Landfill cleanup site — Restorical Research
Duwamish Fill
Seattle, King County
Restorical Research
Preliminary Site-Specific Analysis

This property has a documented history as a landfill predating 1986. Historical insurance policies issued during those prior operations and through 1986 could fund a cleanup — and recover costs already spent.

This property was used by the Washington State Department of Transportation (WSDOT) as a street-waste landfill from the late 1960s through the early 1990s, with an earlier and distinct phase of fill material deposited during Highway 599 construction in the mid-1960s. Lead contamination was identified in street-cleaning waste sampled at the site in 1988, consistent with operations during the era of leaded gasoline. Formal remediation of the site's primary contamination has not yet been performed; cleanup activity to date has been limited to removal of a temporary spill-cleanup material stockpile and recurring removal of accumulated refuse. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.

Former Use
Former Landfill
AddressSeattle, King County
Historical UseLandfill
Est. Operating SincePre-1986
StatusCleanup Started
Contamination & Investigation
Site Assessment Summary
ContaminantsLead and contaminants associated with street-cleaning waste detected in fill material
Media ImpactedSoil, Groundwater, Surface Water
Regulatory ProgramMTCA — Standard Cleanup
Ecology Site #77

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.

WSDOT's street-waste landfilling operations at this property spanned from the late 1960s through the early 1990s, encompassing more than a decade of activity that predated the 1986 threshold after which CGL pollution exclusions became standard. Occurrence-based policies issued to WSDOT or its contractors during the pre-1986 portion of that operational window carried no effective pollution exclusion and may be enforceable against the lead contamination documented here. Those historical carriers may be obligated both to recover costs already incurred — stockpile removal, refuse clearance, and site investigation — and to fund the formal remediation of lead-contaminated fill material that lies ahead.

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.