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UNIFIED SOIL CLASSIFICATION SYSTEM -VISUAL CLASSIFICATION OF SOILS (ASTM D-2488) • MAJOR GROUPSIONS SYMBOL GROUP NAME DESCRIPTION DIVISIONS aaaG 6o0a a a a a a Well graded gravel 0000 G W Well graded gravel with sand Well-graded gra%els or gravel sand O Q 9 mixtures little or no fines :0 GRAVEL 0r4.4 4� Poorly-graded gravel .4.4.4.4. G P Poorly graded gravel with sand Poorly graded gravels or gravel AND .4.0.4.4. sand mixture little or no fines 68 GRAVELLY '0'0'4'4' Silty gravel 14`41414. 'GM Silty gravel with sand Silty gravels gravel sand-silt SOILS '4'4'4`4' mixtures Clayey gravel COARSE G C Clayey gravel with sand Clayey mixtures gravel sand clay GRAINED SOILS SW Well graded sand Well graded sands or gravelly Well graded sand with grave] sands little or no fines SAND S P Poorly graded sand Poorly graded sands or gravelly AND Poorly graded sand with gravel sands little or no fines SANDY \1\\11\\\\ SM Silty sand \ \ \ 1 SOILS Silty sand with gravel Salty sands sand silt mixtures I � SC Clayey sand Clayey sand with gravel Clayey sands sand clay mixtures \\\\441\\\ 4411\\\111 Silt Silt with sand Silt with gravel Inorganic silts and very fine \\\\\\1114 SILTS \\\\14441\ Sandy silt Sandy silt with gravel sands rock flour silty or 1111\\\\•1 Gravel! silt Graven silt with sand clayey fine sands or clayey \\\1\11111 Y Y Y Y AND siIt5 with sh ht lasncit I CLAYS Lean clay Lean clay with sand Lean clay with gravel Inorganic clays of low to medium FINEC L Sandy lean clay Sandy lean clay with gravel plasticity gravelly clays sandy GRAINED Gravelly lean clay Gravelly lean clay with sand clays silty clays lean clays tti�►t;tit ELASTIC titti�titwti� Elastic silt Elastic silt with sand Elastic silt with rave SOILS ttt�ttiart g Inorganic silts micaceous or �tit�ytititi MH Sandy elastic silt Sandy elastic silt with gravel diatamaceous fine sandy or silty SILTS Gravelly elastic silt Gravelly elastic silt with sand soils elastic silts AND Fat clay Fat clay with sand Fat clay with gravel CH Sandy fat clay Sandy fat clay with gravel Inorganic clays of tugh plasticity CLAYSIVA Gravelly fat clay Gravelly fat clay with sand fat clays fi Organic soil Organic soil with sand Organic soil with gravel Organic silts and organic silt O L�G H Sandy organic soil Sandy organic soil with gravel clays Of law plasticity HIGHLY Gravelly organic soil Gravelly organic sod with sand Organic clays of medium to high plasticity t ORGANIC SOILS Pt Peat Peat and other highly organic soils WELL CONSTRUCTION EXPLANTION SOIL BORING NOTES SANDS &GRAVELS BLOWS/FT SILTS & CLAYS BLOWS/FT Blank well casing Blow count represents the number of blows of a Neat cement or 140]b hammer failing 30 inches per blow required VERY LOOSE 0 - 5 SOFT 0 5 sand slurry seal to drive a sampler through the last 12 inches of an LOOSE 5 12 FIRM 18 inch penetration 5 10 Bentonite seat No warranty is provided as to the continuity MED DENSE 12 37 STIFF 10 20 Of soil strata between borings Logs represent DENSE 37 - 62 VERY STIFF 20 40 — the soil section observed at the baring location VERY DENSE OVER 62 HARD OVER 40 Well sandpack on the date of dolling only 5=Sampler sank into medium under the weight of Approximate stabilized NOTE all percentages of lithoiogical the hammer(no blow count)Wel]screen P=Sampler was pushed water level composition presented on the soil boring into medium by drilling ng logs are approximate They represent the (no blow count} 4 Approximate first encountered best estimates of a CGI geologist based on NR = No Recovery = water level visual inspection in the field C IL IE A R WAt�_E SOIL BORING LOG AND Group, Inc. WELL CONSTRUCTION DIAGRAM LEGEND