PER CURIAM. Herson Castaneda (Castaneda) pled guilty to aiding and abetting the fraudulent misuse of identification documents, in violation of 18 U.S.C. §§ 1546(
a) and 2. The district court granted, in part, Castaneda’s motion for a downward departure, reducing his total offense level by 2 levels and arriving at a Guidelines imprisonment range of 18-24 months. The court then sentenced him to 18 months imprisonment and 3 years supervised release. Castaneda appeals, arguing his sentence is excessive. Castaneda’s challenge to the extent of the downward departure is unreviewable, see United States v.
Puckett, 147 F.3d 765, 772 (8th Cir.1998), as is the district court’s refusal to depart on the proffered ground that the case was outside the heartland of cases, see United States v. Riza, 267 F.3d 757, 758-59 (8th Cir.2001) (district court’s decision not to depart downward is unreviewable so long as court was aware of its authority to depart; court is presumed to be aware of scope of ability to depart downward). Castaneda does not otherwise argue his sentence was imposed in violation of law; and the sentence fell within the applicable Guidelines range, which did not span more than 24 months. See United States v.
Woodrum, 959 F.2d 100, 101 (8th Cir.1992) (per curiam). Accordingly, the appeal is dismissed. . The Honorable Richard G. Kopf, Chief Judge, United States District Court for the District of Nebraska.