At last report, the Ohio Emergency Management Agency had declared that successful containment of the spilled chemicals meant no further derailment-related die-offs were expected, and that “live fish were returning to Leslie Run,” the nearest small waterway. But local residents remain concerned about the health of waterways. Many worry that toxins may have settled into sediments, posing a persistent danger to benthic organisms (plants and animals at the bottom of the waterway). Those toxins are ready to be released at the slightest disturbance—as simple as a dog chasing a stick, or a wading child.