For an inorganic soil, the following grain-size analysis is given.
U.S. Percent
Sieve No. passing
4................................100
10................................90
20................................64
40................................38
80................................18
200..............................13
For this soil, LL = 23 and PL = 19. Classify the soil by using
a. AASHTO soil classification system
b. Unified Soil Classification System
Give group names and group symbols.