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Figure 12. Formation of a biomat beneath the drainfield over time after 1 day, 1 month, 1 year, and 3 to 8 years of operation Source: Hoover, MT, TA Disy, MA Pfeiffer, N. Dudley, R.B. Mayer, and B. Buffington. 1996. North Carolina Subsurface Wastewater System Operators Training School Manual. Soil Science Department, College of Agriculture and Life Sciences, North Carolina State University, Raleigh, NC and North Carolina Department of Environment, Health, and Natural Resources, Raleigh, NC.

Formation of a clogging mat beneath the drainfield over time after 1 day, 1 month, 1 year, and 3 to 8 years of operation. Source: Hoover, M.T., T.A. Disy, M.A. Pfeiffer, N. Dudley, R.B. Mayer, and B. Buffington. 1996. North Carolina Subsurface Wastewater System Operators Training School Manual. Soil Science Department, College of Agriculture and Life Sciences, North Carolina State University, Raleigh, NC and North Carolina Department of Environment, Health, and Natural Resources, Raleigh, NC.