About this Project:
This project will improve the hydraulic capacity and reliability of the Northern High pressure zone by upgrading and or installing new pipelines interconnected to Section 53 and 99. Section 53 is a 48-inch diameter, steel pipeline that was constructed in 1993. It is aligned in an east-west direction along Route 60 in Malden and serves the Northern High System. It normally receives water from the City Tunnel Extension at Shaft 9A and carries it through Malden towards Revere before connecting with Sections 68, 72 and 91, which then carry the water to Saugus, Peabody, Wakefield, Lynnfield, Nahant, Swampscott and Marblehead. During emergencies and during the course of normal system repairs, Section 53 also acts to supplement the southeastern portions of the Northern High system (Sections 14, 15, 49 and 84) that ordinarily delivers water to Everett, Chelsea, parts of Malden and Revere and also to Winthrop and Deer Island.
At its western end, Section 53 is interconnected with the Shaft 9A surface pipelines through a 30-inch diameter pipeline (approximately 4,000 linear feet of Section 14) and a 24-inch diameter pipeline (approximately 3,500 linear feet of Section 49 and 49A). The eastern end of Section 53 interconnects with Sections 72 and 91 through a single 30-inch diameter. The smaller diameter connections at either end of Section 53 act as hydraulic restrictions in the system and effectively reduce the capacity of Section 53. This project will improve the condition, hydraulic capacity, and reliability of these interconnecting pipelines. This $4.9 million contract was awarded to Hazen and Sawyer, P.C., for contract term of 102 months from the Notice to Proceed.
This project will include the development of design documents for two construction contracts as follows:
- The new construction of approximately 5,400 linear feet of Section 14, and 1,000 linear feet of Section 68 with new 48-inch diameter pipelines;
- The rehabilitation (cleaning and cement mortar lining) of approximately 5,400 linear feet of Section 14; and 2,600 linear feet of Sections 49 and 49A.
The construction is estimate to take 54 months.