Sediment Remediation Acid Brook Delta Dredging and Dewatering

History & Location

The former Pompton Lakes Works (PLW) facility commenced operations in the early 1900s. Following the cessation of site activities in 1994, the PLW was gradually dismantled and closed. Remedial activities on the site included soil excavation, post-excavation sampling, backfilling, and site restoration. Between 1991 and 1997, Acid Brook underwent remediation through streambed cleaning and excavation of adjacent floodplain soils.

Significant Project Features

• Hydraulic dredging of 147,000 CY of mercury-contaminated lake sediments from water depths ranging from 2.5–6 ft
• In-situ mechanical excavation of 7,800 CY of contaminated upland soils, spanning 17 areas of the site, with depths ranging from 0.5 – 8.5 ft
• Implemented a turbidity containment system for hydraulic and mechanical excavation operations
• Debris removal prior to and during dredging operations
• Dewatering and processing of approximately 70,000 tons of hydraulically dredged lake sediment
• MAECTITE™ stabilization treatment of approximately 500 CY of lead-contaminated soil/sediment
• Facilitated offloading and T&D operations of excavated/dredged sediment material for disposal at an approved landfill facility
• Executed site rehabilitation operations, placed backfill material, and restored the site to preexisting lines and grades

Project Gallery