Town of Hempstead Department of Water, Granular Activated Carbon (GAC) Filtration at Wells 1 and 3

Posted on June 29, 2015

Client: Town of Hempstead Department of Water
Location: East Meadow Water District, New York
Project Type: Granular Activated Carbon (GAC) Filtration at Wells 1 and 3
Project Period: 2012
D&B Project Manager: William D. Merklin, P.E.
Project Cost: $1,874 ,000

Project Description

3D&B provided engineering services for the design and construction of a new 4.0 MGD Granular Activated Carbon (GAC) Filtration system for the Town of Hempstead Department of Water Wells 1 and 3 in the East Meadow Water District. An investigation into the possible source of the contamination indicated that the low levels of tetrachloroethylene (PCE) were not likely to increase above 50 ppb. Therefore, GAC was selected in lieu of packed tower aeration to save on costs.

Six 20,000 pound GAC vessels were installed, providing redundancy to the treatment system. The treatment units were housed in a pre-engineered metal building.

5D&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 start-up of the facility and in obtaining approvals from the Nassau County Department of Health (NCDH).

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