CA Gov't Code Section 66499.23

The petition shall be accompanied by a new map showing the boundaries of the subdivision as it appears after the exclusion and alteration. The new map shall designate as numbered or lettered parcels those portions excluded and show the acreage of each parcel. If the map can be compiled from data available, an actual field survey shall not be required. If the map meets with the approval of the county surveyor, a statement by an engineer or surveyor shall not be required.