Patrons reported a male, Gregory Piere (56 years old), had thrown his bike on to the track way at the 16th Street BART Station and then jumped down onto the tracks. Piere left the station prior to the officers arriving and went to the plaza on the street level. Paramedics arrived to assist Piere, however he became upset and agitated. When officers tried to speak with Piere he began acting erractic and a struggle ensued. Piere was arrested for public intoxication, battery on an officer and resisting arrest. Piere was also issued a prohibition order. TSOC was notified.