Page 55 - 2021 Sustainability Report

ENVIRONMENTAL STEWARDSHIP

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installed Shumaker Industries “Load and Go Ready Mix Truck Wash” systems, with the final 13 being installed in 2021.
These systems dramatically reduce the amount of water used to clean ready mix trucks after loading, reducing both water
use and runoff.

The West Division continues to work in cooperation with the City of Denver, the City of Aurora and the State of Colorado
to create much-needed new fresh water reservoirs at our facilities. These water projects include on-going projects at our
Riverbend Sand & Gravel, 35th Avenue, Taft Sand & Gravel, Specification Aggregates, Duckworth, and Heaton facilities
with the opportunity to repurpose more pits in the future. The West Division is also working to develop storage facilities in
other locations within its footprint.

Our Colorado Front Range operations are situated adjacent to rivers, streams and ditches that provide vital water for
agricultural, residential and commercial purposes. This system of water distribution through streams and ditches was
established in the 1880’s supplying water from the Mountains to the Front Range below. Through our numerous water
rights, 3 state approved reservoirs and 4 leases, Martin Marietta operates to ensure there is no net water loss to the
stream system. This means that our total water usage is returned back monthly to the stream system and the surrounding
aquifers. In 2021, Martin Marietta again returned over 130 million gallons of water back to the environment through this
process.

While water conservation and protection is key in our western operations, it is not neglected elsewhere. For example, our
East Division has spent more than $5 million dollars in the past two years on clarifier and other water system upgrades to
ensure both process water recovery and stream protection.

Our Medina Rock & Rail water recovery pond
Hondo, Texas

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