A schematic diagram of the peanut butter pumping machine. b. Locations of
environmental samples taken from the machine. 1. Exit piping; 2. Upper elbow; 3. Left
elbow of lower pipe, left of positive displacement pump; 4. Right side of lower pipe,
immediately before positive displacement pump; 5. Lower pipe, immediately after
positive displacement pump; 6. Bottom exit of T2; 7. Bottom exit of T1.