4 or 5 years University to become a surveyor.
Are you looking at locations or depths/levels only?
What sort of equipment are you using?
Are you working off a plan?
Normally for a pit/manhole You provide a pair of hurdles & the depth below them required.
You probably have some local code for clearances around the utilities.

__________________
Grumpy Old Diesel Owners Club group

I no longer question authority, I annoy authority. More effect, less effort....

1967 230-6 auto parts car. rust bucket.
1980 300D now parts car 800k miles
1984 300D 500k miles
1987 250td 160k miles English import
2001 jeep turbo diesel 130k miles
1998 jeep tdi ~ followed me home. Needs a turbo.
1968 Ford F750 truck. 6-354 diesel conversion.
Other toys ~J.D.,Cat & GM ~ mainly earth moving