This property has a documented history as a dry cleaning facility predating 1986. Historical insurance policies issued during those prior operations and through 1986 could fund a cleanup — and recover costs already spent.
The former Four Seasons Dry Cleaners property on Mercer Island carried both dry cleaning and petroleum operations, leaving behind tetrachloroethene (PCE) contamination in soil and groundwater alongside petroleum releases from three underground storage tanks. Remediation under the Voluntary Cleanup Program ran from 1993 through 2009 and included removal of all three USTs, excavation of approximately 6,700 tons of petroleum-contaminated soil and 710 tons of PCE-contaminated soil from the site, recovery of 135 additional tons of petroleum-contaminated material from adjoining parcels, and vapor extraction to address contamination that had migrated beyond the property boundary. Further cleanup action is still required to close the site. 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.
Dry cleaning and fuel storage operations at this Mercer Island property predate 1986, when occurrence-based Commercial General Liability policies carried no effective pollution exclusion — meaning carriers who insured those operations may remain liable for the contamination they covered. The documented remediation record already represents more than sixteen years of active work: three storage tank removals, excavation of over 7,400 tons of contaminated soil on- and off-site, and years of vapor extraction — substantial sunk costs that historical carriers may be obligated to recover. With cleanup work still ongoing, those same pre-1986 policies may also be called upon to fund the continuing remediation costs that lie 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.


