Media Filter Rehabilitation for WTP Filters #1 & #2

The City of Benicia’s Water Treatment Plant is soliciting proposals from qualified contractors to rehabilitate two water treatment filters. The current project includes:

• Complete replacement of filter media — GAC, sand, and gravel — meeting applicable AWWA standards.
• Smoothing and recoating of the interior walls of the two filters.
• Inspection and, if necessary, repair of the filter underdrain system.
• The current RFP and resulting agreement will cover only two filters.

The remaining four filters (#3–#6) are anticipated to be rehabilitated sequentially over the next four years, approximately every two years. Each future project will require a separate RFP process.

In short: This RFP is for the complete rehabilitation of two filters now, with the remaining four filters planned for future rehabilitation.

The Water Treatment Plant has six GAC media filters. To replace the oldest filters, maintain AWWA compliance, and improve overall system reliability, the City plans to complete full media replacement and interior wall coating on two filters. These improvements are intended to enhance water quality, extend filter service life, and reduce ongoing maintenance workloads.