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Figure 17. (Left) A drop box system. (Right) Close-up view of a drop box. 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.

(Left) A drop box system. (Right) Close-up view of a drop box. 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.