Underground Storage Tank Services

Seattle Central College
UST Decomissioning, Site Assessment

Seattle, WA 

Key Tasks:

  • UST Decommissioning and Environmental Site Assessment

  • On-Site Field Testing

  • Health & Safety Management

Key Features:

  • Reclaimed and donated approximately 500 gallons of diesel fuel

  • Completed all tasks (UST removal, Site Assessment, Site Restoration, and Demobilization) in less than 6 days.

 

In support of facility upgrades, GEI provided the decommissioning and environmental site assessment of one 1,000-gallon underground storage tank (UST) at the Seattle Central College (SCC) in Seattle, Washington.

GEI was faced with several challenges throughout this project, including very a limited site footprint, fragile site access, and a very limited time frame.  In order to provide safe access and use to the area in the upcoming farmers’ market, GEI completed the UST decommissioning, UST environmental site assessment, backfilling, and demobilization in less than six days.  

 

Former Pharmaceutical Campus 
UST Decomissioning, Site Assessment

Seattle, WA 

Key Tasks:

  • UST Decommissioning and Environmental Site Assessment

  • On-Site Field Testing

  • Health & Safety Management

Key Features:

  • Reclaimed and donated approximately 5,000 gallons of diesel fuel

  • Completed all tasks (UST decommissioning, Site Assessment, Site Restoration, and Demobilization) in less than 10 days.

  • Carefully choreographed site subcontractors to pump 33 truckloads (approximately 325 cubic yards) of CDF fill in under one day.

 

GEI completed UST decommissioning and environmental site assessment for three 20,000 gallon diesel tanks as part of a redevelopment of a 40-acre pharmaceutical campus which was recently acquired by one of the world’s largest online travel business.  For this project, the client opted for closure in place which included the installation of 33 truckloads (approximately 325 cubic yards) of controlled density fill (CDF) after properly cleaning and inerting each tank. Following the decommissioning activities, GEI completed a full UST environmental site assessment to investigate for potential environmental impacts related to the UST system.  

Additionally, GEI managed the disposal of other non-related hazardous materials which were stockpiled at the site.

GEI completed the services ahead of schedule and under budget, thus providing construction crews and other stakeholders to advance their on-site activities.

Former Gas Station
Environmental Remediation, Health & Safety Management, and UST

Seattle, WA 

Key Tasks:

  • Environmental Contamination Characterization and Remediation in Soil and Water

  • On-Site Field Testing

  • Health & Safety Management

  • Assist with Negotiations for Cost Recovery with Responsible Party

Key Features:

  • Cleanup of 4,000 tons of petroleum-contaminated soil

  • Extraction and recycling of 20,000 gallons of petroleum contaminated groundwater 

GEI conducted UST decommissioning, site remediation, and health & safety management during the redevelopment of a former retail fuel station into residential apartments.  This project included the removal of one small (500 gallon) UST, excavation, transportation, and thermal desorption of 4,000 tons of petroleum-contaminated soil, extraction and recycling of 20,000 gallons of petroleum contaminated groundwater, installation of a bentonite slurry wall, installation of several groundwater monitoring wells and installation of a sub-slab depressurization system (SSD).  GEI’s negotiation with the Washington State Petroleum Technical Assistance Program (PTAP) is expected to obtain a NFA determination by the first quarter of 2020.

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© 2019 by Galloway Environmental, Inc.

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