Specifications 1940-76 (with omissions). 1954. Protective mat for dike no. 1, station 5140-50 to station 5150-00, embankment and protective mats for dike no. 1, station 5150-00 to end and dike no. 2, Coachella Valley flood protection, All-American Canal system, Boulder Canyon project, Ariz.-Calif.-Nev.