Challenges
  • Kenny/Obayashi IV, a Joint Venture (K/O) was chosen by the Metropolitan District to construct the tunnel and drop shaft portions of the South Hartford Conveyance and Storage Tunnel (SHCST).
  • K/O chose Zuvic Carr to assist it with the management of soil, treatment of groundwater and permitting.
  • Some of the soil fill at the tunnel launch shaft site contained polychlorinated biphenyls (PCBs) and was subject to the requirements of the Toxic Substances Control Act (TSCA). Up to 15 feet of soil over a 4-acre area required removal for construction.
Solutions
  • Zuvic Carr is providing Qualified Environmental Professional (QEP) services for the project and prepared Soil, Tunnel Muck, and Water Management Plans and a soil staging permit.
  • Prepared stormwater pollution control plan and permit, groundwater discharge permits, design of groundwater treatment system and we complete periodic sampling of discharges for compliance purposes.
  • Completes in-situ and ex-situ soil and rock sampling and characterization for reuse or disposal.
  • Designates facilities acceptable for soil reuse and disposal based on material characterization
  • Zuvic Carr completed investigations for PCBs in a grid pattern in accordance with Subpart N of TSCA and prepared Notification of Cleanup for submission to EPA and CT DEEP.
  • Completed verification sampling after soil was removed in accordance with Subpart O of TSCA and prepared a report documenting the removal, management and off-site disposal of the soil, and the results of verification sampling.
Highlights
  • Kenny/Obayashi remained on its construction schedule despite the extra challenges presented by the PCB-contaminated soil.
Need a solution?