Region 8

Notice of Intent to Approve an Aquifer Exemption for the Big Bend 1-5 SWD

UIC Permit No. ND22184-08837

EPA is proposing to approve a Major Modification and a request from Slawson Exploration CO, INC. for an Underground Injection Control Program Class II commercial injection well aquifer exemption for the disposal of produced water at the Big Bend 1-5 SWD commercial injection well. The proposed Major Modification would correct the depth for the Inyan Kara Formation. The total dissolved solids (TDS) of the Inyan Kara Formation was found to be a range from 6,510 to 9,170 mg/L after 715 swab volumes (bbls).  The well is located on the New Town peninsula area which is located south of New Town, ND.

Currently, there are no disposal wells located on the New Town peninsula and Slawson’s closest disposal well to the area is approximately 12 miles northeast, necessitating truck hauling traffic to travel through the east side of New Town, ND.  The majority of the water will be pipelined to the Big Bend 1-5 SWD, with the remaining water trucked.  This commercial injection well will help reduce truck traffic, decreasing emission pollution and increasing road safety.

Fluids proposed to be injected would come from liquid waste generated by the Bakken and Three Forks production wells.   Both the Bakken and Three Forks Formation waters contain high concentrations of chlorides, sodium and some calcium, making the physical characteristics of the two waters very similar with total dissolved solids (TDS) up to 344,000 PPM in this area as published in the Catalog of North Dakota Water Chemistries.  These waters have no secondary use and can be disposed of in Class II wells. Permitted wastes also include fluids produced during the drilling, completion, testing, or stimulation of wells or test holes related to oil and gas operations. 

View documents below that pertain to this application.

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