Procedures have been developed for evaluating
the suitability of natural soils for on-site septic systems, but the suitability
of certain disturbed or man-made soils is uncertain. The Indiana
State Department of Health, Sanitary Engineering, Residential Sewage Disposal
Section has been investigating the hydrologic characteristics of mine spoil
(the disturbed overburden from surface mining).An investigation of the suitability of mine spoil for septic systems is described in Hydrologic Suitability of Mine Spoil as a Medium for Septic-Tank Absorption Fields, Warrick County, Indiana.