This property has a documented history as a industrial and manufacturing facility going back to 1956. 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 lumber mill before Seattle Door Company (Sedorco) acquired it in 1956 and constructed a large manufacturing facility. The wood-treatment area on the site — where wooden doors were dipped in tanks of pentachlorophenol (PCP) liquid — is the source of the contamination now under remediation. Multi-year cleanup efforts under the Voluntary Cleanup Program have included multiple phases of soil excavation, groundwater treatment through passive collection, multi-phase extraction combined with in-situ chemical oxidation (MPE/ISCO), chemical treatment using EHC® ISCR Reagent, and extensive long-term groundwater monitoring. Cleanup work is ongoing. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.
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 contamination at this property — pentachlorophenol and petroleum hydrocarbons — originated from industrial wood-treatment operations that began in the 1950s, well before 1986, when occurrence-based Commercial General Liability policies were still the industry norm and carried no effective pollution exclusion. The continuous, process-driven release of PCP from the door-dipping operation is precisely the kind of exposure those pre-1986 policies were written to address. Historical carriers who issued CGL coverage to Sedorco or its predecessors during that operational window may be obligated both to recover the remediation costs already incurred and to fund the cleanup work that remains 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
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Contact UsThis analysis is preliminary and based on publicly available records. Restorical Research is not a law firm and does not provide legal advice.


