This property has a documented history as a industrial and manufacturing facility going back to 1959. Historical insurance policies issued during those prior operations and through 1986 could fund a cleanup — and recover costs already spent.
This property in Milton was contaminated by industrial waste from USG's Tacoma mineral fiber insulation manufacturing plant, which used ASARCO slag as a raw material from approximately 1959 to 1973. Arsenic-enriched baghouse dust generated during that manufacturing process was deposited as fill at the Highway 99 site from 1971 through 1973. USG purchased the property in 1982 and conducted a cleanup action from October 1984 through January 1985, excavating between 20,000 and 30,000 cubic yards of contaminated waste and regrading the site. Remedial investigations resumed between 2009 and 2013, encompassing groundwater, soil, sediment, and surface water sampling, with an environmental covenant and additional remediation proposed as next steps. 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 here — arsenic-enriched industrial fill deposited between 1971 and 1973 — predates 1986 by more than a decade, placing it within the era when occurrence-based Commercial General Liability policies carried no effective pollution exclusion in Washington. USG and its predecessors operated the Tacoma manufacturing plant throughout that pre-1986 window and arranged for the fill disposal that created the contamination; CGL policies issued to those operators during those years remain potentially enforceable today. The site's documented remediation costs — the 1984–1985 excavation of tens of thousands of cubic yards, years of subsequent investigation, and anticipated future remediation — are precisely the category of liability those historical carriers may be obligated to fund.
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.


