Brookline and Boston, Massachussets United States
Drinking Water and Wastewater
Massachusetts Water Resources Authority
$2,500,001 - $10,000,000
This project involved the design and construction of more than two miles of water transmission main. The existing steel pipeline was constructed in 1927-1928 and serves as a major water transmission main for the Massachusetts Water Resource Authority (MWRA). Approximately 800 feet of the original pipeline was replaced in 1997 due to excessive leaks and corrosion. The remaining 11,500 feet of original pipe was rehabilitated during this project utilizing innovative trenchless technologies.
Triple Bottom Line
Economic: By performing extensive engineering investigations of the pipeline, we were able to accurately assess the condition of the pipeline for rehabilitation. As a result of the extensive field work and engineering analysis, we determined that the life span of certain segments of the pipeline could be extended for at least another 50 years by cleaning and lining, rather than structural rehabilitation or replacement. In other areas where the pipe required replacement due to corrosion issues, we were able to use trenchless technologies. Without performing the extensive field investigations and engineering analysis to determine the condition of the existing pipe and its potential for rehabilitation, the design approach would have been to replace the pipe along the entire alignment using open-cut trench excavation, which would have potentially doubled the cost of the project and would have generated significantly more waste material, environmental impact and disturbance to the surrounding area.
Environmental: By using trenchless technologies to rehabilitate the pipeline instead of performing conventional open-cut trench excavation, we were able to avoid disturbing a large wetland resource area, root systems of numerous mature shade trees, residential properties, traffic, school zones, and a major intersection along State Route 9.
Social: A significant portion of the pipeline is located in cross-country easements that run through private properties in affluent residential neighborhoods of Boston and Brookline, as well as through a college campus. The MWRA and the design team held a number of public informational/neighborhood meetings in order to explain the need for the project, the alternatives that were evaluated, and how the preferred alternative was the most cost- effective, environmentally sensitive and least disruptive option. The neighborhood meetings paid huge dividends during construction as there were virtually no complaints from residents (or subsequent delays).
Peter Richardson, Vice President
Green International Affiliates