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GRAIN SIZE DESCRIPTION SIEVE SIZE GRAIN SIZE APPROXIMATE SIZE Boulders >12 in.(304.8 mm.) >12 in.(304.8 mm.) Larger than basketball-sized Cobbles 3-12 in.(76.2-304.8 mm.) 3-12 in.(76.2-304.8 mm.) Fist-sized to basketball-sized coarse 3/4-3 in.(19-76.2 mm.) 3/4-3 in.(19-76.2 mm.) Thumb-sized to fist-sized Gravel fine #4-3/4 in.(#4-19 mm.) 0.19-0.75 in.(4.8-19 mm.) Pea-sized to thumb-sized O coarse #10-#4 0.079-0.19 in.(2-4.9 mm.) Rock salt-sized to pea-sized Sand medium #40-#10 0.017-0.079 in.(0.43-2 mm.) Sugar-sized to rock salt-sized 0 fine #200-#40 0.0029-0.017 in.(0.07-0.43 mm.) Flour-sized to sugar-sized Fines Passing#200 <0.0029 in.(<0.07 mm.) Flour-sized and smaller SECONDARY CONSTITUENT MOISTURE CONTENT CEMENTATION AMOUNT DESCRIPTION FIELD TEST DESCRIPTION FIELD TEST Secondary Absence of Crumbles or breaks Term Secondary Constituent is Dry moisture,dusty, Weakly with handling or slight Of Constituent is Coarse dry to the touch finger pressure Use Fine Grained Grained Damp but no Crumbles or breaks <5% <15% Moist visible water Moderately fingerres prth essure ble Trace With 25 to<15% 215 to<30% Visible free water, Will not crumble or Wet usually soil is Strongly break with finger Modifier 215% 230% below water table pressure CONSISTENCY-FINE-GRAINED SOIL REACTION WITH HYDROCHLORIC ACID SPT-N. Pocket Pen UNCONFINED CONSISTENCY (#blows/ft) (tsf) COMPRESSIVE VISUAL/MANUAL CRITERIA DESCRIPTION FIELD TEST STRENGTH(Q,J(psf) VerySoft <2 PP<0.25 <500 Thumb will penetrate more than 1 inch(25 mm). None No visible Extrudes between fingers when squeezed. reaction Soft 2-4 0.255 PP<0.5 500-1000 Thumb will penetrate soil about 1 inch(25 mm). Remolded by light finger pressure. Some reaction, Weak with bubbles Medium Stiff 4-8 0.55 PP Remolded by strong finger pressure. Violent reaction, Stiff 8-15 1 S PP<2 2000-4000 Can be imprinted with considerable pressure from Strong with bubbles thumb. forming Thumb will not indent soil but readily indented with immediate) Very Stiff 15-30 29 PP<4 4000-8000 thumbnail. Hard >30 4S PP >8000 Thumbnail will not indent soil. FROM TERZAGHI AND PECK,1948;LAMBE AND WHITMAN,1969;FHWA,2002;AND ASTM D2488 APPARENT I RELATIVE DENSITY-COARSE-GRAINED SOIL PLASTICITY APPARENT SPT-N� MODIFIED CA CALIFORNIA RELATIVE DESCRIPTION LL FIELD TEST SAMPLER SAMPLER DENSITY DENSITY (#blows/ft) (#blowstft) (#blows/ft) N Non-plastic NP A content. (3 mm.)thread cannot be rolled at any water Very Loose <4 <4 <5 0-15 Low(L) <30 The thread can barely be rolled and the lump or thread cannot be formed when drier than the plastic limit. Loose 4-10 5-12 5-15 15-35 The thread is easy to roll and not much time is required to ch the plastic limit. The thread cannot be rerolled Medium(M) 30-50 rea Medium Dense 10-30 12-35 15-40 35-65 after reaching the plastic limit. The lump or thread crumbles when drier than the plastic limit. Dense 30-50 35-60 40-70 65-85 It takes considerable time rolling and kneading to reach the plastic limit. The thread can be rerolled several times Very Dense >50 >60 >70 85-100 High(H) >50 after reaching the plastic limit. The lump or thread can be formed without crumbling when drier than the plastic limit. FROM TERZAGHI AND PECK,1948 STRUCTURE ANGULARITY DESCRIPTION CRITERIA DESCRIPTION CRITERIA Stratified Alternating layers of varying material or color with layers at Angular Particles have sharp edges and relatively plane sides with least 1/4-in,thick note thickness. 9 unpolished surfaces. Laminated Alternating layers of varying material or color with the layer less than 1/4-in.thick note thickness. Subangular Particles are similar to angular description but have rounded Breaks along definite planes of fracture with edges. Fissured little resistance to fracturing. Subrounded Particles have nearly plane sides but have well-rounded comers Slickensided Fracture planes appear polished or glossy,sometimes striated. and edges. Blocky Cohesive soil that can be broken down into small angular lumps Rounded Particles have smoothly curved sides and no edges. which resist further breakdown. Lensed Indusion of small pockets of different soils,such as small lenses of sand scattered through a mass of clay;note thickness. PROJECT NO.: 20173772 FIGURE SOIL DESCRIPTION KEY DRAWN BY: G.G. KL E/NFEL DER CHECKED BY: S.W. 7 McFadden Construction Shop Building Bright People. Right Solutions. DATE: 3/14/2017 3855 East Farmington Road Stockton,California REVISED: -