The basic pay ranges established under §§ 9701.321 through 9701.323 may be supplemented in appropriate circumstances by locality or special rate supplements, as described in §§ 9701.332 through 9701.335 . These supplements are expressed as a percentage of basic pay and are set and adjusted as described in § 9701.334 . As authorized by § 9701.356 , DHS implementing directives will determine the extent to which §§ 9701.331 through 9701.337 apply to employees receiving a retained rate.
5 C.F.R. §9701.331