We explain the difference between challenges to arbitral awards on substantive grounds, procedural grounds and jurisdictional grounds. The Federal Arbitration Act.("FAA") and some state laws provide the reasons why an award can be vacated (thrown out), modified (changed), or corrected. Procedures and Grounds for Requesting a U.S. District Court to Correct an Arbitration Award or Vacate an Arbitration Award Under the Federal Arbitration Act.