Gas Station cleanup site — Restorical Research
Unocal 1726 ENSR International
3301 W Mcgraw St, Seattle, King County
Restorical Research
Preliminary Site-Specific Analysis

This property has a documented history as a gasoline service station going back to 1939. Historical insurance policies issued during those prior operations and through 1986 could fund a cleanup — and recover costs already spent.

This property has operated as a Unocal (Union 76) service station since 1939, with multiple underground storage tanks for gasoline and diesel, fuel islands, and hydraulic hoists installed and replaced across several decades. Cleanup under the Voluntary Cleanup Program included tank and hoist removal, contaminated soil excavation, groundwater pumping and aeration, product bailing, and vapor extraction and bioremediation on an adjacent parcel. Active remedial work and groundwater monitoring continued for multiple years until activity ceased around 2004; the site's cleanup status remains open. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.

Former Use
Former Gas Station
Address3301 W Mcgraw St, Seattle, King County
Historical UseGas Station
Est. Operating Since1939
StatusCleanup Started
Contamination & Investigation
Site Assessment Summary
ContaminantsPetroleum hydrocarbons (gasoline and diesel) from leaking USTs, product lines, and hydraulic hoists detected in soil and groundwater
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Voluntary Cleanup Program
Ecology Site #5716

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 traces to underground storage tanks, product lines, and hydraulic hoists that were installed and operating as far back as 1939 — nearly five decades before occurrence-based CGL policies gave way to claims-made forms with pollution exclusions. The documented remediation expenditures here — tank removals, soil excavation, groundwater treatment, vapor extraction, bioremediation, and years of monitoring — were incurred to address releases tied directly to those pre-1986 operations. Historical carriers who issued CGL policies to Unocal or prior operators during that long operational window may still be obligated both to recover past cleanup costs and to fund the remaining work.

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.