Two meters below the ground surface, a 2x2 m square footing is constructed on NC clayey sand. The layer is subjected to a CPT test, with the results revealing an average cone resistance of 20 Mpa. A layer of hard rock is laid 20 meters below the surface. The service load of 25 ton.f is acting on the footing column. Find the elastic settlement using the generalized elastic method. The water level is at the surface and you can use Yw = 10 KN/m3. (footing weight is negligible) TABLE 4.8 ESTIMATING EQUIVALENT SOIL MODULUS, ES, VALUES FROM CPT RESULTS [Adapted from Schmertmann et al. (1978), Robertson and Campanella (1989), and other sources.] USCS Group Symbol Soil Type Eslac Young, normally consolidated clean silica sands (age < 100 years) SW or SP 2.5-3.5 Aged, normally consolidated clean silica sands (age > 3,000 years) SW or SP 3.5-6.0 Overconsolidated clean silica sands SW or SP 6.0-10.0 Normally consolidated silty or clayey sands SM or SC 1.5 Overconsolidated silty or clayey sands SM or SC 3