Volta to discontinue lunch serviceThe bar at Volta. Photo: Paul Chinn/The Chronicle Following a little more than eight months of business, Volta is switching up its hours of operations. The Scandinavian/French follow-up to Perbacco and Barbacco will be discontinuing lunch service at the end of this week (Sept. 2). Dinner and weekend brunch hours will remain unchanged. But you’ve got two more days to pop in for a weekday lunch. The restaurant, which has gotten positive reviews for both its food and its aquavit, will make the change for now, but it will likely bring back lunch service for the convention and holiday seasons later this year. “We gave it a solid