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KEY TO SYMBOLS WewFieldS <br /> Symbol Description <br /> Soil Samplers Particle Size Reference <br /> Standard Penetration Test Component Particle Size Range <br /> Boulders 12" <br /> m California Sampler Cobbles 3" - 12" <br /> Undisturbed Thin Wall Shelby Tube Gravels <br /> Coarse Gravel 3" -3/a" <br /> Groundwater Symbols Fine Gravel '/4" - No. 4 (4.75mm) <br /> Water Encountered During Drilling Sand <br /> Coarse Sand No. 4 (4.75mm) - No. 10 (2mm) <br /> y_ Water Encountered After Drilling Medium Sand No. 10 (2mm) - No. 40 (0.42mm) <br /> Fine Sand No. 40 (0.42mm) - No. 200 <br /> NFWE: No Free Water Encountered 0.075mm <br /> Silt & Clay < No. 200 <br /> Moisture Condition <br /> Dry Absence of moisture; dusty; dry to touch Apparent Density of Coarse-Grained Soils <br /> Moist Damp but no visible water Apparent SPT (# Mod. Cal. <br /> density blows/ft) Sampler <br /> Wet Visible free water; usually below water table Very loose < 4 < 4 <br /> PiggigLty Loose 4 - 10 5- 12 <br /> Will not support 6 mm diameter roll Med. Dense 10— 30 12 — 35 <br /> lone if held on end PI = 0 Dense 30- 50 35 -60 <br /> Slight -- 1 < PI < 5 Very dense > 50 > 60 <br /> 6 mm diameter roll can be <br /> Low repeatedly rolled and supports 5 < PI < 10 Consistency of Fine-Grained Soils <br /> itself, 4 mm diameter roll does not Consistency SPT (# Mod. Cal. <br /> 4 mm diameter roll can be blows/ft) Sampler <br /> Medium repeatedly rolled and supports 10 < PI < 20 <br /> itself, 2 mm diameter roll does not Very soft < 2 < 3 <br /> 2 mm diameter roll can be Soft 2 -4 3- 5 <br /> High repeatedly rolled and supports itself 20 < PI < 40 Med. Stiff 4 -8 5 - 10 <br /> Angularity of Coarse-Grained Particles Stiff 8- 15 10 -20 <br /> Very Stiff 15 - 30 20 - 39 <br /> Angular Particles have sharp edges and relatively Hard > 30 > 40 <br /> lane sides with unpolished surfaces <br /> Sub- Edges more rounded Cementation <br /> Angular <br /> Sub- Particles have nearly plane sides but rumbles with little anger <br /> Weak pressure <br /> Rounded have well-rounded corners and edges <br /> Rounded Particles have smooth, curved sides and Moderate Crumbles with considerable <br /> no edges finger pressure <br /> Dilatancy Strong Will not break with finger <br /> pressure <br /> None No visible change in the specimen <br /> Water appears slowly on the surface of the <br /> Slow specimen during shaking and does not disappear <br /> upon squeezing <br /> Rapid Water appears quickly on the surface during <br /> shaking and disappears quickly upon squeezing <br />