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A soil deposit has a unit weight of 120 pcf above the groundwater and 128pcf below...

A soil deposit has a unit weight of 120 pcf above the groundwater and 128pcf below the groundwater. It has an undrained shear strength (Su) of 500psf, effective cohession (c') of 200psf, and effective friction angle (φ') of 31 degrees and extends to a great depth. the groundwater table is at 15 ft below ground surface

A) What is the short term (undrained) shear strength of the soil at a depth of 30ft below ground surface?

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