Gas Station cleanup site — Restorical Research
Stillwater Store
9301 Carnation Duvall Rd NE, Carnation, King County
Restorical Research
Preliminary Site-Specific Analysis

This property has a documented history as a gasoline service station going back to 1931. Historical insurance policies issued during those prior operations and through 1986 could fund a cleanup — and recover costs already spent.

The Stillwater Store property has operated as a fueling station since at least 1931, the year its on-site building was constructed, with underground storage tanks used for gasoline dispensing throughout its operational history. Investigation confirmed gasoline-range hydrocarbon contamination in both soil and groundwater directly associated with those fueling operations, and closed-in-place USTs remain on the property as a potential ongoing contamination source. A recommendation has been made to install groundwater monitoring wells to track contaminant concentrations, and cleanup is underway. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.

Former Use
Former Gas Station
Address9301 Carnation Duvall Rd NE, Carnation, King County
Historical UseGas Station
Est. Operating Since1931
StatusCleanup Started
Contamination & Investigation
Site Assessment Summary
ContaminantsGasoline-range petroleum hydrocarbons (TPH) detected in soil and groundwater from historical UST operations
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Standard Cleanup
Ecology Site #16827

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.

Fueling operations at this property — anchored by a building constructed in 1931 — predate the 1986 threshold by more than five decades, well within the window when occurrence-based Commercial General Liability policies carried no effective pollution exclusion in Washington. The gasoline-range hydrocarbon contamination documented in soil and groundwater here traces directly to those historical UST operations, and the costs of investigation, monitoring, and active remediation are precisely the expenditures that pre-1986 carriers may be obligated both to recover 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.