Dear Sir or Madam:

Pursuant to Articles 1116, 1117, and 1119 of the North American Free Trade Agreement ("NAFTA"), KBR, 1nc. ("K.Blt") hereby gives written notice of its intention to submit to arbitration a claim against the Govemment of the United Mexican States ("Mexico") on its on behalf and on behalf of its wholly-owned subsidiary Corporación Mexicana de Mantenimiento Integral, S. de R. L. de C.V. ("COMMISA") for breach by Mexico of its obligations under NAFTA Chapter 11 and Article 1503(2).