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CDPHE GEM rules and GCC Pueblo: audit finds facility meets best‑available controls; company pursuing alternative fuels and blended cements

Colorado State Board of Land Commissioners · November 17, 2025
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Summary

Colorado Department of Public Health & Environment staff reported that GCC Rio Grande (Pueblo) met GEM 1 best‑available emissions and energy BMP determinations in the 2022 audit cycle; GCC described steps including EnergyStar certification, blended cements and ~20% alternative fuel use and said it is evaluating higher alternative‑fuel rates and carbon‑capture options.

Colorado air‑quality officials and GCC representatives briefed the State Land Board on Regulation 27 (GEM rules) and the results of the first GEM‑1 audit cycle.

CDPHE staff explained GEM 1 covers energy‑intensive, trade‑exposed manufacturers and requires five‑year third‑party audits to establish an emissions…

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