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EXHIBIT C <br />General Granular materials ~ Silt-clay materials <br />classification (35 percent or less of total sample passing No <br />200) (More than 35 percent of total <br /> . sample passing No. 200) <br />Group A-1 A-3 A-2 A-4 A-5 A-6 A-7 <br />classification <br />A-1-a A-1-b <br />A-2-4 <br />A-2-5 <br />A-2-6 <br />A-2-7 A-7-5" <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, 1,. 6 max NP 10 max 10 max 11 min 11 min 10 max 10 max 11 min 11 min <br />Significant constituent gravel and fine silty and clayey silty soils clayey soils <br />materials sand sand gravel and sand <br />"See Fig. 8-tb <br />(a) AASHTO Soil Classification System soil groups. A-8 (not shown) is peat or muck ciassified visually. <br />a <br />x <br />v <br />c <br />w <br />~o <br />a <br />,., 1 1-__ <br />Note: A-2 soils contain less than <br />35% finer than No. 200 si <br /> <br />eve. <br />60 <br /> <br />50 <br /> <br /> <br />40 , <br />~ 50 <br /> A-7 -6 ' <br />~Q ~ <br />30 <br /> <br /> <br />20 A-6 and A -2-6 <br /> A- 7-5 an d A-2 -7 <br />10 - <br /> A-4 a nd A- 2-4 A-5 and A -2-5 <br /> <br />0 <br />0 10 20 30 .40 50 60 70 80 90 100 <br />Liquid limit wy <br />(b) Liquid-limit and plasticity index ranges for group classification of silt-clay materials. (Standard SpecifuationS for Trans- <br />portation Materials a~td Methods of Sampling and Tlsting, 15th ed., Washington,. DC., .American Association of State <br />Highway and 1Yansportation Officials, Copyright 1990. Used by permission.) <br />Figure 8-1 <br />Charts for'use in AASHTO Soil Classification System. <br />80 8: Gasification of Soils <br />