Comparative Study of Soil Index Properties of Gudu Sokoto State and Oworoshoki Area Lagos State, Nigeria

The comparative study of the soils sample collected from Gudu and Oworoshoki area, Sokoto state and Lagos State
was carried out to compare the index properties of soil at shallow soil deposit. The Global Positioning System (GPS) was used to
locate the coordinates of the site. Shallow soil samples (disturbed and undisturbed) at different depths (1m, 2m and 3m) were
collected from both study areas (Gudu and Oworoshoki). The disturbed samples were collected using hand trowel, digger, hoe
and polythene bags while the undisturbed samples were collected using short pipes (samplers) by stroking each pipe into the
ground completely with a hammer at each depth. Disturbed and undisturbed soils collected at different shallow depths (1m, 2m
and 3m) were taken to the laboratory for natural moisture content, specific gravity, sieve analysis, Atterberg limits and unit weight
test. Empirical equations were used for analyzing the soil samples and AASTHO System of classification was used for classifying
the soil samples. The results of the test on Gudu soil samples has shown that the soil sample collected at depth 1.0m and 2.0m
are nonplastic materials and were classified according to AASHTO standard as A-3 and sample at depth 3.0m as A-4 which is silty
soil while Oworoshoki soil samples has shown that Soils from depth 1.0m, 2.0m and 3.0m are nonplastic (NP) because the Plastic
Index (PI = 0) is zero and the soil samples are classified as A – 3 according to AASHTO standard.