Final Answer:
When locating a 6" PE or steel pipe (service or main), all of the listed markings are required, except the manufacturing date.
Step-by-step explanation:
When identifying and marking a 6" PE (Polyethylene) or steel pipe, various information is essential for accurate location. This includes the type of pipe, size (6"), depth, and the material it is made of (PE or steel). Additionally, markings indicating the presence of utilities and their ownership are crucial. However, the manufacturing date may not be a required marking for the purpose of pipe location. The manufacturing date is pertinent for quality control and maintenance but may not directly impact the identification and mapping of the pipe during the location process.