Heating Oil Tank cleanup site — Restorical Research
Block 77
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.

Petroleum contamination consisting of diesel- and oil-range organics (DRO+ORO) was detected in fill soil and at the water table in the southern parcel of Block 77, attributed to a suspected former heating oil underground storage tank. An adjacent property — the SDOT 9th Avenue N UST Site — has undergone prior excavation activity tied to the same contamination corridor. Cleanup of contaminated soil and groundwater at Block 77 has not yet commenced; remediation is planned to occur in conjunction with future property redevelopment, indicating a multi-year project ahead. 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
StatusAwaiting Cleanup
Contamination & Investigation
Site Assessment Summary
ContaminantsDiesel- and oil-range organics (DRO+ORO) from a former heating oil UST detected in soil and groundwater
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Standard Cleanup
Ecology Site #17362

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 contamination here is consistently attributed to historical petroleum storage and a former heating oil UST whose operations predate 1986, the period when occurrence-based Commercial General Liability policies carried no effective pollution exclusion. A slow, subsurface release from buried heating oil infrastructure — discovered only through recent investigation, not any recent incident — is precisely the type of long-latency claim those policies were written to address. The investigation and remediation costs now facing the property owner, tied to a soil and groundwater cleanup integrated into redevelopment, could plausibly be funded by historical carriers whose policies were active when the contamination first originated.

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.