With less than four months left until a critical deadline when the Salton Sea will begin to shrink rapidly, residents and activists are pressing for California officials to secure funding and act quickly to avert a costly disaster. Some people who live around the lake are driving to Sacramento for a Thursday meeting of the State Water Resources Control Board, which is considering an agreement between several agencies that would commit state officials to following through with pledges of building thousands of acres of ponds, wetlands and other dust-control projects around the lake over the next 10 years.