The Claimants, Mr Robert Azinian of Los Angeles, California, Mr Kenneth Davitian of Burbank, California, and Ms Ellen Baca of Sherman Oaks, California, have initiated these proceedings as United States (hereinafter “U.S.”) citizens and shareholders of a Mexican corporate entity named Desechos Solidos de Naucalpan S.A. de C.V. (hereinafter “DESONA”). DESONA was the holder of a concession contract entered into on 15 November 1993 (hereinafter “the Concession Contract”) relating to waste collection and disposal in the city of Naucalpan de Juarez.