Did you read the article? Here, I will cut and paste the part you need to read that explains ain't nobody blasting no granite boulders for free.
"When the project began, geologic surveys suggested about 30 percent of the material underground would be granite. It turned out to be about 45 percent, resulting in greater costs for excavation.
"The people that have been working on this project have been highly professional people," Kelly said. "The granite down there has caused a couple of issues for us. But it's not the biggest issue. Far and away, the biggest issue has been the escalation in construction costs over the last four or five years."
In addition, demolition of the boulders has proven to be more difficult than first thought, Kelly said.
"The granite is having to be rolled out, re-drilled, re-blasted, and then dealt with," Kelly told the committee. "Concerns with the site is something we've been continuously addressing since we've been there."
Unfortunately, dealing with the granite took longer than expected and was more expensive than initially thought"