Lift Station No. 1 & WPCF Chlorine Contact Channel Isolation Valve Replacement, Everett, WA

Contractor to construct and/or install the following, including but not limited to: Project A: 1. Temporary erosion and sediment control measures. 2. Trenching, excavation, shoring, dewatering, bedding, backfill, and compaction for installation of a new plug valve, precast vault, and line stop fitting along an existing 30-inch ductile iron force main. 3. Bypass pumping from backup LS 1B to the LS 1 wet well to facilitate installation of the line stop, new 30-inch valve, and associated appurtenances. 4. Installing a line stop fitting, including pouring and curing a concrete block under the existing pipe to support the line stopping equipment, to execute a line stop and removing the line stop equipment and sealing the line stop fitting when the valve installation is complete. 5. Removing a portion of the existing 30-inch ductile iron force main to facilitate installation of the new plug valve. 6. Installing the new 30-inch plug valve, connecting piping, and associated appurtenances. 7. Installing a precast vault for the new 30-inch plug valve with cast-in-place footings. 8. Surface restoration. Project B: 1. Temporary erosion and sediment control measures. 2. Removing and reinstalling the existing chlorine contact channel isolation valve vault cover to facilitate replacement of an existing 48-inch butterfly valve. 3. Cutting the flange off the existing 48-inch concrete cylinder pipe in the vault to facilitate installation of the new valve. 4. Demolishing and removing the existing isolation butterfly valve, stem, and operator pedestal at the chlorine contact channel isolation valve vault. 5. Installing a new 48-inch butterfly valve, flange coupling adapter, and pipe support in the existing chlorine contact channel isolation valve vault.