California officials tried to smooth the way for the Delta tunnels project by slicing it in half. Instead they’re facing more pushback and the possibility of additional delays. One day after Gov. Jerry Brown’s administration downsized the Delta tunnels project, a host of project opponents tried Thursday to halt a state regulatory hearing that’s crucial to getting it built. They argued that Brown’s decision, after a decade of planning, creates such a monumental change that they need time to analyze the potential impacts on fish, agriculture and the rest of the Delta’s troubled ecosystem.