Pasco Landfill National Priorities List (NPL) Site
Client: Industrial Waste Area Generators (IWAG) Group
Overview of Floyd|Snider Contributions
Project Summary
The Pasco Landfill NPL Site is located within the city of Pasco, in Eastern Washington. The landfill property covers nearly 200 acres and is surrounded by agriculture and commercial businesses.
Interim actions included installation of systems to treat contaminated soil vapors, landfill gas, and groundwater. Between 2020 and 2022, the remedial action of removing 35,000 drums of waste liquids and sludges from the industrial waste area referred to as Zone A was completed. In 2024, in situ thermal treatment of the contaminated soils remaining in Zone A started and is in progress.
The Pasco Landfill NPL Site is located within the city of Pasco, in Eastern Washington. The landfill property covers nearly 200 acres and is surrounded by agriculture and commercial businesses. The landfill opened in 1958, and waste was burned in trenches until 1971, when the site became a sanitary landfill. From 1972 to 1975, the landfill accepted industrial waste. The industrial waste area zones at the Pasco Landfill NPL Site are considered one of Washington’s most challenging cleanup sites due to the large amount of industrial waste that was disposed of at the site across multiple areas. Cleanup actions began in the early 2000s on the industrial waste zones and municipal solid waste landfill.
Interim actions included installation of systems to treat contaminated soil vapors, landfill gas, and groundwater. Between 2020 and 2022, the remedial action of removing 35,000 drums of waste liquids and sludges from the industrial waste area referred to as Zone A was completed. In 2024, in situ thermal treatment of the contaminated soils remaining in Zone A started and is in progress.
Our Approach
Floyd|Snider joined the project to support the IWAG group as the lead common consultant and project coordinator in late 2018 and assisted the group with the successful negotiation of a mutually successful final remedial action scope for the Site.
Floyd|Snider joined the project to support the IWAG group as the lead common consultant and project coordinator in late 2018 and assisted the group with the successful negotiation of a mutually successful final remedial action scope for the Site. Floyd|Snider has worked collaboratively with Ecology and stakeholders to develop regulatory and technical approaches for the project, including the development of monitoring plans, Engineering Design Reports (EDRs), and construction completion reports. Floyd|Snider has led the development of the EDR for the drum removal action, working in close coordination with ENTACT as the implementing contractor and PBS (now Apex) and served as the owner’s representative during construction. This action included leading stakeholder engagement and construction planning with local emergency planning officials, adjacent business owners, Franklin County, and the City of Pasco. Floyd|Snider also led the development of the EDR for the final remedial cover of the Balefill Waste Area and oversees the approach and operations of landfill gas collection and destruction of the municipal solid waste landfill. Floyd|Snider is currently supporting the IWAG group and a thermal vendor with the in situ treatment of the contaminated soils remaining after the drum removal action. Floyd|Snider also provides budget planning, financial forecasting, and trust management services to the IWAG group.