In the spring of 2020, the Borough of National Park was notified that a water sample tested for routine monitoring purposes resulted in levels of Perfluorononanoic Acid (PFNA) above drinking water standards.
In response to this finding, the Borough hired T&M to complete a feasibility study and full design documents for upgrading the water treatment equipment to remove the Per- and polyfluoroalkyl substances (PFAS) chemicals.
T&M is serving as the Borough’s professional engineering representative for all phases of this project including, grant/loan assistance, planning, design, permitting, construction inspection, environmental inspection and contract administration, and reviews by authorized groups or agencies.
This project is being funded with loan assistance from the New Jersey Environmental Infrastructure Financing Program, the New Jersey Environmental Infrastructure Trust Loan, and a $1 million grant issued by the USDA, Rural Development Program.
The remediation goal is to reduce concentrations of PFNA in drinking water to below the NJDEP MCL of 13 ng/L through treatment, within the timeframe set forth by the NJDEP.
The scope of work includes the installation of a permanent adsorptive water treatment system consisting of two granular activated carbon (GAC) vessels operated in a lead-lag configuration with prefiltration via bag filter housings. A piping manifold will be provided with connections for vessel influent, effluent, backwash in, and backwash discharge with valving to allow for lead-lag or parallel operation. The system will be sized for an average flow rate of 250 gpm and a peak flow rate of 500 gpm. The remedial design is anticipated to remove all PFAS compounds to within new regulatory limits. Sampling between the lead and lag vessels will be used to determine breakthrough from the lead vessel. When breakthrough occurs, the lag vessel will be placed in the lead position and the lead vessel will be exchanged and placed in the lag position.
A pre-engineered equipment building is included in the design. The building will be a clear span structure approximately 30 feet by 40 feet with overhead and personnel doors.
This investment will help over 3,000 residents in the Borough of National Park.
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