IFB 5744A - Griswold WPF Raw Water Structure Improvements - Phase 2

Modify the Bypass Vault and Raw Water Mix Facility constructing a single new, larger structure with above-grade access via a stairwell to eliminate confined space entry and improve safety, access, and ease of operation and maintenance. The structure will enclose the 42-inch Kuiper / Quincy line, and the check valve currently located in the Bypass Vault. Replace the Rampart ball valve with a sleeve valve in the Raw Water Mix Facility and upsize the recycle pipeline to handle flow. Evaluate concurrent valve operation to cover a flow range between o and 80 MGD.