Dow Road Site Dallesport Industrial Park

The site is located at the Dallesport Industrial Park. In 2007, Ecology performed an initial investigation and soil sampling at the site. Sample results confirmed that contaminants found at the Dow Road Site consisted of the same salt-cake material found at the nearby Recycled Aluminum Metals Co (RAMCO) site.

The cleanup action selected for the site was excavation and removal of contaminated soils to a landfill. The criteria for this cleanup action were adopted directly from the Interim Remedial Action Plan developed by Ecology for the related RAMCO site. The Dow Road cleanup was performed by the same contractor hired by Ecology to conduct the RAMCO interim action. The contractor used the same methods and equipment, and disposal of the contaminated soil was at the same landfill utilized for the RAMCO cleanup.

During excavation, the extent of contamination was determined by visual means. Soil having a white to grey coloration, very distinctive from the native soil, was excavated and hauled to the Wasco County Landfill. Confirmatory sampling indicated that contaminants of concern were removed to below the applicable Model Toxics Control Act (MTCA) Method A or Method B soil cleanup levels for unrestricted land use or, in cases where published cleanup levels were not available, contaminants were removed to concentrations comparable to state background levels or sampled background levels.

Based upon cleanup activities, Ecology has determined the site is no longer a threat to human health and the environment. Ecology made a no further action determination in October 2009.