Misreported leak volumes often happen once companies and officials investigate accidents and discover oil seeped deeper in the ground or waterways. Indeed, revised figures are at times much larger than first reported.
In 2014, for instance, an oil spill in North Dakota was first reported to have caused a loss of 750 barrels of oil, but that figure climbed to about 20,600 barrels once the soil was further investigated.
It is unclear whether latest oil spill has reached the groundwater. The investigation and remediation is ongoing, the state said. The Grand Forks Herald said that spills have been reported at the same Denbury site in 2006, 2010, and 2014. The cause of the most recent spill is listed as a failure of an underground flow line.
Oil transportation largely relies on trains and pipelines. Out of those two, pipelines spill less often but larger quantities than trains, yet train accidents can be deadlier since trains are more likely to explode.
Other Denbury Onshore LLC sites have spilled in North Dakota in recent months. Just in May, pastureland in the northwest had to be excavated after more than 120,000 gallons of oil and drilling wastewater overflowed from a company’s tank./SOURCE