A large manufacturing company in Connecticut retained Loureiro to perform the remediation of wetlands/watercourses that had been impacted with polychlorinated biphenyls (PCBs), metals, petroleum hydrocarbons, and various other organic compounds. The work included dredging activities within approximately three acres of brook, pond, and swamp, the installation of a geosynthetic and earthen cap within the brook and pond, the construction of a geo-composite cap along the banks of the brook and pond and the reconstruction of several hundred feet of a 4-lane road. The project was completed in two phases and ultimately resulted in the excavation and offsite disposal of nearly 90,000 tons of PCB-impacted materials.
The project scope included:
- Temporary relocation of 2,200 ft. of stream and installation of a temporary lined by-pass channel
- Design and operation of a 400 gpm dewatering wastewater treatment system
- Disposal of nearly 90,000 tons of PCB-impacted material
- Excavation and relocation of over 200,000 cubic yards of material
In addition, Loureiro removed 3 large (10,000 gallon) underground storage tanks, removed and reinstalled 200 linear feet of a 108-inch diameter corrugated metal pipe (CMP), installed HDPE (40 mil) liner, reconstructed the roadway, added a new drainage system, removed and reinstalled fencing, the roadway lighting and guardrail.
Loureiro performed the installation of a “first of its kind” subaqueous cap. The second phase of this project was performed under an accelerated schedule. Loureiro finished the project with time to spare.