If they admitted you knowing what your GPA already looked like then I don’t think you need to worry. If you go to a CCC i am fairly certain that only your best attempt at a class is placed in your GPA, so you can potentially bring up your GPA and get the ‘ghost’ of that class of your GPA. I was also admitted to UCSC, I believe they explicitly state what GPA they expect although I cannot recall it at the moment I expect it’s about 3.0? I would look in your packet if I were you.
If you’re still concerned, just call them and tell them your situation and they should be able to help you.