4611494 Environment, District Department of the - Notice of Final Rulemaking - District of Columbia Water Quality Standards

District DEPARTMENT OF THE ENVIRONMENT

 

NOTICE OF FINAL RULEMAKING 

 

District of Columbia Water Quality Standards

 

The Director of the District Department of the Environment (DDOE), in accordance with the authority set forth in the District Department of the Environment Establishment Act of 2005, effective February 15, 2006 (D.C. Law 16-51; D.C. Official Code § 8-151.01 et seq. (2012 Repl.)), Sections 5 and 21 of the Water Pollution Control Act of 1984, effective March 16, 1985 (D.C. Law 5-188; D.C. Official Code §§ 8-103.04 and 8-103.20 (2012 Repl.)), and Mayor’s Order 2006-61, dated June 14, 2006, hereby gives notice of final rulemaking action to amend Chapter 11 (Water Quality Standards) of Title 21 (Water and Sanitation) of the District of Columbia Municipal Regulations (DCMR).

 

On August 30, 2013, DDOE published the Notice of Proposed Rulemaking in the D.C. Register at 60 DCR 012420.  Electronic notice was also sent directly to interested parties identified by DDOE. On October 3, 2013, DDOE conducted a public hearing to solicit comments on the rulemaking.  DDOE carefully considered the comments received for this rulemaking. All comments received were supportive of the revised criterion.  No substantive changes have been made to the proposed rules as published on August 30, 2013. Final rulemaking action was taken on October 23, 2013, and the rules will become effective on the date of publication of this notice in the D.C. Register.

 

Summary of changes from the 2010 Water Quality Standards:

 

DDOE  conducted its Triennial Review of the District of Columbia’s Water Quality Standards as required by Section 303(c) of the Federal Clean Water Act (CWA) (33 U.S.C. § 1313 (c)) and the District’s Water Pollution Control Act of 1984.  It is DDOE’s goal to continue to update and make available the latest scientific findings in the ambient water quality criteria that are used to restore and protect the quality of District waters.  DDOE considered the environmental, technological, institutional, and socio-economic impact of the revised criterion on the application and enforcement.

 

DDOE revised the aquatic life numeric criteria for Acrolein from 10.0 µg/L to 3.0 µg/L, a more stringent criteria (§ 1104.8, Table 3). This change was based on EPA toxicity data and other information on the effects of Acrolein that were obtained from EPA’s internal and external peer review, including scientific input from the public.  The revised criteria will protect most aquatic   species from adverse effects due to Acrolein exposure.  Acrolein is used as biocide and herbicide to control algae, aquatic weeds and mollusks in recirculating process water systems.  Acrolein can enter the aquatic environment by its use as an aquatic herbicide, from industrial discharge, and from the chlorination of organic compounds in drinking water and wastewater treatment.  Monitoring studies conducted after field application show that Acrolein can be transported up to 61 miles from the point of application. See Ambient Aquatic Life Water Quality Criteria for Acrolein, (CAS Registry Number 107-02-8), (EPA 822-F-09-004), August 2009.

 

This rulemaking also establishes the aquatic life numeric water quality criteria for Carbaryl pesticide (§ 1104.8, Table 3).  The major uses of Carbaryl include insect control on lawns, home gardens, fruit orchards, forage and field crops, ornamentals, forests, turf, shade trees, poultry and pets.  Carbaryl is toxic and potentially harmful to aquatic life and can enter water bodies via runoffs.  Carbaryl is the second most frequently found insecticide in water with detections in approximately 50 percent of urban streams. See Aquatic Life Ambient Water Quality Criteria for Carbaryl (CAS Registry Number 63-25-2), (EPA-820-R-12-007), April 2012.

 

All other provisions, tables and definitions in the chapter remain unchanged.

