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Electrical Conductivity of a Failed Septic System Soil Absorption Field

^a Agronomy Dep., Purdue Univ., West Lafayette, IN 47907
^b USDA-NRCS-NSSC, 11 Campus Blvd., Suite 200, Newton Square, PA, 19073
^c Dualem Inc., 540 Churchill Ave., Milton, ON, Canada L9T 3A2
^d USDA-NRCS-NSSC, P.O. Box 60, Wilkesboro, NC 28697

View larger version (65K): [in a new window]   Fig. 1. Topographic survey of study site. Vertical exaggeration is 10-fold. Septic system components were identified on soil surface or by tile probe.

View larger version (89K): [in a new window]   Fig. 2. Spatial distribution of ECa collected with the DUALEM-2 along a north–south traverse under the following conditions: (A) December 2001 (wet soil moisture condition), perpendicular (PRP) geometry; (B) December 2001, horizontal coplanar (HCP) geometry; (C) July 2002 (dry soil moisture condition), PRP geometry; and (D) July 2002, HCP geometry.

View larger version (33K): [in a new window]   Fig. 3. Two-dimensional depiction of apparent electrical conductivity (ECa) along transect x–x' (line 20 east, south to north). The septic system absorption field had a greater ECa under both the wet soil moisture conditions of the December 2001 survey and dry soil moisture conditions of the July 2002 survey.

View larger version (20K): [in a new window]   Fig. 4. Unweighted average saturated paste electrical conductivity (ECsat) to 1.2-m depth relative to the measured apparent electrical conductivity (ECa) collected in the perpendicular orientation (1-m depth) along three transect lines. In all transects, ECa was lower than ECsat.

View larger version (15K): [in a new window]   Fig. 5. There was a significant correlation (r = 0.79, P < 0.01) between the apparent electrical conductivity measured in the perpendicular geometry (1-m depth) relative to the average saturated paste electrical conductivity measured to a depth of 1.2 m.