Page 76 - Martin Marietta - 2024 Sustainability Report

ENVIRONMENTAL STEWARDSHIP

In addition to energy savings, the technology and infrastructure of the new plant has allowed the Eden Prairie team to
reduce its GHG emissions per ton produced by 10%. Filterable particulate matter (PM) emissions per ton produced were
also reduced by 80%, according to recent compliance tests.

The reduction in GHG emissions is a direct result of the new plant requiring 10% less natural gas per ton of asphalt
produced, said Senior Environmental Engineer Paul Schultz. While designers of the old plant attempted to reduce PM
emissions and waste, the technology used in the new plant is far more effective, he added.

“Baghouse fines were introduced into the mix with the old asphalt plant, but the method to reuse the fines created
fugitive emissions,” Schultz said. “The new plant uses a closed system to send baghouse fines back into the drum, which
significantly reduces the fugitive emissions associated with the process.”

As results came in at Eden Prairie, the Minnesota team was not content to sit on its laurels. With the resulting efficiency
improvements and environmental benefits, the team justified making similar upgrades at our Maple Grove, Elk River and
Scandia plants as well. Currently we are also upgrading our Burnsville plant and expect this project to be complete in
2025. The Company continues to evaluate similar installations and monitor the performance of the new equipment in
varying conditions.

Seen here, Eden Prairie MN’s new batch plant helped the site conserve an
estimated 426,000 kwh, enough to power 30-35 local homes for a full year.

74 2024 SUSTAINABILITY REPORT