A New City teen will spend up to four years in state prison after pleading guilty yesterday to driving while intoxicated, killing 16 year-old Clarkstown North High School student, Vlad Hvalyk, and injuring a 17 year-old girl, both passengers in his car. Rockland County District Attorney Tom Walsh says 18 year-old Alan Mendoza pleaded guilty yesterday to aggravated vehicular homicide. The incident occurred on May 6th. Walsh says Mendoza struck two other vehicles after crossing over a double-yellow line, and then struck a tree on Congers Road. Mendoza is expected to get 1 and 1/3 to four years in state prison when he is sentenced next May.