SACRAMENTO, Calif. (AP) — A building contractor from San Diego faces up to 20 years in federal prison after pleading guilty to defrauding a casino-operating Indian tribe in Northern California of more than $17 million through a kickback scheme.

Federal prosecutors say 54-year-old Bart Wayne Volen acknowledged during a court hearing Thursday to conspiring to commit mail and wire fraud, conspiring to launder money and filing a false tax return.

Volen, who also has a home in Haiku, Hawaii, was charged in the construction-fraud case along with two former employees of the United Auburn Indian Community.

The tribe's former administrator, Greg Scott Baker of Newcastle, and the tribe's former quality-control expert, Darrell Patrick Hinz of Cameron Park, are awaiting trial in October.

The tribe operates Thunder Valley Casino in Lincoln, a suburb of Sacramento.