Industrial & Manufacturing cleanup site — Restorical Research
NW Pipeline Station Prosser
505 SW Sr 22, Prosser, Benton County
Restorical Research
Preliminary Site-Specific Analysis

This property has a documented history as a industrial and manufacturing facility predating 1986. Historical insurance policies issued during operations at this property and through 1986 could recover the cleanup costs already paid.

This property operates as a natural gas meter station under Northwest Pipeline GP, where differential pressure manometers historically used inorganic mercury to measure gas flow volumes through the pipeline network. Accidental mercury spillage during routine maintenance and calibration of those instruments contaminated the surrounding soil, prompting an initial excavation of two drums of impacted material in 1990 and a more extensive excavation and re-dig in 2009 under the Voluntary Cleanup Program, which had been formalized in 2005. The 2009 work disposed of 24.39 tons of non-hazardous soil and one bag of WT02-classified dangerous waste, followed by backfilling and site restoration. The site has since 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 Industrial & Manufacturing
Address505 SW Sr 22, Prosser, Benton County
Historical UseIndustrial & Manufacturing
Est. Operating SincePre-1986
StatusNo Further Action
Contamination & Investigation
Site Assessment Summary
ContaminantsInorganic mercury in soil from accidental spillage during maintenance and calibration of differential pressure manometers
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Voluntary Cleanup Program
Ecology Site #3714

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 contamination at this station traces directly to mercury-containing manometers that were phased out in the mid-to-late 1980s, placing the operative release events within the period when occurrence-based CGL policies carried no effective pollution exclusion. A cleanup program that began in the early 1990s and required two separate rounds of soil excavation spanning nearly twenty years reflects the remediation liability that accumulated from those pre-1986 metering operations. Historical carriers who issued CGL policies to Northwest Pipeline GP while those mercury-charged instruments were in active use may still be obligated to recover the documented excavation, disposal, and restoration 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

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.

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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.