Dr. Harold S. Haller proved to the Environmental Protection Agency that the Ashland Petroleum Company's Cattletsburg Refinery was in compliance with the NESHAP permit limits.

Dr. Haller used Six Sigma type methods including control charts to demonstrate to the Environmental Protection Agency that the Cattletsburg Refinery was in compliance with the NESHAP permit limits. This meant that the refinery was not subject to a substantial fine as the EPA claimed.