Gas Station cleanup site — Restorical Research
Unocal 0355
159 Denny Way, Seattle, King County
Restorical Research
Preliminary Site-Specific Analysis

This property has a documented history as a gasoline service station going back to 1924. 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 retail gasoline station from at least 1924 through 1992, when the most recent service station facilities were removed. Cleanup under the Voluntary Cleanup Program has been ongoing since at least 1988, with remedial actions including excavation of waste oil drums and contaminated soil — a 2005 event alone removed over 26,000 tons — repeated recovery of free product from groundwater, and installation of vapor barriers and sub-slab vapor collection systems. Groundwater monitoring continues under Ecology mandate. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.

Former Use
Former Gas Station
Address159 Denny Way, Seattle, King County
Historical UseGas Station
Est. Operating Since1924
StatusCleanup Started
Contamination & Investigation
Site Assessment Summary
ContaminantsPetroleum hydrocarbons (BTEX, TPH-G) and diesel in soil and groundwater, with vapor intrusion requiring sub-slab collection
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Voluntary Cleanup Program
Ecology Site #5879

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 site originated from underground storage tanks and product lines serving a gas station that operated for nearly seven decades before 1986, squarely within the era of occurrence-based Commercial General Liability policies that carried no effective pollution exclusion in Washington. The scale of documented remediation — tens of thousands of tons of soil removed, free-product recovery, vapor mitigation, and decades of mandated monitoring — represents substantial expenditures that historical carriers who insured operations during the 1924-to-1986 window may be obligated both to reimburse and to fund as cleanup continues.

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.