Onondaga Lake Superfund Site Dredging and Capping Services
| Location | Onondaga County, New York |
| Contract Value | Cost Reimbursable |
| Period of Performance | June 2000 – June 2017 |
| Role | Hydraulic Dredging and Capping |
History & Location
Onondaga Lake Superfund Site is one of the largest environmental remediation projects undertaken in USEPA Region 2. It is a 4.5 square mile lake located in the City of Syracuse, and the Towns of Salina, Geddes, and Camillus, New York. The lake drains approximately 285 square mile of the surrounding areas. Because of extensive pollution, the lake was officially listed in the NPL December 1994. The Onondaga Lake Superfund Site consists of the lake itself, several tributaries, and several upland subsites. The lake flows into the Seneca River, then into the Oswego River and Ultimately into Lake Ontario.
BACKGROUND
The availability of salt and limestone along Onondaga Lake led to the Solvay Process Company to locate along the west side of the lake in the late 19th century. In 1946, Allied Chemical initiated a mercury cell process which resulted in the discharge of waste streams containing mercury and heavy metals. There are additional sources of contamination to the lake including discharge from municipal waste water treatment plant.
As a result, surface water and sediments are contaminated. Ground water at many of the upland subsites is also contaminated. The site is being addressed through federal, state, and PRP actions. New York State is the lead agency on this cleanup. Between 1998 and March 2010, eight Records of Decision (RODs have been signed for cleanup plans at the various subsites. Selected remedies for contamination at the subsites include: dredging of sediments; excavation of soils; on and offsite treatment of contaminated materials; collection and treatment of contaminated groundwater; and capping of excavated soils and sediments.
Significant Project Features
- Hydraulic dredging of 2,140,428 CY of sediment contaminated with mercury and other COC’s
- Mechanical and hydraulic placement of 2,350,000 CY of multiple capping materials upon completion of dredging
- Construction and operation of four 600 HP electric booster pumps through a 20,000 ft pipeline
- Installation and maintenance of 20,000 lf of double wall 18 inch HDPE pipeline
- Development of custom built and automated granular activated carbon (GAC) system used in a hydraulic capping system. The GAC is mixed with sand and pumped 5,000 ft to an automated capping barge for even distribution on the lake bottom
- Participated in constructability review with the design engineer to finalize plans and specifications
- Installation of 1,600 lf of sheet pile wall in sediment with low shear stress
Project Gallery
Rooted in Remedial Construction
Expanded into Environmental Dredging
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