Region 10 issued an Administrative Compliance Order on Consent (COC) in response to an Excess Emission and Permit Deviation Report, dated September 6, 2012, notifying Region 10 that Shell was violating several permit requirements that occurred when it began drilling in the Chukchi Sea Outer Continental Shelf off AlaskaÂs North Slope. The Region had issued a final Outer Continental Shelf/Prevention of Significant Deterioration Clean Air Act permit to Shell for the Discoverer drillship and support fleet. On June 29, 2012, Shell submitted an application to revise its air permit, requesting increases in some of the permit's emission limits based on new information about engine performance, and to revise limits based on incorrect assumptions. The COC sets interim emissions limits for the companyÂs activities as well as imposes additional operating, monitoring, and reporting requirements. The interim limits are expected to ensure that ShellÂs operations will meet National Ambient Air Quality Standards until Region 10 completes a full review of ShellÂs application to revise the permit. Due to the drastically shortened drilling season (due in part to sea ice), the Discoverer's overall emissions for this drilling season are expected to be lower even if operating at the limits set forth in the COC as compared to emissions that would have been authorized for an entire drilling season under the permit.