IRSS Resources
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Soil and Landscape Evaluation Report for On-Site Sewage Disposal Systems (pdf, source: forms.in.gov)
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DSat8 and Seasonal High Water Tables in Indiana Soils (pdf, 106kb)
DSat8 is the depth to which the soil water table "usually rises." More technically, it is the depth below which a soil is saturated more than 8% of the time. Depth to reduction depletions (DRD) is the depth to certain gray colors in the soil. For most soils, DSat8 and DRD are at about the same depth, but for other soils DSat8 is higher in the soil than DRD. Soil scientists are encouraged to report both DRD and DSat8 on evaluation reports for onsite sewage disposal systems. It gives them the opportunity to report that a certain soil is probably wetter than indicated by gray colors. It provides regulators, system designers, and installers a clue that perhaps a system will work better if interceptor drains and surface diversions are installed upslope of the proposed soil absorption field or that perimeter drains.
This paper expands, and slightly revises, the discussion on pages 49 to 52 of AY-323.
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Reference Soil Texture Samples: You may purchase soil samples to help calibrate your evaluation of soil texture. Soil analysis information and ordering instructions are on the Agronomy website: http://www.agry.purdue.edu/agryclub/soilsamples/
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Texture Estimate Calculator (xls, 48kb) - Can be used to calculate the score of estimated textures compared to laboratory data.
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How to File a Complaint Against an Indiana Registered Soil Scientist (pdf, 129kb)