$111,368 (EECS) or $107,302 (L&S CS) is higher than the median household income of most bay area cities (e.g. $104,552 in San Francisco, $104,324 in San Jose, $68,442 in Oakland*).
So it is hard to believe that a new UCB EECS or L&S CS graduate with typical pay level would find that “it’s virtually impossible for them to survive by base salary alone” when so many households in the bay area live on lower pay levels.