Gas Station cleanup site — Restorical Research
Lius 76
23206 56th Ave W, Mountlake Terrace, Snohomish County
Restorical Research
Preliminary Site-Specific Analysis

This property has a documented history as a gasoline service station going back to 1976. Historical insurance policies issued during those prior operations and through 1986 could fund a cleanup.

This property has operated as a gasoline station since at least 1976, when the commercial structure was built, with three 10,000-gallon underground storage tanks used for gasoline storage. UST removal was conducted in 2025, and groundwater sampling confirmed petroleum contamination far exceeding MTCA Method A cleanup levels — benzene at 88 µg/L against a standard of 5, gasoline at 19,000 µg/L against 800, toluene at 1,300 µg/L against 1,000, and xylenes at 4,300 µg/L against 9. The site is currently awaiting cleanup under the Standard Cleanup program. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.

Former Use
Former Gas Station
Address23206 56th Ave W, Mountlake Terrace, Snohomish County
Historical UseGas Station
Est. Operating Since1976
StatusAwaiting Cleanup
Contamination & Investigation
Site Assessment Summary
ContaminantsBenzene, toluene, xylenes, and petroleum-gasoline hydrocarbons detected in groundwater
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Standard Cleanup
Ecology Site #17450

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.

Gasoline storage and dispensing operations at this property began in 1976, a full decade before occurrence-based CGL policies gave way to claims-made forms with absolute pollution exclusions. The groundwater contamination confirmed beneath the site — with benzene exceeding its cleanup level by a factor of seventeen and xylenes by nearly five hundred — points to a substantial and sustained release from those pre-1986 operations that will require extended monitoring and remediation to resolve. Historical carriers who insured the facility during that operational window may bear obligation for the costs now required to bring groundwater concentrations back to regulatory standards.

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.