This is a municipally powered metro — the utility serving it is one of the largest public power companies in the country — and its standards govern feeder and duct-bank work across the service territory. We bore to those standards: cover, separation, spacing, and submittal-ready bore plans that don't bounce.
The engineering flavor is rock: north-side feeder routes drill limestone more often than not, which changes tooling, pace, and the entry/exit plan. Karst adds its own item — a void encountered mid-bore is a procedure, not a panic, and our recharge-zone bore plans carry it in writing.
Military installations and the growing manufacturing base on the metro's edges add owner-permit layers to the usual stack; we scope site-specific requirements at the desk so mobilization day is a drilling day.