Design and Construction Services for Improvements to Pipeline Supplying Spot Pond Pumping Station
Weston & Sampson was selected by the Massachusetts Water Resources Authority (MWRA) to evaluate, design, and provide construction services for improvements to the pipelines that supply the Spot Pond pumping station. This project includes approximately 13,650 feet of new 60-inch and 72-inch diameter prestressed concrete pressure pipeline, which will serve as a suction main for the rehabilitated Spot Pond pumping station.
Planning and design services included the comprehensive evaluation of alternative pipeline routes, alternative pipeline materials, aerial and ground surveys, traffic planning, assessment of potential hazardous wastes, and environmental and archeaological assessments for the selected alternative. Selection of the prestressed concrete pipe provided the MWRA with a long-term solution for reliability and economy.
Weston & Sampson closely coordinated the project through the planning and design phase with the communities of Malden, Medford, Melrose, and Stoneham, Massachusetts, and with the Metropolitan District Commission (MDC) (now the Department of Conservation and Recreation), the Massachusetts Historical Commission (MHC), and the Executive Office of Environmental Affairs (EOEA). Mitigation measures for construction impacts were developed by Weston & Sampson and accepted by the communities and regulatory agencies, resulting in no Environmental Impact Report.
Our comprehensive investigation of existing site conditions and route planning minimized utility relocations for sewers, water mains, storm drains, gas mains, telephone vaults, and electric lines, especially in Malden where congested, urban streets required coordination with many utility owners. More than 80 percent of the pipeline route is within MDC roadways, parkways, and parkland requiring close coordination with MDC engineering and recreation staff. Roadway work included full-depth road reconstruction, American with Disabilities Act (ADA) handicap access ramps, and the design of a bike path.
Weston & Sampson provided construction administration services throughout the construction phase and assisted MWRA resident engineering field staff. The quality and completeness of the construction documents prepared by Weston & Sampson resulted in minimal change orders.