Antea Group was contracted by the owner/operator of a 400-mile interstate pipeline system to manage legacy environmental liabilities, and provide ongoing environmental support for active pipeline operations. The pipeline runs along a 299-mile corridor from Washington to Oregon, transporting 1.3 billion gallons of refined petroleum products annually to terminals located at Seattle's Harbor Island, Seattle-Tacoma International Airport, and Portland Oregon. The legacy liabilities are located along the pipeline right-of-way, and at operating pipeline delivery, distribution and bulk storage facilities.
Antea Group initially reviewed all environmental documents associated with the legacy environmental liabilities, and in collaboration with the client developed a portfolio-wide criteria for categorizing the existing liabilities. The categorization emphasized focusing resources on liabilities with achievable remedial endpoints in the near-term while maintaining an acceptable level of risk at sites with long-term liabilities or ongoing operations.
As part of the solution development process, Antea Group engaged the regulatory agency to vet the agency’s appetite for implementing innovative methods for site closure within the Model Toxic Cleanup regulatory framework. To support the day-to-day pipeline operations, Antea Group created a small team of environmental scientists, engineers and geologists solely dedicated to supporting pipeline operations and pipeline capital improvement projects. The team worked closely with pipeline operations and planning to coordinate environmental support for large-scale capital improvement projects, and environmental risk management.
The solution resulted in regulatory closures at three sites within four years of initiating the contract. These liabilities had existed for over 20 years. The liability life-cycle cost reduction permitted the client to invest additional resources in operations or focus resources on long-term liabilities where site closure offered a strategic advantage to the client.