Commercial - Sanitary tie-in

[twest]

For design purposes we need to know the size and location of sanitary tie-ins at a commercial property, but construction drawings are not available for the space.

There are several clean-outs / drains inside, and man-holes outside, although man-holes may or may not have "sewer" stamped on them (grease traps?).

So is there a way to know for sure the size of the line and where it exits the space?

(And how can I distinguish the grease trap?)

[phishfood]

This sounds like it might be a job for a sewer camera with a locator feature.

[Mr_David]

Open it and look.