As one participant suggested at the Carson Valley Chamber of Commerce Business Showcase last week, the arrival of Walmart in south Gardnerville is a black cloud hanging over the local business community. No one knows if it will rain or snow, or if they even want the weather."I don't know what Walmart will do to the area," said Gardnerville resident Chuck Lacugna. "I think it could hurt small business.""It's scary," said wife Darlene Lacugna. "It's convenient for us, because we shop at Walmart, but we also don't want to see other businesses fold up."Asked if they would make an effort …