Site plans sit in the civil set, and sometimes in the architectural set. Civil sheets use an engineering scale, such as 1 in equals 20 ft.
A paving sub measures asphalt and concrete areas from it. A fencing sub measures linear feet of fence and counts gates. A landscaper counts trees.
Check the scale on each sheet before you measure. Find the limits of construction line. Work outside that line is usually not in the contract.
Look for staging areas and access points too. They affect how you move material on the job.