Relining Helps Remediate Lake

Edited by Matthew Phair | September 28, 2010

Alexander Wagner Co. had no problem getting to the bottom of a tricky placement job at Dahnert's Lake in Garfield, New Jersey, back in September 2007. Using a portable conveyor, Wagner moved 4,200 cubic yards of controlled fill and 3,500 tons of stone for the county of Bergen's Dahnert's Lake relining.

Matthew DelPreore, vice president for River Edge, New Jersey-based Let it Grow, says the lake was relined as a part of an overall rehabilitation to Dahnert's Lake Park. Let it Grow is the general contractor for this project. In addition, Neglia Engineering Associates, engineer for the county of Bergen, and John Biale, county project manager, were on-site as well during the project.

"There was no original lining for this lake," says DelPreore. "In addition, incoming storm water to the lake wasn't filtered by any type of system for years, and soil along with leaves built up at the lake's bottom, which in turn decreased water depth and created murky water."

"Many people visit this park every day, and we want to keep them coming back," says DelPreore. "This rehabilitation is a part of what will hopefully keep people utilizing the park and all of the things it has to offer."

During the rehabilitation project, the existing lake water and water entering at its north end were diverted out and around the lake using bypass piping and 8-inch pumps. The controlled fill and stone was able to then be conveyed by the Telebelt right onto the lake bottom.

Pairing Up

Gerry Santoro, Let It Grow's General Superintendent, recommended Alexander Wagner and their Putzmeister TB 130 Telebelt for this project based on his positive experience with the machine in the past.

Alexander Wagner was on-site for seven days, eight hours a day, conveying controlled fill and stone for the relining of the 360,000-square-foot lake. The TB 130 conveyed about 75 percent of the controlled fill and stone needed for this project.

"This was our first time working with Alexander Wagner, but we had heard their equipment is nothing but reliable and resilient," comments Santoro. "With their TB 130 we were able to convey the controlled fill and stone; without the conveyor it would not have been possible because the dump trucks and bulldozers would have been too heavy to place the material. They would have started to sink into the lake's bottom."

"The TB 130 conveyed the controlled fill on top of the liner, and then our small dozer would spread the controlled fill to make it as level as possible," says DelPreore. "After the controlled fill was placed, the TB 130 would convey and place the stone.

"It was very important the stone was placed on top of the controlled fill on the same day because the lake liner had to be protected from the rain, as well as the natural springs that were seeping through sections of the uncompleted parts of the lake relining. The stone had to cover all of the controlled fill to ensure the natural springs wouldn't flow into the finished sections and saturate the completed sections. This would result in muddy and unworkable conditions the next day."

To control the water flow of the natural springs, according to DelPreore, pumps were used during the working hours but not at night — yet another reason for making sure the stone was placed on top of the controlled fill on the same day.

The Benefits of a Single Machine

"We knew that our TB 130 was the perfect fit for this project," says Don McElroy, the Telebelt operator on this job for Alexander Wagner. "In some spots, depending on which section of the lake was being handled, we were able to reach out up to about 130 feet with the five-section TB 130 boom," says McElroy. "We were able to make this happen by removing the discharge boot, tremie and end hose. This allowed for us to extend the boom to what the job site required.

"In addition, the 18-inch (457-millimeter) belt width is a big asset for us — it handled both materials easily," comments McElroy.

In addition to their TB 130, Alexander Wagner also had their Putzmeister front-end loader hopper on hand at the job site. Ideal for loose material such as controlled fill or bulk material like stone, "the front-end loader hopper easily gobbled up the large capacity of controlled fill and stone," notes McElroy.