DEQ-CFW_00075109

Substance
Concentration
ug/L (unless otherwise noted)
Effective Date
Endosulfan sulfate
40
April 1, 2011
Endothall
100
August 1, 2010
Ethanol (ethyl alcohol)
4 mg/L
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 mg/L
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 mg/L
October 1, 2010
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
entoxide)
0.3
October 1, 2010
Vinyl Acetate
88
October 1, 2010
NORTH CAROLINA ADMINISTRATIVE CODE Eff. April 1, 2013
DEQ-CFW 00075109

APPENDIX # 1: Interim Maximum Allowable Concentrations
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.or /g_web/wq/ps/csu/ wg standards
Substance
Concentration
ug/L (unless otherwise noted)
Effective Date
Acetochlor
100
December 1, 2010
Acetochlor ESA
1 mg/L
December 1, 2010
Acetochlor OXA
1 mg/L
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
1.5 mg/L
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 mg/l
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
Diquat
20
August 1, 2010
NORTH CAROLINA ADMINISTRATIVE CODE Eff. April 1, 2013
DEQ-CFW 00075110