Gas Station cleanup site — Restorical Research
EVO Interlake
3535 Interlake Ave N, Seattle, King County
Restorical Research
Preliminary Site-Specific Analysis

This property has a documented history as a gasoline service station predating 1986. 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 gasoline service station, with at least two underground storage tanks spanning areas A, B, and C identified as the source of gasoline-range petroleum hydrocarbon (TPH) contamination in soil and groundwater. Remediation under the PLIA Petroleum Technical Assistance Program has been active since at least February 2019, encompassing UST removals, soil excavation to address contamination exceeding MTCA cleanup levels, extensive soil sampling, and calculation of site-specific cleanup levels. Groundwater contamination remains part of ongoing remediation efforts, and a no-further-action determination for the site is currently 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
Address3535 Interlake Ave N, Seattle, King County
Historical UseGas Station
Est. Operating SincePre-1986
StatusCleanup Started
Contamination & Investigation
Site Assessment Summary
ContaminantsPetroleum hydrocarbons (TPH), gasoline-range, detected in soil and groundwater
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Standard Cleanup
Ecology Site #14884

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 contamination here traces directly to a former gasoline underground storage tank — the type of system that was standard practice at service stations well before 1986, when occurrence-based Commercial General Liability policies were still written without effective pollution exclusions. A gasoline release from a former UST is precisely the slow, latent discharge those pre-1986 policies were structured to cover. The documented remediation trail — UST removals, soil excavation, groundwater work, and years of site-specific cleanup analysis under a state technical assistance program — represents expenditures that historical carriers who issued CGL coverage during the operational window may be obligated to fund.

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.