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 SAMPLE SOIL BORING LEGEND
GROUP
MAJOR DIVISIONS
TYPICAL NAMES
SYMBOLS
CLEAN
GW
Well graded gravels, gravel - sand mixtures, little or no fines.
GRAVELS
GRAVELS
(More than
(Little or no
50% of
fines)
GP
Poorly graded gravels or gravel - sand mixtures, little or no
coarse
fines.
fraction is
LARGER
GRAVELS
GM
Silty gravels, gravel - sand - silt mixtures.
than the
WITH
No. 4 sieve
FINES
size)
(Appreciable
COARSE
amount of
GC
Clayey gravels, gravel - sand - clay mixtures.
GRAINED
fines)
SOILS
(More than 50%
of material is
SW
Well graded sands, gravelly sands, little or no fines.
LARGER than
CLEAN
No. 200 sieve
SANDS
SANDS
size)
(More than
(Little or no
50% of
fines)
SP
Poorly graded sands or gravelly sands, little or no fines.
coarse
fraction is
smaller than
SM
Silty sands, sand - silt mixtures.
SANDS
the No. 4
WITH
sieve size)
FINES
(Appreciable
amount of
SC
Clayey sands, sand - clay mixtures.
fines)
ML
Inorganic silts, and very fine sands, rock flour, silty or clayey
fine sands or clayey silts with slight plasticity.
SILTS AND CLAYS
(Liquid limit LESS than 50)
CL
Inorganic clays of low to medium plasticity, gravelly clays,
sandy clays, silty clays, lean clays.
FINE
OL
Organic silts and organic silty clays of low plasticity.
GRAINED
SOILS
(More than
50% of
MH
Inorganic silts, micaceous or diatomaceous fine sandy or
material is
silty soils, elastic silts.
SILTS AND CLAYS
(Liquid limit GREATER than
SMALLER
50)
than No. 200
CH
Inorganic clays of high plasticity, fat clays.
sieve size)
OH
Organic clays of medium to high plasticity, organic silts.
Pt
Pest and other highly organic soils.
HIGHLY ORGANIC SOILS
BOUNDARY CLASSIFICATIONS: Soils possessing characteristics of two groups are designated by combinations of group symbols.
PARTICLE
SIZE
LIMITS
SILT OR CLAY
SAND
GRAVEL
COBBLES
BOULDERS
Fine
Medium
Coarse
Fine
Coarse
3/4″
3″
No. 200
No. 40
No. 10
No. 4
12″
U.S.
STANDARD
SIEVE
SIZE
UNIFIED SOIL CLASSIFICATION SYSTEM
Reference:
The Unified Soil Classification System, Corps of Engineers, U.S. Army
Technical Memorandum No. 3-357. Vol 1, March, 1953 (Revised April, 1960)
Exhibit 3-C
41
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