The police chief says it's believed the officer committed the crimes while on duty and used his position to stop and assault the victims.
"Personally, I'm appalled and sickened that someone who is put in a position of trust would violate that trust in such an egregious and despicable manner," Police Chief Dan Drummond said.
Another officer reported the alleged crimes.
Alvarez was placed on administrative leave and booked into the Yolo County Jail.
