Thompson Engineering provided construction engineering and inspection (CEI) and Quality Assurance/Quality Control (QA/QC) for 0.6 miles of floodplain restoration and stream restoration at Kilby Ditch in Montgomery, Alabama. The shallow groundwater plume that discharges into the ditch contains trichloroethylene (TCE), a colorless, volatile liquid that is produced in large volumes for commercial use.
The Alabama Department of Transportation (ALDOT) developed a Corrective Measures Implementation Plan (CMIP) for Kilby Ditch to control and treat the groundwater containing TCE. Thompson Engineering provided oversight for the implementation of the CMIP, which included:
- Upper Kilby Ditch: Installation of 500-foot long, six ft. by eight ft. box culvert, excavation and slope stabilization, excavated material dewatering, water collection and treatment through a carbon filter system to remove TCE and turbidity.
- Lower Kilby Ditch: Construction of a WetlandTreatment System and hydraulic barrier, stabilizing stream banks, constructing grade and flow control structures and restoring floodplain, and constructing perimeter security fencing.
Thompson also managed environmental documents and provided progress reports throughout the 361-day project.
client
ALABAMA DEPARTMENT OF TRANSPORTATION
location
MONTGOMERY, ALABAMA
market
TRANSPORTATION
Service Specialties
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CONSTRUCTION ENGINEERING & INSPECTION
