Port Washington Water District, Granular Activated Carbon (GAC) Filtration at Neulist Avenue Pumping Station

Posted on May 20, 2015

Client: Port Washington Water District
Location: Port Washington, New York
Project Type: Granular Activated Carbon (GAC) Filtration at Neulist Avenue Pumping Station
Project Period: 2001 - 2003
D&B Project Manager: William D. Merklin, P.E.
Project Cost: $900,000

Project Description

PWWD-GACD&B provided engineering services for the design and construction of a new 1,400 gpm Granular Activated Carbon (GAC) Filtration system at the Neulist Avenue Pumping Station for the Port Washington Water District. The Neulist Avenue site had three existing well pumps with a total combined pumping capacity of just below 1,400 gpm. Two of the three wells had low but increasing concentrations of VOC contaminants. The site was therefore suitable for the use of GAC filtration. All three wells were connected to the new treatment system.

Two 20,000 pound GAC vessels were installed partially below grade with a metal building enclosure above grade. The vessels are capable of being operated in either a series mode at a flow rate of 700 gpm or in parallel mode at a flow rate of 1,400 gpm.

Project challenges included a structural design that incorporated a special foundation that would not impact existing drain drains for the adjacent 20 MG storage tank.

D&B prepared the preliminary design report, contract drawings and contract specifications for this project. Construction phase services included site inspection as well as project administration. D&B assisted the District in obtaining approvals from the Nassau County Department of Health (NCDH).

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