I agree with Tesla; the POCO Representative is Yankin' your Chain (or does not have sufficient experience, to be in the position of Compliance Quoting).
All Utility-Related installs - which in the case for Bwise121's Project will include Secondary Ducts, Secondary Feeder Conductors, and Service Equipment; shall be Compliant to the Specifications and Requirements of the Governing Utility.
The Representative passed on incorrect and false information, in regards to Compliance, and did not mention the Inspections will be performed by the POCO Field Inspection Department - and the DBS needs to Sign-Off the Service Equipment before the Meter Shop may mount the KWH Meter.
DBS (Department of Building & Safety) may request Underground Inspection, in addition to the Utility (POCO).
The Utility _Should Have_ their ESR Manual (Electrical Service Requirements) available On-Line; which may be used to interpret the Specs' that will be presented to you.
You should make arrangements to visit the POCO's Service Design / Engineering Office, to begin the new Service Processes.
The Service Planner assigned to your Project will quote the basic Requirements, Quantities, Materials & Equipment Specifications, Documentation required (Plans, Load calculations, Cut-Sheets, Internal Forms, Permits, Easement Drawings, etc.), along with most important of all: the Fee Schedule!
Further, double check to see if three phase power is at the street.
It would cut down on your conductor sizing, no doubt.
A request for Three Phase 4 Wire Service would be cool for this Project, as the long Feeder length and Customer Usage (Work Shop) could benefit from a Polyphase System.
Good luck with this Service Request!
Inform us of the progress (or regress...).