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1 <br /> KEY TO BORING LOG SYMBOLS <br />' UNIFIED SOIL CLASSIFICATION SYSTEM - ASTM D2488 <br /> MAJOR DIVISIONS SYMBOL/ DESCRIPTIONS <br /> GRAPHIC E <br /> GRAVELS Clean gravels GWell Graded Gravels,Gravel-Sand Mixtures <br /> with tittle or noPoorly Graded Gravels, Gravels-Sand <br /> fines G <br /> N (More than 50% Mixtures <br /> o of coarse fraction <br /> N Silty Gravels, Poorly Graded Gravel-Sand- <br /> O is larger than the GM <br /> #4 sieve size) Gravels with Silt Mixtures <br /> ' w t over 12%fines Clayey Gravels, Poorly Graded Gravel- <br /> GC Sand-Clay Mixtures <br /> Cd <br /> OClean sands SW Well Graded Sands, Gravelly Sands <br /> U) m SANDS with little or no <br /> 3 fines SP Poorly Graded Sands, Gravelly Sands <br /> O (More than 50% <br />' o of coarse fraction <br /> o is smaller than <br /> 5M Silty Sands, Poorly Graded Sand-Silt <br /> U) #4 sieve size ) Sands with Mixtures <br /> over 12%fines Clayey Sands, Poorly Graded Sand- <br /> ' Sc Clay Mixtures <br /> Inorganic Silts and Very Fine Sands, Silty <br /> ML or Clayey Fine Sands <br /> aSILTS AND CLAYS Inorganic Clays of Low to Medium Plasticity, <br /> CL Gravelly, Sandy or Silty Clays, Lean Clays <br /> o <br /> a (liquid limit less than 50) <br /> oOrganic Clays and Organic Silty Clays of <br /> UJ CL Low Plasticity <br /> ' zr <br /> 9 <br /> Q <br /> Inor anic Silts, Micaceous or Diatomaceous <br /> 0 MH Fine Sandy or Silty Soils, Elastic Silts <br /> W E SILTS AND CLAYS <br /> ' o CH Inorganic Clays of High Plasticity, Fat Clays <br /> LO a (liquid limit greater than 50) <br /> A OH { Organic Clays of Medium to High Plasticity, <br /> . f f Organic Silts <br /> HIGHLY ORGANIC SOILS Pt Peat and other Highly Organic Sods <br /> ' Stabilized water level (date) Asphaltic Concrete <br /> Q Water level encountered during drilling a a <br /> Portland Cement Concrete <br /> aaa <br /> Shaded interval represents soil sample <br /> Blackened interval indicates portion of Cement Grout <br /> ' sample prepared for laboratory analysis <br /> Indicates no recovery of sample <br /> Monitoring well <br /> Soil boring <br /> Geraghty & Miller, Inc. Key to Boring Log <br /> j <br />