Geotechnical exploration/review-2008

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f I 1laUNIFIED SOIL CLASSIFICATION SYSTEM AMERICAN ASTM Designations:D 2487,D2488 ENGINEERING TESTING,INC. �a Soil Classification lifal Criteria for Assigning Group Symbols and Group Names Using Laboratory Tats" Group Group Name' "Baud on the material passing the 3-in Symbol (15-mm)sieve. Coarse-Grained Gravels More Clean Gravels Cu>4 and 1<Cc<3" GW Well graded gravel' If field sample contained cobbles or Soils More than 50%coarse Less than 5% boulders,or both, add"with cobbles or than 50% fraction retained finesc Cu<4 and/or 1>Cc>3L GP Poorly graded gravel boulders,or both"to group name. retained on on No.4 sievecGravels with 5 to 12%fires require dual No.200 sieve Gravels with Fines classify as ML or MN GM Silty gravel" symbols: Fines more OW-GM well-graded gravel with silt than 12%fines c Fines classify as CL or CH GC Clayey gravel''r' GW-GC well-graded gravel with clay GP-GM poorly graded gravel with silt Sands 50%or Clean Sands Cu>6 and l<Cc<3k SW Well-graded sand' GP-GC poorly graded gravel with clay more of coarse Less than 5% °Sands with S to 12%fines require dual faction passes fines° Cu<6 and 1>Ce>3° SP Poorly-graded sand' symbols: No.4 sieve SW-SM well-graded sand with silt Sands with Fines classify as ML or MH SM Silty sand' SW-SC well-graded sand with clay Fines more SP-SM poorly graded sand with silt than 12%Imes D Fines classify as CL or CH SC Clayey sand`r u SP-SC poorly graded sand with clay Fine-Grained Silts and Clays inorganic Pl>7 and plots on or above CL Lean clay" Soils 50%or Liquid limit less "A"liter (D,02 more passes than 50 Pl<4 or plots below ML Silt' leu..Drs/Dino. Cc the No.200 "A"line Dior D60 sieve organic Liquid limit-oven dried<0.75 OL Organic clay'''. Ylf sod (see Plasticity Liquid limit-not dried Organic sihcs,si°• containsadd"with Liquid Chart below) °If fines classify as CL-ML,use dual Silts and Clays inorganic PI plots on or above"A"line CH Fat clay1L6 symbol GC-GM,or SC-SM. Liquid limit 50 "lf lues are organic,add"with organic • or more P1 plots below"A"line MH Elastic silt' fps"to group name. 'lfsoil contains>15%gravel,add"with organic L.iauid limit-oven dried<0.75 OH Organic clay'''. braver to group name. 'If Atserberg limits plot is hatched area, . Liquid limit-not dried Organic nitwit/ soils is a CL-ML silty clay. Highly organic Primarily organic matter, dark PT Pat" KIf soil contains 15 to 29%plus No.200 add"with soil in color,and organic in odor sand"or whichever is roan graver, t. 'If soil contains No.200, OM ANALYSIS 'predominantly sand,add "sandy"to F...o...a►j--Ne""r"--I group name. tf l i " 1 i >0 4 A ion p a- i wlf soil containns�,>30%pl s No.200, c` t Iou.al ,*+*" � predominantly tom,add "gravelly" O m as WWI/073 wail I:)\\ • to group name. � ve°.6ld+u,SiarR.s i t 14P1>4 end plots on or above"A"line. 0 6.15.. eR-aa6m q °P1<4 or plots below"A"lute. '0 n / '11 plots on or above A"line. QPI plots below'A*line. I • •n.•2ew mr fi /Tiber Cornea description shown below. a o I 0 al .0 .tet to 4 ,o ao eb 70 b lib .tie flet • PARTO.E WE N 141,1110 1918 ntpuoUMT(W ...t.r.a �.a. ',ts•u - Plasticity Chart • t ADDlTIONA14 TERMINOLOGY-,NOTES;USED BY.AE.FOR:SOIL.IDI]V17FIG4fl IiANBRE +' .!:!i:.:: 4 min Sirs Gravel Percentages Consistency of Plastic Sills Relative Density of Non-Plastic Soils 1 i..M Particle Size Inln MERE DOR $-Value.BPF ISg N-Value.BIT :. Boulders Over 12' A Little Gravel 3%-14% Very Soft less than 2 Very Loose 0-4 Cobbles 3'to 12' With Gravel 15%-29% Soft 2-4 Loose 5-10 --Gravel #4 sieve to 3" Gravelly 30%-SO% Firm 5-S Medium Dense 11-30 Sand #200 to#4 sieve Stiff 9-IS Dense 31-50 Fines(silt&clay) Pass#200 sieve Very Stiff 16-30 Very Dense Greater than SO Hard Grater than 30 Moisture/Frost Condition Levering Notes Fiber Contain of Peat Organic/Roots Description fif no lab tests) (MC Column) Laminations: Layers less than Fiber Content Soils are described as prsadc,if soil is not peat D(Dry): Abserse of moisture,dusty,dry to W thick of TSM [Visual Estimate) and is judged to have sufficient organic fines touch. differing material content to influence the soil properties. Sleigh, M(Moist): Damp,although five water not or color. Fibric Peat Greater than 67% oceanic used for borderline ass. visible. Soil may still have a high Hemic Peat: 33-67% water content(over"optimum"). Lenses: Pockets or layers Sapric Peat Less then 33% With roots: Judged to have sufficient quantity W(Wet/ Free water visible intended to greater than lb" of roots to influence the soil Waterbeering): describe non-plastic soils. thick of differing properties. Waterbearing usually relates to material or color. Trace roots: Small roots present,but not judged sands and sand with silt to be in sufficient quantity to F(Frozen): Soil frozen significantly affect soil properties. • -`O1CIS021(2/04) AMERICAN ENGINEERING TESTING,INC.