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

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.

¹ Contribution from the Wis. Geol. Nat. History Survey—Univ. Extension, Madison in cooperation with the Soils Dep., College of Agricultural and Life Sciences, Univ. of Wis., Madison. This research was part of the Small Scale Waste Management Project of the Univ. of Wisconsin.

² Project Assistants, Wis. Geol. Nat. Hist. Survey and Associate Professor of Soil Science, Wis. Geol. Nat. Hist. Survey, Univ. Extension and Soils Dept., College of Agricultural and Life Sciences, Univ. of Wisconsin.

Received for publication October 15, 1973. Accepted for publication January 18, 1974.