Case Study
Storm Sewer
T&R Environmental was the successful bidder on the City of Corning Stormwater Sewer Replacement project on the banks of the Cohocton River. The project required replacement of 600 feet of 5-foot reinforced concrete pipe (RCP) along with several large vertical structures as specified by NYSDOT and depths of up to 30 feet below ground surface through a former hazardous waste dump site. Specialized slide rail shoring was used as the preferred shoring method as NYSDEC and Army Core of Engineers prohibited the use of traditional sheet piling due to adjacent flood control dike vibration sensitivity. The project also required the construction of a temporary drainage diversion to prevent flooding along with specialized containment and storage of excavated soil and groundwater. All pipeline replacement and construction were strictly governed by the NYSDEC and the approved Article 16 Flood Control Land Use Permit.
Client: City of Corning
Start Date: October 2019
Duration: 8 months
Budget: $2.5 million (Phase 1 and 2)
Location: Corning, NY
Tasks & Highlights
Complete project management from bidding, bonding, construction, and project closeout.
Construction of Article 16 approved Flood Control Land use access roads along with soil and groundwater containment areas. This included the construction of several engineered soil stockpile management areas and placement of several company owned frac tanks.
Implementation of slide rail shoring system with specialized modular components to account for larger concrete vertical structures. Shoring system was designed and engineered to depths of over 30 feet below ground surface requiring use of company owned long reach dredging type excavators to remove material between slide rail boxes.
Use of specialized equipment and rigging to place large concrete pipe sections and concrete vertical structures with weights up to 50,000lbs. at depths of over 30 feet. All pipes and concrete structures were set in place utilizing the last in 3D GPS and Grade control technology.
Excavated and stockpiled soils that tested high for RCRA metals were treated Blastox, re-tested, and transported to permitted landfill as non-hazardous waste. Over 3000 tons of contaminated soil was handled in this manner saving the client from larger Hazardous Waste tip fees.
All concrete pipe was air tested and video checked prior to backfill to ensure all engineered specifications were met as noted per NYSDOT specs.
All backfill measures required compaction testing to within specs within 95% with the top two feet of material screened and to act as a cap for future site use. All screening activities were handled by T&R Environmental owned equipment and employees.
Final grading was handled by utilizing equipment mounted 3D grade control equipment and was performed to the exact specifications as outlined the Article 16 Permit and NYSDEC/ Army Core of Engineers requirements. Final graded site was hydro- seeded with approved NYSDOT/ NYSDEC flood control land seed mix.
Photo 1
Installation of over 600 linear ft of engineered slide rail shoring to depths of 25 feet thru know hazardous waste site
Photo 2
Installation of 60″ Reinforced concrete pipe at depths of over 30′
in hazardous material conditions.
Photo 3
Soil Stabilization utilizing Blastox® at a concentration of 3% by volume to bring Lead TCLP (MEMJ levels below acceptable levels
to allow material to be disposed of at local NYS Landfill.