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 under the following conditions and for the periods, as follows: (

a) Upon a conviction or finding of an offense under subdivision (

b) of

Section 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 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.