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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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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



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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