About this Project:
The Northern Extra High (NEH) Pressure Zone provides water to Arlington, Bedford (through Lexington), Belmont, Lexington, Waltham and Winchester. The six communities are supplied an average of 11.55 million gallons per day (mgd) from MWRA through twelve community meters. Water is pumped to these communities and into storage facilities in Arlington, Lexington and Waltham by three pumping stations:Spring Street Pumping Station, Brattle Court Pumping Station, and Lexington Street Pumping Station. The pumping stations draw water from the Norumbega Covered Storage Facility via the Weston Aqueduct Supply Main 3 (WASM 3).
The NEH Pressure Zone Improvements Project involves installation of up to 23,100 linear feet of new 24-inch water main, replacement of approximately 8,400 linear feet of existing water main, rehabilitation or replacement of approximately 4,800 linear feet of existing water main,installation of two new community meters, and rehabilitation or replacement of existing community meters. The project is necessary to improve redundancy in the NEH pressure zone by the rehabilitation or replacement of again infrastructure. The majority of the improvements are located in Lexington and Arlington.
Scope:
The first construction package includes the installation of approximately 5,300 linear feet of new 24-inch water main to extend Section 63 in Lexington, as the first leg of the redundant loop, which will also allow Burlington Phase 2 pipeline to connect to the MWRA system. The new MWRA pipeline is scheduled to completed by the time Burlington’s Phase 2 project is complete.
The second construction package will include installation of up to 11,100 linear feet of new 24-inch water main in Lexington to interconnect Section 45 to the new pipeline installed in CP1 to improve redundancy. CP2 will also include installation of a new meter for Lexington and replacement of 3,400 linear feet of 20-inch pipe in Section 63 in Arlington with 24-inch piping.
The third construction package will include installation of up to 6,700 linear feet of new 24-inch water main in Lexington to interconnect Section 83 to Section 45 and the new pipeline installed in CP2 to improve redundancy. CP3 will also include increasing the capacity of approximately 5,000 linear feet of Section 34 and 45 in Arlington with 20-inch pipe, rehabilitation or replacement of approximately 4,800 linear feet of 24-inch Section 61 in Arlington, installation of one new meter for Belmont, and rehabilitation and replacement of existing community water meters for Arlington, Lexington, Belmont, Waltham and Winchester.
Schedule:
The expected completion date will be in 2027. The construction will take approximately 94 months (seven years and ten months).
