This property has a documented history as a landfill going back to 1978. Historical insurance policies issued during those prior operations and through 1986 could fund a cleanup — and recover costs already spent.
The Sisco Landfill operated from 1978 to 1984, accepting woodwaste, inert demolition materials, and a variety of commercial and industrial wastes at its Wade Road property in Arlington. Contamination concerns emerged as early as 1979, when a fish kill was linked to landfill operations and investigations commenced in 1980. Remediation under the Voluntary Cleanup Program included leachate collection and on-site management from 1985 through 1997, large-scale soil excavation, and importation of cover soil in 1999; documented cleanup activities extended from 1989 to 2011. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.
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 pathway at this site — leachate migrating from a mixed-waste disposal operation into surrounding groundwater and surface water — originated during landfill operations that closed in 1984, before 1986 brought effective pollution exclusions into standard CGL policy language. Operators and property owners who held occurrence-based CGL policies during the landfill's active years and the early leachate-management period may carry coverage obligations that remain enforceable today. The documented remediation expenditures — leachate control infrastructure, soil excavation, site capping, and more than two decades of active cleanup — are the type of costs historical carriers may be obligated both to recover and to fund going forward.
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
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Contact UsThis analysis is preliminary and based on publicly available records. Restorical Research is not a law firm and does not provide legal advice.


