Farm/Agriculture cleanup site — Restorical Research
Hamakami Estate USTs
14733 SE Green Valley Rd, Auburn, King 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 — and recover costs already spent.

This 27.60-acre farming and residential property on SE Green Valley Road in Auburn housed two underground storage tanks used exclusively to fuel Hamakami farm vehicles with gasoline and diesel. Contamination arose from thin holes and welding failures in those tanks, releasing petroleum into the surrounding soil and groundwater. In January 2018, both USTs were removed and 166.68 tons of petroleum-contaminated soil were excavated and disposed of under the Voluntary Cleanup Program, with groundwater observed in the excavation pit. Remediation remains an ongoing multi-year effort. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.

Former Use
Former Farm/Agriculture
Address14733 SE Green Valley Rd, Auburn, King County
Historical UseFarm/Agriculture
Est. Operating SincePre-1986
StatusCleanup Started
Contamination & Investigation
Site Assessment Summary
ContaminantsPetroleum hydrocarbons (gasoline and/or diesel) from leaking USTs detected in soil and groundwater
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Voluntary Cleanup Program
Ecology Site #14823

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.

A structure on the property dating to 1937 and the farm vehicle fueling infrastructure it supported place UST operations well within the pre-1986 era — the period when occurrence-based CGL policies covering agricultural properties carried no effective pollution exclusion. The welding failures and material degradation that allowed contamination to develop here are precisely the kind of gradual, hidden releases those policies were written to address. Documented cleanup expenditures tied specifically to the Hamakami farm USTs — tank removal, soil excavation, and continuing groundwater work — may be recoverable from carriers that issued CGL policies to the property or farm operators during the decades those tanks were in service.

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.