Asphalt repair on Hill Street

Why did they repair the asphalt on Hill Street and the top of Costilla Street, and then tear it out only a few days later to repave the whole street?

The observations you made about this project are correct. Prior to street milling and paving work, contractor crews complete concrete and utility work to prepare the street for the final overlay. Work within the street is often patched over for safety purposes and to protect cars from exposed work, even if additional work is to completed soon after. The repairs contribute to the materials that are recovered and reused when rebuilding a street, so no material goes to waste even if used in a patch.