Gas Station cleanup site — Restorical Research
Unocal 0907 ENSR International
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 gasoline service station from 1930 to 1978, with pump islands and underground storage tanks serving retail fuel sales for nearly five decades. Cleanup activities beginning in 2002 included excavation of the suspected UST area, operation of a Soil Vapor Extraction system from 2002 to 2003 with additional SVE wells installed in 2005, oxygen-releasing compound injections for groundwater treatment in 2003, and extensive groundwater monitoring through 2008. The site was enrolled in the Voluntary Cleanup Program from 2005 until its termination in 2008 due to dormancy. 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
ContaminantsGasoline, benzene, diesel, and lead detected in soil and groundwater
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Voluntary Cleanup Program
Ecology Site #5300

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.

Petroleum contamination at this property — gasoline, benzene, diesel, and lead indicative of leaded-fuel dispensing — originated from service station operations that began more than half a century before 1986. Occurrence-based CGL policies issued to operators during that 1930-to-1978 window carried no effective pollution exclusion under Washington law. The documented remediation expenditures — UST-area excavation, vapor extraction, groundwater injection treatment, and years of monitoring — represent costs the historical carriers may be obligated to recover, and the dormant status of the cleanup suggests additional remediation costs may yet be incurred.

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.