Gas Station cleanup site — Restorical Research
Seattle Hilton Hotel Parking Garage
1301 6th Ave, Seattle, King County
Restorical Research
Preliminary Site-Specific Analysis

This property has a documented history as a gasoline service station going back to 1970. Historical insurance policies issued during those prior operations and through 1986 could fund a cleanup — and recover costs already spent.

This property was developed as the Seattle Hilton Hotel and Parking Garage around 1970, with two 2,000-gallon gasoline underground storage tanks installed along the eastern property line at the time of construction. One tank leaked and was replaced in the early 1970s; both were abandoned in place with cement slurry in 1985. Cleanup activities under the Voluntary Cleanup Program have included soil excavation exceeding 1,900 cubic yards across multiple construction projects, installation of a single-phase skimmer pump system for free product recovery, planned follow-up groundwater treatment, and at least two years of scheduled quarterly groundwater monitoring supplemented by natural attenuation. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.

Former Use
Former Gas Station
Address1301 6th Ave, Seattle, King County
Historical UseGas Station
Est. Operating Since1970
StatusCleanup Started
Contamination & Investigation
Site Assessment Summary
ContaminantsPetroleum hydrocarbons and lead from leaking gasoline USTs detected in soil and groundwater, including recoverable free product
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Voluntary Cleanup Program
Ecology Site #436

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 gasoline USTs at this site were installed, operated, and confirmed to have leaked between 1970 and 1985 — entirely within the window when occurrence-based Commercial General Liability policies were the industry standard and carried no effective pollution exclusion in Washington. The documented release includes lead alongside gasoline, a combination characteristic of fuel formulations from that era that further anchors the contamination to those pre-1986 operations. The remediation costs incurred and still forthcoming — soil excavation, free product recovery, groundwater treatment, and long-term monitoring — represent expenditures that historical carriers who issued CGL policies to the hotel and its parking facility during those years may be obligated to fund.

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.