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EXHIBIT C <br /> I . <br /> General Granular materials Sdt-clay materials <br /> dass~cation (35 percent or less of total sample passing No. 200) (More ~ d total <br /> sample Passing No. 200) <br /> Group A-1 A-3 A-2 A-4 A-5 A-& A-7 <br /> classification <br /> <br /> 1 1 A-1-a A-1-b A-2-4 A-2-5 A-2-6 A-2-7 A-7-5 <br /> ' A-7-6 <br /> <br /> i ~ Sieve analysis <br /> I percent passing <br /> No. 10 50 max <br /> No. 40 30 max SU max 51 min <br /> i <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, icy 40 max 41 min 40 max 41 min 40 max 41 min 40 max 41 min <br /> Plastic Index, I, 6 max NP 10 max 10 max 11 min 11 min 10 max 10 max 11 min 11 min <br /> ~ Sigryficanl constituent gravel and fine <br /> ~ materials sand ~ and shy sods clayey soils <br /> gravel and sand <br /> <br /> ~ •See Fig. 8-1L <br /> <br /> I ~ <br /> (a) AASHTO Soil Classification Svstem soil groups.' A,8 (not shown) is peat or muds classified visually. . <br /> 70 <br /> I Note: A-2 soils contain less than <br /> ~ 35% finer than No. 200 sieve. <br /> j ~ . <br /> <br /> 1 <br /> I 50 <br /> ~I <br /> 9~ <br /> x40 <br /> ~ o w <br /> I, c A-7-6 ~ <br /> i .T . <br /> i <br /> v <br /> 30 <br /> ~ o <br /> a <br /> i <br /> A-6 and A-2-6 <br /> ' A•7-5 and A-2-7 <br /> ~ 10 <br /> ~ A-4 and A-2-4 <br /> A-5 and A-2-5 <br /> 'i 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-clay materials. (Standard Specifications jor ?l+ans- . <br /> porlalimi .Materials and Methods of Sampling a~?td Tilting, ISth ed., Washington, DC., American Association of State <br /> i Highway and 'll-ansportation Officials, Copyright 1990. Used by permission.) <br /> ' Figure 8-1 <br /> Charts for use in AASHTO Soil Classification System. <br /> ~ 8: Classification of Soils <br /> <br />