I am working on a concrete cap design for a landfill that has crushed tile and a slurry mixture of mostly small pebbles and some small amounts of clay in it. The landfill is about 5 acres in surface area and roughly 20 feet deep. The landfill will be partially closed until the open area (which is filled with water) is filled with the tile and then the slab will be connected to another slab. We did the geotech investigation yesterday and the SPTs were 40-50 in the first 18 inches, water was encountered (roughly level with water in the open space), then the SPTs were 4-6 until 9 feet (when borehole collapsed). I told the client that we need to dewater the open area and after that we should use a compactor before placing the slab as there will be several inches of settlement. He does not see the slab as having any problems with water in it. Is my recommendation reasonable? I will wait on the geotech report but this seems prudent or am I off? Client is hot to trot to lay the slab as they need the room for storage and 18-wheelers will be driving on it.
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