A chemical waste landfill near Arlington accepted radioactive fracking waste from North Dakota in violation of Oregon regulations. Oregon Energy Department authorities say the company won’t be fined because state officials believe landfill operators misunderstood state guidelines and were unaware of the violations.  The Oregonian/OregonLive reported that Oregon Department of Energy officials issued a violation notice to Chemical Waste Management for accepting a total of 2 million pounds of Bakken oil field waste delivered by rail to Arlington in three of the last four years.  A Montana company dumped the waste with landfill officials permission, some of which registered radium at 300 times the state’s limits.  State nuclear waste remediation specialist Jeff Burright says on average, the waste dumped at the landfill about eight miles from the Columbia River registered radium at 140 picocuries per gram, while the state’s maximum level is 5 picocuries. Regulators said they determined the biggest risks would be if the waste were ingested or inhaled, if people faced direct exposure or if it emitted radon.  Currently, Burright says the state does not believe there is a risk because of how the waste is stored at the landfill facility, including being covered by at least 10 feet of other material.  State officials say they learned the material was at the landfill through a phone tip from a citizen.