Perched Groundwater Treatment System

Project Overview

Project Description

GWTT was selected as part of the design/build team contracted to construct a perched groundwater remediation system for removal of arsenic and VOCs, as part of a large scale remediation project in Middlesex, NJ. GWTT was the general contractor for this project and has since completed major modifications to the treatment system. GWTT has performed operation & maintenance services for this treatment system since its initial startup.

GWTT’s initial scope of work included confined space activities associated with installing the duplex pump systems in existing precast sumps approximately 20-ft deep. Each duplex sump was installed with a stainless steel rail and guide system anchored to the interior sump wall. GWTT completed the installation of underground conveyance piping and electrical conduit from the sumps to the new building.

In addition, GWTT oversaw the modification to the existing slab for footer installations and erection of the pre-engineered building. The building was a Butler style structure 40-ft wide by 65-ft long and 22-ft high, with an interior office for the future system operator.

GWTT installed all the process equipment, including the solids holding tanks, clarifier, chemical feed systems, multi-media filters, sludge conditioning tank, filter press, low profile air stripper, arsenic adsorbers, and liquid phase carbon adsorbers. The building was located on a small hill with a steep access road. This required special care for offloading and placement of the larger equipment, such as the 28-ft long clarifier and 20-ft long conical bottom tanks, since they had to be installed after the building was erected. After the process equipment and main control panel were set, GWTT completed the installation of the interior process piping and electrical conduit.

GWTT is currently the operation & maintenance provider for this treatment system.

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