Laserfiche WebLink
Unified Soil Classification System <br /> Major Divisions Symbols Typical Names <br /> GW Well graded gravels or gravel sand mixtures, <br /> little or no fines <br /> Gravels Poorly graded gravels or gravel-sand mixtures, <br /> (More than half of GP little or no fines <br /> ' to coarse fraction a <br /> `p o no.4 sieve size) GM Sandy gravels, gravel-sand-silt mixtures <br /> ami a GC Clayey gravels,gravel-sand-clay mixtures <br /> A <br /> C7 SW Well graded sands or gravelly sands, little or no tines <br /> M Sands <br /> USP Poorly graded sands or gravelly sands, little or no fines <br /> m <br /> (More than halt of <br /> ' o coarse fraction c :-; <br /> � no.4 sieve size) SM Silty sands, sand-silt mixtures <br /> SC Inorganic silts and very fine sands, rock flour silty <br /> or clayey fine sands or clayey silts with slight plasticity <br /> ML Inorganic silts and very fine sands, rock flour, silty <br /> fine sands or clayey silts with slight plasticity <br /> w ° Silts and Clays CL Inorganic clays of low to medium plasticity, gravelly <br /> ' N C> LL= <50 clays, sandy clays, lean clays <br /> i' OL Organic silts and organic silty clays of low plasticity <br /> V <br /> i Inorganic silts, micaceous or diatomaceous fine sandy <br /> � o MH <br /> or silty sails, elastic silts <br /> Q <br /> t <br /> ii Silts and Clays CH Inorganic clays of high plasticity,fat clays <br /> LL= > 50 <br /> o `,`,•, Organic clays of high plasticity, organic silty clays, <br /> E 44,4, OH organic silts <br /> ' Highly Organic Soils Pt Peat and other highly organic soils <br /> ' Grain Size Chart Sample Designation <br /> Range of Grain Sizes <br /> ' Classification U.S.Standard Grain Size Sample Interval <br /> Sieve Size in Millimeters <br /> Boulders Above 12" Above 305 <br /> ' Cobbles 12"to 3" 305 to 76.2 No Sample Recovery <br /> Gravel 3"to No. 4 76.2 to 7.76 <br /> coarse 3"to 3/4" 7.62 to 4;76 Sample Interval Retained for <br /> ' fine 3/4"to No.4 19.1 to 4.76 Chemical Analysis <br /> Sand No.4 to No. 200 4.76 to 0.074 <br /> coarse No.4 to No.10 4.76 to 2.00 <br /> medium No.10 to No.402.00[00.420 513;:x:;- ; Soil Sample Selected for <br /> fine No.40 to No.2a0 0.420 to 0.074 Chemical Analysis <br /> Silt and Clay Below No.200 Below 0.074 <br /> �_ Groundwater First Encountered <br /> During Drilling <br /> SEACOR <br />