Farm/Agriculture cleanup site — Restorical Research
Pentachlorophenol Tank
Yelm, Thurston 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 fund a cleanup.

This residential farm property in Yelm was the site of a pentachlorophenol (PCP) dip tank used historically to treat timbers, with diesel mixed into the tank to increase product penetration into the wood. Independent cleanup actions have included excavation of a 16-by-20-by-5-foot area and removal of approximately 122.58 tons of contaminated soil, along with removal and disposal of the historic dip tank. Remaining soil contamination and potential groundwater impacts have not yet been remediated, and no active cleanup of those residual concerns has commenced. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.

Former Use
Former Farm/Agriculture
AddressYelm, Thurston County
Historical UseFarm/Agriculture
Est. Operating SincePre-1986
StatusAwaiting Cleanup
Contamination & Investigation
Site Assessment Summary
ContaminantsPentachlorophenol (PCP) and petroleum hydrocarbons (diesel) detected in soil, with potential groundwater impacts
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Standard Cleanup
Ecology Site #14552

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.

Pentachlorophenol use for timber treatment — particularly when combined with diesel — was a widespread agricultural practice before 1986, after which it was heavily regulated and largely phased out, placing the contamination-generating operations squarely within the era of occurrence-based CGL policies that carried no effective pollution exclusion. The remediation completed to date, including excavation of over 122 tons of PCP- and diesel-affected soil and removal of the dip tank, represents only the opening phase of cleanup, with soil and groundwater remediation costs still ahead. Historical carriers whose CGL policies were in force during the years the dip tank operated may be obligated to fund both the costs already incurred and the cleanup 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.