Conti Federal
Edison, NJ 08817
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Imperial Oil Superfund Site Slurry Wall
Project Information
- Project Location:
- Marlboro Township, NJ
- Approx Contract:
- $50,000,000
- Status:
- Completed
- Structure Type:
- Government
References
- Client:
- USACE Kansas City
Scope Of Work
Key features
Constructed structural slurry wall (2,600 linear feet)
Installed sheeting (25-foot panels) in slurry trenches
Excavated soil (290,000 tons)
Backfilled and graded
Constructed temporary water plant
Sampled wastes onsite
Transported and disposed of wastes
Restorated site and wetlands
Through creative value engineering, Conti designed and constructed an enormous hydraulic barrier slurry wall system to 74-foot depths.
Amid a residential suburban area, harmful contamination was found in the sandy soils of a 15-acre site where factories such as Imperial Oil and Champion Chemical had operated 1917. Contamination included volatile organic compounds, PCBs, polycyclic aromatic hydrocarbons, petroleum hydrocarbons, phthalates from plastics, metals, lead and arsenic. The surrounding wetlands and residences were at risk from these harmful contaminants, so the area was designated a Superfund site and the United States Army Corps of Engineers enlisted Conti to clean it up.
Conti performed large-scale soil excavation and groundwater remediation including hydraulic containment of the site and large scale load out and disposal of 180,000 cubic yards of excavated material. The team implemented unique separation techniques to avoid cross contamination, including in-situ sampling for waste characterization of hazardous and nonhazardous soils for offsite treatment and disposal. The team also designed, procured and installed a 300 gallon-per-minute water treatment plant onsite.
A major feature of the project was the construction of a complex soil-bentonite hydraulic barrier structural slurry wall with up to 74-foot depths around the site perimeter. Conti performed value engineering to redesign the alignment of the wall to lessen impact to excavation and dewatering limits, as well as to avoid nearby high voltage power lines and residences.
Along with the slurry wall, which saved the over $2 million, Conti provided innovative ideas such as excavation and load out methodologies increasing efficiency and saving time and costs.
