Heating Oil Tank cleanup site — Restorical Research
Ballard Blossom Assemblage
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 1900. Historical insurance policies issued during those prior operations and through 1986 could fund a cleanup — and recover costs already spent.

The Ballard Blossom Assemblage comprises multiple parcels in Seattle with buildings dating to 1900, 1906, 1930, and 1954. Heating oil underground storage tanks served the older structures for decades — two 300-gallon USTs were removed from Lot 5 in 2007, and a 675-gallon UST was decommissioned in place on Lot 2. A Phase II Environmental Site Assessment confirmed diesel-range petroleum exceeding MTCA Method A cleanup levels in multiple monitoring wells, light non-aqueous phase liquid observed at one boring, and chlorinated solvents including PCE and TCE in Lot 2 groundwater originating from an adjacent former dry cleaner. Cleanup is underway through the Voluntary Cleanup Program. 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 Since1900
StatusCleanup Started
Contamination & Investigation
Site Assessment Summary
ContaminantsDiesel-range and gasoline-range petroleum hydrocarbons, polycyclic aromatic hydrocarbons (PAHs), and chlorinated solvents (PCE, TCE, DCE, vinyl chloride) detected in groundwater
Media ImpactedSoil, Groundwater, Air
Regulatory ProgramMTCA — Voluntary Cleanup Program
Ecology Site #17411

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 buildings on this assemblage date to 1900 and 1906, and their heating oil infrastructure was operational for decades before 1986 — the year occurrence-based Commercial General Liability policies gave way to claims-made forms with absolute pollution exclusions. Petroleum impacts confirmed across the property trace directly to historical releases from those long-serving heating oil tanks, as documented in AECOM's investigation. The remediation costs already incurred and those still ahead — site investigation, groundwater monitoring, and cleanup of diesel-range contamination and free-phase product — represent liabilities that historical CGL carriers who covered the property during its pre-1986 operational window may 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.