Landfill Expansion Requiring Siting Restriction Studies, Hydrogeologic Investigation, and Landfill Design

Wetland Delineation, Cultural Investigation, Wildlife Evaluation, and Hydrogeologic Investigation

Client: City of Columbia | Location: Missouri 

Weaver Consultants Group (WCG), in coordination with the U.S. Army Corps Engineers (USACE), completed a wetland delineation for a client that was planning a landfill expansion. Two final cut lakes in the center of the expansion area present design challenges to the proposed expansion. WCG completed a historical survey and obtained approval from the State Historic Preservation Officers (SHPO). WCG then conducted a geologic and hydrogeologic investigation that required 75 borings, of which half were advanced into the deeper bedrock water-bearing unit. Communication with the client during changes to the exploration and testing program was key after additional borings and deeper borings were required for the hydrogeologic investigation. A Packer Test was performed on the borings to identify a geologic buffer layer. The shallow and deep piezometers were slug-tested for aquifer characterization. 

WCG developed a field method that would be sensitive enough to calculate the low permeability required for a geologic buffer after the industry standard flow meters were determined to not be sensitive enough for the project criteria.