Heating Oil Tank cleanup site — Restorical Research
Mentzer Heating Oil Tank
30610 52nd Ave S, Auburn, 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.

This Auburn residential property was the site of a leaking heating oil underground storage tank that caused petroleum contamination in soil at concentrations reaching 12,000 ppm, first discovered in 2009. The property owner removed the tank in compliance with Ecology standards, over-excavated contaminated soil, and applied bio-agents to address residual contamination, with active treatment expected to run approximately one year. The site is currently awaiting further cleanup. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.

Former Use
Former Heating Oil Tank
Address30610 52nd Ave S, Auburn, King County
Historical UseHeating Oil Tank
Est. Operating SincePre-1986
StatusAwaiting Cleanup
Contamination & Investigation
Site Assessment Summary
ContaminantsPetroleum hydrocarbons from a leaking heating oil UST detected in soil at concentrations up to 12,000 ppm
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Standard Cleanup
Ecology Site #13271

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.

A heating oil tank removed by 2010 — and consistent with pre-1986 installation under standard tank lifecycle assumptions — would have been placed when occurrence-based Commercial General Liability policies were still the industry norm and carried no effective pollution exclusion. The contamination documented at this property originated from that historical tank operation, and the remediation costs already incurred — tank removal, soil excavation, and bioremediation — trace directly to the release that began during the pre-1986 coverage window. Historical CGL carriers whose policies were in force during the tank's operational years may bear an obligation to fund the cleanup costs still outstanding.

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.