6.50% Uses in Modification of Section 1.5(a Clause

Modification of Section 1.5(a from Amendment to Credit Agreement

THIS SECOND AMENDMENT TO CREDIT AGREEMENT (Amendment) is entered into as of August 29, 2005, by and among (a) (i) OMNI ENERGY SERVICES CORP., a Louisiana corporation (Omni), and (ii) TRUSSCO, INC., a Louisiana corporation (Trussco, Omni and Trussco are hereinafter sometimes referred to individually or collectively as Borrower or Borrowers), (b) (i) OMNI ENERGY SERVICES CORP.-MEXICO, a Louisiana corporation (Mexico), (ii) OMNI PROPERTIES CORP, a Louisiana corporation (Omni Properties), (iii) OMNI OFFSHORE AVIATION CORP., a Louisiana corporation (Offshore Aviation), (iv) OMNI SEISMIC AVIATION CORP., a Louisiana corporation (Seismic Aviation), (v) OMNI ENERGY SEISMIC SERVICES CORP., a Louisiana corporation (Seismic Services), (vi) TRUSSCO PROPERTIES, L.L.C., a Louisiana limited liability company (Trussco Properties), and (vii) AMERICAN HELICOPTERS INC., a Texas corporation (American; Mexico, Omni Properties, Offshore Aviation, Seismic Aviation, Seismic Services, Trussco Properties and Ame

Modification of Section 1.5(a. The second sentence in Section 1.5(a) is hereby modified to read as follows: As of the Closing Date, the Applicable LIBOR Margin (such margin will be referred to as the Base LIBOR Margin) shall be 6.50%.