The following standards are the allowable pH range and maximum allowable concentration in groundwater of 10,000 mg/L TDS concentration or less for the contaminants specified unless the ambient condition exceeds the standards. Regardless of whether there is one contaminant or more than one contaminant present in groundwater, when the ambient pH or concentration of any water contaminant exceeds the standard specified in this section, the ambient pH or concentration is the allowable limit, provided that the discharge at such concentrations will not result for the present or the reasonably foreseeable future in concentrations at any place of groundwater withdrawal in excess of the standards in this section.

1. (chlorodibromomethane) Trichloroethylene

   79-01-6

   0.005 mg/L

   Vinyl chloride

   75-01-4

   0.002 mg/L

   Xylenes (total)

   1330-20-7

   10 mg/L

   INORGANICS

   Antimony

   7440-36-0

   0.006 mg/L

   Arsenic

   7440-38-2

   0.01 mg/L²

   Asbestos

   1332-21-4

   7 MFL (longerthan10micrometers)

   Barium

   7440-39-3

   2 mg/L

   Beryllium

   7440-41-7

   0.004 mg/L

   Bromate

   7789-38-0

   0.01 mg/L

   Cadmium (Cd)

   7440-43-9

   0.005 mg/L

   Chlorite

   7758-19-2

   1 mg/L

   Chromium

   7440-47-3

   0.1 mg/L

   Copper (Cu)

   7440-50-8

   1.0 mg/L

   Cyanide (CN) as free cyanide

   143-33-9

   0.2 mg/L

   Cyanine (CN) as weak acid dissociable

   143-33-9

   0.75 mg/L

   Fluoride (F)

   7681-49-4

   4 mg/L

   Lead (Pb)

   7439-92-1

   0.015 mg/L

   Mercury (Hg)

   7487-94-7

   0.002 mg/L

   Nitrate (asN)

   14797-55-8

   10 mg/L

   Nitrite (asN)

   14797-65-0

   1 mg/L

   Nitrate + Nitrite (bothasN)

   NA

   10 mg/L

   Selenium

   7782-49-2

   0.05 mg/L

   Silver

   7440-22-4

   0.1 mg/L

   Thallium

   7440-28-0

   0.002 mg/L

   RADIONUCLIDES

   Beta particle and photon radioactivity (from man-made radionuclides)

   NA

   4 mrem/yr

   Gross alpha particle activity, excluding radon and uranium

   NA

   15 pCi/l

   Radium 226 & radium 228 combined

   7440-14-4

   5 pCi/l

   Radon

   10043-92-2

   300 pCi/l

   Uranium

   7440-61-1

   0.03 mg/L

   MICROBIOLOGY

   Fecal coliform bacteria

   NA

   Less than 2.2 organisms per 100 mL (MPN)

   ¹ If Total Petroleum Hydrocarbons is between 0.1 mg/L and 10 mg/L, and is within the radius of influence of a well or within Zone A of a delineated wellhead protection area, clean up must continue until 0.1 mg/L is met. Total petroleum hydrocarbons must be analyzed using the California Department of Health Services Method published in "Leaking Underground Fuel Tank Field Manual: Guidelines for Site Assessment, Cleanup, and Underground Storage Tank Closure," October 1989, or its equivalent.

   ² Ground Water Discharge Plans with permitted allowable limits for arsenic issued before the effective date of these ground water quality standard revisions are exempt.

   Other standards that are not applicable to groundwater receiving discharge from publicly owned treatment works.

   CONTAMINANT

   CAS NUMBER

   CONCENTRATION

   Chloride

   7647-14-5

   250 mg/L

   pH

   NA

   6.5-8.5

   Sulfate

   7757-82-6

   500 mg/L

   TDS

   NA

   1000 mg/L

   If the standards in either table one or table two are exceeded by ambient groundwater quality, the ambient water quality becomes the maximum allowable limit, as determined in § 74:54:02:18, for an approved groundwater discharge plan.

