Sebastopol police arrested two drunk drivers with high blood-alcohol levels on Friday, including a hit-and-run driver whose blood alcohol content was more than three times the legal limit.

The arrests came one day before Halloween festivities and some Sonoma County law enforcement officials said Saturday that they're prepared to encounter revelers who drive drunk tonight.

In the first incident Friday, police officers were dispatched at noon to Gravenstein Highway North and Hurlbut Avenue, on a report of a hit and run collision. An eye witness said a man in a green Toyota Tundra rear-ended another vehicle that was stopped at a red light.

Police said the suspect, 30-year-old Brett Terrance Callaway, fled the scene, but a witness provided officers with a description of his vehicle, including a license plate number. Officers located Callaway at his Sebastopol address, where his Tundra was parked out front.

The pickup truck had fresh damage consistent with the reported collision, police said. Officers determined that he was driving under the influence of alcohol. His blood alcohol content, or BAC, was 0.26 an hour after the collision.

Later that evening, at 9:34 p.m., officers were dispatched to the CVS Pharmacy on Gravenstein Highway North on a report of four drunk people causing a disturbance. When Officers arrived at the scene, the suspects fled in a red Nissan Sentra.

A police officer conducted a traffic stop and arrested 45-year-old Michael Scott Marshal of Sebastopol for driving under the influence of alcohol, driving on a suspended license and violation of court probation. Marshal, who was booked into Sonoma County jail, will also be charged with being a driver in possession of marijuana.

Marshal had a BAC of about 0.17, more than twice the legal limit of 0.08. Three others in the vehicle were arrested, two of them on charges of being drunk in public and possession of marijuana.

Sebastopol Police Sgt. Mike Nielsen said extra officers will be patrolling the streets tonight, looking for Halloween disturbances and drunk drivers.

Nielsen said that drivers should be aware of what they're drinking, in some cases more so than how much.

"We're always on the look out for DUIs," he said. "What most people don't realize is how easy it is to be DUI. It sometimes depends on the type of alcoholic beverage."

Nielsen said a domestic beer, for example, doesn't have as much alcohol content as a stout beer.

"It's not quantity but quality," he said.

Sgt. Jeff Abrams of the California Highway Patrol in Santa Rosa said Halloween is usually a busy night for CHP officers.

"A lot of people in costume go to jail," he said.

Lt. Scott Dunn of the Sonoma County Sheriff's Department said there won't be any extra deputies on patrol. But he said the department will keep a "high presence" in the community, with an eye out for all kinds of "situations" that may occur.