Town of Hempstead Department of Water, Granular Activated Carbon (GAC) Filtration at Well 7

Posted on June 25, 2015

Client: Town of Hempstead Department of Water
Location: Roosevelt Field Water District, New York
Project Type: Granular Activated Carbon (GAC) Filtration at Well 7
Project Period: 2010 - 2011
D&B Project Manager: William D. Merklin, P.E.
Project Cost: $1,300,000

Project Description

TOH-RF-7---1D&B provided engineering services for the design and construction of a new 1,400 gpm Granular Activated Carbon (GAC) Filtration system at the Town of Hempstead Department of Water Well 7 in the Roosevelt Field Water District. The facility was constructed on a remote site where the chemical treatment for Well 7 is located as well as two other water supply wells for the District. An investigation into the possible source of the contamination indicated that the low levels of tetrachloroethylene (PCE) were not likely to increase about 10 to 20 ppb. Therefore, GAC was selected in lieu of packed tower aeration.

TOH-RF-7---2Soil investigations found a small area of petroleum contamination which was excavated from the building foundation area and removed from the site in accordance with New York State Department of Environmental Conservation (NYSDEC) regulations.

Four 20,000 pound GAC vessels were installed, providing 100 percent redundancy to the treatment system. The treatment units were housed in a pre-engineered metal building.

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

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