project (DQ1 PKAA 2026*0289) in Colorado, detailing the bidding requirements and line items for mine hazard mitigation work. The project encompasses multiple closure activities across various mine features including shafts, stopes, adits, and prospects owned by different entities (BCOS, USFS, and private parties). The bid schedule requires bidders to price eleven primary line items, including mobilization/demobilization, project safety and environmental planning, sediment control (675 linear feet), safeguarding hazardous mine features across multiple phases, and maintenance of existing features. Bidders must complete all pages of the bid schedule and provide pricing for guaranteed items as well as optional not-guaranteed items for additional imported rockfill, concrete, grates, machine time, and fill. The schedule lists 20 specific mine features in Item 4.0 (Safeguard Hazardous Mine Openings), 2 features in Item 5.0 (Maintenance Features), and 1 feature in Item 6.0 (Safeguard Additional Hazardous Mine Openings), with closure methods primarily utilizing machine backfill, grated CSP installations with bat ladders, bulkheads, and cap replacements. Bids must be submitted electronically via Colorado VSS, and all addenda acknowledgments must be documented.
The bid schedule requires bidders to provide per-unit or lump-sum pricing for all line items with blank fields for unit prices on sediment control, additional imported rockfill, concrete, grates, machine time, and additional fill. No specific contract term, award date, or pricing guidance is provided in this document. The not-guaranteed items (Items 7.0 through 11.0) indicate that these quantities may or may not be authorized for work, with bidders required to provide unit pricing for potential execution. The schedule notes that Items 8.0 and 9.0 have been deleted from the bid. Bidders are instructed not to amend any portion of the schedule and must return all pages with completed line items. The bid schedule is dated May 19, 2026 (Addendum 1 Revised) and references special conditions regarding alternative bid submittal methods should the Colorado VSS system become unavailable.
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Text version
Qty Unit Per Unit Price ($) Total Price ($)
Item 1.0 - Mobilize/Demobilize 1 Job N/A $
Item 2.0 - Project Safety, Health and Environmental Action Plan
1 Job N/A $
Item 3.0 - Sediment Control 675 LF $_______/LF $
Item 4.0 - Safeguard Hazardous Mine Features (See total from page 4)
1 Job N/A $
Item 5.0 - Maintenance Features (See total from page 5)
1 Job N/A $
Item 6.0 - Safeguard Addtl Hazardous Mine Features (See total from page 6)
1 Job N/A $
Item 7.0 - Additional Imported Rockfill
NOT GUARANTEED
5 CY $_______/CY $
Item 8.0 - Concrete NOT GUARANTEED 5 CY $_______/CY Item deleted from Bid
Item 9.0 - Additional Grate NOT
GUARANTEED
10 SF $_______/SF
Item deleted from Bid
Item 10.0 - Additional Machine Time NOT
GUARANTEED
10 CY $_______/CY $
Item 11.0 - Additional Imported Fill NOT
GUARANTEED
5 CY $_______/CY $
Grand Total: $
Am#1 Revised (5/19/2026) Bid Schedule Twin Sisters Mine Closure Project
DQ1 PKAA 2026*0289
Complete all pages in the spreadsheet as applicable.
Receipt of Addenda Nos.____________ is hereby acknowledged
Submit Bids via Colorado VSS at the following link: http://www.colorado.gov/vss
Submitting Bids by mail or fax is not permitted.
If VSS is unavailable, please see project Special Conditions for alternative Bid Submittal method.
Legal Business Name
Address
City, State Zip
Phone
Signer Printed Name
Title
Date
Offeror Information
Signature:
The Bid shall be signed by a person authorized to bind the Offeror.
Do not amend any part of this bid schedule all pages of this bid schedule must be returned all line items must be completed.
Feature ID Feature Type Closure Method Ownership Bid Amount ($)
AQ1 Shaft Machine Backfill BCOS
AQ2 Stope Machine Backfill BCOS
AQ3 Stope Machine Backfill BCOS
BC1 Prospect Shaft Machine Backfill BCOS
BC1a Adit/Incline Grated CSP w/ Bat Ladder BCOS
BC2 Prospect Shaft Machine Backfill BCOS
BC3 Prospect Shaft Machine Backfill BCOS
BC4 Prospect Shaft Machine Backfill BCOS
BC5 Shaft Machine Backfill BCOS
BC6 Stope Machine Backfill BCOS
BC7 Stope Machine Backfill BCOS
BC8 Stope Machine Backfill BCOS
BC9 Stope Machine Backfill BCOS
BC10 Stope Machine Backfill BCOS
BC11 Adit Grated CSP w/ Bat Ladder BCOS
BC13 Shaft Machine Backfill BCOS
KR02 Shaft Machine Backfill Private
KR03 Shaft Machine Backfill USFS
Am#1 Revised (5/19/2026) Bid Schedule Twin Sisters Mine Closure Project
DQ1 PKAA 2026*0289
Item 4.0 - Safeguard Hazardous Mine Openings:
Am#1 Revised (5/19/2026) Bid Schedule Twin Sisters Mine Closure Project
DQ1 PKAA 2026*0289
Item 4.0 - Safeguard Hazardous Mine Openings:
LB01 Adit Bulkhead w/ CSP Bat Ladder Private
M01 Adit Modified Machine Backfill Private
M02 Shaft Machine Backfill Private
M03 Shaft Machine Backfill Private
M04 Shaft Machine Backfill Private
SH01 Shaft/Incline Machine Backfill Private
Total (enter here and on Bid Schedule, Item 4.0):
Do not amend any part of this bid schedule all pages of this bid schedule must be returned all line items must be completed.
156-M-2 Adit Replace Cap, Machine Backfill area above CSP USFS
211-MM-3-M Stope Machine Backfill subsiding area BCOS
Am#1 Revised (5/19/2026) Bid Schedule Twin Sisters Mine Closure Project
DQ1 PKAA 2026*0289
Item 5.0 - Maintenance Features:
Total (enter here and on Bid Schedule, Item 5.0):
Do not amend any part of this bid schedule all pages of this bid schedule must be returned all line items must be completed.
FS2 Shaft Machine Backfill Private
Am#1 Revised (5/19/2026) Bid Schedule Twin Sisters Mine Closure Project
DQ1 PKAA 2026*0289
Item 6.0 - Safeguard Additional Hazardous Mine Openings (NOT GUARANTEED):
Total (enter here and on Bid Schedule, Item 6.0):
Do not amend any part of this bid schedule all pages of this bid schedule must be returned all line items must be completed.
File details come from the government source that posted it. Updated .