When toxic material remains at a site, we review site conditions about every five years to ensure the cleanup is still protecting human health and the environment.
We invite you to review and comment on the Draft Third Periodic Review Report.
The periodic review report shows that cleanup work remains effective in protecting human health and the environment. We may modify the draft report if new information is submitted during the comment period.
The Centralia Landfill is a city solid waste landfill that operated from 1958 to 1994. In 1994, a multi-layered cover was installed on the buried waste. The cover prevents stormwater from seeping into the buried material. The cover also directs clean surface water runoff into a wetland area south of the landfill.
A permanent gas collection system was installed to collect and destroy methane that can be generated by decomposition of municpal waste. Groundwater wells were installed around the covered landfill area to monitor metal concentrations and other water quality conditions. Surface water quality has been monitored regularly from a ditch immediatly before the water moves off the site.
An environmental covenant was filed for the site in 2001 because hazardous material remains at the site.
The owner is required to continue monitoring groundwater, surface water, and landfill gas as described in the updated 2020 monitoring plan.
The remedy at the Central Landfill is considered protective of human health and the environment because the solid waste is contained, landfill gas is collected and destroyed, groundwater is monitored, and surface water is protected.
Among other things, the environmental covenant requires maintaining the integrity of the cap covering buried waste and the fencing to restrict public access. The covenant prohibits activities that may result in release of contaminants contained as part of the cleanup without Ecology's approval, restricts groundwater for any use other than for compliance monitoring, and any use of the property that is not consistent with the covenant.