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KEY TO EXPLORATORY BORING LOGS <br /> EXCEL.TECH <br /> . Soil Sample Location <br />' Q First Encountered Ground Water Level <br /> Plezometric Ground Water Level <br /> Disturbed or Bag Soil Sample <br />' 2.5YR 612 Soil Color according to Munsell Soil <br /> Color Charts. (1875 Edition) <br /> Penetration Sample drive hammer weight-140 pounds <br />' failing 30 Inches. Blows required to drive <br /> sampler 1 foot are Indicated on the logs. <br /> Unified Soil Classification System <br /> Compfled by B W Plpkln,University of Southern Cal(lomia — <br /> MAJOR DmsQNs GAOUP <br /> SYMBOLS TypK,AL NAMES <br /> GW WO&Qradad gravoic grevtl-asnd matures <br />' A ally or no fin.a <br /> p a }I b y <br /> op pull'graded p pra.ataend mix <br /> z tS 33 tarp N One Imor no pries <br /> IS V a GM Silty gravels prevet-aand-4dt mixtures <br /> y 9 L GC Clayey grewls gravat•aatdc4y mlYtures <br /> W t2 WdH roiled sands,gravefly sands sate or <br /> r w SW no Rnea <br /> R �i= Sp Poorly graded sanQa pravaliy vends Mth <br /> tf or no fktaa <br /> 3 � SM SAry sands sand-uR mixtures <br /> SC clay"sande aardday mature <br /> Inorganbc cuts and very tone cards rock <br /> rel Romer olry a clayey Rrra sands or clayey <br /> Wh <br /> rn F a with s1,gM plaallchy <br /> +g CL Inorganic clays of low 10 medw n pLaaha <br /> ,€ N gravelly clays Bandy days adty clays <br /> 1 <br /> clays <br /> a <br /> _�,a e � � gNc aWee and aegank:airy days of low <br /> e g F plast" <br /> d MH Inprgantc slits micscaous of d,atomt- <br /> h Ceoua Rhe sandy or Why sous erashc sate <br /> CH inorganic trays of high pi—crly fat days <br /> ON OrgaWIC hays of thedlurn to high plaslk:. <br /> ry organ4c sighs <br /> Highly orga i c 30+42 P1 Peat and ather highgy orgon,c arks <br /> NOTES <br /> 1 Boundary Classitcailon Sats poseessing chwacteryhcs of two groups are des,gnated by Com <br /> b,n4940112 0 group symbols For example GW-GC wellyraded gtovd-sand mixture with Cray ovrdar <br /> 2 All 21ave 8442 an this Chart are U S Standard <br /> The terms V010 and"Clay-are used respectively to dlshngursn materugs•.hibltrng 50wer plasticity <br /> horn Lhasa with hrgherpiasW" The minus no 200 slave malenal Is silt d the lrgw0 linin and plasl,Crry <br /> rie:pbelow the A Mne On try 04aWCftY chart(next page) and re clay It INAd lrquUrns and plasucay <br /> Id1W nde+pool above the-A pry on the chart <br />' • <br /> For a compyle descophon or the Undyedb <br /> Sod Ctawficaln Systam see-Tschmndm <br /> nlcal Meorau <br /> No }357'prepared to Ort,ce Chlet of Engrneers by Walerways Equrpmenl Stag-On Vwxsburg M,s <br /> uaa,pp, March 1953 (Sea also O-le Shat 17 1 <br /> • <br /> 1 <br />