Sohio Petroleum Company — Pipeline Safety Interpretation

Page 1September 11, 1984 Mr. Pilar Esteve de lier Division Contracts Engineer Sohio Petroleum Company Suite 1200 9401 Southwest Freeway Houston, Texas 77074 Dear Mr. lier: This is in response to your letter dated August 10, 1984, submitting a notification under §195.8 of the proposed use of a 1000' section and a 420' section of "Pag-O-Flex" pipe in an offshore pipeline. We understand that this type of flexible pipe has been used successfully offshore in situations similar to those you propose. Further, the proposed test pressure exceeds that required by §195.302(b)(2). Consequently, we find that your proposal is not unduly hazardous. Sincerely, Original signed by Richard L Beam Associate Director for Pipeline Safety Regulation Materials Transportation Bureau#

Page 2Attention: The Secretary of Department of Transportation Gentlemen: Subject: Notification Required Under DOT 49CFR Part 195.8 Transportation of Hazardous Material Please note two corrections to letter dated August 8, 1984. The first paragraph, first sentence, South Pass Block 49 should read South Pass Block Paragraph two, under the pipeline design criteria: Working Pressure should be changed to Test Pressure. The letter should read as follows: Petroleum Company plans to initiate crude oil transportation from Mississippi Canyon Block 20-A platform to a subsea tie-in in South Pass Block 50 in December 1984. (Proposed Pipeline Route - Attachment 1). The pipeline a 6" line approximately 54,900 ft. long consisting Pag-O-Flex seamless pipe sections. A 1000 ft. section of Pag-0-Flex will extend from the platform riser and a 420 ft. section of Pag-0-Flex will be installed at the subsea tie-in to protect the pipeline from mudflows. The pipeline design criteria is as follows: Design Pressure 1440 psig Operating Pressure 875 psig Test Pressure 2160 psig Design Temperature 115°F Design Flowrate 8000 BOPD The Pag-0-Flex material and testing procedures hereto. These lines have been specially designed and tested for application. Should you have any questions, please contact the undersigned at 713) 778-2337. Very truly yours, PETROLEUM The all Division Contracts Engineer PEI/ran 0806R#

Page 3400 7th Street S.W. Washington, D.C. 20590 Attention: The Secretary of Department of Transportation Gentlemen: Subject: Notification Required Under DOT 49CFR Part 195.8 Transportation of Hazardous Material Sohio Petroleum Company plans to initiate crude oil transportation from 5049 in December 1984. • Mississippi Canyon Block 20-A platform to a subsea tie-in in South Pass Block (Proposed Pipeline Route - Attachment 1). The pipeline is a 6" line approximately 54,900 ft. long consisting of two Pag-O-Flex seamless pipe sections. A 1000 ft. section of Pag-0-Flex will extend from the platform riser and a 420 ft. section of Pag-0-Flex will be installed at the subsea tie-in to protect the pipeline from mudflows. The pipeline design criteria is as follows: Design Pressure 1440 psig Operating Pressure 875 psig TEST Working Pressure 2160 psig Design Temperature 115°F Design Flowrate 8000 BOPD The Pag-0-Flex material and testing procedures are described in Attachment 2 hereto. These lines have been specially designed tested for Sohio's application. Should you have any questions, please contact the undersigned at (713) 778-2337. Very truly yours, SOHIO ETROLEUM COMPAN The store dill Pilar Esteve de Iler Division Contracts Engineer PEI/ran 0806R#