California Forever announced today that the group has collected 20,472 petition signatures for their initiative that would change Solano County zoning laws to accommodate a new city of 400,000 people between Fairfield and Rio Vista. The Silicon Valley billionaire-funded development group turned the signatures in to the Solano County Registrar of Voters on Tuesday, according to county records. … Opponents of the project have raised concerns about additional traffic that the project will add to the highways, the potential for the development to interfere with the training and other operations at Travis Air Force Base and where the development is going to source its water.