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PENN No. 1215 UNIFIED SOIL CLASSIFICATION SYSTEM (ASTM D-248 Group Field Identification symbols Typical Names Laboratory Classification Criteria Clan GW Well-graded gravels, gravel-sand y o Cu-Da, . D„ z 4 and mixtures,little or no tines. p m Cc=(D 0)2 (D„x D.)) i 1 & s 3 GRAVELS Gravels GP Poorly graded gravels,gravel- 2 2 c Cu=D * D,o<4 and/or `$x F},.. sand mixtures, little or no fines, z kn c7 m 47 Cc-(Dao) r(D,o x D.)< 1 &>3 y y � More than 50% a J � a, O z H coarse fraction Gravels Silty gravels, poorly graded y Q U)U�'o Fines classify as N g o VAth GM gravel-sand-silt mixtures. ie O m-=. V ML or MH. If fines classify as retained on the Fines y > > CL-ML,use dual d E g' Clayey gravels, poorly graded -' w `� B Q o Fines classify as d No.4 sieve. >12%Fins gravel-sand-clay mixtures. S o symbol GC/GM. . e z Y a CL or CH. C7 , Clean SW Well-graded sands,gravelly 0 W cu=D,, . 010 2 s and ' Q c Sands sands, little or no fines. O M Cc=(D„)2 (D,o x D.) i 1 & s 3 a SANDS Poorly graded sands, gravelly z w U 2 0 Cu-D +D„<6 and/or m `6x FtnK SP sands, little or no fines. F a a a a Cc=(D„) +(D„x D,o)< 1 &>3 o More than 50% V m SandsSiltSilty sands, poorly graded sand- V :� c7 kn(n Fines classify as coarse fraction n o` o` `o � If nes classify as Silt mixtures. ML or MH. fi passes the No. 4 Fines rn O CL-ML, use dual SC Clayey sands, poorly graded y � �� Fines dassity as slave. >12%Fin” vim+ ;rend-day mixtures. � � 3 3 3� CL or CH. symbol SCISM. V W, c7 t.7 rn(0 Identification Procedures on Percentage Passing the No.40 Sieve. PLASTICITY CHART Inorganic silts, very fine sands, ML rock flour, silty or dayey fine For Classification of Fine-Grained Soils and Fine-Grained sands with slight plasticity. Fraction of Coarse-Grained Soils. y m > SILTS & CLAYS Inorganic days of low to medium Equation d W-t kw- PI.4 O LL=4 to 25.5,th«,Pi=0.73.(LL-20). C m W Liquid Limit less CL plasticity, gravelly,sandy, and/or Equation d'U'lJna: LL=18 O PI=0 l0 7,than PI=0.9.(LL-9). ca E $ than 50% silty days, lean days. 60 c o o Organic silts, organic silty days of 50 A fA 8 z OL low plasticity. x CM aro C7 0 5 Inorganic silts, micaceous or o to m MH diatomaceous fine sandy/silty ? / c o y SILTS & CLAYS soil, elastic silts• CLorOLZ CH Inorganic days of high plasticity, 0 2 Liquid Limit greater fat days. to ray 0111 1 than 50% OH Organic days of medium to high 'g10-411-1 1 plasticity. Moroi- HIGHLY and other highly organic ° 10 20 30 40 50 70 80 90 100 tto HIGHLY ORGANIC SOILS PT soils LIQUID LIMIT(LL) KEY TO SAMPLER TYPES & SAMPLE INTERVALS KEY TO OTHER LOG SYMBOLS MC Modified California Sampler. Depth at Which Groundwater was Encountered During Drilling. SC Standard California Sampler. Depth at Which Groundwater was Measured After Drilling. SPT Standard Penetration Test Sampler. Ou Unconfined Compression Test. P Dames&Moore Piston Sampler. PTV Pocket Torvane Test B Bag or Bulk Sample. 4200 Amount of Material Rner Than The No.200 Sieve Test. ■ Undisturbed Sample Recovered. LL Liquid Limit of Sample. ® Disturbed Sample Recovered. PL Plastic Limit of Sample. No Sample Recovered. PI Plasticity Index of Sample. rqSPT Sample Recovered. UNIFIED SOIL CLASSIFICATION SYSTEM FIGURE No. 7 AND KEY TO BORING LOGS