Michael Mahon, P.E.

I was a Project Engineer and Project Manager, who provided construction management/oversight services during reclamation at this former zinc/lead mine. Construction operations include: waste rock consolidation, regrading of a 14-acre waste rock pile, reconstruction of 1,500 feet of stream banks and floodplain, reclamation of impacted wetland areas, placement of a geosynthetic clay liner/two-foot soil cover over the regraded waste rock pile, construction of surface/subsurface interception system to intercept surface/subsurface flow upgradient of the waste rock pile, permitting/development/reclamation of several borrow areas, construction of gabion-lined surface water channels, implementation of an extensive revegetation/reforestation program and development and implementation of a site-wide storm water management plan that includes the development and maintenance of storm water Best Management Practices.

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I also helped design and provided construction oversight for the restoration of a tributary to the Pecos River, located in northern New Mexico, which was impacted by metals and sediment loading from historic lead/zinc mining operations. Restoration included temporarily diverting stream flow so that waste rock and metals-impacted soils could be removed from the floodplain. This was followed by reconstruction of the stream channel, banks, and floodplain and revegetating the banks and floodplain with native species. Drop structures were installed to approximate natural step/pool conditions. Buried grade control structures were installed to provide long term channel stability, while maintaining a natural appearance on the surface.