WAIVER AND FIFTH AMENDMENT TO AMENDED AND RESTATED CREDIT AGREEMENT among GASTAR EXPLORATION USA, INC. THE GUARANTORS SIGNATORY HERETO THE LENDERS SIGNATORY HERETO and AMEGY BANK NATIONAL ASSOCIATION, as Administrative Agent Effective March 6, 2013Credit Agreement • March 11th, 2013 • Gastar Exploration USA, Inc. • Crude petroleum & natural gas • Texas
