You need to win your APS hearing at the DMV in addition to reducing the case to a "wet" at court. If you get both, you won't get suspended. Consult a DUI attorney to respresent you ASAP so you can request the hearing within 10 days of your arrest.
In Orange County, several DA's (assistant DA's) are assigned to handle misdemeanor pre-trials. No one is specifically tasked to handle your case. Once your pre-trial conference happens, any of them could handle your matter. Not until trial is someone personally responsible for your case.