ADA, OK The Holcim Cement Plant in Ada was built in 1907, just a month before Oklahoma became a state.
The plant provides the infrastructure for most of southern Oklahoma.
"We're just absolutely intertwined with the community," plant manager Mike Langan said.
The plant hadn't been updated since the 1960's, and was barely meeting EPA standards.
So the company started a 3 year modernization project, and it cost 100 million dollars.
"It's been amazing we were on the point, if this hadn't of happened, we would've all been without a job," longtime employee Tony Pierce said.
Langan says modernizing the plant secured 120 jobs.
"The Ada plant expansion had at it's core one major goal and that was to make it environmentally compliant," plant engineer Joseph Hart said.
"It took over 900-thousand man hours to build this plant, we were able to build it with no serious injuries," Langan said.
The modernized plant has a new kiln line that meets and exceeds emission limits set by the Federal government.
It has also increased its manufacturing capacity by 20 percent.
"The plant is now up and running and we're just as happy as we can be about it.," Langan said.
"I can't think of better way to show appreciation to a city that's been supportive as Ada has than to put some faith into us and say, okay, let's see what you can do," Hart said.