INDIANAPOLIS -- Almost as quickly as Lucas Oil Stadium rose on the Indianapolis skyline, the RCA Dome is about to vanish.

With Lucas Oil Stadium up and running with few issues, work on the demolition of the RCA Dome is accelerating.

Workers had already ripped out part of the field. On Thursday, half of the yard markers had been taken out and workers were busy tearing the AFC logo from the west end zone.

Those portions and the Colts helmet at the 50-yard line have been sold online as souvenirs, but the unmarked parts of the field that weren't sold will be shredded, 6News' Norman Cox reported.

"They're taking enough to reach the sales that they produced," said Tom Scheele, of Shiel Sexton, a construction company. "Nobody wanted the rest."

Seats are being unbolted, some individually and some in sections or rows. Some of those are also being sold as memorabilia. Others will be donated to youth ballparks.

The roof is scheduled to come down around the third week of September, depending upon what's going on nearby.

"We want to be respectful of events inside the convention center. For example, if we were lowering the roof … today and there were an event over there, I'm betting the people would probably want to walk out of their event, come over and watch the roof," Scheele said. "What we're trying to do is get a sense of what's going on in the city over those two weeks."

The demolition will cease, for the most part, during Colts games and other big downtown events.

Once the roof is down, the next step is the implosion of the upper sections of the building. That is set to happen in December.

All of the rubble is expected to be hauled away next spring. Construction managers hope to have enough cleared to begin building the new convention center expansion by late January.