1994 - Geotechnical Services Report

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CLASSIFICATION OF SOILS FOR ENGINEERING PURPOSES AMERICAN ENGINEERING ASTM Designation: D 2487 TESTING, INC. (Based on Unified Soil Classification System) Soil Classification Criteria for Assigning Group Symbols and Group Names Using Laboratory Tests' Group Group Name3 Symbol Coarse-Grained Soils Gravels Clean Gravels Cu_4 and 1Cc53c GW Well graded graver More than 50%retained on More than 50%coarse Less than 5% fines: No. 200 sieve fraction retained on Cu-44 and/or 1>Cc>3E GP Poorly graded gravel(' No.4 sieve Gravels with Fines Fines classify as ML or MH GM Silty gravel':' More than 12%fines: Fines classify as CL or CH GC Clayey graver:.°'H Sands Clean Sands Cu>6 and 1-Cc-s3` SW Well-graded sand' 50%or more of coarse Less than 5%fines° fraction passes No. Cush and/or 1>Cc,.33 SP Poorly graded sand' 4 sieve Sands with Fines Fines classify as ML or MH SM Silty sand•"•' More than 12%fines° Fines classify as CL or CH SC Clayey sand•~'i Fine-Grained Soils Silts and Clays inorganic PI>7 and plots on or above CL Lean clay<LM 50%or more passes the Liquid limit less than 50 "A"lines No. 200 sieve PI<4 or plots below"A" ML SiltK.LM lines organic Liquid limit•oven dried <0.75 OL Organic clayt'L'w.N Liquid limit-not dried Organic silt4A-At° Silts and Clays inorganic PI plots on or above "A" line CH Fat cfay'cLM Liquid limit 50 or more PI plots below"A"tine MH Elastic siltKLM organic Liquid limit•oven dried OH Organic c1ay<•LM.P <0.75 Liquid limit-not dried Organic silf<LM.o Highly organic soils Primarily organic matter.dark in color.and organic odor PT Peat "'lased on the material passing the 3-in.(75-m d sieve. (D l2 if Anerberg limns plot in hatched area.soil is a CL-ML. I 31f field sample contained cobbles or boulders.or both,add -Cu - 040 1010 Co . ji"0 t° silty clay. "with cobbles or boulders.or bot"to group name. ro Kit sod contains 15 to 29%plus No.200.add-with sane" :Gravels with 5 to 12%tines reauire dual symbols: "it soil contains>15%sand,add''with sand"to group or"with gravel."wnit never is predominant. GW-GM well graded gravel with silt name. lit sal containsZ30%plus no.200.predominantly sand. GW-GC-well-graded gravel with clay Gil fines classify as CL•ML,use dual symbol GC-GM.or add"sandy'"to to group name. GP GM poorly graded gravel with silt SC-SM. ui}soil contatnsl-30%plus No.200.predominantly GP-GC poorly graded gravel with clay 'Ill tines are organic.add"wit organic fines"to group gravel.add"gravelly"to group name. Sands with 5 to 12%fines require dual symbols: name. NPtb4 and pots on or above"A•'line. SW-SM well-graded sand with slit 'If soil contains?t5%gravel.add"wit gravel"10 group °PI<4 or plots below"A"line. SW-SC well-graded sand with clay name PPI plots on or above"A-line. SP-SM poorly graded sand with silt °PI pots below"A"line. SP-SC poorly graded sand with day SIEVE ANALYSIS 60 / SCREEN-IN SIEVE N0. fine-"rained far classification of ine 3roined soils loo 3 z +, 0 20 w so •o 200 :00and f ineiroined fraction of coarse-gromed // ! 1 I l I I I — soils. M 50- I I ( a Equation of.A'-line ..{�I oto I r zo c Horizontal at PI-4 to LL-25.5. \�E z I i ! I I I I l l I = w then PI-0.73(LL-20) '^s/ 11S<\ •,\' a 4o- `r' lo.-isi.. l I I I t z Equation of.U'-line ,/ pP I i ac I , I1 I I .o W Vertical at LL=16 to PI=7 / I� r I I I ! x } then PI=0.9(LL-8) / G ~ �0 I I I I I I j 6O .- ~ 30- /1 = .. U I i I : I �a,.-2.5em , I U f- - // Lt . I l I CC In i t I I I "r < zo- / Q i 20 , ; l I l , Ie�."a.075 � /,/�G�ad' I MH °i OH I l• , l i l too i � l0- 1 v so .0 s ;.o 3.5 0.i0 7---/27;C1:: 04%// ML OR OL PARTICLE SIZE IN MILLIMETERS 4 I f I c i•. .a.ms-too 4.(0(.24- I z.f l' .S.6 00 10 16 20 30 40 50 60 70 a0 90 100 110 . aZ0�i 1T LIQUID LIMIT ILL)