Utility sink close to 220v dryer outlet

There are several things you can do:

• Pictures, with clear reference points (eg, natural features of the land such as rock cuts, streams, as well as man-made structures).

• Drawings using graph paper, and with GPS marking locations

• For non-metallic water pipes (anything without a metal wire in it), bury a metal wire alongside (really, any kind of continuous wire will do). This will allow you to use an inductive cable locater to trace that line later. There are also some newer RFID-based tags you can get that specifically indicate types of cable/pipe (power, water, waste, gas, telephone, etc), and can be read by a special receiver.

Inductive cable locator:

That's a drum trap, not a P-Trap. Be sure it's listed to comply with your code requirements. Looks slick anyway. You'll need a 45 degree chrome compression ell and maybe some extra pipe. You'll end up with the trap arm out of the drum running at a 45 degree horizontal angle to the wall. It will be cut quite short before it enters the ell. Upon exiting the ell, it should be a straight shot to the wall connection. The remaining trap arm you cut off may or may not be long enough for this. It then ties into the wall pipe with the same adapter fitting you would normally have used.

The trap arm runs entirely horizontal, despite the ell, with just enough slope to drain (1/4" per foot). The only significant vertical drop is in the tail piece that drops straight down from the sink. If you prefer the 45 degree segment to be closer to the wall, you could do a variation using two 45 degree ells, such that the trap arm out of the drum goes straight back for a distance before making a dog leg to the wall drain.