Farm/Agriculture cleanup site — Restorical Research
Midstate Aviation
Ellensburg, Kittitas County
Restorical Research
Preliminary Site-Specific Analysis

This property has a documented history as a farm and agricultural operation going back to 1961. Historical insurance policies issued during operations at this property and through 1986 could recover the cleanup costs already paid.

Midstate Aviation has operated as an aerial pesticide application service at this Ellensburg site since 1961, performing crop-dusting operations and handling pesticides and herbicides including DDT, Dinoseb, Simazine, and Atrazine. Incidental spills and releases during aircraft tank loading and rinsing contaminated both soil and groundwater over decades of operation. Remediation included excavation and off-site disposal of approximately 2,000 cubic yards of pesticide-contaminated soil, a Remedial Investigation/Feasibility Study, and groundwater monitoring conducted from at least 1994 onward, with initial state-administered cleanup costs exceeding $54,000. The site has received a No Further Action determination. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.

Former Use
Former Farm/Agriculture
AddressEllensburg, Kittitas County
Historical UseFarm/Agriculture
Est. Operating Since1961
StatusNo Further Action
Contamination & Investigation
Site Assessment Summary
ContaminantsDDT, Dinoseb, Simazine, and Atrazine (pesticides and herbicides) detected in soil and groundwater
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Standard Cleanup
Ecology Site #3846

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.

Aerial pesticide application operations at this property began in 1961 — more than two decades before 1986, when occurrence-based Commercial General Liability policies routinely lacked effective pollution exclusions. The contamination here arose from repeated pesticide mixing, aircraft tank loading, and rinsing practices spanning those pre-1986 operational years, the kind of slow, diffuse release that occurrence-based CGL policies were written to address. The documented remediation costs — thousands of cubic yards of excavated soil, a multi-year RI/FS, and ongoing groundwater monitoring — represent expenditures that historical carriers whose policies were in force during that operational window may still be obligated to recover.

Restorical's role is to locate viable historical policies, determine whether a successful cost recovery claim is possible, and assist our clients and their legal counsel to obtain insurance coverage for costs already incurred. Restorical's forensic accounting team works to re-establish and document past cleanup expenditures, ensuring the strongest possible basis for recovery.

Recovering Costs from an Older Cleanup

If this site reached No Further Action years ago, the original cleanup expenditures may be difficult to reconstruct. Restorical's forensic accounting team specializes in re-establishing and documenting past cleanup costs — even decades later — to build the strongest possible basis for an insurance recovery claim.

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 — Cost Recovery
When Task 1 confirms viable coverage, Restorical works with your legal counsel to tender the claim and negotiate recovery of costs already incurred. Restorical's forensic accounting team re-establishes and documents past cleanup expenditures, managing the claim process to ensure the insurance companies fulfill their obligation in a timely manner.

Ready to learn more?

Contact Us

This analysis is preliminary and based on publicly available records. Restorical Research is not a law firm and does not provide legal advice.