Geotech Report 04 19 2021

VISUAL IDENTIFICATION OF SAMPLES The samples were identified in accordance with the American Society for Engineering Education System of Definition described by Professor Donald M. Burmeister in ASTM Special Technical Publication 479, 5th Edition, 1970. I. Definition of Soil Components and Fractions pen Eh on oF Sot 2 ompeonen! MATERIAL SYMBOL FRACTION SIEVE SIZE DEFINITION Boulders Bldr omy Material retained on 9" sieve. Cobbles Col 3" to on Material passing the 9" sieve and retained on the 3” sieve. Gravel Coarse (c) Medium (m) Fine (f) 1" to 3" 3/8" to 1" No. 10 to 3/8" Material passing the 3" sieve and retained on the No. 10 sieve. Sand Coarse (c) Medium (m) Fine (f) No.30 to No. 10 No.60 to No. 30 No.200 to No. 60 Material passing the No. 10 sieve and retained on the No. 200 sieve. Silt Passing No. 200 (0.074 mm) Material passing the No. 200 sieve that is non-plastic in character and exhibits little or no strength when air dried. Organic Silt (0$) Material passing the No. 200 sieve which exhibits plastic properties within a certain range of moisture content, and exhibits fine granular and organic characteristics. PLASTICITY PLASTICITY INDEX CLAY-SOIL Clayey SILT Cys Slight (sl) 1 to 5 Material passing the No. 200 sieve which can be made to exhibit plasticity and clay qualities within a certain range of moisture content, and which exhibits considerable strength when air- dried. SILT & CLAY S&C Low (1) 5 to 10 CLAY & SILT Css Medium (m) 10 to 20 Silty CLAY $yC High (h) 20 t 40 CLAY c Very High 40 plus (vh)