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TERM GRAIN SIZE EXAMPLES _.-v . ..c -�r^r�' "�'",Y.•Tom✓ .
<br /> Boulders >12" >Basketball
<br /> Cobbles 3"to 12" Fist to basketball FIELD REFERENCE
<br /> Gravel-coarse 3/4"to 3" Thumb to fist SOIL CLASSIFICATION
<br /> ' Gravel-fine #4 to 3/4" Pea to thumb
<br /> Sand-coarse #10 to#4(5 mm) Rock salt to peat MOISTURE CONTENT
<br /> Dry Dusty,dry to the touch
<br /> Sand-medium #40 to#10(2 mm) Sugar to rock salt Moist Damp but no visible
<br /> .
<br /> V Sand-fine #200 to#40(0.4 mm) Flour to sugar water near optimum
<br /> .b `
<br /> Wet Visible free water,
<br /> Fines <#200(0.08 mm) Grains not visible saturated,over optimum
<br /> RELATIVE DENSITY OF COARSE-GRAINED(COHESIONLESS)SOILS
<br /> .: (Cohesionless Silt,Sand,and Gravel)
<br /> N.SPT, RELATIVE
<br /> ` BLOWS/FT DENSITY FIELD TEST FOR RELATIVE DENSITY OF SAND
<br /> 0 to 4 Very loose Easily penetrated with 112"reinforcing rod pushed by hand
<br /> 4 to 10 Loose Easily penetrated with 1/2"reinforcing rod pushed by hand
<br /> 10 to 30 Medium dense Penetrated one foot with 1/2 reinforcing rod driven with 54b hammer
<br /> :< .. " g
<br /> EXAMPLES 30 to 50 Dense Penetrated one foot with 1/2"reinforcing rod driven with 54b hammer
<br /> Very dense,light brown,slightly silty, Over 50 Very dense Penetrated only a flew inches with 1/2"reinf.rod driven with 54b hammer
<br /> t3 sandy fine GRAVEL,trace of cobbles;
<br /> S moist;scattered roots;(Weathered Till)
<br /> GP-GM. RELATIVE CONSISTENCY OF FINE-GRAINED(COHESIVE)SOILS
<br /> (Cohesive Silt,Clayey Silt,and Clay)
<br /> Medium stiff,dark gray,silty CLAY,trace
<br /> of fine sand;moist;laminated(<2mm) N_SPT, RELATIVE TORVANE,tsf POC.PEN.,tsf
<br /> with light gray silt,occasional BLOWS/FT CONSISTENCY SHEAR STR. UNCONF.STR. MANUAL PENETRATION TEST
<br /> slickensides;(Glaciolacustrine)CL. <2 Very soft <0.13 <0.25 Easy several.inches by fist
<br /> r.�
<br /> Medium dense,dark brown,sandy SILT, 2 to 4 Soft 0.13 to 0.25 0.25 to 0.5 Easy several inches by thumb cm
<br /> —
<br /> r= trace of clay;wet;numerous organics and 4 to 8 Medium stiff 0.25 to 0.5 0.5 to 1 Moderate several inches by thumb =
<br /> strong organic odor;(Marsh Deposits)ML. 8 t015 Stiff 0.5 to 1 1 to 2 Readily indented by thumb =
<br /> r"3 Loose and soft,mottled black and green, 15 to 30 Very stiff 1 to 2 2 to 4 Readily indented by thumbnail _
<br /> silty SAND and clayey SILT;moist Over 30 Hard >2 >4 Difficulty by thumbnail —
<br /> hydrocarbon sheen and faint hydrocarbon
<br /> }", d , Fiq SM/ML —
<br /> STRUCTUREk.
<br /> r TERM THICKNESS YI�B� TYPICAL DESCRIPTION 3 —
<br /> MAJOR DIVISIONS S =
<br /> _
<br /> Parting 0 to 1116" Well-Graded Gravels,Gravel-Sand Mixtures, _
<br /> Clean Gravels GW
<br /> af
<br /> Seam 1/16#0 1/2" Gravels (less than Little or No Fines 4
<br /> Layer >1/2" (more than 50% 5%fines) GP goody-Graded Gravels,Gravel-Sand Mixtures =
<br /> Lamination <6 mm,<1/4" of coarse fraction
<br /> Gravels with Fines GM
<br /> on Silty Gravels,Gravel-Sand-Silt Mixtures _
<br /> Pocket Irregular,<1 foot retained
<br /> G; Varved Alternating seams or lam. Coarse-Grained No.4 sieve) (more than =
<br /> Soils 12%fines) GC Clayey Gravels,Gravel-Sand-Clay Mixtures
<br /> Occasional <1 per foot —
<br /> (more than 50% 6 =
<br /> Frequent >_1 per foot SW Well-Graded Sands,Gravelly Sands, —
<br /> �, retained on —
<br /> No.200 sieve) Clean Sands Little or No Fines
<br /> DESCRIPTION CRITERIA,LIST THICKNESS Sands =
<br /> (less than
<br /> {50%or more of 5%fines Poorly-Graded Sands,Gravelly Sands, 7 =
<br /> Stratified Alternating layers ) St' —
<br /> �� coarse fraction Little or No Fines --
<br /> Interbedded Alternating layers>1/2" [Use Dual passes the =
<br /> ' Y Symbols No.4 sieve Sands with Fines SM Silt Sands,Sand-Sift. =
<br /> _ Laminated Alt.layers<6�mm thick S bols for ) Y g =
<br /> Fractured Breaks easily along 5 to 12%Fines (more than =
<br /> definite fractured planes (i-e_GP-GM)] 12%fines) SC Clayey.Sands,Sand-Clay Mixtures
<br /> Slickensided Polished,glossy,striated Inorganic Silts and Very Fine Sands,Rock Flour, g
<br /> r
<br /> fractured planes ML Silty or Clayey Fine Sands or Clayey Silts with =
<br /> Blocky,Diced Easily breaks into small Slight Plasticity —
<br /> Silts and Clays inorganic �0_
<br /> � angular lumps (liquid limit Inorganic Clays of Low to Medium Plasticity, —
<br /> CL Gravelly Clays,Sandy Clays,Silty Clays,
<br /> Lensed Small pockets of diff.soils less than 50) Lean Clays —"
<br /> Homogenous Same color and Y
<br /> appearance throughout Fine-Grained Organic Silts and Organic Silty Clays of
<br /> Soils Organic OL =
<br /> Sheared Disturbed texture,mix of (50%or more low Plasticity =
<br /> ;w
<br /> strengths passes the
<br /> Inorganic Clays of Medium to High Plasticity, 12—
<br /> No.200 sieve) CH =
<br /> £� ORGANIC CONTENT Sandy Fat Clay,Gravelly Fat Clay =
<br /> ADJECTIVE PERCENT BY VOLUME Inorganic
<br /> Silts and Clays Inorganic Silts,Micaceous or Diatomaceous Fine 13
<br /> MH
<br /> Occasional 0 to 1 (liquid limit Sands or Silty Soils,Elastic Sift —
<br /> 7.7 Scattered 1 to 10 50 or more)
<br /> 40 Numerous 10 to 30
<br /> Organic Clays of Medium to High Plasticity, 14
<br /> Organic 30 to 50,minor constituent Organic OH Organic Silts
<br /> O
<br /> r'9 —
<br /> PEAT 50 to 100,MAJOR coast. Peat Humus Swam Soils with High Organic
<br /> Highly Organic Primarily organic matter,dark P g15_
<br /> Describe type and size of organic debris. Soils in color,and organic odor PT Content(See D 4427 92)
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