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EXHIBIT C General Granular materials Sill -clay materials classification (35 percent or less of total sample passing No. 200) (More than 35 percent of total sample passing No. 200) Group A-1 A-3 A-2 A-4 A-5 A-6 A-7 classification A-7-5' A -1-a A -1-b A-2-4 A-2-5 A-2-6 A>2-7 A-7-6 Sieve analysis percent passing No. 10 50 max No. 40 30 max 50 max 51 min No. 200 15 max 25 max 10 max 35 max 35 max 35 max 35 max 36 min 36 min 36 min 36 min Characteristics of fraction passing No. 40 Liquid limit, iv, 40 max 41 min 40 max 41 min 40 max 41 min 40 max 41 min Plastic Index, 1,. 6 max NP 10 max 10 max 11 min 11 min 10 max 10 max 11 min 11 min Significant constiluent gravel and fine silty and clayey silly soils clayey soils materials sand sand gravel and sand °See Fig. 8-1L (a) AASHTO Soil Classification System soil groups. A-8 (not shown) is peat or muck classified visually. a IV Note: A-2 soils contain less than 35% finer than No. 200 sieve. 60 z z 50 ,50 i 40 A-7-6 ♦Q4 30 A-6 and A-2-6 20 A-7-5 and A 2-7 10 F LW A-4 and A-2-4 A-5 and A-2.5 0 0 10 20 30 40 50 60 70 80 90 100 Liquid limit wL (6) Liquid -limit and plasticity index ranges for group classification of silt --clay materials. (Standard Specifications for ftm- portation Materials and Methods oJ-Sampling and Rsting, 15th ed., Washington, DC., American Association of State Highway and '11-anspo Cation Officials, Copyright 1990. Used by permission.) Figure 8-1 Charts for use in AASHTO Soil Classification System. 80 8; Classification of Soils