(Portland, OR)  --  A TriMet bus driver is facing charges for allegedly drinking on the job.  Gresham police arrested 55-year-old Lamont Biggs just after midnight yesterday on DUII charges.  Police say an officer pulled Biggs over after seeing him speeding in his number 20 TriMet bus on Southeast Stark Street.  Only one passenger was on the bus at the time of the arrest.