Veh. Code, § 13355

The department shall immediately suspend the privilege of any person to operate a motor vehicle upon receipt of a duly certified abstract of the record of any court showing that the person has been convicted of a violation of subdivision (b) of Section 22348, or upon a receipt of a report of a judge of a juvenile court, a juvenile hearing officer, or a referee of a juvenile court showing that the person has been found to have committed a violation of subdivision (b) of Section 22348 under the following conditions and for the periods, as follows:

(a) Upon a conviction or finding of an offense under subdivision (b) of Section 22348 that occurred within three years of a prior offense resulting in a conviction of an offense under subdivision (b) of Section 22348, the privilege shall be suspended for a period of six months, or the privilege shall be restricted for six months to necessary travel to and from the person’s place of employment and, if driving a motor vehicle is necessary to perform the duties of the person’s employment, restricted to driving within the person’s scope of employment.

(b) Upon a conviction or finding of an offense under subdivision (b) of Section 22348 that occurred within five years of two or more prior offenses resulting in convictions of offenses under subdivision (b) of Section 22348, the privilege shall be suspended for a period of one year, or the privilege shall be restricted for one year to necessary travel to and from the person’s place of employment and, if driving a motor vehicle is necessary to perform the duties of the person’s employment, restricted to driving within the person’s scope of employment.