Public Works cleanup site — Restorical Research
SDOT Delridge ROW
5601 23rd Ave SW, Seattle, King County
Restorical Research
Preliminary Site-Specific Analysis

This property has a documented history as a public works and maintenance facility going back to 1948. Historical insurance policies issued during those prior operations and through 1986 could fund a cleanup.

Seattle City Light acquired this property in 1948 and operated a 4-kilovolt electrical substation here until 2011, spanning over six decades of continuous public utility use. PCB contamination confirmed in groundwater has been traced to a specific vandalism incident in 2011, and lead and petroleum diesel have also been detected in groundwater at the site. The property is currently awaiting cleanup under Washington's Standard Cleanup program, with no active remediation yet commenced. That history could support an insurance cost recovery claim against carriers who issued insurance policies 40+ years ago.

Former Use
Former Public Works
Address5601 23rd Ave SW, Seattle, King County
Historical UsePublic Works
Est. Operating Since1948
StatusAwaiting Cleanup
Contamination & Investigation
Site Assessment Summary
ContaminantsPCBs and lead detected in groundwater; petroleum diesel also present in groundwater
Media ImpactedSoil, Groundwater
Regulatory ProgramMTCA — Standard Cleanup
Ecology Site #13251

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.

This property's substation operations began in 1948 — 38 years before the 1986 shift away from occurrence-based CGL policies that carried no effective pollution exclusion. While the site's PCB contamination has been attributed to a 2011 vandalism incident rather than routine operations, lead detected in groundwater at a property with nearly four decades of pre-1986 electrical infrastructure use may reflect releases tied to that earlier operational window. To the extent any contamination at the site originated during the pre-1986 period, historical carriers whose policies covered the substation's operations could bear obligation toward the cleanup costs this property now faces.

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.