SoundEarth managed the remediation of a heating oil tank release at a residential home on the shoreline of Lake Washington and adjacent to a home with a steep (>40 percent) slope. The site was within the shoreline buffer zone and designated as a critical land use area. Prior to excavating, SoundEarth evaluated previous site investigation reports, conducted subsurface investigations, developed a site conceptual model, and evaluated the most feasible cleanup alternatives, all of which were summarized in a remedial investigation/feasibility study and cleanup action plan in accordance with the Model Toxics Control Act. Gaining the Washington State Department of Ecology’s concurrence on the remedial alternative was critical to facilitating the permitting process with the City of Bellevue, which involved a State Environmental Policy Act review, habitat assessment and restoration, and development within critical land use and shoreline buffer zone areas-all in addition to the conventional clearing and grading permit, building permit, and utility and right-of-way permits. The shoring of the residential home required special inspection reports, weekly survey monitoring, and continual correspondence with City building officials and permit inspectors.

The site was within the shoreline buffer zone and designated as a critical land use area. Prior to excavating, SoundEarth evaluated previous site investigation reports, conducted subsurface investigations, developed a site conceptual model, and evaluated the most feasible cleanup alternatives, all of which were summarized in a remedial investigation/feasibility study and cleanup action plan in accordance with the Model Toxics Control Act. Gaining the Washington State Department of Ecology’s concurrence on the remedial alternative was critical to facilitating the permitting process with the City of Bellevue, which involved a State Environmental Policy Act review, habitat assessment and restoration, and development within critical land use and shoreline buffer zone areas-all in addition to the conventional clearing and grading permit, building permit, and utility and right-of-way permits. The shoring of the residential home required special inspection reports, weekly survey monitoring, and continual correspondence with City building officials and permit inspectors.

SoundEarth managed and interacted with City permit inspectors, Ecology, multiple stakeholders, and insurance company representatives. We successfully oversaw the removal of 1,300 tons of contaminated soil and replacement and revegetation of the hillside. SoundEarth will perform a year of groundwater monitoring to confirm the remedy and anticipates receiving a determination of No Further Action from Ecology.