BRIDGE GRADE STAKES.— Elevations are taken from bench marks set in, or near, the

construction area. Consider permanency, accessibil-ity, and convenience when setting bench marks. Set grade stakes for a bridge site in the same manner as the grade stakes on any route survey. Make sure that the senior petty officer in charge of the job has suf-ficient information so that the exact method being used to designate the grade can be understood.