Former Saranac Street MGP Site
| Location | Plattsburgh, New York |
| Contract Value | $39,000,000 |
| Period of Performance | August 2009 – Present |
| Role | Prime Contractor |
History & Location
The site is located on Saranac Street in the City of Plattsburgh, New York. The site is undeveloped, occupied primarily by open grassy areas with some woody vegetation including trees and shrubs along the Saranac River. The lower Saranac River is designated by the NYSDEC as a Class C River.
An electricity generating plant was constructed on a portion of the site in 1891. A coal tar lagoon was used to store waste generated by the plant. By 1949, the plant had expanded to its largest size and included three (3) gasholders. The electricity generating plant was converted to a utility garage and repair shop, and commercial businesses were established in several other site buildings. MGP operations ceased around 1960, and the site was used as a NYSEG service center until 1980. The site has been vacant since 1980.
Sediments in the Saranac River are contaminated with MGP-related materials including coal tar, sheens, and odors from earlier operations. As a result elevated levels of VOCs and PAHs have been documented. After several years of studies a remedial action work was developed for the site.
Significant Project Features
- Design/build sediment remediation and restoration project along a ½ mile of river bed and embankments required careful planning and execution. Project scheduled over multiple construction seasons
- Constructibility review was incorporated into remedial design and the project planning process. Included was the analysis of multiple remediation methodologies, impacts and costs
- Installation of 65 lf by 1,125 lf fish channel Porta-dam capable of handling river flows of 1,700 CF including a head water dam constructed with H-piles and steel plates to divert river flows
- River diversion system modified in year three (3) to cantilevered AZ48 steel sheeting with concrete block bracing for stability
- Excavation in the dry was selected sediment removal methodology
- Erection of 180 LF by 132 lf fabric structure with a stone and asphalt pad to house screening and stabilization operations. A carbon vapor extraction air handling system is operational during processing of waste materials
- Excavated sediment was transferred to stockpile area for screening and stabilization for offsite T+D
- Install and maintain a 59 LF by 13.5 lf temporary bridge for operations on opposite side of river
- Install 916 LF of AZ19 sheet pile around perimeter of job site for a NAPL collection trench
- Construct a 393 LF three tiered stacked stone wall along an eroded riverbank
- Develop and implement a HDPE bypass system for a main concrete outfall for the City of Plattsburgh
- Construct, operate and maintain on-site temporary 1,000 gpm waste water treatment plant 24 hours per day, 7 days per week
- Restoration of river bottom and embankments to original grade and contours of the river
Project Gallery
Rooted in Remedial Construction
Expanded into Environmental Dredging
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