Landfill cleanup site — Restorical Research
Kent Highlands Landfill
240th & Military Rd, Kent, King County
Restorical Research
Preliminary Site-Specific Analysis

This property has a documented history as a landfill going back to 1968. Historical insurance policies issued during those prior operations and through 1986 could fund a cleanup — and recover costs already spent.

This property was a natural ravine adjacent to the Green River that the City of Seattle used as a municipal landfill from 1968 to 1986. A Consent Order between Ecology and the City in 1987 initiated a remediation program that included installation of a geomembrane landfill cap, a landfill gas extraction system, leachate collection and treatment infrastructure, surface water controls, and long-term groundwater monitoring — with the cap and gas system completed by 1996. The site was placed on the National Priorities List in 1990 and remains under active operation, maintenance, and monitoring, with restrictive covenants and cost recovery provisions in place. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.

Former Use
Former Landfill
Address240th & Military Rd, Kent, King County
Historical UseLandfill
Est. Operating Since1968
StatusCleanup Complete — Active O&M/Monitoring
Contamination & Investigation
Site Assessment Summary
ContaminantsLandfill gas and leachate from municipal solid waste disposal, affecting groundwater and requiring surface water controls
Media ImpactedGroundwater
Regulatory ProgramMTCA — Standard Cleanup
Ecology Site #4428

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 City of Seattle's landfilling operations at this site ran from 1968 through 1986 — the full span of the era when occurrence-based Commercial General Liability policies were standard and carried no effective pollution exclusion. The contamination issues here — landfill gas migration and leachate affecting groundwater — resulted from waste disposal conducted entirely within that pre-1986 operational window. The documented remediation expenditures, spanning cap installation, gas extraction, leachate treatment, and decades of continuing monitoring and institutional controls, are tied directly to those historical operations, and the carriers who issued CGL policies to the City during that period may remain obligated to contribute to those costs.

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.