On January 30, 2012, EPA Region 6 issued an administrative complaint and notice of opportunity for a hearing ( Complaint ) under its authority pursuant to the Clean Air Act to NuStar Refining, LLC (NuStar), located in San Antonio, Texas. The Complaint was issued in response to violations of section 112(r)(1) of the Clean Air Act. The Complaint requires NuStar to pay an administrative penalty.