Schlumberger soundings and interpretations
Figure 20: Schlumberger sounding and interpretation, Kitty Todd (see Figure 4). Figure 23 includes labels explaining data (small circles), calculated curve (smooth curve), simple 4-layered model, equivalent models (alternate models that yield the same calculated curve) and a 'detailed' curve (one layer per data point). Anyone who wants to discuss this in detail should send an email to Dr. Don Stierman.
Table 2: Kitty Todd electrical stratigraphy (Figure 20).
Layer
|
Resistivity (Ωm)
|
Depth (m) to top/bottom
|
Interpretation
|
1
|
1570
|
0/1.2
|
Moist sand
|
2
|
206
|
1.2/9.3
|
Water-saturated sand
|
3
|
107
|
9.3/30
|
Ohio Shale
|
4
|
800
|
30/??
|
Carbonate bedrock
|
Figure 21: Schlumberger sounding and interpretation, Stranahan Elementary (see Figure 5). The location for this sounding, not indicated in Figure 5, is near the south end of GPR profile 2.
Table 3: Stranahan Elementary electrical resistivity, sounding 1 (Figure 21).
Layer
|
Resistivity (Ωm)
|
Depth (m) to top/bottom
|
Interpretation
|
1
|
1434
|
0/1.1
|
Loose sand
|
2
|
496
|
1.1/4.5
|
Compact, damp, under-saturated sand
|
3
|
28
|
4.5/9.5
|
Clay or till
|
4
|
148
|
9.5/??
|
lacustrine silt
|
This sounding point is near the valley incised by 10 Mile Creek, which probably allows groundwater that saturates shallow sand elsewhere to drain away.
Figure
22: Schulmberger sound and interpretation, Stranahan Elementary (Figure
5).
Table 4: Stranahan Elementary electrical resistivity, sounding 2
(Figure 22).
Layer
|
Resistivity (Ωm)
|
Depth (m) to top/bottom
|
Interpretation
|
1
|
4775
|
0/2.1
|
Loose, dry sand
|
2
|
102
|
2.1/25
|
Water-saturated sand
|
3
|
188
|
25/??
|
lacustrine silt
|
It is interesting that significant differences exist between Figure 22 and Figure 23, this merits further study. This delta may be quite complex.
Figure 23: Schlumberger sounding and interpretation, Secor Metropark (Figure 6).
Table 5: Secor Metropark electrical stratigraphy
Layer
|
Resistivity (Ωm)
|
Depth (m) to top/bottom
|
Interpretation
|
1
|
2740
|
0/3.5
|
Loose unsaturated sand
|
2
|
69
|
3.5/11.5
|
Saturated sand
|
3
|
223
|
11.5/??
|
Ohio Shale
|