This property has a documented history as a bulk fuel distribution terminal predating 1986. Historical insurance policies issued during those prior operations and through 1986 could fund a cleanup — and recover costs already spent.
This property operated as Mobil Bulk Plant 46109, a petroleum storage and distribution terminal handling gasoline, diesel, and motor oil at 4401 and 4315 11th Avenue Northwest in Seattle. Remediation activities since at least 1988 have included excavation of former underground storage tanks, an aboveground storage tank, and associated fuel lines, operation of a vapor extraction system and an active in-situ treatment system, and installation of a recovery trench. Historical light petroleum hydrocarbon recovery has totaled up to 350 gallons, and quarterly groundwater monitoring with active purging continues today. 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 detection of both total and dissolved lead in groundwater at this site is a direct marker of operations during the leaded-gasoline era, which ended well before 1986 — placing the contamination origin squarely within the window when occurrence-based Commercial General Liability policies were the industry standard and carried no effective pollution exclusion. Those pre-1986 carriers who issued CGL coverage to the bulk plant's operators during active petroleum storage and distribution remain potentially obligated to respond to this contamination. The documented remediation trail — tank and fuel-line excavations, vapor extraction, in-situ treatment, a recovery trench, and decades of groundwater monitoring — reflects both historical expenditures and ongoing costs that historical policy obligations may 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.


