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KEY TO BORING LOG SYMBOLS <br /> UNIFIED SOIL CLASSIFICATION SYSTEM - ASTM D2488 <br /> MAJOR DIVISIONS SYMBOL/ DESCRIPTIONS <br /> GRAPHIC <br /> GRAVELS <br /> Clean gravels JGP <br /> Well Graded Gravels, Gravel-Sand Mixtures <br /> with little or no <br /> Poorly Graded Gravels, Gravels-Sand <br /> a� <br /> N (More than 50% fines Mixtures <br /> o of coarse traction <br /> O Vw is larger than the GM Silty Gravels, Poorly Graded Gravel -Sand- <br /> cn #4 sieve size) Gravels with Silt Mixtures <br /> ca over 12%fines Clayey Gravels, Poorly Graded Gravel- <br /> rn GCNO <br /> Sand-Clay Mixtures <br /> (D Clean sands SW Well Graded Sands, Gravelly Sands <br /> U SANDS with little or no <br /> m <br /> 3 fines SP Poorly Graded Sands, Gravelly Sands <br /> 0 >, (More than 50% <br /> of coarse fraction Silty Sands, Poorly Graded Sand-Silt <br /> o SM <br /> is smaller than <br /> LO #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 /> SILTS AND CLAYS <br /> rn 9n Inorganic Clays of Low to Medium Plasticity, <br /> -j a CL Gravelly, Sandy or Silty Clays, Lean Clays <br /> Cn N (liquid limit less than 50) <br /> o �OL , Organic Clays and Organic Silty Clays of <br /> w Low Plasticity <br /> zy <br /> Inorganic Silts, Micaceous or Diatomaceous <br /> MH <br /> @ Fine Sandy or Silty Sods, Elastic Silts <br /> w E SILTS AND CLAYS <br /> o CH Inorganic Clays of High Plasticity, Fat Clays <br /> (liquid limit greater than 50) <br /> OH f Organic Clays of Medium to High Plasticity, <br /> . f Organic Silts <br /> HIGHLY ORGANIC SOILS Pt Peat and other Highly Organic Soils <br /> Stabilized water level (date) Asphaltic Concrete <br /> Q Water level encountered during drilling a <br /> abs <br /> Portland Cement Concrete <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 />