Ground Water Remediation Standards for 3 Constituents Revised in NJ


Effective January 16, 2018, the ground water remediation standards for three constituents were revised based on adopted amendments to Ground Water Quality Standards, N.J.A.C. 7:9C, published in the January 16, 2018 edition of the New Jersey Register (see 50 N.J.R. 334(a)). These amendments, in part, replaced the interim specific ground water quality standards with specific ground water quality standards for 23 constituents, including more stringent standards for three of these constituents.  Additionally, Appendix A of the Discharge of Petroleum and Other Hazardous Substances rule (N.J.A.C. 7:1E) was amended to add Perfluorononanoic acid (PFNA) to the List of Hazardous Substances.

  • Caprolactam: The ground water remediation standard decreases from 5,000 micrograms per liter (ug/L) to 4,000 ug/L.
  • 4,6-Dinitro-o-cresol: The ground water remediation standard decreases from 1 ug/L to 0.7 ug/L.
  • 2-Hexanone:  The ground water remediation standard decreases from 300 ug/L to 40 ug/L.

Caprolactam – Caprolactam (CPL) is an organic compound with the formula (CH2)5C(O)NH. This colourless solid is a lactam (a cyclic amide) of caproic acid. Global demand for this compound is approximately 5 million tons per year, and the vast majority is used to make Nylon 6 filament, fiber, and plastics. Caprolactam is the precursor to Nylon 6, a widely used synthetic polymer. CPL is soluble in water.

Dinitro-ortho-cresol (DNOC) is an organic compound with the structural formula CH3C6H2(NO2)2OH. It is a yellow solid that is only slightly soluble in water with no smell. Dinitrocresols are a class of manufactured chemicals that do not occur naturally in the environment. There are 18 different dinitrocresols. The most commercially important dinitrocresol, 4,6-dinitro-o-cresol (DNOC). It is used primarily for insect control and crop protection (Herbicides). It may be sold under several trade names, including Antinonnin, Detal, and Dinitrol.

2-Hexanone (methyl butyl ketone, MBK or propyl acetone ) is a ketone used as a general solvent and in paints. It is a clear, colorless liquid with a sharp odor. It dissolves very easily in water, and can evaporate easily into the air as a vapor. It dissolves cellulose nitrate, vinyl polymers and copolymers, and natural and synthetic resins. It is recommended as a solvent because it is photochemically inactive; however it has a very low safe threshold limit value. 2-Hexanone is absorbed through the lungs, orally and dermally and its metabolite, 2,5-hexanedione, is neurotoxic.

For more information about these changes, contact:

Rick Shoyer, LSRP
Senior Project Consultant