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The oil project in the National Petroleum Reserve-Alaska involves multiple drill sites, a processing facility and gravel roads and pipelines.

“There are multiple drill sergeants that are involved in the investigation,” Garrett said.

Garrett said “multiple drill sergeants” were suspended pending the investigation’s outcome.

Multiple drill holes suggest measurements had to be redone and mistakes corrected.

Peter M. Iwanowicz, the department’s acting commissioner, said many of the comments have criticized the proposed standards for failing to adequately address issues like the cumulative impact of multiple drill sites, disposal of wastewater from the drilling and the protection of drinking water.