A contractor brought 10,000 cubic yard of soil to site to create a ramp. The water content of the soil is 30%. According to the engineer, the soil is too wet, and should be dried to 20% water content before it can be placed and compacted. The contractor will have to leave the pile of soil at the site to get dried. If 60,000 lbs of water evaporates from the pile each day, how long the contractor will have to wait before he can place the soil?
Specific gravity of soil is 2.6, and the degree of saturation is 90%. Assume that the overall volume does not change due to drying.