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BRAU N <br />INTERTEC <br />The I1rJenoa You D.W Om. <br />Criteria for Assigning Group Symbols and <br />Soil Classification <br />Group <br />S mbol <br />Group Name <br />Group Names Using Laboratory Testsn <br />Gravels <br />Clean Gravels <br />C">-4 and 15Cc53° <br />GW <br />Well -graded gravel` <br />(More than 50%of <br />(Less than 5%finesc) <br />C"<4and/or (C,< 1 or Cr> 3)° <br />GP <br />Poorly graded gravel' <br />c <br />coarse fraction <br />retained on No. 4 <br />Gravels with Fines <br />Fines classify as MILor MH <br />GM <br />Silty gravel' Pe <br />Fines Classify as CL or CH <br />GC <br />Clayey gravel'PG <br />c <br />sieve) <br />(More than 12%finesc) <br />00 <br />a <br />Sands <br />Clean Sands <br />C">- 6 and 15 Cr<- 3° <br />SW <br />Well -graded sand' <br />d <br />f° z <br />o w <br />(50%or more coarse <br />(Less than 5%fines") <br />C" <6 and/or (Cr<1 or Cr> 3)° <br />SP <br />Poorly graded sand <br />u E <br />fraction passes No. 4 <br />Sands with Fines <br />Fines classify as MIL or MH <br />SM <br />Silty sandPGl <br />,.. <br />sieve) <br />(More than 12%fines") <br />Fines classify as CL or CH <br />SC <br />Clayey sand°G1 <br />PI > 7 and plots on or above "A" line' <br />Lean clayK L M <br />Silts and Clays <br />Inorganic <br />PI < 4 or plots below "A" line <br />SiltKLM <br />(Liquid limit less than <br />Organic <br />Liquid Limit -oven dried <br /><0.75 <br />OL <br />Organic clay K LMN <br />o <br />50) <br />w ww <br />o <br />Liquid Limit - not dried <br />Organic silt K L Mo <br />eo E oN <br />PI plots on or above "A" line <br />Fat clayK L M <br />u o d <br />z <br />Silts and Clays <br />Inorganic <br />PI plots below "A" line <br />MH <br />KLM <br />Elastic silt <br />LL o <br />(Liquid limit 50 or <br />Organic <br />Liquid Limit -oven dried <br /><0.75 <br />OH <br />Organic clay K L MP <br />more) <br />Liquid Limit -not dried <br />Organic silt K L M ° <br />Highly Organic Soils <br />Primarily organic matter, dark in color, and organic odor <br />PT <br />Peat <br />A. Based on the material passing the 3-inch (75-mm) sieve. <br />B. If field sample contained cobbles or boulders, or both, add "with cobbles or boulders, <br />or both" to group name. <br />C. Gravels with 5 to 12% fines require dual symbols: <br />GW-GM well -graded gravel with silt <br />GW-GC well -graded gravel with clay <br />GP -GM poorly graded gravel with silt <br />GP -GC poorly graded gravel with clay <br />D. Cu = D60 / Dto Cr = (D30)z / (Dio x D6o) <br />E. If soil contains>-- 15% sand, add "with sand" to group name. <br />F. If fines classify as CL-ML, use dual symbol GC -GM or SC-SM. <br />G. If fines are organic, add "with organic fines" to group name. <br />H. Sands with 5 to 12%fines require dual symbols: <br />SW-SM well -graded sand with silt <br />SW -SC well -graded sand with clay <br />SP-SM poorly graded sand with silt <br />SP-SC poorly graded sand with clay <br />I. If soil contains>-- 15%gravel, add "with gravel" to group name. <br />J. If Atterberg limits plot in hatched area, soil is CL-ML, silty clay. <br />K. If soil contains 15 to < 30% plus No. 200, add "with sand" or "with gravel", whichever is <br />predominant. <br />L. If soil contains 30% plus No. 200, predominantly sand, add "sandy" to group name. <br />M. If soil contains>-- 30% plus No. 200 predominantly gravel, add "gravelly" to group name. <br />N. PI >- 4 and plots on or above "A" line. <br />O. PI <4 or plots below "A" line. <br />P. PI plots on or above "A" line. <br />Q. PI plots below "A" line. <br />60 <br />40 <br />g 20 <br />a <br />For classification of fine-grained soils <br />and fine-grained fraction of coarse -grained <br />' <br />Spls <br />Equation of "A" - line <br />Horizontal at Pt = 4 to LL - 25.5, <br />then Pt = 0.73 (LL - 20) <br />g <br />Equation of "U" - line <br />Vertical at LL - 16 to Pt - <br />then PI = 0.9 (LL - a) <br />V <br />V <br />0, <br />MH OH <br />to <br />7 <br />4 <br />00 <br />10 16 20 30 40 50 W 70 g0 90 too 110 <br />LIQUID LIMIT (LL) <br />Descriptive Terminology of Soil <br />Based on Standards ASTM D2487/2488 <br />(Unified Soil Classification System) <br />Particle Size Identification <br />Boulders .............. <br />over 12" <br />Cobbles ................ <br />3" to 12" <br />Gravel <br />Coarse ............. <br />3/4" to 3" (19.00 mm to 75.00 mm) <br />Fine ................. <br />No. 4 to 3/4" (4.75 mm to 19.00 mm) <br />Sand <br />Coarse .............. <br />No. 10 to No. 4 (2.00 mm to 4.75 mm) <br />Medium ........... <br />No. 40 to No. 10 (0.425 mm to 2.00 mm) <br />Fine .................. <br />No. 200 to No. 40 (0.075 mm to 0.425 mm) <br />Silt ........................ <br />No. 200 (0.075 mm) to .005 mm <br />Clay ...................... <br /><.005 mm <br />Relative Proportions',"' <br />trace ............................. 0 to 5% <br />little .............................. 6 to 14% <br />with .............................. >-15% <br />Inclusion Thicknesses <br />lens ............................... 0 to 1/8" <br />seam ............................. 1/8" to 1" <br />layer .............................. over 1" <br />Apparent Relative Density of Cohesionless Soils <br />Veryloose ..................... <br />0 to 4 BPF <br />Loose ............................ <br />5 to 10 BPF <br />Medium dense .............. <br />11 to 30 BPF <br />Dense ............................ <br />31 to 50 BPF <br />Very dense .................... <br />over 50 BPF <br />Consistency of <br />Blows Approximate Unconfined <br />Cohesive Soils <br />Per Foot Compressive Strength <br />Very soft ................... <br />0 to 1 BPF................... <br />< 0.25 tsf <br />Soft ........................... <br />2 to 4 BPF................... <br />0.25 to 0.5 tsf <br />Medium .................... <br />5 to 8 BPF .................. <br />0.5 to 1 tsf <br />Stiff ........................... <br />9 to 15 BPF................. <br />1 to 2 tsf <br />Very Stiff ................... <br />16 to 30 BPF............... <br />2 to 4 tsf <br />Hard .......................... <br />over 30 BPF................ <br />> 4 tsf <br />Moisture Content: <br />Dry: Absence of moisture, dusty, dry to the touch. <br />Moist: Damp but no visible water. <br />Wet: Visible free water, usually soil is below water table. <br />Drilling Notes: <br />Blows/N-value: Blows indicate the driving resistance recorded <br />for each 6-inch interval. The reported N-value is the blows per <br />foot recorded by summing the second and third interval in <br />accordance with the Standard Penetration Test, ASTM D1586. <br />Partial Penetration: If the sampler could not be driven <br />through a full 6-inch interval, the number of blows for that <br />partial penetration is shown as #/x" (i.e. 50/2"). The N-value is <br />reported as "REF" indicating refusal. <br />Recovery: Indicates the inches of sample recovered from the <br />sampled interval. For a standard penetration test, full recovery <br />is 18", and is 24" for a thinwall/shelbytube sample. <br />WOH: Indicates the sampler penetrated soil under weight of <br />hammer and rods alone; driving not required. <br />WOR: Indicates the sampler penetrated soil under weight of <br />rods alone; hammer weight and driving not required. <br />Water Level: Indicates the water level measured by the <br />drillers either while drilling ( Q ), at the end of drilling ( 3E), <br />or at some time after drilling ( M). <br />Laboratory Tests <br />DD Dry density, pcf qP Pocket penetrometer strength, tsf B WD Wet density, pcf q0 Unconfined compression test, tsf <br />P200 % Passing #200 sieve LL Liquid limit I� <br />MC Moisture content, % PL Plastic limit <br />OC Organic content, % PI Plasticity index <br />Sample symbols <br />Standard Penetration Test D Rock Core <br />Modified California (MCI . Thlnwall ITW)/Shelby Tube (SH) <br />Auger ® Texas Cone Penetrometer <br />Grab Sample to Dynamic Cone Penetrometer <br />5/2021 <br />