Services Provided



The Port of Tacoma
Tacoma, WA, USA
Site photo


The Arkema site, located in Tacoma, Washington, along the Hylebos Waterway, is a 48-acre former chemical-manufacturing facility now owned by the Port of Tacoma. The facility operated from 1927 to 1997 and produced chlorine, sodium hydroxide (caustic), sodium chlorate, hydrochloric acid, and sodium arsenite (Penite). The primary constituent of concern is arsenic, though other metals have been found as well, in both the groundwater and the soil.

Our Solution

The Arkema site has undergone several remediation activities in conjunction with the Commencement Bay/Nearshore Tide Flats (CB/NT) CERCLA site, as well as a 1987 consent decree under the clean water act. The PIONEER team is working on the Model Toxics Control Act (MTCA) site under an agreed order effective to help with the remediation and redevelopment of the site, which will be eventually used for industrial purposes.


PIONEER is leading soil and groundwater treatment and addressing remediation needs, such as direct contact pathways and potential surface water exposures. Additionally, treatability studies are being conducted, and the production of a cost recovery report is also underway. PIONEER is continuing to provide in-depth knowledge of risk assessment, data management, visualization, and investigative strategies that will lead to effective solutions for the Arkema site.