Wastewater Treatment & Control

Owner/Client: City and County of San Francisco

Construction Cost: $1.5 billion

Description: The San Francisco Clean Water Program Master Plan was undertaken in 1974 to outline a massive upgrade of the wastewater collection, treatment and disposal system to protect water quality in San Francisco Bay and the Pacific Ocean and to comply with the Federal Clean Water Act. The system consists of a combined dry weather and wet weather sewer system, three water pollution control plants and effluent outfalls into the ocean. DTA was retained in 1977 to provide construction management including planning and master scheduling for all projects. Over the next 25 years we developed and maintained detailed design and construction schedules; resource information; cost control data; and construction management plans for each project as well as constructability analysis and field engineering.

Owner/Client: New York City Department of Environmental Protection

Construction Cost: $1 billion

Description: The City of New York constructed a new 200 mgd water pollution control plant on piles and floating concrete platform in the Hudson River to provide primary and secondary wastewater treatment. The roof of the plant was landscaped into a 32-acre state park. DTA provided design review services, developed a preconstruction schedule and provided schedule oversight and monitoring during construction and assisted with expert witness testimony.

Owner/Client: City and County of San Francisco

Construction Cost: $42.5 million

Description: The Islais Creek sewage transport and wet weather facilities projects involve separate construction of large concrete cut and cover storage box facilities, transport and pipeline to deliver wet weather flow to the Southeast Water Pollution Control Plant via Bruce Flynn Pump Station. DTA provided construction management services including scheduling services, constructability review, change order review and claims analysis on Contracts B & D.

Owner/Client: Massachusetts Water Resources Authority (MWRA) / Kaiser Engineers

Construction Cost: $3.8 billion

Description: This extraordinarily complex and massive engineering project to clean up Boston Harbor involved construction of two sewage treatment plants on Deer Island to treat half a billion gallons of sewage daily. DTA conducted a market study to determine availability, multiple sources, future costs of bulk materials. We identified optimal means of transporting materials to an onshore staging area and investigated feasibility of long term contracts to guarantee supply and reduce price variation. DTA participated in a value engineering program providing analyses for a number of designs at the 60% conceptual and final design phases. The initial value engineering study resulted in $1 million worth of recommended savings.