http://www.universityofcalifornia.edu/infocenter/freshman-admissions-summary indicates that fall 2015 frosh applicants to UCs with UC-weighted GPA 3.80-4.19 had these admission rates:
12% UCB
14% UCLA
39% UCSD
49% UCSB
52% UCD
57% UCI
83% UCSC
90% UCR
92% UCM
However, engineering or CS majors tend to be more selective than the campus overall at most UCs. So the admission rate for engineering or CS applicants in that GPA range was likely significantly lower than that of the campus overall. So if a campus appears to be a match for you based on overall admission stats, it is probably really a reach if you apply for engineering or CS.