Bulk Plant cleanup site — Restorical Research
Mobil Oil Canal Bulk Plant
4401 & 4315 11th Ave NW, Seattle, King County
Restorical Research
Preliminary Site-Specific Analysis

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.

Former Use
Former Bulk Plant
Address4401 & 4315 11th Ave NW, Seattle, King County
Historical UseBulk Plant
Est. Operating SincePre-1986
StatusCleanup Started
Contamination & Investigation
Site Assessment Summary
ContaminantsPetroleum hydrocarbons (gasoline, diesel, and motor oil range) and lead (total and dissolved) detected in soil and groundwater
Media ImpactedSoil, Groundwater, Surface Water
Regulatory ProgramMTCA — Voluntary Cleanup Program
Ecology Site #1389

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

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.