   References:

   Methods and Guidance for the Analysis of Water, Version 2, June 1999; NTIS Order No. PB99-500209, published by the U.S. Environmental Protection Agency. Copies are available on CD-ROM from the National Technical Information Service (NTIS), 5285 Port Royal Road, Springfield, Virginia 22161, 703-605-6000. The cost is $85.

   "Leaking Underground Fuel Tank Field Manual: Guidelines for Site Assessment, Cleanup, and Underground Storage Tank Closure," October 1989, State Water Resources Control Board, P.O. Box 100, Sacramento, CA, 95812, 916-341-5250. Copies of the document are available online at: www.swrcb.ca.gov/general/publications/index.html.

   Cross-References:

   Organic chemicals, § 74:04:05:06.

   Radionuclides, § 74:04:05:17.

   40 C.F.R. § 141.11 (40 FR 59570, December 24, 1975, as amended at 45 FR 57342, August 27, 1980; 47 FR 10998, March 12, 1982; 51 FR 11410, April 2, 1986; 56 FR 30274, July 1, 1991; 56 FR 32113, July 15, 1991; 60 FR 33932, June 29, 1995; 65 FR 26022, May 4, 2000; 66 FR 7061, January 22, 2001).

   40 C.F.R. § 141.12 (63 FR 69463, December 16, 1998, as amended at 66 FR 3776, January 16, 2001).

   40 C.F.R. § 141.24 (40 FR 59570, December 24, 1975, as amended at 44 FR 68641, November 29, 1979; 45 FR 57345, August 27, 1980; 47 FR 10998, March 12, 1982; 52 FR 25712, July 8, 1987; 53 FR 5147, February 19, 1988; 53 FR 25110, July 1988; 56 FR 3583, January 30, 1991; 56 FR 30277, July 1, 1991; 57 FR 22178, May 27, 1992; 57 FR 31841, July 17, 1992; 59 FR 34323, July 1, 1994; 59 FR 62468, December 5, 1994; 60 FR 34085, June 29, 1995; 64 FR 67464, December 1, 1999; 65 FR 26022, May 4, 2000; 67 FR 65250, October 23, 2002; 67 FR 65898, October 29, 2002).

   40 C.F.R. § 141.60 (56 FR 3593, January 30, 1991, as amended at 57 FR 31846, July 17, 1992; 59 FR 34324, July 1, 1994; 66 FR 7063, January 22, 2001).

   40 C.F.R. § 141.61 (56 FR 3593, January 30, 1991, as amended at 56 FR 30280, July 1, 1991; 57 FR 31846, July 17, 1992; 59 FR 34324, July 1, 1994).

   40 C.F.R. § 141.62 (56 FR 3594, January 30, 1991, as amended at 56 FR 30280, July 1, 1991; 57 FR 31847, July 17, 1992; 59 FR 34325, July 1, 1994; 60 FR 33932, June 29, 1995; 66 FR 7063, January 22, 2001; 68 FR 14506, March 25, 2003).

   40 C.F.R. § 141.63 (54 FR 27566, June 29, 1989; 55 FR 25064, June 19, 1990, as amended at 65 FR 26022, May 4, 2000).

   40 C.F.R. § 141.64 (FR 69465, December 16, 1998, as amended at 66 FR 3776, January 16, 2001).

   40 C.F.R. § 141.66 (65 FR 76748, December 7, 2000).

   40 C.F.R. § 143.3 (44 FR 42198, July 19, 1979, as amended at 51 FR 11412, April 2, 1986; 56 FR 3597, January 30, 1991).

These standards apply to the dissolved portion of the contaminants specified, with the exception of mercury and the organic compounds, using the definition of "dissolved" given in the publication Methods and Guidance for the Analysis of Water, Version 2, June 1999. The standards for mercury and the organic compounds apply to the total unfiltered concentrations of the contaminants.

