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d <br /> o <br /> 4rr DESCRIPTION MAJOR DIVISIONS <br /> to <br /> IV GW WELL GRADED GRAVELS, GRAVEL- <br /> SAND MIXTURES GRAVEL <br /> ,4 CLEAN GRAVELS WITH AND <br /> ' ' pe LESS THAN 5% FINES GRAVELLY <br /> p GP POORLY GRADED GRAVELS, SOILS w <br /> • GRAVEL-SAND MIXTURES w <br /> sQs H <br /> N <br /> SILTY GRAVELS, GRAVEL-SAND- m <br /> GM SILT MIXTURES a <br /> ' GRAVELS WITH MORE THAN 50% N <br /> J <br /> MORE THAN 12% FINES OF COARSE FRAC- c <br /> CLAYEY GRAVELS, GRAVEL-SAND- TION RETAINED N z <br /> GC CLAY MIXTURES ON NO. 4 SIEVE w <br /> z <br /> H � <br /> a WELL GRADED SANDS, Lo w <br /> o SW GRAVELLY SANDS SANDS w <br /> ' CLEAN SANDS WITH ANDN <br /> LESS THAN 5% FINESSANDY N <br /> SP POORLY GRADED SANDS, SOILS v z <br /> GRAVELLY SANDS = <br /> N W <br /> SILTY SANDS, SANO -SILT a <br /> SM MIXTURES MORE THAN 50% Z <br /> SANDS WITH OF COARSE FRAC- <br /> MORE THAN 12% FINES TION PASSING <br /> Sc CLAYEY SANDS, SAND- NO. 4 SIEVE <br /> CLAY MIXTURES <br /> z z INORGANIC SILTS, ROCK FLOUR, <br /> ' U ML OR CLAYEY SILTS WITH SLIGHT � <br /> w ¢ PLASTICITY H <br /> INORGANIC CLAYS OF LOW TO <br /> MEDIUM PLASTICITY, GRAVELLY LIQUID LIMIT SILTS m <br /> CL CLAYS, SANDY CLAYS, SILTY LESS THAN 50 AND ou <br /> CLAYS <br /> CLAYS, LEAN CLAYS vs o <br /> H z <br /> ' ORGANIC SILTS AND ORGANIC 0 ¢ <br /> OL SILTY CLAYS OF LOW PLASTICITY <br /> D <br /> H W <br /> INORGANIC SILTS, MICACEOUS ¢ J <br /> MH OR DIATOMACEOUS SILTS, <br /> ELASTIC SILTS w cry <br /> z <br /> ' LL H <br /> INORGANIC CLAYS OF HIGH LIQUID LIMIT SILTS to <br /> AND z <br /> CH PLASTICITY, FAT CLAYS <br /> GREATER THAN SO <br /> CLAYS <br /> ORGANIC CLAYS AND ORGANIC SILTS � <br /> OH OF MEDIUM TO HIGH PLASTICITY s <br /> PEAT, HUMUS, SWAMP SOILS <br /> • PT WITH HIGH ORGANIC CONTENT HIGHLY ORGANIC SOILS <br /> ■Geotechnical <br /> UNIFIED SOIL CLASSIFICATION SYSTEM <br /> PLATE 3 <br />