Chicago ? A Cook County judge is recommending six months at boot camp for the 16-year-old boy who rushed the field with his father and beat Kansas City Royals base coach Tom Gamboa when the Royals played at Chicago last September.

Markham Juvenile Court Judge Michael Stuttley considered a parole violation and a July 2002 juvenile delinquency petition in recommending the sentence Wednesday, said Tom Stanton, a spokesman for the Cook County state’s attorney’s office.

The Illinois Department of Corrections Juvenile Division will decide whether to accept the recommendation. Otherwise officials could keep him at a juvenile detention facility until his scheduled return for a court review June 2, 2004, Stanton said.

The boy’s father, 35-year-old William Ligue Jr. of Alsip, last month pleaded guilty to two counts of aggravated battery and is to be sentenced June 18. The boy pleaded guilty last year and was sentenced to five years of probation.

In April, prosecutors alleged a probation violation.

“He was in a residential drug treatment center and he chose to leave that facility,” Stanton said.

The judge also considered a delinquency petition regarding a July 2002 Blue Island restaurant burglary, Stanton said. That charge had not been forwarded to the court before the boy’s original sentence.

Boot camp detainees undergo physical training, counseling and education.

The Chicago City Council on Wednesday also approved a $1,000 fine for anyone running onto restricted areas at stadiums and other sports venues. Offenders having physical contact with players or umpires would face up to six months in jail.