A SIGNAL — Steam and calcium carbonate surges from a ventilation tube temporarily installed at Vincent Avenue and E. 9th Street in downtown Cleveland on March 26, 2012. Marc Divis, president of private energy provider Cleveland Thermal, said his company is using calcium carbonate to detect a possible underground water line leak. Divis added that the ash-like substance flowing from the ventilation tube is inert. Work is expected to be completed today. Photo by Brandon Blackwell @CapturedCLE

A SIGNAL — Steam and calcium carbonate surges from a ventilation tube temporarily installed at Vincent Avenue and E. 9th Street in downtown Cleveland on March 26, 2012. Marc Divis, president of private energy provider Cleveland Thermal, said his company is using calcium carbonate to detect a possible underground water line leak. Divis added that the ash-like substance flowing from the ventilation tube is inert. Work is expected to be completed today. Photo by Brandon Blackwell @CapturedCLE

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