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HOUSTON — TerraFirma Earth Technologies, a Houston-based dewatering firm, is moving its headquarters to a larger office and yard space in Houston to accommodate more heavy equipment and office space requirements. The new corporate headquarters is located at 11215 Old Fairbanks N. Houston Road. The firm is moving its headquarters Dec. 1 and also has opened a satellite office in Denver. TerraFirma assists owners and contractors throughout the U.S. maintain acceptable groundwater levels for both temporary and permanent projects.