 

Section 1104.8 of Chapter 11 (Water Quality Standards), Title 21 of the District of Columbia Municipal Regulations, is amended as follows:

 

1104.8             Unless otherwise stated, the numeric criteria that shall be met to attain and maintain designated uses are as follows in Tables 1 through 3:

 

                                              TABLE 1 – NUMERIC CRITERIA

 

Constituent				Criteria for Classes
				A	B	C
Bacteriological (MPN/100 mL)
	E. coli1
		Geometric Mean (Maximum 30 day		126
			geometric mean for 5 samples)
		Single Sample Value		410
Physical
Dissolved Oxygen (mg/L)         Instantaneous minimum (Year-round) 2						5.0
		February 1 through May 31 3,5
			7-day mean			6.0
			Instantaneous minimum			5.0
		June 1 through January 31 3,5
			30-day mean			5.5
			7-day mean			4.0
			Instantaneous minimum 4			3.2
	Temperature (oC)
		Maximum				32.2
		Maximum change above ambient				2.8
	pH
		Greater than		6.0	6.0	6.0
		And less than		8.5	8.5	8.5
	Turbidity increase above ambient (NTU)			20	20	20
	Secchi Depth 3,5 (m)(seasonal segment average)
		April 1 through October 31				0.8
Total dissolved gases (maximum % saturation)						110
Hydrogen Sulfide (maximum μg/L)						2.0
Oil & grease (mg/L)						10.0
Biological
	Chlorophyll a 3,5 (μg/L)(seasonal segment average)
		July 1 through September 30				25

 

Notes:

¹ The geometric mean criterion shall be used for assessing water quality trends and for permitting.  The single sample value criterion shall be used for assessing water quality trends only.

 

² This criterion applies to nontidal waters.

 

³ Attainment of the dissolved oxygen, water clarity and chlorophyll a water quality criteria that apply to tidal influenced Class C waters will be determined following the guidelines documented in the 2003 United States Environmental Protection Agency publication: Ambient Water Quality Criteria for Dissolved Oxygen, Water Clarity and Chlorophyll a for the Chesapeake Bay and its Tidal Tributaries, EPA-903-R-03-002, April 2003, Region III Chesapeake Bay Program Office, Annapolis, Maryland; 2004 Addendum, EPA-903-R-04-005, October 2004; 2007 Addendum, EPA 903-R-07-003 CBP/TRS 285/07, July 2007; 2007 Chlorophyll Criterion Addendum, EPA 903-R-07-005 CBP/TRS 288-07, November 2007; 2008 Addendum, EPA 903-R-08-001 CBP/TRS 290-08, June 2008; and 2010 Criterion Addendum EPA 903-R-10-002 CBP/TRS-301-10, April 2010.  

 

⁴ At temperatures greater than 29^oC, in tidally influenced waters, an instantaneous minimum dissolved oxygen concentration of 4.3 mg/L shall apply.

 

⁵ Shall apply to tidally influenced waters only.

 

TABLE 2 – NUMERIC CRITERIA

 

Constituent1	Criteria for Classes
Trace metals and inorganics in μg/L, except where stated otherwise (see Notes below)	C		D2
	CCC 4-Day Avg	CMC 1-Hour Avg	30-Day Avg
Ammonia, total mg N/L	See Note 7	See Note 8
Antimony, dissolved			640
Arsenic3, dissolved	150	340	0.14c
Cadmium4,5, dissolved	[I]CF	[I.A]CF
Chlorine, total residual	11	19
Chromium4, hexavalent, dissolved	11 CF	16 CF
Chromium4,5, trivalent, dissolved	[II]CF	[II.A]CF
Copper4,5, dissolved	[III]CF	[III.A]CF
Cyanide, free	5.2	22	140
Iron, dissolved	1000
Lead4,5, dissolved	[IV]CF	[IV.A]CF
Mercury4, total recoverable	0.77	1.4	0.15
Methylmercury (mg/kg, fish tissue residue)			0.3
Nickel4,5, dissolved	[V]CF	[V.A]CF	4600
Selenium, total recoverable	5	20	4200
Silver4,5, dissolved		[VI]CF	65000
Thallium, dissolved			0.47
Zinc4,5, dissolved	[VII]CF	[VII]CF	26000

 

 Notes:

¹ For constituents without numerical criteria, standards have not been developed at this time.  However, the National Pollutant Discharge Elimination System (NPDES) permitting authority shall address constituents without numerical standards in NPDES permit actions by using the narrative criteria for toxics contained in these water quality standards.

