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In October 2019, the City of Vancouver teamed with Pure Technologies, a Xylem brand (Pure) to perform a condition assessment on a section of the Charles Street Transmission Main. The project utilized a high-resolution ultrasonic condition assessment tool that inspects the pipeline while still in service, identifying areas of wall thickness loss, and assessing lining and out-of-roundness. The condition assessment tool is free-swimming, which allowed this critical transmission main to remain in service during the inspection. The inspection was completed on a 2.9-km section of the 800-mm riveted steel Charles Street Transmission Main, installed in 1912. As part of the project, Pure also inspected this section of pipeline using other technology as a prescreening acoustic tool to locate leaks and pockets of trapped air. While the prescreening inspection did not detect acoustic events characteristic of leaks, the free-swimming ultrasonic condition assessment tool identified five pipe sections with wall loss anomalies. Pure provided dig sheets to identify the location of those pipes. In July 2020, the City of Vancouver excavated one of the pipe sections that showed wall loss anomalies which validated the results. Once exposed, the City decided to apply petrolatum tape to the pipe exterior to slow the progression of corrosion, as corrosion can lead to significant blowout type failures. Their proactive approach to pipeline management helped mitigate the risks of main failure, including loss of service due to unplanned shutdowns and potential for property damage to customers. With the information provided from the inspection, the City of Vancouver is now armed with powerful new insights to prioritize investment and reduce the incidence of dangerous, expensive, and unplanned water outage events.