Groundwater must meet the standards listed as follows unless otherwise provided by chapters 74:54:01 and 74:54:02:

Human Health Standards

CONTAMINANT

CAS NUMBER

CONCENTRATION

ORGANICS

Alachlor

15972-60-8

0.002 mg/L

Aldicarb

116-06-3

0.003 mg/L

Aldicarb Sulfone

1646-87-4

0.002 mg/L

Aldicarb Sulfoxide

1646-87-3

0.004 mg/L

Atrazine

1912-24-9

0.003 mg/L

Benzene

71-43-2

0.005 mg/L

Benzo[a]pyrene

50-32-8

0.0002 mg/L

Cabofuran

1563-66-2

0.04 mg/L

Carbon tetrachloride

56-23-5

0.005 mg/L

Chlordane

57-74-9

0.002 mg/L

2,4-D (2,4-dichlorophenoxyacetic acid)

94-75-7

0.07 mg/L

Dalapon (sodiumsalt)

75-99-0

0.2 mg/L

Di(2-ethylhexyl)adipate

103-23-1

0.4 mg/L

Di(2-ethylhexyl)phthalate

117-81-7

0.006 mg/L

Dibromochloropropane (DBCP)

96-12-8

0.0002 mg/L

o-Dichlorobenzene

95-50-1

0.6 mg/L

p-Dichlorobenzene

106-46-7

0.075 mg/L

1,2-Dichloroethane

107-06-2

0.005 mg/L

1,1-Dichloroethylene

75-35-4

0.007 mg/L

cis 1,2-Dichloroethylene

156-59-2

0.07 mg/L

trans 1,2-Dichloroethylene

156-60-5

0.1 mg/L

Dichloromethane (Methylenechloride)

75-09-2

0.005 mg/L

1,2 Dichloropropane

78-87-5

0.005 mg/L

Dinoseb

88-85-7

0.007 mg/L

Diquat

85-00-7

0.02 mg/L

Endothall

145-73-3

0.1 mg/L

Endrin

72-20-8

0.002 mg/L

Ethylbenzene

100-41-4

0.7 mg/L

Ethylene dibromide (EDB)

106-93-4

0.00005 mg/L

Glyphosate

1071-53-6

0.7 mg/L

Heptachlor

76-44-8

0.0004 mg/L

Heptachlor epoxide

1024-57-3

0.0002 mg/L

Hexachlorobenzene

188-74-1

0.001 mg/L

Hexachlorocyclopentadiene

77-47-4

0.05 mg/L

Total Haloacetic Acids, including:

Dichloroacetic acid

76-43-6

Monochloroacetic acid

79-11-8

0.06 mg/L

Trichloroacetic acid

76-03-9

Lindane

58-89-9

0.0002 mg/L

Methoxychlor

72-43-5

0.04 mg/L

Monochlorobenzene

108-90-7

0.1 mg/L

Oxamyl (Vydate)

23135-22-0

0.2 mg/L

Pentachlorophenol

87-86-5

0.001 mg/L

Picloram

1918-02-1

0.5 mg/L

Polychlorinated biphenyls (PCBs)

1336-36-3

0.0005 mg/L

Simazine

122-34-9

0.004 mg/L

Styrene

100-42-5

0.1 mg/L

2,3,7,8-TCDD (Dioxin)

1746-01-6

0.00000003 mg/L

(3 x 10^-8 mg/L)

Tetrachloroethylene (PCE)

127-18-4

0.005 mg/L

Toluene

108-88-3

1 mg/L

Total petroleum hydrocarbons

NA

10 mg/L¹

Toxaphene

8001-35-2

0.003 mg/L

2,4,5-TP Silvex

93-72-1

0.05 mg/L

1,2,4-Trichlorobenzene

120-82-1

0.07 mg/L

1,1,1-Trichloroethane

71-55-6

0.2 mg/L

1,1,2-Trichloroethane

79-00-5

0.005 mg/L

Total trihalomethanes, including:

bromodichloromethane,

75-27-4

bromoform (tribromomethane),

75-25-2

0.08 mg/L

chloroform (trichloromethane),

67-66-3

and dibromochloromethane

124-48-1

Source: 14 SDR 86, effective December 24, 1987; 18 SDR 128, effective February 11, 1992; transferred from § 74:03:15:03, July 1, 1996; 31 SDR 62, effective November 7, 2004.

General Authority: SDCL 34A-2-11.

Law Implemented: SDCL 34A-2-10 , 34A-2-11.