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SWG-2018-00253 - Transcontinental Gas Pipeline Company, LLC - Gulf of Mexico - Jefferson County, Texas

Published May 23, 2019
Expiration date: 6/24/2019
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Full Public Notice          Proposed Plans

PROJECT DESCRIPTION:  The applicant proposes to decommission-in-place 8.73 miles of existing 20-inch natural gas pipeline, segment number 5451 and 2.30 miles of existing 12-inch natural gas pipeline, segment number 5452.  These pipelines are currently in areas expressing water depths of approximately 200 feet and greater.  They were previously authorized via Department of the Army Permit 13732.  Approximately 0.26 acre (422.02 cubic yards) of continental shelf will be temporarily impacted so that the pipeline can be cut, flushed, and capped.  The applicant states that due to the depth of the pipeline, removal would cause significant disturbance and ecological damage to the sea bottom and removal of the line introduces unnecessary safety risks to the dive and removal crew.

 

In accordance with the Bureau of Safety and Environmental Enforcement 30 CFR 250.1750 pipeline decommissioning requirements, the applicant proposes to:  1. Disconnect from previously serviced platform and subsea tie-in connection; 2. Flush by pigging, and filling with seawater to equalize the line pressure; 3. Plug each end of the pipeline; and 4. Confirm depth of cover at the pipeline ends, and cover endpoints with protective concrete mats.