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Graven's Island CDF Emptying Graven's Island CDF Emptying Graven's Island CDF Emptying

Restoring navigation and protecting wetlands

A "floating road" made it possible to remove dredged material from the Graven's Island Confined Disposal Facility.

The haul road designed by Mott MacDonald is a modern adaptation of a technology used by 19th century railroad engineer George Stephenson.

Opportunity

Since the 1970s, the Borough of Avalon has used the Graven’s Island Confined Disposal Facility (CDF) to dispose of material dredged from channels, harbors, and boat slips in the back bays.

However, upon completion of a dredging project in 2009, the CDF was filled to capacity and unable to accept additional dredged material. A suitable site had to be found for up to 180,000 cubic yards (137,000 cubic meters) of material that remained to be removed from the back bay waterways.

Solution

An alternatives analysis conducted by Mott MacDonald concluded that the most viable alternative was to empty the Graven’s Island CDF. This presented a challenge since the CDF is located approximately one-half mile from the nearest roadway.

After considering various methods of removal, we recommended the construction of a haul road from Avalon Boulevard to the CDF. We completed the design and prepared plans and specifications for constructing a “floating” road to the CDF, excavating and removing the existing dredged materials, and hauling the materials to a processing facility.

The haul road designed by Mott MacDonald represents a modern adaptation of a technology used by the famous 19th century British railroad engineer George Stephenson, who used bound heather and branches as a bed for the stone railroad base across a peat bog.

Outcome

The project proceeded on schedule and the CDF was emptied by November 2014. The emptying of the CDF allowed the immediate dredging of critically shoaled waterways in the Borough’s back bays, improving recreational and commercial boating safety and navigability by emergency vessels.

The haul road alignment and cross section were designed to reduce environmental disturbance. About 144,000 cubic yards (110,000 cubic meters) of material, traditionally considered “spoils,” was sent to a materials processing facility for blending and beneficial reuse.

Avalon’s decision to empty and reuse its confined disposal facility minimized environmental impact and made the site available to Middle Township and the New Jersey Department of Transportation for their own dredging projects. The township and NJDOT contributed $1.5 million to the cost of emptying the CDF.

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