Soil Compaction Handbook
GP Poorly-graded gravels, gravel/sand mixtures, little or no fines GM Silty gravels, poorly-graded gravel/sand/silt mixtures GC Clay-like gravels, poorly graded gravel/sand/clay mixtures SW Well-graded sands, gravelly sands, little or no fines SP Poorly-graded sands, gravelly sands, little or no fines SM Silty sands, poorly-graded sand/