AttachmentA_ExistingIMACs

NORTH CAROLINA ADMINISTRATIVE CODE Eff. April 1, 2013
APPENDIX # 1: Interim Maximum Allowable Concentrations (IMACs) Interim Maximum Allowable Concentrations (IMAC) shown in the table below are those established
under 15A NCAC 02L .0202. For more information, contact the Division of Water Quality Planning Section at [phone] or the web site at: http://portal.ncdenr.org/web/wq/ps/csu/gwstandards

Substance Concentration ug/L Effective Date
Acetic Acid 5000 April 4, 2018
Acetochlor 100 December 1, 2010
Acetochlor ESA 1000 December 1, 2010
Acetochlor OXA 1000 December 1, 2010
Acetophenone 700 April 1, 2011
Acrolein 4 October 1, 2010
Alachlor 0.4 August 1, 2010
Aldrin 0.002 October 1, 2010
Ammonia 1,500 August 1, 2010
Antimony 1 August 1, 2010
Benzaldehyde 700 April 1, 2011
Benzyl Alcohol 700 October 1, 2010
Beryllium 4 October 1, 2010
Bromomethane 10 August 1, 2010
Butanol, n- (n-butyl alcohol) 700 August 1, 2010
Butanol, sec- (sec-butyl alcohol) 10,000 October 1, 2010
Butanol, tert- (tert-butyl alcohol) 10 June 1, 2011
Carbazole 2 April 1, 2011
4-Chlorotoluene 24 October 1, 2010
Cobalt 1 October 1, 2010
Dalapon 200 August 1, 2010
Dibenzofuran 28 May 24, 1999
1,4-Dibromobenzene 70 August 1, 2010
Dibromomethane 70 October 1, 2010
Dichloroacetic Acid 0.7 October 1, 2010
1,2-Dichloroethylene, mixed isomers 60 October 1, 2010
2,4-Dichlorophenol 0.98 August 1, 2010
DDE 0.1 August 1, 2010
Dinoseb 7 August 1, 2010
Diphenyl ether 100 April 1, 2011
2,4-Dinitrotoluene 0.1 April 1, 2011
NORTH CAROLINA ADMINISTRATIVE CODE Eff. April 1, 2013
Substance Concentration ug/L Effective Date
Diquat 20 August 1, 2010
Endosulfan sulfate 40 April 1, 2011
Endothall 100 August 1, 2010
Ethanol (ethyl alcohol) 4,000 April 1, 2011
Ethyl tert-butyl ether (ETBE) 47 April 1, 2011
alpha-Hexachlorocyclohexane 0.006 April 1, 2011
beta-Hexachlorocyclohexane 0.02 April 1, 2011
2-Hexanone 40 April 1, 2011
4-Isopropyltoluene (p-cymene) 25 April 1, 2011
Methyl Isobutyl Ketone 100 December 1, 2010
Methyl methacrylate 25 August 1, 2010
1-Methylnaphthalene 1 April 1, 2011
2-Methyl phenol (o-cresol) 400 April 1, 2011
Perchlorate & Perchlorate Salts 2 December 1, 2010
Perfluorooctanoic acid (PFOA; C8) 2 December 6, 2006
Picramic Acid 0.7 October 1, 2010
Polychlorinated Biphenyls 0.09 October 1, 2010
Propylene Glycol 140,000 July 16, 2012
Tert-Amyl Methyl Ether (TAME) 128 April 1, 2011
1,2,4,5-Tetrachlorobenzene 2 August 1, 2010
1,1,1,2-Tetrachloroethane 1 August 1, 2010
Thallium 0.2 October 1, 2010
Tin 2,000 October 1, 2010
p-Toluic Acid 35 April 4, 2018
1,1,2-Trichloroethane 0.6 August 1, 2010
2,4,5-Trichlorophenol 63 October 1, 2010
2,4,6-Trichlorophenol 4 October 1, 2010
Vanadium (excluding vanadium pentoxide) 0.3 October 1, 2010
Vinyl Acetate 88 October 1, 2010