Farm/Agriculture cleanup site — Restorical Research
Vanderzanden Farm (Former)
Washington County
Restorical Research
Preliminary Site-Specific Analysis

This property has a documented history as a farm and agricultural operation predating 1986. Historical insurance policies issued during those prior operations and through 1986 could help fund the ongoing and future cleanup under Oregon DEQ oversight.

This 173-acre former agricultural property in Washington County has been in farm use for over a century, with an adjacent historic trap range at Banks Sunset Park contributing extensive lead contamination — up to 114,000 ppm in soil and up to 5,040 ppb in groundwater — alongside DDE and DDT pesticides detected in soil from historical agricultural application. The site is enrolled in Oregon DEQ's Voluntary Cleanup Program with a responsible party under agreement, yet approximately 2.81 acres of lead-contaminated soil on Tax Lot 600 still exceeds DEQ risk-based concentrations and has not been remediated. Cleanup cost estimates range from $644,000 to $1.7 million for soil removal alone, and a 2023 ISM investigation confirmed lead above ecological benchmarks in additional areas of the site. That history could support an insurance coverage claim against the carriers who issued policies more than 40 years ago — coverage that could help fund the cleanup ahead.

Former Use
Former Farm/Agriculture
LocationWashington County
Historical UseFarm/Agriculture
Est. Operating SincePredating 1986
Project StatusAssigned
Contamination & Investigation
Site Assessment Summary
ContaminantsLead (up to 114,000 ppm in soil, up to 5,040 ppb in groundwater), DDE and DDT pesticides in soil
Regulatory ProgramOregon DEQ — Cleanup Program / VCP
DEQ ECSI #5918

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 Oregon — and those policies may provide coverage that remains enforceable today. 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.

Both the agricultural pesticide applications and the lead deposition from the historic trap range trace to operations that were well established before 1986, with farming on this 173-acre Washington County property spanning over a century and the adjacent Banks Sunset Park trap range contributing extensive soil and groundwater contamination across decades of use. The remediation of Tax Lot 600, additional ecological cleanup where lead continues to exceed risk-based concentrations, and ongoing groundwater monitoring directed by Oregon DEQ represent substantial future costs that pre-1986 carriers whose policies were in effect during those decades of contaminating activity may be obligated to 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

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 viable insurance coverage exists to fund the cleanup, 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.