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UNIFIED SOIL CLASSIFICATION SYSTEM MAJOR GROUP DESCRIPTION MAJOR GROUP DESCRIPTION DIVISION SYMBOL DIVISION SYMBOL GM Hell-graded gravels or gravel sand ML Inorganic silts and very tine GRAVEL mixtures little or no fines SILTS sands rock flour silty or clayey fine sands or clayey silts AND GP Poorly-graded gravels or gravel AND with alight plasticity sand mixtures little or no tines GRAVELLY CLAYS CL Inorganic clays of low to mediun GM Silty gravels gravel-sand-silt plasticity gravelly clays sandy SOILS mixtures LLi50 clays silty clays lean clays COARSE GC Clayey gravels gravel-sand-clay PSN£ OL Organic silts and organic silt- mixtures Clays of low plasticity GRAINED GRAINED SY Well-graded sands or gravelly MH Inorganic silts micaceous or SOILS SAND sands little or no fines SOILS SILTS diatomaceous tine sandy or silty ' soils elastic slits AND SP Poorly-graded sands or gravelly AND sand little or no tines CH Inorganic clays of high plasticity SANDY CLAYS tat clays ' SOILS SM Silty sands sand-silt mixtures 1,050 OR Organic clays of medium to high plasticity organic silts SC Clayey sands sand-clay mixtures RICHLY Pt Peat and other highly organic ORGANIC SOILS soils ' STANDARD PENETRATION SPLIT SPOON SAMPLE mSHELBY TUBE SAMPLE ® MODIFIED PORTER SAMPLE (2 5-in I D ) MODIFIED CALIFORNIA SAMPLE (2 0-in I D 1 SZ HATER LEVEL OBSERVED IN BORING N R NO RECOVERY ' N F W E NO FREE HATER ENCOUNTERED PP POCKET PENETROMETER (field) ' NOTE THE LINES SEPARATING STRATA ON THE LOGS REPRESENT APPROXIMATE BOUNDARIES ONLY THE ACTUAL TRANSITION MY BE GRADUAL NO WARRANTY IS PROVIDED AS TO THE CONTINUITY OF SOIL STRATA BETWEEN BORINGS LOGS REPRESENT THE SOIL SECTION OBSERVED AT THE BORING LOCATION ON THE DATE OF DRILLING ONLY ROEK BROTHERS PROPERTY, STOC7,TOA BALBI & CHANG ASSOCIATES PROJECT t%O 1705-1 DATE 4/25/88 Gootechnical Consultants / MatorialG Testing PREPARED BY BX PLATE A-1