AML 2651 Calcaterra Pit Subsidence

The Illinois Department of Natural Resources, Office of Mines and Minerals, Division of Abandoned Mined Lands is requesting bids for subsidence remediation at the Calcaterra Pit site in Energy, Illinois, with bids due August 11, 2026. The project addresses a collapsed underground coal mine causing pit subsidence at 409 Bhrett Drive.

The scope requires excavation of approximately 580 cubic yards of loose soil and debris to 18 feet below ground surface, installation of 165 cubic yards of Modified Cement CLSM flowable fill with 48-hour cure, placement of a 6-inch bentonite layer over a 4-foot-wide perimeter, backfill completion using previously excavated material in 2-foot lifts with mechanical tamping, supply and installation of 125 cubic yards of furnished clay soil, and seeding and restoration of up to 0.5 acre. Work must commence within seven calendar days of bid award, with all construction activities completed within 15 days of startup and final cleanup, inspection, and reseeding completed by September 30, 2026. The contractor must obtain a JULIE utility locate prior to beginning work and comply with the Illinois Department of Transportation Standard Specifications for Road and Bridge Construction (January 2022) as amended by Supplemental Specifications (January 2026).

Insurance requirements include workers compensation, commercial general liability of $2 million general aggregate and $1 million per occurrence, commercial auto liability of $1 million, and umbrella liability coverage. The contractor is responsible for securing all necessary permits and becoming a party to the Department's Storm Water Pollution Prevention Plan. Prevailing wage requirements apply. Liquidated damages apply for delays beyond the 15-day completion window. Payment is contingent upon appropriated State funds. Vendors must comply with 34 Standard Illinois Certifications requirements covering educational loan defaults, tax obligations, drug-free workplace standards, equal employment opportunity, cybersecurity compliance, ethics, and prohibitions on forced-labor and child-labor materials.