Is it possible to get into UC?

Im just wondering. But lets say is it possible to get into a UC like Irvine, San Diego, Santa Barbara, Merced, etc. But not UC berkeley or los angeles, with an overall gpa of 2.8-3.0 and have over 50+ hours of community service? If you have overall gpa of 2.8-3.0 and UC requirement is 3.0 around how many community hours should you do in order to replace ur gpa with community service hours. Thanks.