Construction - Connecticut Resources Recovery Authority

Construction geared toward protecting public health and the environment.

The bottom of the ash landfill is comprised of a system of carefully engineered layers installed under a comprehensive construction quality assurance program. This ensures that an ash landfill is built to the highest standards.

Although the construction requirements are prescribed by state Department of Environmental Protection (DEP) and the U.S. Environmental Protection Agency (EPA), CRRA’s plans for constructing the ash landfill will be even more protective than the DEP and EPA requirements, and will therefore provide an even greater degree of protection of public health and the environment.

There will be a minimum of five feet of soil between the bottom layer of the ash landfill and the groundwater. This will include an up-to-24 inch layer of special, engineered, compacted soil or special engineered liner. Above this there will be two thick plastic liners, each between 60 mil and 80 mil thick; three different layers of special fabric, one of which has special clay sandwiched between two layers of the fabric; and a layer of washed stone or sand.

On top of the liner systems, drainage layers with piping and pumping systems will be installed to safely collect and remove for safe disposal any water that may come into contact with the ash.

Review a cross section of an ash landfill.



	Construction geared toward protecting public health and the environment. The bottom of the ash landfill is comprised of a system of carefully engineered layers installed under a comprehensive construction quality assurance program. This ensures that an ash landfill is built to the highest standards. Although the construction requirements are prescribed by state Department of Environmental Protection (DEP) and the U.S. Environmental Protection Agency (EPA), CRRA’s plans for constructing the ash landfill will be even more protective than the DEP and EPA requirements, and will therefore provide an even greater degree of protection of public health and the environment. There will be a minimum of five feet of soil between the bottom layer of the ash landfill and the groundwater. This will include an up-to-24 inch layer of special, engineered, compacted soil or special engineered liner. Above this there will be two thick plastic liners, each between 60 mil and 80 mil thick; three different layers of special fabric, one of which has special clay sandwiched between two layers of the fabric; and a layer of washed stone or sand. On top of the liner systems, drainage layers with piping and pumping systems will be installed to safely collect and remove for safe disposal any water that may come into contact with the ash. Review a cross section of an ash landfill.	Workers position a piece of thick, plastic liner over the compacted soil base. This piece of plastic liner will be welded to the adjacent pieces of plastic liner. This ash landfill “cell” under construction shows compacted soil base, a thick, plastic liner, and a drainage layer. The berm is designed to contain water to be collected for safe disposal. Construction of this ash landfill cell is complete and the landfill has begun to receive ash.