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Cedar Swamp Brook Relocation
Johnston, RI

The Rhode Island Resource Recovery Corporation (RIRRC) is responsible for the Central Landfill, a 1,500-acre, 3,000-ton-per-day, state-of-the-art, municipal solid waste landfill—the largest active landfill in New England.  To provide additional landfill capacity until the year 2012, Phase V Expansion of the landfill required the relocation of 3,100 linear feet of Cedar Swamp Brook.  PARE was the principal design and permitting consultant for this project from its inception in 1996 to its final design and construction in 2003.

Final design was a combination of culvert and open channel.  The use of the culvert saved valuable land space for the RIRRC by providing an area to locate a detention pond above the relocated stream.  Using this design approach, approximately 32 acres of useable land was created for landfill expansion.

PARE prepared a Significant Wetlands Alteration Permit for approval by the RIDEM, Army Corps of Engineers, Fish and Wildlife, and EPA.  The application’s innovative design included preparation of detailed wetland creation and planting plans for the stream channel and adjacent ponds, and the incorporation of weirs to control storm-flow energy and to create wildlife pools.  Hydrology and hydraulic calculations for the proposed relocated stream were also performed, including the evaluation of a 1,280-acre watershed.

This project also included the installation of four roadway culverts (8 to 20 feet in width), two sedimentation/detention ponds, the reconfiguration of an existing pond, the relocation of five pressurized pipelines, and design of 5,000 feet of landfill access roads.  PARE prepared construction documents and assisted the RIRRC with contractor solicitation and award, construction administration, and construction oversight.