Reuters 1/4 Law enforcement officers advance into the main opposition camp against the Dakota Access oil pipeline near Cannon Ball, North Dakota, U.S., February 23, 2017. REUTERS/Terray Sylvester/File Photo Read More July 22 (Reuters) - The U.S. Department of Transportation's pipeline regulator on Thursday put the operator of the Dakota Access Pipeline (DAPL), Energy Transfer LP (ET.N), on notice for probable violations of safety regulations and proposed a civil penalty against it. The U.S. Pipeline and Hazardous Materials Safety Administration (PHMSA) notice listed probable violations ranging from the location of storm water drainage at six pipeline facilities and failure to follow assessment guidelines relating to possible incidents in sensitive areas where the pipeline operates.