Bulk Plant cleanup site — Restorical Research
Rainier Brewery Malt House Oil Cistern
5810 5840 Airport Way S, Seattle, King County
Restorical Research
Preliminary Site-Specific Analysis

This property has a documented history as a bulk fuel distribution terminal going back to 1917. Historical insurance policies issued during those prior operations and through 1986 could recover the cleanup costs already paid.

This property was part of the former Rainier Brewery complex, with a large oil cistern — approximately 50 by 35 feet — documented on Sanborn fire insurance maps as far back as 1917 and used to store heavy oil at the Malt House parcel. A remedial excavation in 2020 removed the cistern along with approximately 1,698.56 tons of contaminated soil. Subsequent quarterly groundwater monitoring from September 2023 through June 2024 confirmed that contaminant levels met cleanup standards, resulting in a No Further Action determination and the establishment of institutional controls. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.

Former Use
Former Bulk Plant
Address5810 5840 Airport Way S, Seattle, King County
Historical UseBulk Plant
Est. Operating Since1917
StatusNo Further Action
Contamination & Investigation
Site Assessment Summary
ContaminantsHeavy oil and diesel-range organics (petroleum hydrocarbons) detected in soil and groundwater
Media ImpactedSoil, Groundwater, Air
Regulatory ProgramMTCA — Standard Cleanup
Ecology Site #14964

Why Historical Insurance Policies May Be Accessible

Pre-1986 Commercial General Liability (CGL) policies were occurrence-based and did not contain an effective pollution exclusion in Washington. If contamination occurred while those policies were active, those historical insurance carriers may still have a legal obligation to fund the cleanup costs, even if the business closed or the property changed hands.

The source of petroleum contamination here — a bulk oil cistern in continuous documented use since at least 1917 — predates the 1986 threshold for occurrence-based Commercial General Liability policies by more than six decades. Carriers who issued CGL policies to Rainier Brewery or its operators across those pre-1986 decades did so before effective pollution exclusions became standard, leaving those policies potentially enforceable against the documented remediation costs. The excavation of nearly 1,700 tons of impacted soil and the multi-year groundwater monitoring program that followed represent exactly the category of expenditure those historical policies were written to cover.

Restorical's role is to locate viable historical policies, determine whether a successful cost recovery claim is possible, and assist our clients and their legal counsel to obtain insurance coverage for costs already incurred. Restorical's forensic accounting team works to re-establish and document past cleanup expenditures, ensuring the strongest possible basis for recovery.

Recovering Costs from an Older Cleanup

If this site reached No Further Action years ago, the original cleanup expenditures may be difficult to reconstruct. Restorical's forensic accounting team specializes in re-establishing and documenting past cleanup costs — even decades later — to build the strongest possible basis for an insurance recovery claim.

What We Look For

  • Historical insurance policies (pre-1986)
  • Policy numbers, carrier names, and coverage periods
  • Connection between contamination timing and policy period
  • Evidence linking cleanup obligation to insured activity

What We Deliver

  • Historical Coverage Chart
  • Trigger Analysis & Property/Policy Nexus
  • Coverage strategy with recommendations
  • Insurance funding for your remediation
  • Claims Management & Forensic Accounting

The Restorical Proven Process

Task 1 — Research and Analysis
Restorical searches for viable historical insurance policies, researches the site history, analyzes the contamination impacts, and underwrites potential coverage — including a proprietary trigger analysis. At the end of Task 1, we provide a clear yes or no on whether a successful cost recovery is possible, along with a strategy and recommendation specific to your situation, even if you are not the policyholder.
Task 2 — Cost Recovery
When Task 1 confirms viable coverage, Restorical works with your legal counsel to tender the claim and negotiate recovery of costs already incurred. Restorical's forensic accounting team re-establishes and documents past cleanup expenditures, managing the claim process to ensure the insurance companies fulfill their obligation in a timely manner.

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This analysis is preliminary and based on publicly available records. Restorical Research is not a law firm and does not provide legal advice.