Heating Oil Tank cleanup site — Restorical Research
Tan & Yang Property
Bothell, Snohomish 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.

The Tan & Yang Property in Bothell, Snohomish County has been identified as a contamination-affected site tracing to a leaking underground home heating oil tank at a neighboring address on 228th Street SE. The source tank was removed in an excavation on July 12, 2006, but petroleum contamination has been identified as likely migrating from the 727 site toward the 805 228th Street SE address. The site is enrolled in Washington's Standard Cleanup program and no active remediation has yet commenced. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.

Former Use
Former Heating Oil Tank
AddressBothell, Snohomish County
Historical UseHeating Oil Tank
Est. Operating SincePre-1986
StatusAwaiting Cleanup
Contamination & Investigation
Site Assessment Summary
ContaminantsPetroleum hydrocarbons from a leaking underground home heating oil tank detected in soil, with contamination identified as migrating to adjacent property
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Standard Cleanup
Ecology Site #3002

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 underground home heating oil tank responsible for this contamination was installed and in operation before 1986 — when occurrence-based Commercial General Liability policies were the industry standard and carried no effective pollution exclusion in Washington State. A pre-1986 CGL policy issued to the responsible party during the tank's operating years may remain enforceable against the petroleum release now documented at this site. With cleanup still pending, the costs of investigation, remedial design, and active cleanup represent expenditures that historical carriers could be obligated to fund.

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.