Port Angeles Landfill Stabilization
The Port Angeles Landfill operations and waste containment cells were closed in 2007 and contained with a seawall; however, bluff erosion east of the seawall caused the eastern half of the cover system to fail and expose waste, risking impacts to human health and the environment requiring urgent action. Herrera led a team to complete design on long-term landfill waste relocation and new cell development and seawall end protection compatible with managed bluff retreat and extensive existing site infrastructure. In addition, stream stabilization and shoreline access improvements were designed to support the larger project. This project includes the tallest Mechanical Reinforced Earth wall in Washington and the first application of an artificial turf landfill cover system with side slopes steeper than standard landfill closures, reducing the project cost by $1M.