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UNIFIED SOIL CLASSIFICATION (ASTM D-2487/2488) <br />MATERIAL <br />CRITERIA FOR ASSIGNING SOIL GROUP NAMES <br />GROUP <br />SOIL GROUP NAMES & LEGEND <br />TYPES <br />SYMBOL <br />GRAVELS <br />CLEAN GRAVELS <br />Cu>4 AND 1<Cc<3 <br />GW <br />WELL -GRADED GRAVEL <br />4 A. .� <br />J <br />° <br />>50 /o OF COARSE <br /><5% FINES <br />Cu>4 AND 1>Cc>3 <br />GP <br />POORLY -GRADED GRAVEL <br />o 0 <br />o � o <br />Z <br />FRACTION RETAINED <br />0Llio <br />ON NO 4. SIEVE <br />GRAVELS WITH FINES <br />FINES CLASSIFY ASMLORCL <br />GM <br />SILTY GRAVEL <br />o ° <br />o <br />w Lu w <br />>12% FINES <br />Z z Cn <br />FINES CLASSIFY AS CL OR CH <br />GC <br />CLAYEY GRAVEL <br />O <br />o 0 0 0 0 0 <br />� �`! <br />SANDS <br />CLEAN SANDS <br />Cu>6 AND 1 <Cc<3 <br />SW <br />WELL -GRADED SANDLli <br />0 0 0 0 0 0 <br />Cu>6 AND 1>Cc>3 <br />SP <br />POORLY -GRADED SAND <br />U) 0� o z <br /><5% FINES <br />A <br />>50% OF COARSE <br />FINES CLASSIFY AS ML OR CL <br />SM <br />SILTY SAND <br />CU <br />FRACTION PASSES <br />ON NO 4. SIEVE <br />SANDS AND FINES <br />>12% FINES <br />FINES CLASSIFY AS CL OR CH <br />SC <br />CLAYEY SAND <br />SILTS AND CLAYS <br />PI>7 AND PLOTS>"A" LINE <br />CL <br />LEAN CLAY <br />INORGANIC <br />PI>4 AND PLOTS<"A" LINE <br />ML <br />SILT <br />J <br />00 LJ <br />LIQUID LIMIT<50 <br />W >LIJ <br />ORGANIC <br />LL (oven dried)/LL (not dried)<0.75 <br />OL <br />ORGANIC CLAY OR SILT <br />= <br />o U) U) <br />Zao <br />— — <br />o No <br />SILTS AND CLAYS <br />PI PLOTS >"A" LINE <br />CH <br />FAT CLAY <br />o O <br />w"0000 <br />INORGANIC <br />PI PLOTS <"A" LINE <br />MH <br />ELASTIC SILT <br />Z <br />LIQUID LIMIT>50 <br />_u <br />ORGANIC <br />LL (oven dried)/LL (not dried)<0.75 <br />OH <br />ORGANIC CLAY OR SILT <br />HIGHLY ORGANIC SOILS <br />PRIMARILY ORGANIC MATTER, DARK IN COLOR, AND ORGANIC ODOR <br />PT <br />PEAT <br />SAMPLE TYPES <br />D <br />:v <br />Relative Proportions of Sand and Gravel <br />TERM <br />PERCENT <br />Trace <br />< 15 <br />With <br />15 - 29 <br />Modifier <br />> 30 <br />Relative Proportions of Fines <br />TERM <br />PERCENT <br />Trace <br />< 5 <br />With <br />5-12 <br />Modifier <br />> 12 <br />Grain Size Terminology <br />TERM <br />SIZE <br />Boulder <br />< 12 in. <br />Cobble <br />3 in. - 12 in. <br />Gravel <br />#4 sieve to 3 in. <br />Sand <br />#200 sieve to #4 sieve <br />Silt or Clay <br />Passing #200 sieve <br />mHollow Stem <br />® Standard Penetration Test <br />TEST SYMBOLS <br />MC - MOISTURE CONTENT <br />LL - <br />LIQUID LIMIT <br />OC - ORGANIC CONTENT <br />PI - <br />PLASTISITY INDEX <br />CN - CONSOLIDATION <br />SW - <br />SWELL TEST <br />DD - DRY DENSITY <br />UU <br />Unconsolidated Undrained triaxial <br />PP - <br />POCKET PENETROMETER <br />RV - <br />R-VALUE <br />SA - <br />SIEVE ANALYSIS <br />P200 - <br />% PASSING #200 SIEVE <br />Z WATER LEVEL (WITH TIME OF) <br />n <br />PLASTICITY CHART MEASUREMENT <br />Z 80 <br />ji <br />ji ji 70 <br />Z <br />< 60 <br />ji Y =- <br />w 50 <br />_Z <br />40 <br />Y ~ <br />U <br />i U) 30 <br />_Y < <br />o_ 20 <br />Y <br />1J <br />ZI 10 <br />ji <br />J <br />ji <br />PENETRATION RESISTANCE <br />(RECORDED AS BLOWS / 0.5 FT) <br />SAND & GRAVEL <br />SILT & CLAY <br />COMPRESSIVE <br />RELATIVE DENSITY <br />BLOWS/FOOT* <br />CONSISTENCY <br />BLOWS/FOOT* <br />STRENGTH (TSF) <br />VERY LOOSE <br />0-4 <br />VERY SOFT <br />0-1 <br />0 - 0.25 <br />LOOSE <br />4-10 <br />SOFT <br />2-3 <br />0.25 - 0.50 <br />RATHER SOFT <br />4-5 <br />0.50 - 1.0 <br />MEDIUM DENSE <br />10-30 <br />MEDIUM <br />6-8 <br />DENSE <br />30-50 <br />RATHER STIFF <br />9-12 <br />1.0 - 2.0 <br />STIFF <br />13 - 16 <br />VERY DENSE <br />OVER 50 <br />VERY STIFF <br />17 - 30 <br />2.0 - 4.0 <br />HARD <br />OVER 30 <br />OVER 4.0 <br />�/ IVVIVIVLI\ VI VLVVVV VI ITV LV 11l11 V11 VILI\1 /-1LL11VV JV IIVVIILV 1 V VI\IVLIIL IIYV11 V•V <br />0 10 20 30 40 50 60 70 80 90 100 110 120 (1-3/8 INCH I.D.) SPLIT -BARREL SAMPLER THE LAST 12 INCHES OF AN 18-INCH DRIVE <br />LIQUID LIMIT (%) (ASTM-1586 STANDARD PENETRATION TEST). <br />Y <br />Z <br />Chosen Valley Testing LEGEND TO SOIL <br />D DESCRIPTIONS <br />Job No. 16987.20.MNR <br />