Columbia Ridge operator says RNG plant nearly complete, landfill expansion and leachate pond planned
Waste Management and Columbia Ridge engineers told the Gilliam County Court the renewable natural gas (RNG) plant is about 95% complete, with phased commissioning this fall and early 2026. Work planned includes drilling additional gas collection wells, a 7.2‑acre leachate pond and soil movement for Module 17.
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The Gilliam County Court heard a detailed operations update from Columbia Ridge landfill staff on July 16 in Arlington, outlining progress on the site’s renewable natural gas plant, gas-collection expansion and other infrastructure projects.
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