First off, y'all gotta learn how to spell the school, it is Berkeley, there are 3 "e's" in the word.
Second, the guy who wrote you must be getting into some of that 'medical marijuana' we have in CA. The average GPA at Cal is 4.15 and 4.16 at UCLA, a low 3 would never cut it, the only UC schools where the GPA is lower than 4.0 are UC Merced, UC Riverside and UC Santa Cruz (who wants to be a Banana Slug anyways??). The 75th percentile at Berkeley have 710, 750 and 710 for their SAT's (reading, math, writing) and UCLA is 680, 730, 690, so pretty competitive.
A person with 3.1 GPA and with SAT's of like 550, 590, 570 would wind up at a Cal State Uni like Cal Poly Pomona, SLO or SF State, someplace like that unless they are a star athlete.
Like I said, I know of two guys who had over 4.0's and good SAT's who didn't get into Cal, but one did get into UCLA the other wound up at UCSD.