Heating Oil Tank cleanup site — Restorical Research
Astion Heating Oil Tank
6220 38th Ave NE, Seattle, 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 1946. Historical insurance policies issued during those prior operations and through 1986 could fund a cleanup — and recover costs already spent.

This residential site encompasses two properties — the Astion and McIntyre parcels — whose homes were both built in 1946 and heated by underground storage tanks that subsequently leaked diesel-range petroleum hydrocarbons into soil and groundwater. Remediation to date has included removal of a 300-gallon home-heating-oil UST, mass excavation of 180 tons of petroleum-contaminated soil, vacuum-truck removal of impacted groundwater, and a multi-step footing-drain flushing program using water, surfactant, and an oxygen-release compound. Additional work encompassed bioremediation, structural pin-pile installation, foundation crack repair, utility replacement, and full landscape restoration; cleanup is ongoing. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.

Former Use
Former Heating Oil Tank
Address6220 38th Ave NE, Seattle, King County
Historical UseHeating Oil Tank
Est. Operating Since1946
StatusCleanup Started
Contamination & Investigation
Site Assessment Summary
ContaminantsDiesel-range petroleum hydrocarbons (DRO) from former heating-oil USTs detected in soil and groundwater
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Standard Cleanup
Ecology Site #12846

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 releases here originated from heating-oil tanks installed when these homes were built in 1946 — nearly four decades before occurrence-based Commercial General Liability policies began routinely excluding pollution claims. The contamination reflects the slow, long-running leakage pattern that pre-1986 CGL policies were written to address, and the remediation record documents substantial expenditures: UST removal, extensive soil excavation, groundwater treatment, and structural repairs necessitated by the cleanup itself. Historical carriers who issued CGL policies to the property owners during that pre-1986 operational window may be obligated both to recover those past costs and to fund the cleanup work that remains.

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.