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SWG-2017-00254 - Targa Downstream LLC - wetlands and unnamed tributary to Cedar Bayou - Galveston County, Texas

Published April 19, 2018
Expiration date: 5/21/2018
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Full Public Notice          Proposed Project Plans          Draft Mitigation Plan

PROJECT DESCRIPTION:  The applicant proposes to permanently fill 31.74 acres of mosaic palustrine forested (PFO) wetlands on a 134-acre tract to construct four new brine ponds for brine water storage, two new stormwater detention ponds and associated rip-rap outfalls, and 12-foot-wide and 16-foot-wide maintenance roads located along the perimeter and in between the proposed brine ponds and stormwater detention ponds.  The brine ponds would provide additional brine storage capacity needed to support the applicant’s underground product storage wells and brine injection wells.  The storage of natural gas liquids (NGLs) in the Mont Belvieu salt dome storage complex requires the use of brine which is injected or removed from the underground sites to control the flow of NGL into and out of underground storage facilities.  As such, above-ground containment ponds are required for the storage of brine as part of the NGL storage process.  The ponds will consist of elevated berms ranging from 25 to 26 feet above grade and will be lined with layers of high density polyethylene geomembrane.  Brine Pond No. 6 will measure approximately 18 acres; Brine Pond No. 7, 17 acres; Brine Pond No. 8, 20 acres; and Brine Pond No. 9, 18 acres.  The stormwater detention ponds will serve as mitigation for floodplain capacity, with capacities of 45.2 acre-feet and 81.8 acre-feet of water.  Construction is anticipated to begin in August 2018 and to take approximately 5 months to complete.