The property owner has accepted a contractor’s bid to perform work before the contractor has seen the site. After signing the contract, the contractor goes to see the site. The soil is not as explained by the owner. The location is not as represented by the owner. How is this addressed in regard to the contract?

The property owner has accepted a contractor’s bid to perform work before the contractor has seen the site. After signing the contract, the contractor goes to see the site. The soil is not as explained by the owner. The location is not as represented by the owner. How is this addressed in regard to the contract?