Another misuse of the word "tarmac". In fact it's actually "Tarmac" (upper-case T), which is a registered trademark for a certain brand of road-surfacing material. It is NOT just a generic airport area where airplanes park. The proper term is "ramp". How do they know the DIA ramp area used Tarmac brand surfacing material during construction?

Tarmac
[tahr-mak] 

Trademark.
1.
a brand of bituminous binder, similar to tarmacadam, for surfacing roads, airport runways, parking areas, etc.