GAC treatment system retrofit and PFAS pilot study
UOSA IFB 27-01 GAC Treatment Optimization, Solicitation IV127897, issued by Upper Occoquan Service Authority.
At a glance
The Utilities and Sanitary Authority seeks contractors to retrofit a carbon contactor system for PFAS treatment pilot testing in Centreville, VA. Phase 1 involves modifying one building's two-cell system, restoring flow capabilities, and evaluating carbon transfer improvements; Phase 2 may expand improvements to seven additional contactors pending Phase 1 results.
Key facts
- Issuing agency
- Upper Occoquan Service Authority
- Solicitation number
- IV127897
- Type
- Invitation for Bids (IFB)
- Posted
- Sep 15, 2026
- Response deadline
- Oct 6, 2026, 2:00 PM EDT
- Place of performance
- 14631 Compton Rd., Centreville, VA 20121
Official description
Phase 1 of the GAC Treatment Optimization Project includes, but is not limited to, retrofitting one L/2 Building carbon contactor, consisting of two cells, to serve as the per- and polyfluoroalkyl substances (PFAS) pilot study system; restoring upflow and downflow operating capability through modifications to the existing underdrain nozzle system; and implementing a proof-of-concept evaluation for carbon transfer improvements. If authorized by the Owner, Phase 2 of the Project will include, but is not limited to, retrofitting the remaining seven carbon contactors (i.e., fourteen cells) with the selected improvements based on the results of Phase 1. A complete description of the Work can be found in the Contract Documents.
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