Gas Station cleanup site — Restorical Research
Unocal Service Station 5956
TACOMA, Pierce County
Restorical Research
Preliminary Site-Specific Analysis

This property has a documented history as a gasoline service station going back to 1928. Historical insurance policies issued during those prior operations and through 1986 could fund a cleanup — and recover costs already spent.

This property operated as a gasoline service station from 1928 through 1967, with underground storage tanks installed in 1954 and 1967. Petroleum hydrocarbon contamination in soil and groundwater has been identified in the southwestern portion of the site, attributed to the former Unocal station; a co-located dry cleaner operating from 1946 to 1979 also contributed tetrachloroethylene contamination. Cleanup under the Standard Cleanup program has included UST removals and in-place abandonments, building demolitions, over four years of groundwater recovery and vapor extraction system operation, and groundwater monitoring spanning from 1991 through at least 2021. Further investigative excavations, potential additional vapor extraction, and institutional controls including deed restrictions are planned. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.

Former Use
Former Gas Station
AddressTACOMA, Pierce County
Historical UseGas Station
Est. Operating Since1928
StatusCleanup Started
Contamination & Investigation
Site Assessment Summary
ContaminantsPetroleum hydrocarbons in soil and groundwater; tetrachloroethylene (PCE) from co-located dry cleaning operations
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Standard Cleanup
Ecology Site #5028

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.

Petroleum contamination at this site originated from service station operations that began nearly six decades before 1986, when occurrence-based Commercial General Liability policies were still standard and carried no effective pollution exclusion. The documented remediation expenditures — UST removal, groundwater recovery, vapor extraction, and three decades of monitoring — trace directly to releases from those pre-1986 operations. With cleanup still ongoing and additional investigation and institutional controls yet to come, historical carriers who issued CGL policies during the 1928–1967 operational window may be obligated both to recover past remediation costs and to fund the work that remains.

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.