Gas Station cleanup site — Restorical Research
Shelton Shell
Shelton, Mason County
Restorical Research
Preliminary Site-Specific Analysis

This property has a documented history as a gasoline service station going back to 1979. Historical insurance policies issued during operations at this property and through 1986 could fund a cleanup — and recover costs already spent.

This 0.21-acre property has operated as the Shelton Shell gas station and convenience store, with three single-walled steel underground storage tanks installed in 1979. A leak from one of those USTs was discovered and reported in 2007, revealing gasoline-range petroleum contamination in soil and groundwater. Cleanup under the Voluntary Cleanup Program has included removal of all three USTs, excavation and off-site disposal of 1,324 tons of petroleum-contaminated soil, installation of monitoring wells, and quarterly groundwater monitoring spanning multiple years, with in-situ treatment under consideration. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.

Former Use
Former Gas Station
AddressShelton, Mason County
Historical UseGas Station
Est. Operating Since1979
StatusCleanup Started
Contamination & Investigation
Site Assessment Summary
ContaminantsGasoline-range petroleum hydrocarbons (TPH-G, BTEX) from leaking USTs detected in soil and groundwater
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Voluntary Cleanup Program
Ecology Site #7062

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 petroleum contamination at this property originated from underground storage tanks installed in 1979 — seven years before occurrence-based Commercial General Liability policies gave way to claims-made forms with effective pollution exclusions. The leak went undetected for decades before its 2007 discovery, exactly the kind of long-duration, progressive release that pre-1986 CGL policies were structured to cover. Documented remediation expenditures — tank removal, large-scale soil excavation, well installation, years of groundwater monitoring, and potential in-situ treatment — represent costs that historical carriers on the risk during the 1979–1986 window may be obligated both to reimburse and to fund going forward.

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.