Page 50 - 2021 Sustainability Report

ENVIRONMENTAL STEWARDSHIP

Our Roadmap

Our roadmap to achieving these reduction targets includes numerous actions we have committed to, through current or
recent investments and operational improvements, as well as future steps we are evaluating, including:

Coal replacement and tire derived fuel (TDF) investments Capital investments in more efficient, lower
• In the last five years, we have invested in tire handling emission transportation systems and emissions
systems at both the Midlothian and Hunter Cement reduction equipment
plants and in 2021, tires made up almost 30% of our • Reduced fuel use in our aggregates business by converting
fuel mix. We are currently considering additional tire from quarry trucks to conveyor belt systems, right-sizing
handling upgrades at the Hunter facility. trucks and installing fleet management software.
• We are in the process of permitting and installing a • Currently we are using five (5) 944K John Deere hybrid
larger natural gas line to the Hunter Cement Plant which wheel loaders in five different operations to evaluate
is now expected to be completed in the second half of them in a variety of conditions. Initial results are
2022 and will further reduce our coal usage. promising with up to 5700 fewer gallons of fuel used

• We have reduced coal in the fuel mix at our cement annually versus a comparable traditional diesel loader.
plants from a high of almost 70% to 13.5%. We are working with our other heavy equipment
vendors as they develop their own heavy electric and
Use of additional alternative fuels, including the
hybrid vehicle technology.
purchase of wind energy and other renewables
• Continued upgrading our mobile equipment fleets to
• In 2021 we continued to make use of B99 Biodiesel in
newer, cleaner burning equipment
our Midwest Division and emitted 5600 fewer metric
tonnes of CO than if we had used ordinary diesel. Operational improvements
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• At our Woodville, Ohio lime Magnesia Specialties plant • Adding slag to our process, using our CemStar patented
we have embarked on a wind energy project that will technology. In 2021, the slag addition represented
provide much of the power needed to operate the almost 5% of our clinker production.
facility. • We are conducting pilot studies of the CarbonCure
• We are currently evaluating both wind and solar power system in our ready mix business. This system injects
projects in our cement businesses. recycled CO 2 into the concrete mix to reduce its carbon
footprint without impacting its performance.
Rollout of PLC Cement
• We are currently undertaking a $135 million
• With the approval of PLC by both CALTRANS and
modernization of our Finish Mill 7 at the Midlothian
TXDOT, we have begun a rollout of this product.
Cement plant, which will increase efficiency and reduce
• PLC cements can reduce the GHG footprint of our energy consumption at the facility.
cement product line up to 10%.
Investments in our business to develop and market
Continued use of synthetic gypsum as a substitute products that deliver meaningful environmental
for natural gypsum benefits, including reducing emissions and chemical use
• Synthetic gypsum is a byproduct of flue gas • Scrubber stone produced by our limestone operations
desulfurization (FGD) — a scrubbing technology utilized is used by power producers in controlling sulfur
by many coal-fired power plants to reduce SO . dioxide emissions.
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• In 2021 we reduced our need for mined gypsum by 46% • Products manufactured by our magnesia specialties
over 2017. business assist in purifying industrial and municipal

• Using recaptured gypsum helps to divert 51,000 tons wastewater, neutralizing nuclear waste and reducing
from overburdened landfills. chemical usage and wood demand in paper production.

48 2021 SUSTAINABILITY REPORT