Landfill cleanup site — Restorical Research
Sinnes Road Landfill
Mount Vernon, Skagit County
Restorical Research
Preliminary Site-Specific Analysis

This property has a documented history as a landfill going back to 1967. Historical insurance policies issued during those prior operations and through 1986 could fund a cleanup.

The Sinnes Road Landfill occupies a former sand and gravel quarry in Skagit County that Skagit County operated as a disposal site for household and nearby agricultural waste from approximately 1967 through 1975. Contamination — including vinyl chloride, toluene, and methane consistent with decomposing landfill waste — has been identified at the property. A remedial action work plan was developed calling for waste excavation, regrading, and segregation; installation of a groundwater interception system; construction of a passive landfill gas collection and ventilation system; a multi-layer cap; stormwater management infrastructure; hydroseeding; and a monitoring well network, with project activities set to begin in June 2010. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.

Former Use
Former Landfill
AddressMount Vernon, Skagit County
Historical UseLandfill
Est. Operating Since1967
StatusAwaiting Cleanup
Contamination & Investigation
Site Assessment Summary
ContaminantsVinyl chloride, toluene, and methane from landfill waste decomposition in soil and groundwater
Media ImpactedSoil, Groundwater, Surface Water
Regulatory ProgramMTCA — Standard Cleanup
Ecology Site #4798

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.

Landfill operations at this site ran from 1967 to 1975 — more than a decade before 1986, when occurrence-based Commercial General Liability policies still carried no effective pollution exclusion in Washington. The contamination documented here — vinyl chloride, toluene, and methane produced by the slow decomposition of buried household and agricultural waste — is precisely the type of gradual, continuing release those pre-1986 policies were written to address. The remediation expenditures the responsible parties now face — excavation, groundwater interception, gas collection, cap construction, and long-term monitoring — may be recoverable from historical carriers whose policies were in force during the years Skagit County operated the landfill.

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.