Heating Oil Tank cleanup site — Restorical Research
Clarwood Apartments
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 1924. Historical insurance policies issued during those prior operations and through 1986 could fund a cleanup — and recover costs already spent.

The Clarwood Apartments building was constructed in 1924 and heated by an oil burner system from its inception, with a heating oil underground storage tank (UST) installed beneath the basement boiler room. A dual-fuel burner was installed in 1975, confirming continued heating oil use through at least that date. UST tightness testing subsequently revealed the tank was not tight, and soil sampling near the closed-in-place tank confirmed diesel-range petroleum hydrocarbon concentrations well above Washington Ecology cleanup levels. The UST was closed in place by filling with inert material in 1998; an estimated 442 cubic yards of impacted soil has been identified, and a groundwater monitoring well was installed. The site participated in the Voluntary Cleanup Program, which was later terminated due to inactivity. 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 Since1924
StatusCleanup Started
Contamination & Investigation
Site Assessment Summary
ContaminantsDiesel-range petroleum hydrocarbons (TPH) from leaking heating oil UST detected in soil
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Voluntary Cleanup Program
Ecology Site #2571

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.

Heating oil operations at Clarwood Apartments ran from 1924 through at least 1975 — more than five decades during which the building's operators held occurrence-based Commercial General Liability policies that carried no effective pollution exclusion under Washington law. The diesel-range petroleum hydrocarbon contamination confirmed in the soil here traces directly to those pre-1986 operations, meaning historical carriers who issued CGL coverage during that window may be obligated to fund both the investigation and UST closure costs already incurred and the remediation of the 442 cubic yards of impacted soil that still awaits cleanup.

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.