 

² The Class D Human Health Criteria for metals will be based on Total Recoverable metals.

 

³ The letter “c” after the Class D Human Health Criteria numeric value means that the criteria is based on carcinogenicity of 10^-6 risk level.

 

⁴ The superscript “CF” means that the criterion derived from the formula under Note 5 is multiplied by the conversion factor in Table 2a as specified in Subsection 1105.10:

 

 TABLE 2A. CONVERSION FACTORS

 

Constituent	CCC	CMC
Cadmium	1.101672-[(ln hardness)(0.041838)]	1.136672-[(ln hardness)(0.041838)]
Chromium III	0.860	0.316
Chromium VI	0.962	0.982
Copper	0.960	0.960
Lead	1.46203-[(ln hardness)(0.145712)]	1.46203-[(ln hardness)(0.145712)]
Mercury	0.85	0.85
Nickel	0.997	0.998
Silver	--	0.85
Zinc	0.986	0.978

 

⁵ The formulas for calculating the criterion for the hardness dependent constituents indicated above are as follows:

 

[I]        The numerical CCC criterion for cadmium in μg/L shall be given by:

e^{(0.7409[ln(hardness)]‑4.719)}

 

[I.A]    The numerical CMC criterion for cadmium in μg/L shall be given by:

e^{(1.0166[ln(hardness)]‑3.924)}

 

[II]       The numerical CCC criterion for trivalent chromium in μg/L shall be given by:

                                                            e^{(0.8190[ln(hardness)]+0.6848)}

 

[II.A]   The numerical CMC criterion for trivalent chromium in μg/L shall be given by:

                                                            e^{(0.8190[ln(hardness)]+3.7256)}

 

[III]     The numerical CCC criterion for copper in μg/L shall be given by:

e^{(0.8545[ln(hardness)]‑1.702)}

 

[III.A] The numerical CMC criterion for copper in μg/L shall be given by:

e^{(0.9422[ln(hardness)]‑1.700)}

 

[IV]     The numerical CCC criterion for lead in μg/L shall be given by:

e^{(1.2730[ln(hardness)]‑4.705)}

 

[IV.A] The numerical CMC criterion for lead in μg/L shall be given by:

e^{(1.2730[ln(hardness)]‑1.460)}

 

[V]       The numerical CCC criterion for nickel in μg/L shall be given by:

e^{(0.8460[ln(hardness)]+0.0584)}

 

[V.A]   The numerical CMC criterion for nickel in μg/L shall be given by:

e^{(0.8460[ln(hardness)]+2.255)}

 

[VI]     The numerical CMC criterion for silver in μg/L shall be given by:

e^{(1.7200[ln(hardness)]-6.590)}

 

[VII]    The numerical CCC criterion for zinc in μg/L shall be given by:

e^{(0.8473[ln(hardness)]+0.884)}

 

[VII.A] The numerical CMC criterion for zinc in μg/L shall be given by:

e^{(0.8473[ln(hardness)]+0.884)}

               

⁶ Hardness in the equations (I) through (VII.A) in Note 5 above shall be measured as mg/L of Calcium Carbonate (CaCO₃).   The minimum hardness allowed for use in those equations shall not be less than 25 mg/L, as CaCO₃, even if the actual ambient hardness is less than 25 mg/L as CaCO₃.  The maximum hardness value allowed for use in those equations shall not exceed 400 mg/L, as CaCO₃, even if the actual ambient water hardness is greater than 400 mg/L as CaCO₃.  

 

⁷Criterion Continuous Concentration (CCC) for Total Ammonia:

 

(a)                   The CCC criterion for ammonia (in mg N/L) (i) shall be the thirty (30)-day average concentration for total ammonia computed for a design flow specified in Subsection 1105.5; and (ii) shall account for the influence of the pH and temperature as shown in Table 2b and Table 2c.  The highest four (4)-day average within the thirty (30)-day period shall not exceed 2.5 times the CCC.

