Public Works cleanup site — Restorical Research
Northshore Sch Dist 417 Support Service
18421 98th Ave NE, Bothell, King County
Restorical Research
Preliminary Site-Specific Analysis

This property has a documented history as a public works and maintenance facility going back to 1939. Historical insurance policies issued during operations at this property and through 1986 could fund a cleanup — and recover costs already spent.

This property has served as the Northshore School District's bus operations campus since at least 1939, housing a bus maintenance shop, a bus washing facility, and a fueling area with underground storage tanks for diesel and unleaded gasoline. Cleanup activities under the Voluntary Cleanup Program have included passive free product recovery in late 2007 and early 2008, major soil excavations in 2010 and 2014 — the 2014 excavation removing approximately 3,164 tons of petroleum-contaminated soil — and multi-year groundwater monitoring ongoing since 2013. Further remedial actions and well decommissioning remain planned for the broader site. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.

Former Use
Former Public Works
Address18421 98th Ave NE, Bothell, King County
Historical UsePublic Works
Est. Operating Since1939
StatusCleanup Started
Contamination & Investigation
Site Assessment Summary
ContaminantsPetroleum hydrocarbons (diesel and gasoline) from underground storage tanks detected in soil and groundwater, including recoverable free product
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Voluntary Cleanup Program
Ecology Site #4385

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 petroleum releases here are tied to fueling and maintenance operations that stretch back decades before 1986: underground storage tanks at this facility were being removed as early as 1966, meaning the original tank infrastructure was installed and operating well before occurrence-based CGL policies incorporated effective pollution exclusions. The documented remediation trail — soil excavations removing thousands of tons, years of groundwater monitoring, and additional cleanup still ahead — represents costs attributable to those pre-1986 operational releases. Historical carriers who issued CGL policies to the school district during that long pre-1986 window may be obligated to fund both the expenditures already incurred and the remediation work yet to come.

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.