Geotech Report 02 12 2024

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 MATERIAL SYMBOL FRACTION SIEVE SIZE DEFINITION Boulders Bldr — gu + Material retained on 9" sieve. Cobbles Chl -- 3" to 9" Material passing the 9" sieve and retained on the 3" sieve. Gravel G Coarse (c) 1" to 3" Material passing Medium (m) 3/8" to 1" the 3" sieve and Fine (f) No. 10 to 3/8" retained on the No, 10 sieve. Sand s Coarse (c) No.30 to No. 10 Material passing Medium (m) No.60 to No. 30 | the No. 10 sieve Fine (f) No.200 to No. 60 | and retained on the No. 200 sieve. Silt $ al Passing No. 200 Material passing (0.074 mm) 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, organic characteristics. and exhibits fine granular and PLASTICITY PLASTICITY INDEX CLAY-SOIL Clayey SILT Cys Slight (sl) lito 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 SEC Low (1) 5 to 10 CLAY & SILT cas Medium (m) 10 to 20 Silty CLAY $yC High (h) 20 t 40 CLAY Cc Very High 40 plus (vh)