Schoolcraft Remediation Site In Situ Bioremediation, Carbon Tetrachloride
FTCH was retained by the State of Michigan to design a full-scale bioaugmentation system based on a field pilot study performed by Michigan State University in the Village of Schoolcraft, Michigan. FTCH’s work also included construction oversight and full-scale operation of the system. The pilot involved testing the feasibility of a specialized strain of pseudomonas bacteria to remediate a half-mile long carbon tetrachloride (CCl4) plume 300 feet wide and 90 feet deep. The goal was to establish and maintain a biologically active zone using tightly spaced wells at the lead edge of the contaminant plume. FTCH designed a system including 110 bidirectional extraction/injection wells (a complicated array of distribution piping and a pH adjustment system that maintained the groundwater pH at 8.0 to 8.4 pH units) and a computer interfaced monitoring and control system. The system was designed to accommodate specific project requirements such as avoiding wetted metals parts, continuous sloping of piping to facilitate draining, and incorporation of a piping and tank sterilization system.