The regional trash authority board voted Wednesday to award a $99,140 contract for engineering and environmental services to determine how much impact on wetlands will be necessary to build a pair of trash cells at the regional landfill in Suffolk.

HDR Engineering will perform the work on Cells VIII and IX, along with support areas, and will assist the Southeastern Public Service Authority with coordinating with the U.S. Army Corps of Engineers to initiate the environmental impact statement for the two-cell expansion at the regional landfill.

HDR Engineering is to determine the wetlands on the area proposed for the two cells, and the 129 acres of support facilities, according to the service agreement. It will also provide SPSA with a list of qualified third-party companies to complete the environmental impact statement under the U.S. Army Corps of Engineers’ direction.

While at the site, the service agreement notes that HDR will also determine, for future reference and incorporation in the environmental impact statement, the areas proposed for three additional future cells. That area makes up about 220 acres.

HDR will also prepare a jurisdictional wetlands report to submit to the U.S. Army Corps of Engineers.

When the work is complete, the U.S. Army Corps of Engineers will be able to develop a clear scope of work for the project to begin, the service agreement states.

The work is scheduled to take place through June, according to the service agreement.