West Contra Costa school district workers have a perk that many employers no longer offer: lifetime retiree health benefits. But that comes at a high cost to the district: an estimated $495 million, which covers benefits for all currently eligible employees and their spouses and amounts to almost twice the district's annual operating budget. According to a recent study on the issue presented to the school board this week, the estimated cost will grow to $727 million once currently ineligible employees become eligible. District officials, who have been aware of the swelling liability for years, cover the cost on a...