We are building a new house. Our property is in a valley lower than the surrounding area with a gradual slope. Our builder leveled our site for a post-tension slab. When we started digging for the footers at 2 feet the bottom was pretty soft so he dug another foot or so and hit water (lots of water with sand as the soil). So about 4 foot down is the water table. We had a geo-tech come out and take a look. His advice was to build a pad 30" above grade and compact very good and then lay the footings and slab. We have had a very rainy season (Oklahoma) so the water table is higher than the norm. Anyone out there have similar experiences or have advice I would greatly appreiciate it.
Since your are prestressing the slab anyway you can drill piers through the perimeter of the foundation to bedrock or a depth determined by the geotech which would support the house. The distance between the piers could be determined by the structural/civil engineer who designed the slab. The would involve having a driller drill the piles then place rebar cages up and into the slab. This might be more or less expensive than regrading. It would depend how deep you have to go and access to the property how many piles you would need. Depending on the size of the house you have 1 day to drill and then 1 day to place the cages and 1 day to place concrete which can be done with the slab work.
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