Dear Sir or Madam:

We represent KBR, Inc. ("KBR") an " investor of a Party," in its claim against the Government of the United Mexican States ("Mexico") on its own behalf and on behalf of its wholly-owned subsidiary Corporaci6n Mexicana de Mantenimiento Integral, S. de R.L. de C.V. ("COMMISA") for breach by Mexico of its obligations under the North American Free Trade Agreement ("NAFT A") Chapter 11 and Article 1503(2).

Pursuant to Articles 1116 and 1120 of the NAFTA and Article 3 of the 20 10 UNCITRAL Arbitration Rules, KBR hereby submits a claim to arbitration against Mexico under Chapter 11 of the NAFTA and the UNCITRAL Arbitration Rules. Please find below our submission in the form of a notice of arbitration, as provided in Article 3 of the UNCITRAL Arbitration Rules modified by Section B of Chapter 11 ("Notice of Submission to Arbitration").