Top executives of El Camino Hospital could see their compensation slashed by tens of thousands of dollars if South Bay voters approve a measure backed by an employees union. The El Camino initiative, which has received enough signatures to qualify for the ballot, would limit the compensation of executives, managers and administrators at the hospital and the district to twice the annual salary of the governor of California, which is currently $174,000. The union representing some of the hospital's lowest-paid workers, the Service Employees International Union United Healthcare Workers West, began the initiative drive earlier this year. The measure qualified for the ballot in April, according to the Santa Clara County Registrar of Voters.