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Soil Test Probe

Determine soil conditions without
taking core samples

The Chance Soil Test Probe is a mechanical instrument which enables the operator to determine the condition of the sub-soil without core samples. A ratchet-handle torque wrench which slides up and down on the shaft is used to install or retract the probe. Torque wrench readings, in inch-pounds, provide a way to measure the consistency of the sub-soil. The torque values obtained are translated into soil classifications using the copyrighted Chance Soil Classification Table (see below) located on the inside flap of the carrying case.

Torque readings are taken at the depth to which an anchor is to be installed, and at least 2 feet above this depth because the average earth consistency 2 to 3 feet above the anchor determines the anchor holding capacity. The probe shaft is marked at 1-foot intervals permitting soil evaluation at every foot of depth.

The length of the Soil Test Probe (including helix) is 5 feet. Each shaft coupled to the probe provides an additional 5 feet. A durable carrying case protects the equipment when not in use.

Cat. No. Description Length Weight
C3090032 Probe w/ 3 5-ft. extensions 20' 21-1/2 lb.
Catalog No. Description Weight
C3090033 5-ft. extension only 3 lb.
SOIL CLASSIFICATION DATA
Class Common Soil-Type Description Geological Soil Classification Probe Values
ft-lbs.
in.-lbs.
(NM)
Typical Blow Count "N" per ASTM-D1586
N.A. Sound hard rock unweathered (bedrock) Granite, Basalt, Massive Limestone N.A. N.A.
1 Very dense and/or cemented sands; coarse gravel and cobbles Caliche, (Nitrate-bearing gravel/rock) 63 - 39
750 - 1600
(85-181)
60-100+
2 Dense fine sands; very hard silts and clays (may be preloaded) Basal till; boulder clay; caliche; weathered laminated rock 50 - 63
600 - 750
(68-85)
45-60
3 Dense sands and gravel; hard silts and clays Glacial till; weathered shales, schist, gneiss and siltstone 42 - 50
500 - 600
(56 - 68)
35-50
4 Medium dense sand and gravel; very stiff to hard silts and clays Glacial till; hardpan; marls 33 - 42
400 - 500
(45 - 56)
24-40
5 Medium dense coarse sands and sandy gravels; stiff to very stiff silts and clays Saprolites, residual soils 25 - 33
300 - 400
(34 - 45)
14-25
6* Loose to medium dense fine to coarse sands to stiff clays and silts Dense hydraulic fill; compacted fill; residual soils 17 - 25
200 - 300
(23 - 34)
7-14
7 Loose fine sands; Alluvium; loess; medium - stiff and varied clays; fill Flood plain soils; lake clays; adobe; gumbo, fill 8 - 17
100 - 200
(11 - 23)
4-8
8 Peat, organic silts; inundated silts, fly ash very loose sands, very soft to soft clays Miscellaneous fill, swamp marsh <8
<100
(0 - 11)
0-5
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