Seems too early to tell doesn't it? I don't think you can safely say "it would hardly register" without knowing the results from the contaminated regions...
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Water Runoff
Responding crews discovered contaminated runoff on two surface water streams: Sulphur Run and Leslie Run. Under Ohio EPA oversight, Norfolk Southern emergency response contractors installed booms and underflow dams to restrict the flow of contaminated water as well as contain and collect floating product.
U.S. EPA took water samples at the streams and has sent them to a laboratory for analysis. Emergency response staff noticed impacted aquatic life and notified the Ohio Department of Natural Resources and the U.S. Department of Interior. Ohio DNR is on site and is assessing the situation and the impacts to aquatic life. Downstream water utilities were also notified.