This property has a documented history as a farm and agricultural operation going back to 1961. Historical insurance policies issued during those prior operations and through 1986 could recover the cleanup costs already paid.
Aircraft Applicator, Inc. leased a portion of Prosser Airport beginning in 1961 and operated an aerial herbicide and pesticide application business there through 2007, with operations centered on the storage, mixing, and loading of pesticides onto aircraft. Cleanup under the Voluntary Cleanup Program ran from 2006 through 2019, encompassing the removal of 15,675 tons and 8,264 cubic yards of contaminated soil, treatment of groundwater with 114,450 pounds of RegenOx chemical oxidant, installation of at least 11 monitoring wells, and placement of an environmental covenant for institutional control. The site has reached No Further Action status, with ongoing groundwater monitoring and periodic reviews continuing. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.
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.
Pesticide and herbicide contamination at this property traces directly to more than four decades of aerial application operations that began in 1961 — a quarter century before 1986, when occurrence-based Commercial General Liability policies were the industry standard and carried no effective pollution exclusion. The scale of documented remediation here — over 15,000 tons of excavated soil, more than 100,000 pounds of chemical oxidant injected into the groundwater, and 13 years of active cleanup — reflects expenditures tied entirely to pre-1986 operations. Historical carriers who issued CGL policies to Aircraft Applicator, Inc. during that operational window may still be obligated to recover those costs.
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
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Contact UsThis analysis is preliminary and based on publicly available records. Restorical Research is not a law firm and does not provide legal advice.


