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Soil Classification Chart

SOIL CLASSIFICATION DATA
Class Common Soil-Type Description Geological Soil Classification Probe Values ft.-lb. (NM) Typical Blow Count "N" per ASTM-D1586
0 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) over 60
(85 - 181)		 60-100+
2 Dense fine sands; very hard silts and clays (may be preloaded) Basal till; boulder clay; caliche; weathered laminated rock over 50
(68 - 85)		 45-60
3 Dense sands and gravel; hard silts and clays Glacial till; weathered shales, schist, gneiss and siltstone 42 - 50
56 - 68		 35-50
4 Medium dense sand and gravel; very stiff to hard silts and clays Glacial till; hardpan; marls 33 - 42
(45 - 56)		 24-40
5 Medium dense coarse sands and sandy gravels; stiff to very stiff silts and clays Saprolites, residual soils 25 - 33
(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
(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
(11 - 23)		 4-8
**8 Peat, organic silts; inundated silts, fly ash very loose sands, very soft to soft clays Miscellaneous fill, swamp marsh under 8
(0 - 11)		 0-5
  • **It is advisable to install anchors deep enough, by the use of extensions, to penetrate a Class 5 or 6, underlying the Class 7 or 8 Soils.

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

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