Village of West Nyack - PFAS Treatment at the Nyack Water Treatment Plant

Negative Declaration

Rockland County - The Village of Nyack, as lead agency, has determined that the proposed PFAS Treatment at the Nyack Water Treatment Plant will not have a significant adverse environmental impact. The action involves the Village of Nyack (Village) has detected the emerging contaminants Perfluorooctanoic acid (PFOA) and Perfluorooctanesulfonic acid (PFOS) in their primary water supply. Due to the existing NYS drinking water standards for emerging contaminants, it is critical to plan for the installation of additional treatment systems to ensure the continued operation of the Nyack Water Treatment Plant and to support year-round pumpage demands. Given the detection levels at this plant, the Village plans to design and construct a new Granular Activated Carbon (GAC) absorption system for PFOA and PFOS removal in order to meet New York State's Maximum Contaminant Levels (MCLs) (Proposed Action). The new treatment system will be housed in a newly constructed building approximately 2,150 SF in size. The new treatment facilities will include carbon vessels, a below grade clear well, associated pumps, and electrical equipment. Additional site work includes modification to the existing flood wall onsite, construction of new walkways, a gravel driveway, blowoff pit, and piping, and restoration of an existing gravel driveway. A new, larger emergency diesel generator (750kW) will replace the existing emergency generator to support these new operations. The Proposed Action Site is 9.90 acres in size, and a total of approximately 0.42 acres will be physically disturbed during construction. The project is located at 230 NY-59 Village of West Nyack, New York.