This property has a documented history as a property with a heating oil tank going back to 1950. Historical insurance policies issued during those prior operations and through 1986 could fund a cleanup — and recover costs already spent.
This former single-family residence in Seattle operated with a 300-gallon heating oil underground storage tank from 1950 through 1990, when the property's residential use ended. Following UST removal, a release of diesel-range petroleum hydrocarbons was confirmed in soil and groundwater, prompting cleanup between May and July 2005 that included removal of the tank, excavation of 822.36 tons of contaminated soil, and pumping of 700 gallons of affected groundwater, with the excavation area subsequently backfilled with clean imported material. The site was placed on Ecology's Confirmed and Suspected Contaminated Sites List in June 2007, with Voluntary Cleanup Program involvement running from 2007 until the program was terminated due to inactivity in 2010. 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 heating oil UST at this Seattle residence was in operation for decades before 1986, the last year occurrence-based Commercial General Liability policies were routinely issued without effective pollution exclusions. The diesel contamination found in the soil and groundwater here is a slow release tied directly to that pre-1986 operational period. Documented remediation costs — UST removal, excavation of more than 822 tons of impacted soil, groundwater recovery, and regulatory oversight — represent expenditures that historical CGL carriers whose policies were in force during the tank's operational life may be obligated both to recover and to fund as the cleanup continues.
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
Ready to learn more?
Contact UsThis analysis is preliminary and based on publicly available records. Restorical Research is not a law firm and does not provide legal advice.


