Project Objectives:

SLR conducted a remedial investigation and feasibility study (RI/FS) in accordance with a Washington's Model Toxic Control Act (MTCA) agreed order. 

Our Role:

SLR's work is being performed at a 47-acre, former bulk fuel terminal to allow for future site development as a multi-modal transportation terminal.  The contaminants of concern were identified as arsenic and petroleum hydrocarbons.  For the ongoing feasibility study, SLR is negotiating soil and groundwater cleanup levels that are based on protection of surface water.  Prior to the completion of the feasibility study, SLR designed and directed several large interim actions, including soil and sediment removal work, to allow for the sale and redevelopment of a 22-acre portion of the site.  Sediment removal design work included the design of temporary coffer dams for a tidally-influenced stream to allow for dewatering and sediment removal and design of the treatment system for water extracted from soil excavations.  The treatment system was designed to use a Chitosan polymer to flocculate suspended sediments.