This property has a documented history as a property with a heating oil tank going back to 1976. Historical insurance policies issued during those prior operations and through 1986 could recover the cleanup costs already paid.
This Seattle residence was the site of a leaking underground storage tank that released petroleum hydrocarbons into the soil and groundwater beneath the property. An independent remedial action was conducted and documented in a Contaminated Soil/Water Remediation Report; Ecology's Toxics Cleanup Program subsequently reviewed the work and confirmed that no further remedial action is necessary. 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.
Applying the standard tank lifecycle rule, a residential heating oil tank remediated in 2001 was likely installed around 1976 — placing its operating years within the period when homeowners and property owners routinely carried occurrence-based liability policies that contained no effective pollution exclusion. A residential property owner who installed a heating oil tank in the mid-1970s would have been unaware that the policy in force at the time of the release could carry an obligation to fund cleanup costs. The remediation expenditures documented here — now closed with a No Further Action determination — represent costs that historical carriers whose policies covered this property during that tank's operational life may be obligated to recover.
Restorical's role is to locate viable historical policies, determine whether a successful cost recovery claim is possible, and assist our clients and their legal counsel to obtain insurance coverage for costs already incurred. Restorical's forensic accounting team works to re-establish and document past cleanup expenditures, ensuring the strongest possible basis for recovery.
Recovering Costs from an Older Cleanup
If this site reached No Further Action years ago, the original cleanup expenditures may be difficult to reconstruct. Restorical's forensic accounting team specializes in re-establishing and documenting past cleanup costs — even decades later — to build the strongest possible basis for an insurance recovery claim.
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.