 

(b)               The CCC criterion in Table 2b for the period March 1^st through June 30^th was calculated using the following formula, which shall be used to calculate unlisted values: CCC = [(0.0577/(1+10^7.688-pH)) + (2.487/(1+ 10^pH-7.688))] X MIN(2.85, 1.45 X 10^{0.028 X (25-T)})], where MIN indicates the lesser of the two values (2.85, 1.45 X 10^{0.028 X (25-T)}) separated by a comma. 

 

(c)                The CCC criterion in Table 2c for the period July 1^st through February 28/29^th, was calculated using the following formula, which shall be used to calculate unlisted values: CCC = [(0.0577/(1+10^7.688-pH)) + (2.487/(1+ 10^pH-7.688))] X [1.45 X 10^{0.028 X  (25-MAX(T,7)}], where MAX indicates the greater of the two values (T,7) separated by a comma.

 

TABLE 2B. TOTAL AMMONIA
(in milligrams of Nitrogen per liter)
CCC CRITERION FOR VARIOUS pH AND TEMPERATURES
FOR MARCH 1^ST THROUGH JUNE 30^TH

 

	Temperature (°C)
pH	0	14	16	18	20	22	24	26	28	30
6.50	6. 67	6.67	6.06	5.33	4.68	4.12	3.62	3.18	2.80	2.46
6.60	6.57	6.57	5.97	5.25	4.61	4.05	3.56	3.13	2.75	2.42
6.70	6.44	6.44	5.86	5.15	4.52	3.98	3.42	3.00	2.64	2.32
6.80	6.29	6.29	5.72	5.03	4.42	3.89	3.42	3.00	2.64	2.32
6.90	6.12	6.12	5.56	4.89	4.30	3.78	3.32	2.92	2.57	2.25
7.00	5.91	5.91	5.37	4.72	4.15	3.65	3.21	2.82	2.48	2.18
7.10	5.67	5.67	5.15	4.53	3.98	3.50	3.08	2.70	2.38	2.09
7.20	5.39	5.39	4.90	4.31	3.78	3.33	2.92	2.57	2.26	1.99
7.30	5.08	5.08	4.61	4.06	3.57	3.13	2.76	2.42	2.13	1.87
7.40	4.73	4.73	4.30	3.97	3.49	3.06	2.69	2.37	2.08	1.83
7.50	4.36	4.36	3.97	3.49	3.06	2.69	2.37	2.08	1.83	1.61
7.60	3.98	3.98	3.61	3.18	2.79	2.45	2.16	1.90	1.67	1.47
7.70	3.58	3.58	3.25	2.86	2.51	2.21	1.94	1.71	1.50	1.32
7.80	3.18	3.18	2.89	2.54	2.23	1.96	1.73	1.52	1.33	1.17
7.90	2.80	2.80	2.54	2.24	1.96	1.73	1.52	1.33	1.17	1.03
8.00	2.43	2.43	2.21	1.94	1.71	1.50	1.32	1.16	1.02	0.897
8.10	2.10	2.10	1.91	1.68	1.47	1.29	1.14	1.00	0.879	0.773
8.20	1.79	1.79	1.63	1.43	1.26	1.11	0.973	0.855	0.752	0.661
8.30	1.52	1.52	1.39	1.22	1.07	0.941	0.827	0.727	0.639	0.562
8.40	1.29	1.29	1.17	1.03	0.906	0.796	0.700	0.615	0.541	0.475
8.50	1.09	1.09	0.990	0.870	0.765	0.672	0.591	0.520	0.457	0.401
8.60	0.920	0.920	0.836	0.735	0.646	0.568	0.499	0.439	0.386	0.339
8.70	0.778	0.778	0.707	0.622	0.547	0.480	0.422	0.371	0.326	0.287
8.80	0.661	0.661	0.601	0.528	0.464	0.408	0.359	0.315	0.277	0.208
8.90	0.565	0.565	0.513	0.451	0.397	0.349	0.306	0.269	0.237	0.208
9.00	0.486	0.486	0.442	0.389	0.342	0.300	0.264	0.232	0.204	0.179

