The agency says travelers should expect 10-minute delays in both directions until 4 p.m.
Caltrans wants drivers expect significant delays on their commute through the construction zone.
Roadway excavation and potholing for underground construction will start at The Alameda, and continuing in an eastbound direction.
Caltrans ready to start advertising for construction bids.
Caltrans to request funding from state transportation commission in December, with two-year construction phase expected to begin next summer.
Caltrans attributes holdup to right-of-way acquisition and utility relocation agreements.