About this Project:
MWRA’s Weston Aqueduct Supply Main 3 consists of approximately 10 miles of steel pipe installed in the 1920s and 30s. The pipe is a critical supply to over 250,000 customers in the Northern High, Northern Extra High and Intermediate High supply systems serving Waltham, Watertown, Belmont, Lexington, Bedford, Arlington, Somerville and Medford. It also can provide emergency supply to the Gillis Pump Station serving communities of the North Shore and Northern Intermediate High communities. Figure 1 shows the full extent of the WASM 3 pipeline and the work limits for the current construction contract.
This first construction contract includes rehabilitation of approximately 13,800 feet of 56-inch and 60-inch diameter water main starting in Medford in December 2020, and continuing in Somerville and Arlington from Fall of 2021 to Spring of 2024. The rehabilitation will consist of cleaning and internal cement mortar lining of the pipe and adding valves for better operational flexibility. Figure 2 shows the segments to be completed under this contract.
The work is restricted to low water demand months from September 15 to May 15, which necessitates three construction phases during the duration of the contract. This work restriction is necessary to ensure the main is operational during high summer demand periods. MWRA has awarded this $19.5 million contract to Albanese D&S, Inc. with a contract term of 912 calendar days from the Notice to Proceed.