Explain Dry soil mixing method.

The phrase "Unified Soil Classification System" (USCS) refers to a classification system for soil.

You are planning to build a three story above ground building with a basement parking garage below ground. The bottom of your slab/foundation will be 17 ft below existing grade. You plan to keep the ground water level in the excavation 3.0 ft below the bottom of the foundation for approximately 3 months. The water table is 11 ft below existing grade. The soil is uniform medium sand down to a depth of approximately 50 ft. The soil below 50 ft is an impervious clay. Your excavation will be 320 ft x 150 ft. You have determined that a 4 ft wide x 3 ft deep sump around the perimeter of your excavation will provide adequate dewatering capacity. Based on test wells on site, you determined that the medium sand has a k value of .058 ft/min and that the D factor is 50 ft. a. Label D, H, and ht on the given diagramb. Calculate the flow rate, q c. Calculate the total volume of water that will need to be pumped in gallons per minute (GPM)

How the classification of a fine-grained soil as either a silt or a clay is done?