998 Classification Sand and Gravel, % Silt, % Clay, % Sand 80 – 100 0 – 20 0 – 20 Sandy Loam 50 – 80 0 – 50 0 – 20 Loam 30 – 50 30 – 50 0 – 20 Silty Loam 0 – 50 50 – 80 0 – 20 Silt 0 – 20 80 – 100 0 – 20 Sandy Clay Loam 50 – 80 0 – 30 20 – 30 Clay Loam 20 – 50 20 – 50 20 – 30 Silty Clay Loam 0 – 30 50 – 80 20 – 30 Sandy Clay 50 – 70 0 – 20 30 – 50 Silty Clay 0 –20 50 – 70 30 – 50 Clay 0 – 50 0 – 50 30 – 100
903.03 Soils Having 20% or More Retained on No 10 (2.00 mm) Sieve and More Than 20% Passing No. 200 (75 μm) Sieve
These soils shall be classified in accordance with 903.02, followed by a term describing the relative amount of gravel as follows: 20% to 35%: “with some gravel” 36% to 50%: “and gravel”
903.04 Soils Having 20% or More Retained on No. 10 (2.00 mm) Sieve and 20
Less Than 20% Passing No. 200 (75 μm) Sieve These soils shall be classified as follows: Classification Gravel, % Sand, % Silt, % Clay, % Gravel 85 – 100 0 – 15 0 – 15 0 – 15 Sandy Gravel 40 – 85 15 – 40 0 – 20 0 – 20 Gravelly Sand 20 – 40 40 – 80 0 – 20 0 – 20 Sand and Gravel 20 – 50 20 – 50 0 – 20 0 - 20 If the gradation of a given sample is not in exact accordance with the requirements for a given classification, it shall be placed in the classification to which it comes the closest.
903.05 Organic Soils The following classification system shall be used for organic soils in accordance 30
with AASHTO T 21 and AASHTO T 267. Classification Organic Content, % With Organic Matter* 4 - 15 Organic Soil (A-8)* 16 - 30 Peat (A-8) More than 30 * Soils classified in accordance with 903.02 shall also include this classification. 903.03
903.06 Marly Soils
The following classification system shall be used for marly soils with calcium and magnesium carbonate content in accordance with ITM 507. Classification Percentage With Trace Marl* 1 - 9 With Little Marl* 10 - 17 With Some Marl* 18 - 25 Marly Soil (A-8) 26 - 40 Marl (A-8) More than 40 * Soils classified in accordance with 903.02 shall also include this classification.