| http://www.w3.org/ns/prov#value | - The flowback water also brings back from underground such naturally existing contaminants as barium, strontium, and radium.Worries about the contaminants took on added urgency after the Monongahela River, a western Pennsylvania waterway that serves as a major source of drinking water for Pittsburgh and communities to its south, became so salty in 2008 that people began complaining about the taste.
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