W.S.B. & Associates, Inc. (“WSB”) raised its objection to the collective bargaining agreement’s liquidated damages clause for the first time in its motion for summary judgment. Because WSB did not sufficiently present this ground for vacating the arbitration award to the district court, its objection is waived on appeal. See Navajo Nation v. U.S. Forest Serv., 535 F.3d 1058, 1079-80 (9th Cir. 2008) (en banc), cert. denied, — U.S. ---, 129 S.Ct. 2763, 174 L.Ed.2d 270 (2009); Fed.R.Civ.P. 8(a).

AFFIRMED.