Announcing examinations for engineer, $3,100 and $3,825 a year (grades GS-5 and GS-7), options, GS-5, civil, GS-7; civil, construction, hydraulic, materials, safety, and structural, civil engineer (trainee), $2,650 and $2,875 a year (grades GS-3 and GS-4), announcement 13-1-6 (1949).