Projects
MARINE WORK & COMMERCIAL DIVING
| Dams | Traveling Water Screens | Underwater Video System |
| Hydro Power | Trash Racks | Floating Equipment |
| Inspections | Stop Logs | Salvage |
| Raw Water Intakes | Concrete Repair/Installation | Dewatering |
| Pile Jackets | Waste-Water Pond Aeration System | Coffer Dams |
| Silt and Debris Removal | Underwater Welding and Cutting | Rack Repair/Replacement |
Windsor Cofferdam:
Finger Lakes was contracted to fabricate / install a cofferdam then remove and replace a 30” sluice gate in the dry. The project was in about 40’ of water and was on the oldest arched dam in the country. The cofferdam was built in 3 sections and bolted together in the field with a gasket. The gate was located about 100’ from shore. Bedrock and 2 wing walls were removed to make room for the base flange and cofferdam. A concrete plug was poured underwater and acted as the bottom seal and to become the new upstream floor for the gate. Portions of the existing downstream walls were removed and repaired. Two new wing walls and a downstream ogee floor were poured in place after the new gate was installed.
Dredging:
Finger Lakes was contracted to remove 400 Cubic yards of material blocking the intake of a powerhouse. This project used diver’s to pump the material away. The water was filtering though specialty designed bags placed inside multiple dumpsters. The retuning water was monitored for elevated turbidity levels to conform to DEC permitting. After dewatering and passing the paint filter test, the dumpsters were removed and sent to the landfill.
Lake Sebago:
This Project began as a cleaning and inspection of 2 -36” Sluice gates. After the inspection, one gate was revealed to be inoperable and heavy corroded. Finger Lakes designed a way to replace the gate under full head pressure. We installed a new non-rising stem sluice gate and operator access hatch.
Unit 3 Gates A and B:
Finger Lakes teamed up with another contractor to install 2 new gates including new guides. Finger Lakes was responsible for installation of and alignment of the guides. This project required saw cutting and widening of the original gate guides, then installing new stainless steel guides and lentils at each opening. After installation, the open areas of the guides and lentils were grouted in place. Each gate was approximately 10’ wide by 12’tall.
Intake Cleaning:
This intake is part of our annual cleaning program. The before and after show pictures show a dramatic difference eliminating the costly emergency repairs and shut downs due to lack of water.
Timber Ridge:
Project was to removal and reinstallation of a 24" gate valve which was located 50' down a man hole. A new intake and trash rack was required on this project due to the deterioration of the existing intake. Also required on this job was the removal of sediment built up in the emergency spill way and the mowing of the dam.
Stop Log Upgrade:
Finger Lakes upgraded this stop log door and removed steel from the intake structure. The door and door operator were removed and upgraded with a 14” gate valve recessed within the door.
Fish Ladder Armoring:
Modifications were made to the fish ladder to help prevent damage from the turbulent pool at the base of the dam. Installation of stainless steel angle irons were used. One leg of the angle was inserted into the concrete and secured with epoxy. The other leg of the angle was bolted against the face of the angle.
Concrete Tank Inspection:
Finger lakes was called in to inspect 2 concrete lined cooling tanks each holding ½ million gallon of water. The concrete tanks were suspected of having leaks which were causing inefficacy to the cooling system.
