Landfill cleanup site — Restorical Research
Reserve Silica Reclamation
26000 Black Diamond Ravensdale Rd, Ravensdale, King County
Restorical Research
Preliminary Site-Specific Analysis

This property has a documented history as a landfill going back to 1924. Historical insurance policies issued during those prior operations and through 1986 could fund a cleanup — and recover costs already spent.

This property's industrial history dates to 1924, encompassing underground coal mining (1924–1933), surface sand mining (1968–2007), and the disposal of approximately 175,000 tons of cement kiln dust by a Holcim predecessor into the former mine pit between 1979 and 1988. Caustic seepage from the CKD has been documented since the 1980s, and a Remedial Investigation confirmed groundwater contamination — antimony, arsenic, lead, and vanadium exceeding drinking water standards — along with surface water contamination in the on-site seepage collection ditch and ponds. Cleanup is underway under an Agreed Order with the Washington Department of Ecology. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.

Former Use
Former Landfill
Address26000 Black Diamond Ravensdale Rd, Ravensdale, King County
Historical UseLandfill
Est. Operating Since1924
StatusCleanup Started
Contamination & Investigation
Site Assessment Summary
ContaminantsMetals priority pollutants (antimony, arsenic, lead, vanadium) and corrosive wastes from cement kiln dust disposal in groundwater and surface water
Media ImpactedSoil, Groundwater, Surface Water
Regulatory ProgramMTCA — Standard Cleanup
Ecology Site #4728

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 CKD disposal that produced the contamination at this site began in 1979, and the mining operations it reclaimed date back more than six decades before 1986 — the year occurrence-based Commercial General Liability policies stopped reliably covering pollution claims. The metals contamination now documented in groundwater and surface water is a direct consequence of those pre-1986 disposal activities, and the remediation costs incurred to date — investigation, seepage management, long-term monitoring — along with the cleanup work still ahead fall squarely within the scope of occurrence-based CGL coverage. Historical carriers who insured the operators and arrangers during the 1970s and 1980s may be obligated to fund both past and future remediation expenditures.

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.