UOSA IFB 27-01 GAC Treatment Optimization

Phase 1 of the GAC Treatment Optimization Project involves retrofitting a single L/2 Building carbon contactor (two cells) to serve as a PFAS pilot‑study system, restoring up‑flow and down‑flow capability by modifying the existing under‑drain nozzle system, and conducting a proof‑of‑concept evaluation for carbon transfer improvements. If the owner authorizes Phase 2, the remaining seven carbon contactors (fourteen cells) will be retrofitted with the selected improvements based on Phase 1 results. The work is located at 14631 Compton Rd., Centreville, VA, and detailed specifications are included in the contract documents. • Retrofit one carbon contactor for PFAS pilot study • Restore and modify up‑flow/down‑flow nozzle system • Conduct proof‑of‑concept evaluation for carbon transfer • Potential Phase 2 to retrofit additional seven contactors • All work performed on site at Upper Occoquan Service Authority’s treatment facility.