Bulk Plant cleanup site — Restorical Research
SemMaterials LP Spokane
4327 N Thor St, Spokane, Spokane County
Restorical Research
Preliminary Site-Specific Analysis

This property has a documented history as a bulk fuel distribution terminal going back to 1955. Historical insurance policies issued during those prior operations and through 1986 could fund a cleanup — and recover costs already spent.

This property has operated as an asphalt and petroleum bulk storage facility since 1955, with 54 aboveground storage tanks (ASTs) holding up to 12.5 million gallons used in the production of asphalt cement, cutback materials, and the storage of petroleum products. Contamination is linked to decades of AST operations; three tanks were dismantled, and a bioventing system ran from 1997 through 2004. Ongoing remediation includes installing and maintaining soil caps, decommissioning six groundwater monitoring wells, implementing institutional controls, and conducting periodic long-term reviews. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.

Former Use
Former Bulk Plant
Address4327 N Thor St, Spokane, Spokane County
Historical UseBulk Plant
Est. Operating Since1955
StatusCleanup Started
Contamination & Investigation
Site Assessment Summary
ContaminantsPetroleum hydrocarbons from aboveground storage tank (AST) operations detected in soil and groundwater
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Standard Cleanup
Ecology Site #3229

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 operators running this 54-tank, 12.5-million-gallon bulk facility through the 1970s and 1980s would have carried substantial Commercial General Liability coverage — policies issued during those decades that predate the 1986 shift and remain enforceable against historical carriers today. Contamination here traces to AST operations beginning in 1955 and continuing through the 1992 tank dismantling, a span in which multiple named operators cycled through the site before pollution exclusions became standard. The documented remediation costs — bioventing, soil capping, well decommissioning, and long-term institutional controls — are directly tied to that pre-1986 operational record, which the carriers who underwrote 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.

Ready to learn more?

Contact Us

This analysis is preliminary and based on publicly available records. Restorical Research is not a law firm and does not provide legal advice.