"E" Designation Program and Dewatering  Permitting  for Waterfront  Mixed-Use Development

Project: 10 Jay Street
Location: Brooklyn, New York
Services: NYCOER "E" Designation Program Sub-Slab Depressurization System Soil Excavation,Transport, and Disposal Remedial Oversight, Regulatory Coordination, NYCDEP Dewatering Permitting

The Site consists of a 19,682 square foot lot occupied by a 9-story industrial building. The development plans for this building included renovating the building with no soil excavation.The Site is associated with an “E” designation for Noise and Hazmat Materials.

The Hazmat “E” process requires performing a Remedial Investigation (RI) and included installation and sampling of three sub-slab vapor probes. Based upon the findings of the RI, a Remedial Action Work Plan (RAWP) was prepared to inform the installation of a sub-slab depressurization system (SSDS),and a composite cover system.

A Noise RAP, which stipulates the window attenuation requirements and alternate means of ventilation for the proposed development was also prepared for this site. Upon approval of the Hazmat and Noise RAWP, the NYCOER then issued a Notice to Proceed (NTP) for construction activities.

During construction activities, it was determined that the elevator pit area would require excavation, and soil disposal would take place. Hydro Tech coordinated this deviation with the NYCOER and prepared a stipulation list. The stipulation list states that a vapor barrier would be placed beneath the elevator pit area, endpoint samples would be collected, and an active SSDS consisting of 2 pits would be installed.

Additionally, Hydro Tech would properly characterize soil for disposal and ensure that all soil would be properly disposed of.

It was also determined that the excavation for the elevator pits would extend below the water table and that dewatering would be required. As a result, Hydro Tech was also involved in filing and securing a NYCDEP Dewatering Permit for this site.