This property has a documented history as a property with a heating oil tank predating 1986. Historical insurance policies issued during those prior operations and through 1986 could fund a cleanup.
A previously unknown and unregistered diesel underground storage tank was discovered beneath the foundation of Wilkeson Elementary during decommissioning activities in 2018. Remediation has included UST removal and multiple phases of contaminated soil excavation from the tank pit, beneath a building footing, and from test pits, with vacuum truck equipment used for soil removal and direct push drilling performed for site characterization. Residual contamination remains beneath the building foundation and is currently inaccessible to further remediation. 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 "unknown and unregistered" status of this diesel UST strongly implies installation and operation predating the federal registration requirements that took effect around 1986 — the same era when occurrence-based Commercial General Liability policies carried no effective pollution exclusion. The contamination pattern here, attributed to historical leakage rather than a discrete spill, is precisely the type of slow ongoing release those pre-1986 policies were written to address. Cleanup costs — excavation, characterization drilling, and the unresolved remediation beneath the building foundation — represent expenditures that historical carriers whose policies were in force during the tank's operational life may be obligated to fund.
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.


