Heating Oil Tank cleanup site — Restorical Research
Edwards on 5th
2619 5th Ave, 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 — and recover costs already spent.

The contamination at this Seattle apartment property originated from a 1,650-gallon underground storage tank used to supply heating oil to the building; the UST was in service until a natural gas heating system replaced it sometime between 1975 and 1981, and the tank itself remained on-site until its removal in 1995. Cleanup under the Voluntary Cleanup Program has proceeded since 1995 and has included soil excavation of approximately 160 cubic yards, UST removal, periodic manual LNAPL recovery, enhanced fluid recovery, and in-situ chemical oxidation. Proposed future remediation — multi-phase extraction, air sparging, soil vapor extraction, and continued operation of vapor intrusion mitigation systems — carries an estimated cost of $1,244,000, with ongoing monitoring and natural attenuation consideration 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
Address2619 5th Ave, Seattle, King County
Historical UseHeating Oil Tank
Est. Operating SincePre-1986
StatusCleanup Started
Contamination & Investigation
Site Assessment Summary
ContaminantsDiesel-range petroleum hydrocarbons (TPH) from a former heating oil UST detected in soil, groundwater, and soil vapor
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Voluntary Cleanup Program
Ecology Site #3896

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 release at this property is directly tied to a heating oil UST that was actively in service well before 1986, when occurrence-based Commercial General Liability policies were still the industry standard and carried no effective pollution exclusion in Washington. Historical carriers who issued CGL policies to the building operator during that pre-1986 window may be obligated both to recover the remediation costs already incurred — three decades of excavation, tank removal, LNAPL recovery, and in-situ treatment — and to fund the estimated $1,244,000 in future cleanup work the site still requires. The documented link between pre-1986 heating oil operations and the diesel-range contamination now driving a multi-year remediation program makes this property a strong candidate for historical insurance recovery.

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.