A food handler walked to the ingredient prep area in the back of the gourmet sandwich shop where he worked. He was shocked to see a small puddle of sewage that had formed around a floor drain. He watched the drain​ closely, but nothing else backed up. He quickly told a manager who evaluated the situation. Because it appeared the sewage had not contaminated food or​ equipment, the manager decided to remain open.​ However, no new sandwich ingredients were prepared. Instead the shop sold sandwiches made from remaining ingredients. When they had used these​ up, they sold premade sandwiches from the display case. The manager assigned one of the staff members to clean up the spill. She then contacted the building​ management, who quickly sent out a licensed plumber?