Heating Oil Tank cleanup site — Restorical Research
Kent Elementary School
Kent, King County
Restorical Research
Preliminary Site-Specific Analysis

This property has a documented history as a property with a heating oil tank going back to 1940. Historical insurance policies issued during those prior operations and through 1986 could recover the cleanup costs already paid.

Kent Elementary School operated with a 3,000-gallon heating oil underground storage tank assumed to have been installed in the 1940s, which developed corrosion and holes over decades of service and released petroleum hydrocarbons into the surrounding soil. Under the Voluntary Cleanup Program, the tank was removed in August 1998; approximately 45 cubic yards (57.68 tons) of petroleum-impacted soil were excavated and disposed of off-site; and four groundwater monitoring wells were installed, with quarterly monitoring reports submitted through 1999. Ecology subsequently confirmed that no heating oil hydrocarbons remained above MTCA Method A cleanup levels, and the site received a No Further Action determination. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.

Former Use
Former Heating Oil Tank
AddressKent, King County
Historical UseHeating Oil Tank
Est. Operating Since1940
StatusNo Further Action
Contamination & Investigation
Site Assessment Summary
ContaminantsPetroleum hydrocarbons from heating oil detected in soil; groundwater monitored for residual contamination
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Voluntary Cleanup Program
Ecology Site #1676

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 tank at this property was installed in the 1940s — more than four decades before 1986, the year occurrence-based Commercial General Liability policies began incorporating effective pollution exclusions in Washington. The contamination here was a slow, corrosion-driven release from a tank that was actively supplying the school throughout that entire pre-1986 period, precisely the category of ongoing release those policies were written to cover. Historical carriers who issued CGL coverage during that operational window may remain obligated to contribute to the documented remediation costs — tank removal, soil excavation, and multi-year groundwater monitoring — incurred to address the release.

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

Task 1 — Research and Analysis
Restorical searches for viable historical insurance policies, researches the site history, analyzes the contamination impacts, and underwrites potential coverage — including a proprietary trigger analysis. At the end of Task 1, we provide a clear yes or no on whether a successful cost recovery is possible, along with a strategy and recommendation specific to your situation, even if you are not the policyholder.
Task 2 — Cost Recovery
When Task 1 confirms viable coverage, Restorical works with your legal counsel to tender the claim and negotiate recovery of costs already incurred. Restorical's forensic accounting team re-establishes and documents past cleanup expenditures, managing the claim process to ensure the insurance companies fulfill their obligation in a timely manner.

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This analysis is preliminary and based on publicly available records. Restorical Research is not a law firm and does not provide legal advice.