Rigid standards were proposed for the control of the odorant injection rate required for natural gas along with a increased frequency of inspection of each odorizer and a maximum interval between the dates of the sampling of the-gas in the odorized piping systems to assure the presence of an appropriate level of odorization. Review of the comments to Notice 1 published in the Federal Register, February 22,1979 (44 FR 10604), has convinced MTB that the proposal was not practical and would not increase the level of safety sufficiently to justify the very high estimated cost. Odorizing equipment to replace wick and by-pass odorizers on small gas systems that may be capable of meeting the proposed limits are very costly and lack the reliability of the present equipment. As a consequence, the proposed standards are withdrawn.