According to the Burmister classification system, soil is classified based on its grain size distribution for granular soil and plasticity index for cohesive soil. Figure-1 showed the results of the Atterberg limits test from the laboratory. The plasticity index of the soil was calculated using the liquid limit and plastic limit values.
|Boring Location||Elevation||Liquid Limit %||Plastic Limit %||Plasticity Index|
|6′ – 8′||81.7||29.81||52|
Based on the plasticity index from Figure-1, the cohesive soil was classified as Black Silty CLAY and the granular soil was classified as Yellow SAND trace Gravel.