ARCO Harbor Island Superfund Site SEATTLE, WASHINGTON

Types of Service
• Evaluation of Groundwater and Surface Water Interactions
• Well Pumping Tests
• Remedial System Design,
• Installation and O&M
• Fuel Product Fingerprinting
• Regulatory Negotiation

• Groundwater
• Surface Water
• Soils and Sediments

• Petroleum
• Metals

Project Highlights
• Members of TechSolve have provided ongoing environmental services at the ARCO petroleum bulk storage facility on Harbor Island in Seattle, Washington for nearly 10 years.  During this time, multiple site assessments and investigations have been conducted under an Agreed Order for groundwater, surface water, sediments, and soil including:  site assessments, hazardous waste/petroleum contamination investigations, hydrographic surveys, evaluation of groundwater and surface water interactions, and well pumping tests to determine aquifer characteristics and well capture zones.
• Because the site is under state jurisdiction within a federal CERCLA site, RI/FS activities have been designed and conducted to be consistent with requirements of both CERCLA and MTCA.
• TechSolve currently conducts quarterly groundwater monitoring and reporting, and on-call operation and maintenance of a product recovery system to address a free-phase hydrocarbon plume located beneath a warehouse at the facility.  The RI/FS has been completed, remedial design has been completed, and construction of the final remediation system is underway.
• TechSolve has saved the client significant amounts of money and maximized environmental protection during various phases of work through effective planning and negotiating.  Rapid response and implementation of an interim remediation strategy resulted in greater protection for the adjacent waterway and initiated early cleanup of on-site areas.  A statistical analysis of groundwater samples collected by Geoprobe and by conventional sampling methods convinced the regulatory agency to accept the Geoprobe results in lieu of one quarter of monitoring.  In addition, we successfully negotiated for higher cleanup levels for soils, resulting in lower soil volumes to be excavated.