St. Louis Premium Outlets, in the Chesterfield Blue Valley development park is a 100+ outlet store open air shopping mall. Clayton Engineering was selected for initial site Topographic & Machine Control Surveying, Civil Engineering & Design and also the Construction Staking during the development. Clayton Engineering also provided the final MSD As-Builts for the sewers as well as the final Construction As-Builts to the contractor and The City of Chesterfield.