Like a lot of longtime employees at Waco Inc., a 400employee Henrico County construction firm, Sandra Lee Denis was considered beyond reproach. “She was a 22-year employee. Long-term like a lot of people here. We’re like family,“ said secretary-treasurer Jim Foege. The company operates throughout the mid-Atlantic states. Denis, 51, was in charge of accounts payable and kept tabs on about 50 employees who use company credit cards.