           

 

TABLE 2C. TOTAL AMMONIA
(milligrams of Nitrogen per liter)

CCC CRITERION FOR VARIOUS pH AND TEMPERATURES FOR JULY 1^ST THROUGH FEBRUARY 28^TH/29^TH

 

	Temperature (°C)
pH	0-7	8	9	10	11	12	13	14	15*	16*
6.50	10.8	10.1	9.51	8.92	8.36	7.84	7.35	6.89	6.46	6.06
6.60	10.7	9.99	9.37	8.79	8.24	7.72	7.24	6.79	6.36	5.97
6.70	10.5	9.81	9.20	8.62	8.08	7.58	7.11	6.66	6.25	5.86
6.80	10.2	9.58	8.98	8.42	7.90	7.40	6.94	6.51	6.10	5.72
6.90	9.93	9.31	8.73	8.19	7.68	7.20	6.75	6.33	5.93	5.56
7.00	9.60	9.00	8.43	7.91	7.41	6.95	6.52	6.11	5.73	5.37
7.10	9.20	8.63	8.09	7.58	7.11	6.67	6.25	5.86	5.49	5.15
7.20	8.75	8.20	7.69	7.21	6.76	6.34	5.94	5.57	5.22	4.90
7.30	8.24	7.73	7.25	6.79	6.37	5.97	5.60	5.25	4.92	4.61
7.40	7.69	7.21	6.76	6.33	5.94	5.57	5.22	4.89	4.59	4.30
7.50	7.09	6.64	6.23	5.84	5.48	5.13	4.81	4.51	4.23	3.97
7.60	6.46	6.05	5.67	5.32	4.99	4.68	4.38	4.11	3.85	3.61
7.70	5.81	5.45	5.11	4.79	4.49	4.21	3.95	3.70	3.47	3.25
7.80	5.17	4.84	4.54	4.26	3.99	3.74	3.51	3.29	3.09	2.89
7.90	4.54	4.26	3.99	3.74	3.51	3.29	3.09	2.89	2.71	2.54
8.00	3.95	3.70	3.47	3.26	3.05	2.86	2.68	2.52	2.36	2.21
8.10	3.41	3.19	2.99	2.81	2.63	2.47	2.31	2.17	2.03	1.91
8.20	2.91	2.73	2.56	2.4	2.25	2.11	1.98	1.85	1.74	1.63
8.30	2.47	2.32	2.18	2.04	1.91	1.79	1.68	1.58	1.48	1.39
8.40	2.09	1.96	1.84	1.73	1.62	1.52	1.42	1.33	1.25	1.17
8.50	1.77	1.66	1.55	1.46	1.37	1.28	1.20	1.13	1.06	0.990
8.60	1.49	1.40	1.31	1.23	1.15	1.08	1.01	0.951	0.892	0.836
8.70	1.26	1.18	1.11	1.04	0.976	0.915	0.858	0.805	0.754	0.707
8.80	1.07	1.01	0.944	0.885	0.829	0.778	0.729	0.684	0.641	0.601
8.90	0.917	0.860	0.806	0.756	0.709	0.664	0.623	0.584	0.548	0.513
9.00	0.790	0.740	0.694	0.651	0.610	0.572	0.536	0.503	0.471	0.442

 *At 15°C and above, the criterion for July 1^st through February 28^th/29^th is the same as the criterion for March 1^st through June 30^th.

 

⁸ Criterion Maximum Concentration (CMC) for Total Ammonia:   

 

(a)        The CMC criterion for total ammonia (in mg N/L) (i) shall be the one (1)-hour average concentration for total ammonia, computed for a design flow specified in subsection 1105.5; and (ii) shall account for the influence of the pH as shown in Table 2d. 

 

(b)        The CMC criterion was calculated using the following formula, which shall be used to calculate unlisted values: CMC = [(0.411/(1+10^7.204-pH)] + [58.4/(1+ 10^pH-7.204)].

