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Soil Classification Standard Operating Procedure SWE-FSOP-201;Revision 0 Ahtna Southwest Environmental Operations STEP 1; UNIFIED SOIL CLASSIFICATION SYSTEM IS SEDIMENT FOR COMMON INORGANIC AND ORGANIC SEDIMENTS COARSE GRAM-- Modred hom ASTM OR STEP 2:DETERMINE SAND VS.GRAVEL RATIO FINE 0— STEP 3: } N C R E A S I N G G R A I N S 1z I- CPrrrrw/ Wu SAND 7MIN GRE -&+H�•PR'BRAYEL• aA.m pp.[vw cLvw cwnrrr COARSE-GRAINER DEPQSI1 S OASS 6NA ORPIRSYAf89s 1 r5p coer"a".-50%Rrw sedirnantsj - t' A AneolrPMAJA 11 GROUP SYMBUI_ GROUP NAME weep _ ct5%wnd WELL GRADED GRAVEL '"fide. i -,F nmt "+snood�WELL GRADED GRAVEL WITH SAND Prrorry ce GP tt5%sand POORLY GRADED GRAVEL [ul "15%send POORLY GRADED GRAVEL WfTH SAND Prvptasnchnes 1 GW.Gm `+s%'ww WELL GRADED GRAVEL WITH SILT Weagraded a1591sand�►WELL GRADED GRAVEL WITH RI LT AND SAND irwrr-vr�irP`"'1 Nanirrmer [iWAC a+4.,nj WELL GRADED GRAVEL WITH CLAY Gravel "I3%ond WELL GRADED GRAVEL WITH CLAY AND SAND os nnrs (gravel>santll 5%sand�POORLY GRADED GRAVEL WITH SILT nervpl�ncfines GP-Gm "19ksaM POORLY GRADED GRAVEL WITH SILT AND SAND P°erly gratlea plasrlcrin,—►GP-GC�cls+6aand�F POORLY GRADED GRAVEL WITH CLAY "ssra sand POORLY GRADED GRAVEL WITH CLAY AND SAND non-Wane fines---f am— y:,IS%vind SILTY GRAVEL `5%rasa �SILTY GRAVEL WITH SAN13 Is,fines 115%dnd --CLAYEY GRAVEL prrua rine: GC r1S%Ond 0 CLAYEY GRAVEL WITH SAND well graded cr5%g-m�WELL GRADED SAND c sAnr,.t {well vMrml wm,i�WELL GRAD EA SAND WITH GRAVEL YvPdrsrrded SP i Sty"'M~POORLY GRADE4 SAND lunlfomrl "1S%gr m�POORLY GRADED SAND WFTH GRAVEL enplasncfinci SW-SiMs115%g,&O�WELL ORADEbSAN DMTNSILT r1Lfr ellyr.a.d �5%9revel WELL GRADED SAND WITH SI LT AND GRAVEL W <f—W."n' C�p�rrKfi Sri�C WELL GRADED SAND WITH CLAY Sand +a%r yrs%yr.ve WELL GRADED SAND WITH CLAY AND GRAVEL °n-pt°,urrtnes--f SP-SM e1s%9-1 POORLY GRADED SAND WITH SIT {sand>grave3j y�aed °+59n 9,,.-1�POORLY GRADED SAND WITH SILT AND GRAVEL prr�.rml <arc f,,.r T'SPSC et5ri gravN—POORLY GRADED SAND WITH CLAY °1s*g%W--------I-POORLY GRADED SAND WITH CLAY AND GRAVEL non-plas+lcf—--I.SM �15%vnmi SILTY SAND .t;s,lines ats%er vel =SILTY SAND WITH GRAVEL panic fines $G ri s9sgmmi CLAYEYSAND "is*grrm�CLAYEY SAND WITH GRAVEL STEP 2;DETERMINE PLASTIC ITY AND ASSIGN USCS GROUP SYM5OL I N C R E A S I N G P L A S 1 i G I T 7' STEP 3. _ cvnrdrue wir>i FINE-GRAINED DEPOSITS Na Pusnc Low PL IIGITV MMUM PLRS?ICITY iii a1I P"STICM. v Opsymf I�50%flms.=50%Cha rye-gra lnod wa lments} ANO fOLLOw FLV W CHART [i_ LH TOASSrGNAOROOPMAME STEP 4: DOES❑RGANiCCnNTEN7 GROUP NAME INFLUENG. less than 317%Coarse <15%Coarse-Grained Sediment 11` SILT V 7 <GFain', � %sand x'16 gravel 31 SILT MTN SAND 15-25%[varsrGrainetl 5edlmen[ �y%sand a%gravrel ---P SILT WITH GRAVEL ML c15%gravel SANDY SILT more than 30%Ct %sand" gravel gravel ,'15% 0 SANDY SILT WITH GRAVEL Grained Sediments c15%sand - -0'GRAVELLY SILT %sandy%gravel —�.X15%sand GRAVELLY SILT WITH SAND LsS than 30%Coarse �IS%Coarse-Grained 5edlment �LEAN CLAY Grained Sediments 15-YS%Coarse-Gralncd Sediment %sand s%gravel �I LEAN CLAY WITH SAND CL %Sandi%gravel 11 LEAN CLAY WITH GRAVEL %sand %Ol gravel c1i4'grau� SANDY LEAN CLAY morethan 30%Coar" >15%gravel �►SANDY LEAN CLAY WIT"GRAVEL GralneW Sediments 115%sand IN GRAVELLY LEAN CLAY %sand c%gravel -------- }15%sand 1 GRAVELLY LEAN CLAY WITH SAND loss than 30%(Mine {15%Cvar5e- MVIed Sediment FAT CLAY Grained Sediments -C-11, 96 sand s%gravel �10 FAT CLAY W4H SAND 15-Z S%COa+se-Grained Sediment CH °0 sand %gravel 0 FA7 CLAY WITH GRAVEL 96 sand 95 of gravel <1S%gravel SANDY FAT CLAY more rhan30%Cvarse )1596gravel I SANDY FAT CLAY WITH GRAVEL Grained Sediments ��a15%sand 0 GRAVELLY FAT CLAY %sand<%gravel ?15%sand ��GRAVELLY FAT CLAY WITH SAND less than 30%Coarse {15%Coarse-GrainedSediment ORGANIC SOIL Grained Sedirnenls %sand x%gravel ��IN ORGANIC SOIL WITH SAND 15•-25%Coarse-Grained Sediment —�ORGANIC SOIL WITH GRAVEL OL I OH c%gravel %sand g%oi gravel X15%gravel �SANDY ORGANIC SOIL more 3096 Coars %sand e 215%gravel — P SANDY ORGANIC SOIL WITH GRAVEL Grained Sediments �K15%sand IF GRAVELLY ORGANIC SOIL ASTM charts reprinied with permission %Sand<%gravel a15%Sand �GRAVELLY ORGANIC SOIL WiTH SAND For Additional Copies:go W midwestgea.cum Made in the USA 012001.2020 midwest geosclences group press Figure 2—Unified Soil Classification S 1 Page 11 of 11