State flood-control officials gave a green light Monday to a developer's plan to build luxury homes atop a massive new levee in San Joaquin County. The vote by the California Reclamation Board allows the River Islands project in Lathrop to move ahead with the first phase of a development that will eventually include 11,000 homes on Stewart Tract, an island in the Sacramento-San Joaquin Delta. The developer, British-owned Cambay Group, plans to build 224 of those homes on top of a new 300-foot-wide "superlevee" overlooking the San Joaquin River. The Reclamation Board approved an encroachment permit that determines where private...