 

TABLE 2D. TOTAL AMMONIA

(in milligrams of Nitrogen per liter)
CMC CRITERION FOR VARIOUS pH

 

pH	CMC	pH	CMC	pH	CMC	pH	CMC
6.50	48.8	7.20	29.5	7.90	10.1	8.60	2.65
6.60	46.8	7.30	26.2	8.00	8.40	8.70	2.20
6.70	44.6	7.40	23.0	8.10	6.95	8.80	1.84
6.80	42.0	7.50	19.9	8.20	5.72	8.90	1.56
6.90	39.1	7.60	17.0	8.30	4.71	9.00	1.32
7.00	36.1	7.70	14.4	8.40	3.88
7.10	32.8	7.80	12.1	8.50	3.20

 

 

TABLE 3 – ORGANIC COMPOUNDS
Constituent1   Organics (μg/L)		CAS Number	Criteria for Classes
			C		D2
			CCC 4-Day Avg	CMC 1-Hour Avg	30-Day Avg
Acrolein		107028	3.0	3.0	9.0
Acrylonitrile		107131	700.0		0.25,c
Aldrin		309002	0.4	3.0	0.000050,c
Benzene		71432	1000		51.0,c
Carbon Tetrachloride		56235	1000		1.6,c
Chlordane		57749	0.0043	2.4	0.00081,c
Chlorinated benzenes (except Di)			25.0
	Chlorobenzene	108907			1600
	1,2-Dichlorobenzene	95501	200		1300
	1,3-Dichlorobenzene	541731	200		960
	1,4-Dichlorobenzene	106467	200		190
	Hexachlorobenzene	118741			0.00029,c
	Pentachlorobenzene	608935			1.5
	1,2,4,5-Tertrachlorobenzene	95943			1.1
	1,2,4-Trichlorobenzene	120821			70
Chlorinated ethanes			50
	1,2-Dichloroethane	107062			37.0,c
	Hexachloroethane	67721			3.3,c
	1,1,2,2-Tetrachloroethane	79345			4.0,c
	1,1,2-Trichloroethane	79005			16.0,c
Chlorinated naphthalene
	2-Chloronaphthalene	91587	200		1600
Chlorinated phenols
	2‑Chlorophenol	95578	100		150
	2,4‑Dichlorophenol	120832	200		290.0
	Pentachlorophenol3	87865	[I]	[I.A]	3.0,c
	2,4,5-Trichlorophenol	95954			3600
	2,4,6-Trichlorophenol	88062			2.4,c
Chloroalkyl ethers			1000
	Bis(2-Chloroethyl)Ether	111444			0.53,c
	Bis(2-Chloroisopropyl)Ether	108601			65,000
	Bis(Chloromethyl)Ether	542881			0.00029
3,3-Dichlorobenzidine		91941	10		0.028,c
Dichloroethylenes			1000
	1,1-Dichloroethylene	75354			7,100,c
	1,2-Trans-Dichloroethylene	156605			10,000
1,2-Dichloropropane		78875	2000		15,c
Dichloropropenes			400
	1,3-Dichloropropene	542756			21
Dieldrin		60571	0.056	0.24	0.000054,c
2,4‑Dimethylphenol		105679	200		850
2,4-Dinitrotoluene		121142	33		3.4,c
Dioxin (2,3,7,8-TCDD)		1746016			0.0000000051,c (5.1 E-8)
1,2-Diphenylhydrazine		122667	30		0.20,c
Endosulfan			0.056	0.22	89
	Alpha-Endosulfan	959988	0.056	0.22	89
	Beta-Endosulfan	33213659	0.056	0.22	89
Endosulfan sulfate		1031078			89
Endrin		72208	0.036	0.086	0.060
Endrin aldehyde		7421934			0.30
Ethylbenzene		100414	40		2,100
Halomethanes			1000
	Bromoform	75252			140,c
	Chloroform	67663	3000		470.0,c
	Chlorodibromomethane	124481			13.0,c
	Dichlorobromomethane	75274			17.0,c
	Methyl Bromide	74839			1,500
	Methylene chloride	75092			590,c
Heptachlor		76448	0.0038	0.52	0.000079,c
Heptachlor epoxide		1024573	0.0038	0.52	0.000039,c
Hexachlorobutadiene		87683	10		18.0,c
Hexachlorocyclohexane
	alpha-BHC	319846			0.0049,c
	beta-BHC	319857			0.017,c
