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r <br /> i <br /> CLASSIFICATION CHART <br /> MAJOR DIVISIONS iSY99OLSI <br /> TYPICAL NAMES FILL <br /> P�rr>=RH <br /> GW 0 Well graded gravels or gravel-sand mixtures, little or no fines <br /> r2RAVEl <br /> 0 N � GR 0 Poorly graded gravels or 26 <br /> gravel-sand mixtures, little or no fines <br /> S m MORE THAN 1/2 OF 25 <br /> ' 0 W COARSE FRACTION> GM Silty gravels, gravel-sand mixtures <br /> a _W NO 4 SIEVE SIZE 26=11 <br /> Lin Clayey gravels, gravel-sand-clay mixtures <br /> Z GC <br /> cc 26=14 <br /> N <br /> z SW well graded sands or gravelly sands, little or no fines <br /> w k SANQ!; 6 <br /> SP Poorly graded sands or gravelly sands, little or no fines <br /> k a ,Uj MORE THAN 1/2 OF 6 <br /> 4 Q ;:1 COARSE FRACTION< Silty sands, sand-slit mixtures <br /> O NO 4 SIEVE SIZE SM 9 <br /> SC Clayey sands, sand-clay mixtures <br /> 10 <br /> LU N � ML Inorganic silty$ and very fine sands rock flour, silty or clayey <br /> � fine sands or clayey silts with slight plasticity 11 <br /> O W Inorganic clays of low to medium plasticity, gravelly clays, <br /> U) w <br /> C> LL<5n GL sandy clays, silty clays, lean clays 14 <br /> I l Organic silts andorganic silty clays of low plasticity <br /> OL i r 1 <br /> N 8 <br /> (D a o Inorganic silts, micaceous or diatomaceous fine sandy or silty <br /> M!1 soils, elastic silts <br /> Iv, SI�_TS L t`Itil AY 12 <br /> Z Ln C1� Inorganic clays of high plasticity, fat clays <br /> � w LL-La 15 <br /> o OH // Organic clays of medium to high plasticity, organic silty clays <br /> organic silts 35 <br /> HIGHLY ORGANIC SOILS Pt Peat and other hightly organic soils <br /> 20 <br /> GRAIN SIZE CHART WELL CONSTRUCTION MATERIALS <br /> CLASSIFICATION RANGE OF GRAIN SIZES Asphalt (68) SCREENS <br /> U S Standard Grain Size n Concrete (55) <br /> Steve Size in Millimeters v 0 Solid (is) <br /> ' BOULDERS Above 12' Above 305 ;, Neat Cement (54) <br /> COBBLES 12' to 3' 305 to 76 2Base Course (30} Slotted PVC (3w) <br />' GRAVEL 3' to No 4 76 2 to 4 75 <br /> COARSE 3' to 3/4' 762 to 191 ® Sluff (64) Slot PVC High Flow (8w) <br /> FINE 3/4' to No 4 10 1 to 475 <br /> SAND No 4 to No 200 4 75 to 0 074 Bentonite (21) ® litre Wound PVC (1sw) <br /> COARSE No 4 to No 10 4 76 to 200 <br /> MEDIUM No 10 to No 40 2 00 to 0 420 Filter Pack (7) <br /> FINE No 40 to No 200 0 420 to 0 074 ® Wire Wound Steel (15w) <br /> SILT 6 CLAY Pea Gravel (2) <br /> Belo►r No 200 below No O 074 <br /> Liner (33) Saw Cut {12w) <br /> ® <br /> nGeocloth (36) <br /> SAMPLE TYRES SYMBOLS <br /> SS - Split Spoon <br /> CC - Continuous Core Initial Water Level <br /> CG - Cuttings Grab StatlC Water Level <br /> D4/[3/1892 keyprint—Ian <br /> �GROUNDWATER <br /> TECHNOLOGY <br />