Public Works cleanup site — Restorical Research
Ship Canal Water Quality Project E Shaft
3500 Interlake Ave N, Seattle, King County
Restorical Research
Preliminary Site-Specific Analysis

This property has a documented history as a public works and maintenance facility going back to 1947. Historical insurance policies issued during those prior operations and through 1986 could fund a cleanup.

The City of Seattle acquired this property in 1947 and operated it as a Seattle Department of Transportation maintenance facility and storage yard through 1982, with a paint shop and a print shop (active 1975–1980) among the on-site operations. An underground heating oil storage tank is also present on the property. A site investigation has identified TPH-oil, carcinogenic PAHs (cPAHs), tetrachloroethylene (PCE), and trichloroethylene (TCE) as contaminants of concern in soil and groundwater; remediation — including soil excavation and UST removal, potential biostimulation with PlumeStop®, institutional and engineering controls, and multi-year groundwater monitoring — is planned under Standard Cleanup but has not yet commenced. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.

Former Use
Former Public Works
Address3500 Interlake Ave N, Seattle, King County
Historical UsePublic Works
Est. Operating Since1947
StatusAwaiting Cleanup
Contamination & Investigation
Site Assessment Summary
ContaminantsPetroleum hydrocarbons (TPH-oil), carcinogenic PAHs (cPAHs), tetrachloroethylene (PCE), and trichloroethylene (TCE) in soil and groundwater
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Standard Cleanup
Ecology Site #15291

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 at this property traces to municipal maintenance and storage operations — heating oil tanks, paint-shop solvents, and chlorinated degreasers — that ran from 1947 through at least 1982, spanning nearly four decades of activity before 1986, when occurrence-based CGL policies ceased to be the industry standard. Policies issued to the City of Seattle or its contractors during that operational window carried no effective pollution exclusion under Washington law and remain potentially enforceable today. The remediation expenditures now anticipated — UST removals, soil excavation, groundwater injection, long-term monitoring, and permanent engineering controls — could plausibly be funded by carriers whose policies were in force when these releases first occurred.

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.