Use the Burland-Burbridge method to estimate the expected settlement for a square footing, 8 ft. by 8 ft in plan, that is at the interior of a building. Footing thickness is to be assumed to be 2 ft. and bottom of the footing is to be set 4 ft. below ground surface. This footing will have a design contact pressure of 2.5 tsf. It will bear on the natural sand soil represented by test boring B- 704 (copy of log attached). You must use your assessment of soil conditions to determine the appropriate unit weight to use. Sand has an average N-value (made with the donut hammer) of 21 blows per foot through the depth of concern for settlement. You will need to determine the N60 values. Groundwater is at depth indicated on the boring log. Use the time factor for 50 years. 1.B. How much settlement would be estimated using the same approach if the contact pressure were reduced to 1.75 tsf? 1.C. How much settlement would be estimated to occur if the footing were a continuous wall footing, with width of 3.0 ft and contact pressure of 2.0 tsf