Landfill cleanup site — Restorical Research
Regional Localized Arsenic Plume Steamboat Slough
Sr 529, Marysville, Snohomish 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.

The Regional Localized Arsenic Plume Steamboat Slough study area along SR 529 in Marysville borders the Tulalip Landfill (Ecology FSID #191), a delisted National Priority List site with confirmed soil and groundwater contamination including metals, pesticides, ammonia, carcinogenic polycyclic aromatic hydrocarbons (cPAHs), and PCBs. Contamination detected within the study area is considered potentially migrated from that adjacent landfill source. Past remediation at the landfill included installation of an impermeable cover, and groundwater sampling activities at the study area have generated purge water managed in 55-gallon drums on-site. The site is enrolled in Standard Cleanup and awaits active remediation. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.

Former Use
Former Landfill
AddressSr 529, Marysville, Snohomish County
Historical UseLandfill
Est. Operating SincePre-1986
StatusAwaiting Cleanup
Contamination & Investigation
Site Assessment Summary
ContaminantsMetals (including arsenic), pesticides, ammonia, carcinogenic polycyclic aromatic hydrocarbons (cPAHs), and PCBs in soil and groundwater
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Standard Cleanup
Ecology Site #16673

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 plume affecting this study area traces to landfill operations that almost certainly predate 1986 — the Tulalip Landfill's NPL designation reflects the severity and antiquity of its contamination, and indicator compounds such as PCBs and cPAHs are characteristic of pre-1986 industrial disposal practices. Occurrence-based CGL policies issued to the landfill operators during that pre-1986 window carried no effective pollution exclusion and remain legally enforceable today. As the study area now faces forward remediation expenditures under Standard Cleanup, historical carriers whose policies were in force during the operative period of contamination may be obligated to fund 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.