	gamma-BHC (Lindane)	58899	0.08	0.95	1.8,c
Hexachlorocyclopentadiene		77474	0.5		1,100
Isophorone		78591	1000		960,c
Manganese		7439965			100
Methoxychlor		72435	0.03
Mirex		2385855	0.001
Naphthalene		91203	600
Nitrobenzene		98953	1000		690
Nitrophenols			20
	2-Methyl-4,6- Dinitrophenol	534521			280
	2,4-Dinitrophenol	51285			5,300
	Dinitrophenols	25550587			5,300
Nitrosamines			600		1.24
	N-Nitrosodibutylamine	924163			0.22
	N-Nitrosodiethylamine	55185			1.24
	N-Nitrosodimethylamine	62759			3.0,c
	N-Nitrosodi-n-Propylamine	621647			0.51,c
	N-Nitrosodiphenylamine	86306			6.0,c
N-Nitrosopyrrolidine		930552			34,c
Nonylphenol		84852153	6.6	28
Carbamates
Carbaryl (Sevin)		63252	2.1	2.1
Organochlorides
	4,4’-DDD	72548	0.001	1.1	0.00031,c
	4,4’-DDE	72559	0.001	1.1	0.00022,c
	4,4’-DDT	50293	0.001	1.1	0.00022,c
Organophosphates
	Guthion	86500	0.01
	Malathion	121755	0.1
	Parathion	56382	0.013	0.065
Phenol		108952			860,000
Phthalate esters			100
	Bis(2-Ethylhexyl) Phthalate	117817			2.2,c
	Butylbenzyl Phthalate	85687			1,900
	Diethyl Phthalate	84662			44,000
	Dimethyl Phthalate	131113			1,100,000
	Di-n-Butyl Phthalate	84742			4,500
Polychlorinated biphenyls4			0.014		0.000064,c
Polynuclear aromatic hydrocarbons
	Acenaphthene	83329	50		990
	Acenaphthylene	208968
	Anthracene	120127			40,000
	Benzidine	92875	250		0.00020,c
	Benzo(a)Anthracene	56553			0.018,c
	Benzo(a)Pyrene	50328			0.018,c
	Benzo(b)Fluoranthene	205992			0.018,c
	Benzo(k)Fluoranthene	207089			0.018,c
	Chrysene	218019			0.018,c
	Dibenzo(a,h) Anthracene	53703			0.018,c
	Fluoranthene	206440	400		140.0
	Fluorene	86737			5,300
	Indeno(1,2,3-cd) Pyrene	193395			0.018,c
	Pyrene	129000			4,000
Tetrachloroethylene		127184	800		3.3,c
Toluene		108883	600		15000
Toxaphene		8001352	0.0002	0.73	0.00028,c
Tributyltin (TBT)		--	0.072	0.46
Trichloroethylene		79016	1000		30.0,c
Vinyl chloride		75014			2.4,c

Notes:

¹ For constituents without numerical criteria, standards have not been developed at this time.  However, permit writers shall address these constituents in NPDES permit actions using the narrative criteria for toxics contained in these water quality standards.

² The letter “c” after the Class D Human Health Criteria numeric value means that the criterion is based on carcinogenicity of 10^-6 risk level.

 

³ The formulas for calculating the concentrations of substances indicated above are as follows:

 

[I]        The numerical CCC criterion for pentachlorophenol in μg/L shall be given by:

e^{(1.005(pH) - 5.134)}

[I.A]    The numerical CMC criterion for pentachlorophenol in μg/L shall be given by:

 e^{(1.005(pH) - 4.869)}

⁴ The polychlorinated biphenyls (PCB) criterion applies to total PCBs (e.g., the sum of all congener or all isomer or homolog or Aroclor analyses.)