Calculate the following using Figure 2 and Table 1: H H H A B C Dry sand 1|4 Sand Clay Figure 2 Rock Layer 1 Groundwater table Layer 2 Layer 3 Layer No. 1 2 3 Table 1. Summary of Data Thickness (ft) 7 12 6 Unit Weight (lb/ft) 110 121 118 Lateral Earth Coefficient, K 0.8 0.8 0.8 (10pts) What is the change in effective vertical stress at point D if the water table is increased by 1 feet? (assume Ysat for the first layer is 115 lb/ft3) lb/ft2