Aberdeen Proving Ground WWTP Digester No. 1 Cover Replacement

Johnston Construction Company

• Johnston Construction Company replaced the existing floating gas-holder cover serving Digester No. 1 at the Aberdeen Proving Ground Wastewater Treatment Plant.
• JCC demolished and removed the existing digester cover and installed a new rigid steel floating gas-holder cover with the required accessories and safety equipment.
• The project included draining and cleaning Digester No. 1 so the interior structure, gas piping, and other components could be inspected.
• JCC coordinated concrete repair and protective coating work within the digester where deteriorated areas were identified.
• Existing digester gas-withdrawal piping was inspected, with damaged piping replaced using Schedule 10 Type 316L stainless steel where required.