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MAJOR DIVISIONS SYMBOLSI TYPICAL SOIL DESCRIPTIONS <br /> (j`I{r Well graded gravels or gravel—sand matures little or no fines <br /> Is GRGRA=�LEEL�S� ' <br /> m GP i•,• Poorly groded gravels or gravel-sand mature$, Hilt• or no fines <br /> u] y f•'= <br /> .l (More than 1/2 of <br /> N IP <br /> On coarse fraction y GM Silty gravels, gravel-Sand-siII mixtures <br /> no 4 sieve size) Q <br /> N oa <br /> ZGCClayey gravels, gravel-sand-cloy mixtures <br /> ^ o, <br /> ao <br /> SW Well graded sands or gravelly sands, little or no fines <br /> 0 <br /> WN <br /> §ANDS <br /> QSP Poorly graded sands or gravelly sands, little or no fines <br /> ' 0 <br /> C.1� (More than 1/2 0l <br /> m <br /> C coarse traction < SM Silly sands sand-silt misture* <br /> 2 no 4 •ter• size, rr <br /> SC r Clayey sands sand-clay mxlures <br /> m Inorganic silts and very fine sand*, rack flour silty or clayey <br /> "''L I <br /> m fine sands or clayey silts with slight plasticity <br /> ? SILTS 8i CLAYS <br /> LD <br /> N CL Inorganic clays of low la,medium plasticity, gravelly ctays, <br /> 00 LL <50 sandy clays silly clays, Wan clays <br /> to eV ��- <br /> ' W e OL Organic sites and organic silty clays of low plasticity <br /> Z w <br /> MH illIl Inorganic silts, micaceaus or diatomaceous fine sandy or silly soils <br /> ILTS CLAYS III'I elastic slue <br /> IaJ 1, <br /> Z c CH Inorganic clays of high plasticity, fat clays <br /> >LL LL> 50 <br /> ' m Organic clays of medium to high plasticity, organic silty cloys, <br /> � Oki <br /> Organic sills <br /> HIGHLY ORGANIC SOILS P1 Peat and other highly organic soils <br /> I <br /> CLASSIFICATION CHART <br /> (Unllird Soil Classification System) <br />' CLASSIFICATION RANGE OF GRAIN SIZES so <br /> U S Standard Grain Size so <br /> Steve Size in Millimeters �, I CH <br /> LE <br /> BOULDERS Above 12Above 305 ? <br /> .p <br /> COBBLES 12" to 3" 305 to 76 2 '4 <br />' GRAVEL 3" to No 4 76 2 to 4 76 za Ct 0" <br /> CDOrSe 3' to 3/4- 76 2 to 19 ! _j o MH <br /> r <br /> fine 4 3/4' to NO g 19 E to 4 76 4 MLe OL <br /> - <br />' SAND No 4 10 No 200 4 76 10 0 074 °o w za 30 40 50 eo TO eo so 02 <br /> LOOrie No 4 to No IO 476 to 200 LIQUID LIMIT <br /> medium No 1010 No 40 200 to 0420 PLASTICITY CHART <br /> fine No 40 to No 200 0420 to 0074 <br /> SILT 9 CLAY Below No 200 Below 0074 <br /> GRAIN SIZE CHART ! 1 <br /> METHOD OF SOIL CLASSIFICATION , <br /> 1 <br /> fmcon <br /> � ASSOC !S <br />