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This article in SSSAJ

  1. Vol. 38 No. 3, p. 497-501
     
    Received: Oct 15, 1973
    Accepted: Jan 18, 1974


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doi:10.2136/sssaj1974.03615995003800030032x

Soil Mottling and Drainage in a Mollic Hapludalf as Related to Suitability for Septic Tank Construction1

  1. M. J. Vepraskas,
  2. F. G. Baker and
  3. J. Bouma2

Abstract

Abstract

The feasibility of septic tank construction in a fine silty Mollic Hapludalf, with a mottled subsoil overlying permanently unsaturated sand, was investigated by measuring K values and soil drainage rates in situ. Mottles with chromas of 2 inside peds in the silty clay loam subsoil indicated reducing conditions and channel and plane neoferrans indicated oxidative conditions in the larger pores. Physical data showed high K values and drainage rates at saturation, due to channels and planes, but a very strong drop of these values upon desaturation. Lack of extended saturation of the entire subsoil makes possible excavation of the silt cap and construction of a septic tank seepage bed in the underlying sand.

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