Odors. In any zone, no odorous material may be emitted into the atmosphere in quantities sufficient to be detected without instruments. Any process, which may involve the creation or emission of any odors, shall be provided with a secondary safeguard system, so that control will be maintained. Table 1 (Odor Thresholds in Air) in Part 1 (Odor Thresholds for 53 Commercial Chemicals) of "Research on Chemical Odors," copyrighted October 1968, by the Manufacturing Chemists Association, Inc., Washington, D.C., shall be used as a guide in determining quantities of offensive odors.