May 11, 2007 Sterling Group Partners II, L.P. Sterling Group Partners II (Parallel), L.P. 8 Greenway Plaza, Ste. 702 Houston, Texas 77046 Gentlemen: Reference is made to that certain letter agreement, dated as of March 27, 2007 (the "Sterling...Sterling Commitment Letter • May 15th, 2007 • Crane James R • Arrangement of transportation of freight & cargo
