What Our Clients Are Saying
Overall one of the better EMPs ever submitted to the Departments Solid Waste Section, thank you for putting this together.
Robert S. Barrows, Jr., Manager
Western Region Solid Waste Program
UST: Retail Boating Facility
Client
Project Type
Project Services
Project Description
The project site is located on the Willamette River. A release of gasoline occurred as a result of a failure in the product piping associated with a former 10,000-gallon underground storage tank (UST) system at the site. Following characterization of the contaminant plumes, a remediation system was installed to extract groundwater containing elevated concentrations of petroleum hydrocarbon constituents including free liquid product. Treatment was performed by passing extracted fluids through a coalescing plate oil-water separator, a tray-aeration air stripper, and three (3) carbon canisters. The treated groundwater was discharged into the adjacent Willamette River under the Oregon Department of Environmental Quality (DEQ) National Pollutant Discharge Elimination System (NPDES) 1500A Permit.
Remediation efforts were expanded to the shoreline of the Willamette River after consultation with the DEQ, Oregon Division of State Lands, US Army Corps of Engineers, and the City of Portland. Expanded remedial efforts included installation of a dual-phase extraction (DPE) system replacing the submersible pumps previously installed in recovery wells RW-1 and RW-2 and installation of an air-sparging system including installation of 19 air-sparging wells in the beach area adjacent to the Willamette River.
Groundwater monitoring data indicated that operation of the in-situ remediation system resulted in achievement of target cleanup standards. Following a period of compliance groundwater monitoring, the site was issued a “no further action” (NFA) determination by the DEQ.
