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Construction Management HGC routinely provides construction management, quality assurance, and bid solicitation oversight services to solid waste clients. These services are provided directly by field staff maintained by HGC. HGC staff have performed quality assurance/quality control services on landfill expansion and closure projects, as well as vapor extraction and flare construction projects. HGC is a licensed contractor in the State of Arizona for the construction of soil and groundwater remediation systems. HYDRO GEO CHEM, INC.
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