Industrial & Manufacturing cleanup site — Restorical Research
General Electric Aviation Div
220 S Dawson St, Seattle, King County
Restorical Research
Preliminary Site-Specific Analysis

This property has a documented history as a industrial and manufacturing facility going back to 1959. Historical insurance policies issued during those prior operations and through 1986 could fund a cleanup — and recover costs already spent.

General Electric Aviation began manufacturing and repairing aircraft equipment at this South Dawson Street facility in 1959, using chlorinated solvent degreasers — trichloroethylene (TCE), tetrachloroethylene (PCE), and 1,1,1-trichloroethane (1,1,1-TCA) — and cutting machinery as part of those operations. The site also held RCRA interim status as a dangerous waste storage facility from 1980 to 1989. Remediation has included independent soil excavation in 1995–1996, continuous groundwater extraction since 1996 via recovery wells designed to pump 16 gpm, sub-slab depressurization and vapor intrusion mitigation since 2007, in-situ chemical oxidation injections in 2017–2018, and in-situ chemical reduction injections in 2019, with in-situ bioremediation under consideration for future phases. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.

Former Use
Former Industrial & Manufacturing
Address220 S Dawson St, Seattle, King County
Historical UseIndustrial & Manufacturing
Est. Operating Since1959
StatusCleanup Started
Contamination & Investigation
Site Assessment Summary
ContaminantsTrichloroethylene (TCE), tetrachloroethylene (PCE), and 1,1,1-trichloroethane (1,1,1-TCA) from chlorinated solvent degreasers detected in soil, groundwater, and soil vapor
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Standard Cleanup
Ecology Site #2446

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 chlorinated-solvent degreasing operations that generated TCE, PCE, and 1,1,1-TCA contamination at this site ran from 1959 through at least the mid-1980s, and GE's concurrent role as a RCRA interim status dangerous waste storage operator from 1980 to 1989 further anchors the contamination timeline to that pre-1986 policy era. Occurrence-based CGL policies issued to GE during those manufacturing decades carried no effective pollution exclusion and remain enforceable against historical carriers today. The documented remediation costs — soil excavation, decades of groundwater extraction, vapor mitigation infrastructure, and two rounds of chemical injection campaigns — are attributable to releases that occurred while those carriers were on the risk.

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.