Gas Station cleanup site — Restorical Research
Unocal 0166
Seattle, King County
Restorical Research
Preliminary Site-Specific Analysis

This property has a documented history as a gasoline service station going back to 1930. Historical insurance policies issued during those prior operations and through 1986 could fund a cleanup — and recover costs already spent.

This property operated as a Unocal service station from 1930 through 1960, with underground storage tanks — including one 2,000-gallon and two 3,000-gallon gasoline USTs — installed and in use during that operational period. Remediation work spanning 1996 through 2012 included the excavation and removal of all four tanks, removal of approximately 50 cubic yards and 137 tons of petroleum-impacted soil, installation and decommissioning of groundwater monitoring wells, and multi-year quarterly groundwater monitoring with purge water generation. Subsurface investigations were also conducted as part of the cleanup effort. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.

Former Use
Former Gas Station
AddressSeattle, King County
Historical UseGas Station
Est. Operating Since1930
StatusCleanup Started
Contamination & Investigation
Site Assessment Summary
ContaminantsPetroleum hydrocarbons (gasoline, TPH) from leaking USTs detected in soil and groundwater
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Standard Cleanup
Ecology Site #10356

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 gasoline storage tanks at this site were installed and operated decades before 1986 — some as early as the 1930s — when occurrence-based CGL policies were the industry standard and no effective pollution exclusion had been adopted in Washington. The documented remediation scope here is site-specific and substantial: four UST removals, excavation of 137 tons of petroleum-impacted soil, and sixteen years of quarterly groundwater monitoring with recurring purge water extraction. Carriers who issued CGL policies to Unocal operators during the 1930–1960 window wrote occurrence-based coverage that attaches to this contamination, and those documented cleanup expenditures fall squarely within the scope of that coverage.

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.