Ada Pond Sediment Investigation, Remedial Design, and Construction Management
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Rio Tinto has responsibility for this site through its subsidiary company, Alcan Global Pharmaceutical Packaging Inc. (Alcan). The 48-acre site has a long history of industrial use, primarily for glass manufacturing.

Alcan is identified as the responsible party for conducting the remediation of the property under the NJDEP Industrial Site Recovery Act and is engaged in environmental investigation/remediation at this site. Ada Pond is a 2.9-acre pond located in the west-central portion of the site that received noncontact cooling water and stormwater runoff and also served as a source of water for fire protection. Two distinct layers of geologic material (Stratum 1 and Stratum 2) were identified beneath Ada Pond. Stratum 1 consisted of fine-grained deposits containing elevated levels of extractable petroleum hydrocarbons (EPH), PAHs, PCBs, and metals. Stratum 2 consisted of native sand with elevated concentrations of EPH, PAHs, PCBs, and metals in isolated areas. Geosyntec was retained to conduct a predesign investigation, perform the remedial design (RD), and to ultimately obtain regulatory closure of the Ada Pond system.

Scope of Services

Geosyntec completed the combined remedial investigation report/remedial action work plan (RI/RAWP), as well as predesign investigation activities, dewatering tests, construction drawings and specifications, permitting, construction oversight, and a remedial action report. The predesign investigation activities included vibracoring and sediment probing to create dredge prisms, as well as conducting a bathymetric survey and dewatering tests. The dewatering tests were conducted to evaluate possible dewatering approaches to be used during the dredging operation and any stabilization requirements for disposal.These tests evaluated various polymers to be used for Geotubes in a hydraulic dredging scenario as well as dewatering amendments to be applied in a mechanical dredging approach. The RD included dredging 12,000 cubic yards of impacted sediments, dewatering sediments, disposing of sediments at an approved off-site landfill, and placing six inches of clean sand backfill Geosyntec was the design engineer who prepared the construction drawings and specifications and participated in the contractor procurement activities. Two contractors were solicited—one for remedial construction and one for transportation and disposal. We provided full-time construction oversight and quality assurance during the remedial construction.

Notable Accomplishments

Geosyntec completed the investigation and construction with zero lost-time incidents. Geosyntec prepared a combined RI/RAWP to expedite the schedule and, working closely with the NJDEP Land Use Regulation Program, determined that Ada Pond was an unregulated water body, which reduced permitting requirements. Additionally, we evaluated contracting options for the transportation and disposal of the sediment, which determined that the project would realize cost savings by contracting directly with Rio Tinto. We developed and implemented an in-situ waste characterization sampling program and assisted the client with preparation of waste profiles which expedited acceptance of material at the receiving facilities and reduced the need for on-site stockpiling. Finally, to achieve site closure goals established by Rio Tinto, dredging operations were completed through the winter months.

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Project Summary

  • Location: Millville, New Jersey
  • Client: Rio Tinto AuM Company
  • Project Practice Areas: Contaminated Sites, Water and Wastewater
  • Type of Facility: Glass manufacturing
  • Services Provided: U.S. Army Corps of Engineers (USACE) Permitting, Predesign investigation, Remedial design, Sediment dewatering, Dredging and capping, Construction oversight, Transportation and disposal
  • Type of Work: Feasibility study and sediment remediation
  • Governing Regulation: New Jersey DEP