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r <br /> EXHIBIT C <br /> 'I <br /> I~ <br /> General Granular materials Sitt-clay materials <br /> I (More Than 35 percent of total <br /> ~ classification (35 percent or less of total sample passing No. 200) sample passing No. 200) <br /> I <br /> f ' Group A-1 A-3 A-2 A-4 A-5 A-6 A-7 <br /> classification A-7-5" <br /> - A-1-a A-1-b A-2-4 A-2-5 A-2-6 A-2-7 <br /> A-7-6 <br /> Sieve analysis <br /> percent passing <br /> No. 10 50 max <br /> No. 40 30 max 50 max 51 min <br /> ~ No. 200 15 max 25 max 10 max 35 max 35 max 35 max 35 max 36 min 36 min 36 min 36 min <br /> Characteristics of <br /> fraction passing <br /> No. 40 <br /> Liquid limit. ~c,, 40 max 41 min 40 max 41 min 40 max 41 min 40 max 41 min <br /> Plastic Index, 6 max NP 10 max 10 max 11 min 11 min 10 max 10 max 11 min 11 min <br /> SigniticaM constituent gravel and fine silty and clayey <br /> materials sand sand gravel and sand silty soils clayey soils <br /> "See Fig. 8-tb <br /> (a) AASHTO Soil Classification System soil groups. A,8 (not shown) is peat or muck classified visually. <br /> 70 <br /> Note: A-2 soils contain less than <br /> 3596 finer than No. 200 sieve. <br /> I <br /> I <br /> 60 <br /> ' 50 <br /> ,50 <br /> i <br /> 40 <br /> ~ A-7-6 ` <br /> ~ > <br /> ~U <br /> 30 <br /> ~ a <br /> A-6 and A-2-6 <br /> A-7-5 and A-2-7 <br /> 10 <br /> A-4 and A-2-4 A-5 and A-2-5 <br /> 0 <br /> 0 10 20 30 40 50 60 70 80 90 100 <br /> Liquid limit w~ <br /> (b) Liquid-limit and plasticity index ranges for group classification of silt~lay materiats. (Standa>•+d Specifications jor 7iuns- <br /> F portation Materials axd Methods of Sampling and 12:ating, 15th ed., Washington, DC., American AssoaatSon of State <br /> Highway and 1Yansportatron Officials, Copyright 1990. Used by permission.) <br /> <br /> - Figure &1 <br /> Charts for use in AASHTO Soil Classification System. <br /> 80 8: gasification of Soils <br /> <br />