Heating Oil Tank cleanup site — Restorical Research
Charles R Watts Company
Seattle, King County
Restorical Research
Preliminary Site-Specific Analysis

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 — and recover costs already spent.

This commercial property — a contractors supply store with associated warehouse and office — operated heating oil systems that included a former above-ground storage tank and multiple underground storage tanks connected to a former boiler room by copper supply and return lines. Multiple tanks were reportedly removed in 1977 or 1978; two additional previously undocumented USTs were discovered and removed in 1999. Cleanup under the Voluntary Cleanup Program has included excavation of approximately 400 cubic yards of soil (197 tons disposed off-site), removal of 950 gallons of product and water from the tanks, pumping of 865 gallons of contaminated groundwater, and bioremediation using 1,000 pounds of Oxygen Release Compound. Residual contamination remains subject to a restrictive covenant, with monitoring continuing. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.

Former Use
Former Heating Oil Tank
AddressSeattle, King County
Historical UseHeating Oil Tank
Est. Operating SincePre-1986
StatusCleanup Started
Contamination & Investigation
Site Assessment Summary
ContaminantsPetroleum hydrocarbons (heating oil/diesel and gasoline) from former ASTs and USTs detected in soil and groundwater
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Voluntary Cleanup Program
Ecology Site #1199

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 petroleum contamination at this site traces directly to heating oil and gasoline storage systems that were in active service well before 1986 — documented tank removals in 1977 and 1978 confirm operations during the era when occurrence-based Commercial General Liability policies were the industry standard and carried no effective pollution exclusion in Washington. The two undocumented USTs discovered in 1999, whose fill pipes had been paved over and whose installation the tank lifecycle evidence places around 1974, extend that pre-1986 window further. The remediation expenditures already incurred — soil excavation, groundwater recovery, bioremediation, and long-term monitoring — alongside the costs associated with ongoing monitoring and the residual contamination managed under the restrictive covenant are the type of liabilities that historical carriers may be obligated both to recover and to fund going forward.

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

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 — Coverage and Funding
When Task 1 confirms viable coverage, Restorical works with your legal counsel to tender the claim, negotiate and secure insurance coverage. Restorical will manage the ongoing claim process, including accounting to ensure the insurance companies are funding your remediation 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.