BC_LP_Uravan_NRD_Feature_Worklist DQ1 PKAA 2026-0430.pdf

This is a Feature Work List for the PKAA Bobcat LaPorte Uravan NRD (Natural Resource Damage) Project in Colorado, detailing mine opening closure remediation work. The project encompasses the sealing and backfilling of subsidence features associated with abandoned mine workings in the Uravan area. Two primary subsidence features are identified for remediation: Feature 2959 Subs 1, a 3-foot by 3-foot excavated opening with a 20-foot by 20-foot eroded area and 10-foot depth requiring 9 cubic yards of polyurethane foam (PUF) sealant and backfill work; and Feature 2959 Subs 2, a 15-foot by 9-foot subsidence feature with 4-foot depth requiring 18 cubic yards of PUF sealant. Both features are located near the EE22 road and require closure using Standard Work Specifications (SWS) 2 and SWS 9 methodologies to seal mine openings with PUF and backfill surrounding areas with adjacent waste rock to establish positive drainage away from the openings.

The work specifications indicate that both subsidence features are lined with rock and have no existing drainage systems. Contractors must place back forms to properly plug the subsidence features and create engineered drainage solutions to prevent future water infiltration and subsidence progression. The document provides specific UTM coordinates (NAD83 datum) for precise site location and includes detailed descriptions of excavation dimensions, current feature sizes, and depth measurements to guide bid preparation and work execution. No specific pricing, contract term, award dates, or bidding deadlines are referenced in this feature work list document.