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A residential building is proposed to be constructed at a site. The foundation level is1.8mbelow the ground surface. The soil profile shows that the soil at the site is composed of a layer of buried trash of thickness of2.5mfrom the ground surface. This trash is weak and compressible, and thus would not provide adequate support for the proposed construction. The trash is followed by a deep layer of dense sand. The ground water table is at a depth of20m. Recommend a method of solving this problem and explain the reason of your choice to the method. Q 2: Open Pumping is one of the common methods in dewatering. Using neat sketches for a plan view and a cross section, explain this method. Discuss any limitations. Q 3: Using neat sketches, explain the differences between well points and deep wells in construction dewatering.

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