This means that you may get into the school, but then face a competitive secondary admission process to get into the CS major. It is better to apply to the CS major so that you may be admitted directly to the major and not have to earn a 4.0 or other high GPA to get into the major later.
If your UC/CSU weighted GPA is >= 3.0 as a California resident, then you should be admitted as a CS major to non-impacted CSU campuses where CS is not an impacted major. These are CSUB, CSUCI, CSUDH, CSUEB, and CSUStan. See http://www.calstate.edu/sas/impactioninfo.shtml .