Industrial & Manufacturing cleanup site — Restorical Research
Kromona Mine & Mill
Sultan, Snohomish County
Restorical Research
Preliminary Site-Specific Analysis

This property has a documented history as a industrial and manufacturing facility predating 1986. Historical insurance policies issued during those prior operations and through 1986 could fund a cleanup.

The Kromona Mine & Mill is an abandoned mine land site in Sultan, Snohomish County, where historical mining operations left a legacy of heavy metal contamination in the surrounding soil. Preliminary investigation has confirmed soil concentrations exceeding state cleanup levels for at least eighteen metals, including arsenic, lead, cadmium, mercury, zinc, copper, cobalt, nickel, antimony, thallium, and selenium. Planned remediation includes engineered containment repositories constructed with impermeable geotextile material and French drain systems, interim actions, and post-cleanup confirmation sampling; active cleanup work has not yet commenced. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.

Former Use
Former Industrial & Manufacturing
AddressSultan, Snohomish County
Historical UseIndustrial & Manufacturing
Est. Operating SincePre-1986
StatusAwaiting Cleanup
Contamination & Investigation
Site Assessment Summary
ContaminantsHeavy metals (arsenic, lead, cadmium, mercury, zinc, copper, cobalt, nickel, antimony, thallium, selenium, vanadium, silver, aluminum, barium, iron, and manganese) detected in soil at concentrations exceeding state cleanup levels
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Standard Cleanup
Ecology Site #3973

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 heavy metal contamination at this site is a direct product of legacy mining activity that predated 1986 by decades — the kind of slow, cumulative release that occurrence-based CGL policies were written to cover before broad pollution exclusions became standard. None of the contamination here reflects a recent incident; it reflects years of mineral extraction and processing at a property that has since been abandoned. The costs now facing responsible parties — engineered containment, interim actions, and long-term confirmation sampling — represent cleanup expenditures that historical carriers whose policies were in force during those mining operations 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

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.