TM 5-814-3/AFM 88-11, Volume III
streams, 10 feet from any dwelling or property lines. Soil testing is a mandatory prerequisite for any
subsurface disposal of waste. MIL-STD 619 B specifies soil testing methodologies. Finally, local and State
regulations must be consulted for additional mandatory requirements.
b. Leaching wells. Leaching wells can be used for septic tank effluent disposal where subsoil is porous.
Although absorption beds are generally preferred, site characteristics and cost considerations may encourage
the use of a leaching well. Wells are constructed with masonry blocks or stone with lateral openings, and
gravel outside to prevent sand from entering the well. If more than one well is required, they should be
spaced at intervals with at least twice the diameter of a well as distance between well hole sides. Percolation
area is that area on the side and bottom of the hole for the leaching well. The bottom of a leaching well
should be 4 feet above seasonal high water. See figure 6-3 and EPA Manual No.625/1-80-012.