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EXHIBIT C General Granular materials Sill-clay materials c1assification (35 percent or less of total sample passing No. 200) (More than 35 percent of total sample passing No. 200) I Group A-' A-3 A-2 A-4 A-5 A-6 A-7 classification A-7 -5" A-'- a A-'-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 5' 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. IC/. 40 max 41 min 40 max 41 min 40 max 41 min 40 rnax 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 constituent gravel and fine silty and clayey silty soils clayey soils materials sand sand gravel and sand nSee Fig. 8-1b (a) AASHTO Soil Classification System soil groups. A-8 (not shown) is peat or muck classified visually. 70 10 I I I I I I 7 Note: A-2 soils contain I~ss than I---~ 35% finer than No. 200 sieve. V V V V /~y :7 A-7 -6 ~ \1 V / A-6 and A-2-6 7 7 A-7.5 and A-2-7 / A-4 and A-2-4 A-51 and '"}-2-5 I I 60 50 -"- x 40 Q) "0 c: ~ 'u ~= 30 (1) a:: 20 o o 10 20 30 40 50 Liquid limit W L 60 70 80 90 100 (b) Liquid-limit and plasticity index ranges for group classification of silt-clay materials. (Standard SpecificatiO'Tl.$ for 7rans- portation Mat.e'lials and Methods of Sampling and 'Iesting, 15th ed., Washington, DC., American Association of State Highway and 'Ihnsportation Officials, Copyright 1990. Us~ by permission.) Figure 8-1 Charts for use in AASHTO Soil Classification System. 80 8: Classification of Soils