Unit 4 cell 5 liner construction twin chimneys landfill

Greenville County, South Carolina is requesting proposals for Unit 4 Cell 5 Liner Construction at Twin Chimneys Landfill, an 8.6-acre municipal solid waste cell liner system, with proposals due August 21, 2026 at 3:00 p.m. and a non-mandatory pre-proposal meeting on August 5, 2026.

The scope encompasses construction of a base liner system with 24 inches of on-site compacted clay (1x10-5 cm/sec permeability), geosynthetic clay liner, 60-mil HDPE geomembrane, geocomposite drainage material, leachate collection piping (5-inch to 22-inch diameters), 24 inches of off-site protective cover soil, and site seeding on 10 acres. Greenville County will procure the GCL, 60-mil HDPE, and geocomposite separately; the contractor furnishes all remaining materials and is responsible for construction quality control and surveying. The contractor must obtain on-site clay material and source off-site protective cover soil and stone from borrow pits, maintaining accessibility throughout the schedule. Quantities include approximately 28,000 cubic yards of compacted soil liner, 1,910 cubic yards of leachate column stone, 6,000 square yards of separator geotextile, and 28,000 cubic yards of operational cover. The contractor must be licensed to perform construction work in South Carolina and comply with the South Carolina Illegal Immigration Reform Act and Prison Rape Elimination Act.

The County requires Substantial Completion within 180 calendar days from Notice to Proceed and Final Completion within 210 calendar days, with liquidated damages of $1,000 per day for Substantial Completion delays and $500 per day for Final Completion delays. A fuel price adjustment clause applies to subgrade preparation, compacted soil liner, leachate column stone, and operational cover, calculated using SCDOT monthly fuel price indices with triggers at 1.10 (upward) and 0.90 (downward) ratios.

A 5 percent bid bond and performance and payment bond equal to the total bid price (due within fifteen working days of award) are required. Insurance requirements include $1,000,000 per occurrence general liability, $1,000,000 per occurrence automobile liability, and statutory workers' compensation. The County retains 10 percent from all monthly invoices, released upon satisfactory completion.

Evaluation criteria—each weighted equally at 16.7 percent—cover responsiveness, experience with similar projects within five years, current workload and available resources, references, proposed schedule, and cost competitiveness. Questions are due August 10, 2026 at 5:00 p.m. Award is anticipated September 4, 2026, with contract negotiations September 4–18 and Notice to Proceed expected September 18, 2026.