SAN PABLO, Calif. (AP) — The only statewide measure on the March 3 ballot is Proposition 13, a $15 billion bond to build, repair and modernize schools in California. If voters approve it, $9 billion would go to K-12 schools. The priority is on health and safety concerns, including earthquake risks, and removing toxic mold and asbestos from aging classrooms and lead from drinking water. The rest would go to public universities and community colleges. Teachers unions, doctors and firefighters are among the backers. The main opposition comes from the Howard Jarvis Taxpayers' Association, which says the state should use its budget surplus to pay for school improvements rather than borrow the money.