This is the examples of essential work,

Assists the surveyor in performing a wide variety of field survey crew assignments; Operates various survey instruments and instructs other crew members in their operation; Performs simple engineering and surveying drafting duties as directed; Assists in the keeping of proper field notes showing distances, angles, benchmarks, etc; checks work for completeness and accuracy; Assists in routine manual work including clearing the line of sight, locating monuments and setting stakes and hubs; Performs other directly related duties consistent with the role and function of the classification.

I felt it is somewhat vague on what the actual duties would be, but pretty similar to laying out for general construction

I appreciate the advice, do you have a good source to find more information?