Residents and environmental activists continue to scrutinize the Santa Clara Valley Water District\u2019s plans to expand a regional dam. Valley Water employees presented updates and fielded questions about the controversial Pacheco Dam expansion \u2014 including questions about costs. The project\u2019s estimated cost is $2.78 billion, but factoring financing and other contingencies could escalate the price tag to $5.5 billion. The Valley Water board of directors is slated to receive a more in-depth series of presentations in the coming months before making a final decision. The water district wants to expand Pacheco Dam\u2019s reservoir capacity from 5,500-acre feet of water to…<\/p>\n