Piston Ring Plating Facility In Situ Hexavalent Chromium Reduction
FTCH was contracted by an international automotive manufacturer to remediate hexavalent chromium (Cr+6) contaminated building materials, and subsurface soils and groundwater. The source of the Cr+6 was from the operation of 14 chrome plating lines. The Cr+6 remediation was accomplished using in situ injection of calcium polysulfide to reduce the chromium to an immobile form. FTCH performed the investigations, bench scale and pilot testing, design, remedial actions, and performance monitoring. The remediation program included chemical injection in the saturated and unsaturated source area zones. The in situ remediation was successful in meeting the cleanup goals in the source area, as well as allowing for natural attenuation for residual Cr+6 in downgradient groundwater.