Industrial & Manufacturing cleanup site — Restorical Research
Delta Air Lines Seattle
Seatac, King County
Restorical Research
Preliminary Site-Specific Analysis

This property has a documented history as a industrial and manufacturing facility going back to 1967. Historical insurance policies issued during those prior operations and through 1986 could fund a cleanup — and recover costs already spent.

This property served as a Delta Air Lines maintenance and operations facility at Seattle-Tacoma International Airport, with underground storage tanks holding gasoline, diesel, mineral spirits, ethylene glycol, and waste oil — consistent with large-scale vehicle and aircraft support operations. Six USTs and two hydraulic hoists were removed in 1992 and 2000, and approximately 1,770 cubic yards of petroleum-contaminated soil were overexcavated, with 650 cubic yards disposed off-site and 150 cubic yards treated on-site through aeration and biodegradation. Cleanup work is ongoing. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.

Former Use
Former Industrial & Manufacturing
AddressSeatac, King County
Historical UseIndustrial & Manufacturing
Est. Operating Since1967
StatusCleanup Started
Contamination & Investigation
Site Assessment Summary
ContaminantsPetroleum hydrocarbons (gasoline, diesel), mineral spirits, ethylene glycol, and waste oil detected in soil
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Standard Cleanup
Ecology Site #7048

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 underground storage tanks removed from this facility in 1992 were likely installed decades earlier, placing the origin of contamination well before 1986 — the year occurrence-based Commercial General Liability policies stopped reliably covering pollution claims in Washington. The documented remediation expenditures — tank removals, hydraulic hoist decommissioning, large-scale soil excavation, off-site disposal, and on-site treatment — represent costs tied directly to those long-running pre-1986 operations. Historical carriers who issued CGL policies during the period these tanks were in service may be obligated both to recover past cleanup costs and to fund the remediation still ahead.

Restorical's role is to locate viable historical policies, determine whether a successful coverage claim is possible, and assist our clients and their legal counsel to obtain insurance coverage. Restorical then manages the claim, including accounting, to ensure the cleanup is funded in a timely manner.

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 — Coverage and Funding
When Task 1 confirms viable coverage, Restorical works with your legal counsel to tender the claim, negotiate and secure insurance coverage. Restorical will manage the ongoing claim process, including accounting to ensure the insurance companies are funding your remediation 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.