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Soil Classification Chart

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

Class 1 soils are difficult to probe consistently and the ASTM blow count may be of questionable value.

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