Heating Oil Tank cleanup site — Restorical Research
Avalon University District
4550 11th 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 1905. Historical insurance policies issued during those prior operations and through 1986 could recover the cleanup costs already paid.

This property was occupied by multiple single-family homes from at least 1905 through the mid-1970s, with an apartment building constructed in 1910 and a church built in 1912. Many of the former residences used oil-burning furnaces served by underground heating oil tanks ranging from 250 to 650 gallons. A total of 12 heating oil USTs were decommissioned during a 2012 site redevelopment, with petroleum-impacted groundwater encountered during remedial excavations. The site was enrolled in the Voluntary Cleanup Program and has received a No Further Action determination. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.

Former Use
Former Heating Oil Tank
Address4550 11th Ave NE, Seattle, King County
Historical UseHeating Oil Tank
Est. Operating Since1905
StatusNo Further Action
Contamination & Investigation
Site Assessment Summary
ContaminantsPetroleum hydrocarbons (diesel-range) and non-halogenated organics detected in groundwater; tetrachloroethylene (PCE) also identified in the deeper aquifer from an off-property source
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Voluntary Cleanup Program
Ecology Site #12970

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.

Residential and commercial structures on this property date to at least 1905, placing more than eight decades of continuous operation squarely within the pre-1986 occurrence-based CGL policy era. Heating oil tanks serving these buildings stored and dispensed petroleum products for the better part of the twentieth century, and the petroleum contamination found in groundwater during their 2012 decommissioning is directly attributable to those long-running operations. Historical CGL carriers who insured the property owners during that pre-1986 window may bear obligation for the investigation and remediation costs incurred to achieve the site's No Further Action status.

Restorical's role is to locate viable historical policies, determine whether a successful cost recovery claim is possible, and assist our clients and their legal counsel to obtain insurance coverage for costs already incurred. Restorical's forensic accounting team works to re-establish and document past cleanup expenditures, ensuring the strongest possible basis for recovery.

Recovering Costs from an Older Cleanup

If this site reached No Further Action years ago, the original cleanup expenditures may be difficult to reconstruct. Restorical's forensic accounting team specializes in re-establishing and documenting past cleanup costs — even decades later — to build the strongest possible basis for an insurance recovery claim.

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 — Cost Recovery
When Task 1 confirms viable coverage, Restorical works with your legal counsel to tender the claim and negotiate recovery of costs already incurred. Restorical's forensic accounting team re-establishes and documents past cleanup expenditures, managing the claim process to ensure the insurance companies fulfill their obligation 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.