In 2008, the Department of Ecology (Ecology) and the City of Bothell (City) negotiated three legal agreements called Agreed Orders to perform site investigations on three contaminated City-owned properties (Landing, Riverside and Paint & Decorating sites) in downtown Bothell. These sites, which lie in the pathway of the new Crossroads roadway alignment, will be cleaned up in accordance with the Model Toxics Control Act (MTCA), prior to the planned roadway construction and site redevelopment.
Scope of Work
The scope of work in the Agreed Orders includes completing Remedial Investigations (RI), developing Feasibility Studies (FS), and preparing Draft Cleanup Action Plans (DCAP). Under the Agreed Orders, the City will receive Remedial Action Grant (RAG) funding to complete the work. With $520,000 in secured RAG funds administered under Ecology’s Toxics Cleanup Program, Ecology will pay for 50% of eligible costs incurred by the City up to $520,000. It is anticipated that an additional $3M in RAG funds will be secured by the City to complete the environmental remediation work.
In June 2010, Ecology and the City collaboratively executed amendments to the Agreed Orders to include Interim Actions. Under WAC 173-340-430, an interim action is a remedial action that is technically necessary to reduce a threat to human health or the environment by eliminating or substantially reducing one or more pathways for exposure to a hazardous substance, that corrects a problem that may become substantially worse or cost substantially more to address if the remedial action is delayed, or that is needed to provide for completion of a site hazard assessment, remedial investigation/feasibility study or design of a cleanup action. An interim action is a partial cleanup that could eventually qualify as a final cleanup under MTCA.
Phase 2 Constructions
The sites will be cleaned up during Crossroads Phase 2 construction in August 2010. Cleanup will consist of excavating contaminated soils and transporting them for disposal at a licensed facility that handles hazardous materials. The excavations will be then be treated with slurry to remediate the remnant soils and groundwater, followed by backfill with clean material. Groundwater at the sites will be then monitored quarterly, by sampling newly installed monitoring wells for a one year period following the cleanup.