Paw Paw Plating Site Investigation and Remediation
DLZ conducted remedial investigations, site remediation, and feasibility studies, at a former plating facility. The site had a groundwater contaminant plume with solvents (chlorinated VOCs) extending approximately a quarter of a mile from the source. The plume migrated through a residential area resulting in vapor intrusion and discharged into the Paw Paw River.
Therefore, DLZ conducted vapor intrusion investigations at the off-site residential properties and implemented vapor mitigation measures at impacted houses. In addition, DLZ conducted B-Dry and Retro-Coat application in the basement flooring, and active contaminant vapor venting system installation. Then followed remedial investigations which included Membrane Interface Probe technology, soil analysis, and vertical aquifer profiling to evaluate the extent of impacted groundwater.
DLZ conducted an Enhanced Anaerobic Bioremediation pilot test at the site utilizing Regenesis 3D Microemulsion® (3DMe) technology to enhance reductive dechlorination of chlorinated VOCs. Injection of the 3DMe was accomplished using direct-push methods with targeted injection over an approximately 10-foot interval. The pilot test included weekly to monthly monitoring of water quality parameters, groundwater sampling, and monitoring of Dehalococcoides spp. using BioTraps.
Based on the favorable results of the pilot study, DLZ implemented full-scale applications of
- 3D Microemulsion (3DMe),
- Chemical Reducing Solution (CRS),
- PlumeStop Collodial Biomatrix (PlumeStop),
- Hydrogen Release Compound (HRC) and
- Bio-Dechlor Inoculum Plus (BDI Plus)
Based on continuous monitoring; the products were applied at various areas of the contaminant plume over time to target the various chlorinated compounds. The enhanced bioremediation has achieved over 90% reduction of groundwater contamination over the entire contaminant plume.
