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1 <br /> KEY TO BORING LOG SYMBOLS <br />' UNIFIED SOIL CLASSIFICATION SYSTEM - ASTM D2488 <br /> MAJOR DIVISIONS SYMBOU DESCRIPTIONS <br /> ' GRAPHIC <br /> GRAVELS <br /> Clean gravels GW Well Graded Gravels, Gravel-Sand Mixtures <br /> with little or no Poorly Graded Gravels, Gravels- Sand <br /> o (More than 50% fines GP :; Mixtures <br /> 0 of coarse fraction • Silty Gravels, Poorly Graded Grave!-Sand- <br /> is larger than the GM <br /> g Gravets with Silt Mixtures <br /> o t #4 sieve size) over 12%fines <br /> Lu .. Clayey Gravels, Poorly Graded Gravel- <br /> rr <br /> rn GC Sand- Clay Mixtures <br />' co <br /> C7 - Clean sands SW <br /> U) Well Graded Sands, Gravelly Sands <br /> Cc 0 SANDS with little or no <br /> 3 fines SP Poorly Graded Sands, Gravelly Sands <br />' O (More than 50% <br /> of coarse fraction Silty Sands, Poorly Graded Sand-Silt <br /> is smaller than SM Mixtures <br /> " #4 sieve size) OVer 12%t fines <br /> SC Clayey Sands, Poorly Graded Sand- <br />' Clay Mixtures <br /> Inorganic Silts and Very Fine Sands, Silty <br /> ML or Clayey Fine Sands <br /> —.1 <br /> N SILTS AND CLAYS CL Inorganic Clays of Low to Medium Plasticity, <br /> O o Gravelly, Sandy or Silty Clays, Lean Clays <br /> (liquid limit less than 50) <br /> o OL Organic Clays and Organic Silty Clays of <br /> �'�'�'� <br />' w ro ,', Low Plasticity <br /> z � <br /> Inorganic Silts, Micaceous or Diatomaceous <br /> C7 ro MH Fine Sandy or Silty Soils, Elastic Silts <br /> Lu E SILTS AND CLAYS <br /> o CH Inorganic Clays of High Plasticity, Fat Clays <br /> LL <br /> (liquid limit greater than 50) <br /> Organic Clays of Medium to High Plasticity, <br /> OH r , Organic Silts <br /> HIGHLY ORGANIC SOILS Pt Peat and other Highly Organic Soils <br />' Stabilized water level (date) <br /> Asphaltic Concrete <br />' Water level encountered during drillingb e <br /> b d Portland Cement Concrete <br /> ��a <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 PID Photo-ionization detector readings (ppmv) <br /> FID Flame-ionization detector readings (ppmv) <br /> • <br /> Monitoring well <br />' <br /> Soil boring EXP Gastech explosimeter readings (ppmv) <br /> i9 <br />' Geraghty & Miller, Inc. Key to Boring Log <br />