Pipeline Safety Interpretation PI-75-0115

Page 1PI-75-0115 December 2, 1975 Mr. John Searcy Engineering Division Tennessee Public Service Commission Cordell Hull Building Nashville, Tennessee 37219 Dear Mr. Searcy: This responds to your letter of November 12, 1975, in which you ask the following questions: 1. Is it correct that when an interpretation of a regulation is issued that the interpretation has the same effective date as the regulation itself, not the date that it is issued? Answer: Unless otherwise specified in the interpretation, an interpretive rule becomes effective upon publication in the Federal Register or when persons subject to the rule have actual and timely notice of it, as the case may be. 2. Is it correct that if an interpretation of a regulation is issued but does not appear in the "Advisory Bulletin" that it is still applicable to all operators subject to Public Law 90-481 and Part 192? ANSWER: Any interpretive rule of general applicability which is not published in the Advisory Bulletin would only apply to those persons who have notice of it through some means other than the Advisory Bulletin. We trust this satisfactorily responds to your inquiry. Sincerely, Cesar DeLeon Acting Director Office of Pipeline Safety Operations#

Page 2November 12, 1975 Cesar DeLeon U. S. Department of Transportation Office of Pipeline Safety 2100 Second Street, SW Washington, D.C. 20590 Dear Mr. DeLeon: 1. Is it correct that when an interpretation of a regulation is issued that the interpretation has the same effective date as the regulation itself, not the date that it is issued? 2. Is it correct that if an interpretation of a regulation is issued but does not appear in the "Advisory Bulletin", that it is still applicable to all operators subject to Public Law 90- 481 and Part 192? Sincerely, John Searcy Engineering Division#