A blood test in Riverside is done by an outside lab. This is mostly to your benefit - as many of the attorneys here on Avvo have commented: the criminal justice system is overwhelmed, and that includes the outside labs that are contracted to do blood tests.
Think of it as "triage" - too many cases, not enough prosecutors and courts = move the cases through quicker. But that means having to make deals, big deals. And, the "stickier" a case becomes, the more likely it is to get a deal.
You should definitely investigate retaining an experienced DUI attorney on this matter. You're going to want someone who understands blood testing (usually done by GCHS) and can properly attack the validity of the BAC result based upon the lack of a amphetamine / metabolite spike.
Yes, you'll have to push the matter toward trial (and possibly even go to trial) in order to bring to bear the pressure needed to achieve the settlement you're after. (Absent some astounding finding or admission of error/mistake, you probably won't get a dismissal from the DA. If that's what you're after, then you're probably going to have to get it from the jury.) But again, that's the way the system currently works. Think: "Squeaky wheel gets the grease."
If you already have an attorney, then he/she should be working on this for you. And, if he/she needs assistance, there are plenty of peers who be happy to lend some advice. If you don't have an attorney, then you should start interviewing qualified DUI attorneys immediately.
Good luck (and congrats on your upcoming graduation.)