Construction of Twin Chimneys Landfill Unit 4 Cell 5 Liner

Greenville County, South Carolina is requesting proposals for construction of an 8.6-acre base liner system at Twin Chimneys Landfill Unit 4 Cell 5, with proposals due August 21, 2026, and a non-mandatory pre-proposal meeting on August 5, 2026 at the site in Honea Path.

The liner system comprises 24 inches of on-site clay (1×10⁻⁵ cm/sec permeability), geosynthetic clay liner, 60-mil high-density polyethylene, geocomposite material, 24 inches of off-site protective cover, and leachate collection pipes. The contractor is responsible for construction quality control and surveying; Greenville County will provide separate Construction Quality Assurance through a distinct procurement. The contractor must furnish all materials except geosynthetic components (GCL, HDPE, and geocomposite), which the County will purchase separately. On-site clay and off-site protective cover soil and stone for pipe bedding and backfill must be obtained by the contractor. South Carolina construction licensure is required, and the contractor must comply with the South Carolina Illegal Immigration Reform Act and the Prison Rape Elimination Act.

Substantial Completion is due within 180 calendar days from Notice to Proceed, with Final Completion within 210 calendar days; liquidated damages are assessed at $1,000 per day for Substantial Completion delays and $500 per day for Final Completion delays. Pricing must be submitted as a lump-sum fixed price on 30-day payment terms, with a bid bond equal to 5% of bid price due at submission. A performance and payment bond equal to the total bid price is required within 15 working days of award. Insurance requirements include Comprehensive General Liability of $1 million per occurrence / $2 million aggregate, Automobile Liability of $1 million per occurrence, and Statutory Worker's Compensation with $1 million coverage limits, with the County named as additional insured (except on Workers' Compensation, Automobile Liability, and Professional Errors and Omissions).

Evaluation criteria are equally weighted at 16.7% each: Responsiveness to RFP, Experience with Similar Projects, Current Workload, References, Proposed Project Schedule, and Cost. Questions are due August 10, 2026 at 5:00 pm. Award is tentatively scheduled for September 4, 2026, with contract negotiations September 4–18 and Notice to Proceed anticipated September 18, 2026.