By Dan Levine SAN JOSE Calif. (Reuters) – A U.S. judge on Thursday said she had concerns about approving a $324.5 million settlement involving Apple, Google and two other tech companies in a lawsuit accusing them of conspiring to avoid poaching each others workers. Tech employees filed a class action lawsuit against Apple Inc AAPL.O, Google Inc GOOGL.O, Intel Inc INTC.O and Adobe Systems Inc ADBE.O in 2011. The case has been closely watched due to the potentially high damages award and the opportunity to peek into the world of Silicon Valleys elite. U.S. District Judge Lucy Koh in San Jose, California must approve the deal.