Williston, N.D. (AP) The North Dakota Department of Mineral Resource says it's adding three new pipeline inspector positions. Department of Mineral Resources Spokeswoman Alison Ritter says the inspectors will deal with oil, gas and waste gathering lines. Gathering lines are pipelines that transport oil, gas and saltwater between well locations or to a central collection point. Ritter says the pipeline inspectors will mostly be focused on making sure new pipeline installations follow regulations. New rules that went into effect in April require gathering pipeline installation to not interfere with agriculture and dictate pipeline trenches to be filled in ways that do not damage the pipelines. The new inspectors will bring the total number of pipeline inspectors at the department to 35.