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Application for Succession of Operators October 2017 <br /> • Project and technical management for the development of a reclamation and closure plan <br /> addressing the environmental liabilities of over 35 historic mines, tailings and other <br /> infrastructure across a 250 km2 district; <br /> • Design and construction of new water treatment plants to ensure compliance with water <br /> discharge standards; <br /> • Removal of hazardous human health and safety conditions including open shafts and holes; <br /> • Develop and perform technical and scientific studies and field programs to support the <br /> reclamation and closure designs and components including performing the detailed <br /> engineering design for closure; <br /> • Consult and engage with local communities,First Nations,territorial and federal regulators <br /> and other agencies in the development of the plan; and <br /> • Provide environmental assessment and permitting for new mines and development projects <br /> in the district. <br /> Globeville Smelter—State of Colorado, Denver, CO <br /> As part of the Asarco bankruptcy proceedings,the State of Colorado(CDPHE)acted as the trustee <br /> of site remediation, retaining AEG as the lead environmental consultant and contractor for all <br /> remediation activities. The scope of work for AEG included a wide range of services for site <br /> remediation, with total project services and site remediation costs exceeding $15M. More <br /> specifically, it included: <br /> • Design, construction and commissioning of an active water treatment facility in less than <br /> 90 days, treating primarily lead, zinc, cadmium and arsenic. <br /> • Soils remediation for 13 acres of low pH plant soils, 17 acres of waste gypsum materials <br /> and scattered high arsenic soils. Final soil products met stability tests for geochemical <br /> leaching and geotechnical strength to allow for redevelopment. <br /> • Insitu treatment of impacted groundwater using biological sulfate reduction, resulting in <br /> arsenic, cadmium, selenium and zinc precipitation. The treatment process targeted known <br /> source areas, allowing for groundwater remediation standards to be achieved in less than 4 <br /> years and resulting in metal concentrations in the active water treatment plant influent to <br /> be reduced by 99%. <br /> Gold King Mine—Environmental Restoration—Silverton, CO <br /> On August 5,2015 the abandoned Gold King Mine near Silverton,Colorado inundated the Animas <br /> river with mine waste, triggering an emergency response by the US Environmental Protection <br /> Agency (EPA). AEG's scope of work was focused on the design and construction of an active <br /> water treatment plant to stem the flow of contaminants. More specifically, it included: <br /> • Design, construction and commissioning of an active water treatment facility for the US <br /> 12 <br />