Wastewater disposal projects that include subsurface disposal alternatives often involve a set of complex issues, and are surrounded by heightened regulatory requirements and public scrutiny. Furthermore, past operation of lagoons, impoundments, and injection systems have resulted in releases to the environment, and McLane Environmental is often called upon to evaluate the impacts of these releases.

Analyses we have performed for subsurface wastewater disposal systems include:

• Impoundment berm material volume and hydraulic permeability analyses;
• Liquid disposal area siting and permitting studies;
• Depth to ground water and ground water mounding calculations;
• Liquid infiltration and chemical loading rate calculations;
• Chemical fate and transport analyses;
• Exposure and risk assessment for liquid disposal basin closure;
• Analyses to support attainment of RCRA clean-closure requirements;
• Analysis of industrial impoundments and leach fields as potential sources of contamination to soil and ground water;
• GIS and computer modeling analyses to support disposal area engineering design; and
• Nitrogen loading and plume impacts modeling analyses.

McLane Environmental has investigated, analyzed, and assisted in the design of numerous industrial, municipal, and private subsurface disposal systems. We have performed exposure and risk assessment studies to establish closure or cleanup criteria for wastewater basins, and have conducted modeling studies to analyze remedial alternatives for subsurface contamination resulting from wastewater impoundment releases. Nitrogen loading can be of particular concern when planning, designing, and evaluating wastewater disposal methods, and McLane Environmental is experienced at performing nitrogen loading studies for municipal and residential systems.

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