R317-6-2. Ground Water Quality Standards

2.1 The following Ground Water Quality Standards as listed in Table I are adopted for protection of ground water quality.

TABLE 1

GROUND WATER QUALITY STANDARDS

Parameter Milligrams per liter

                           (mg/l) unless noted

                           otherwise and based

                           on analysis of

                           filtered sample

                           except for Mercury

                           and organic compounds

PHYSICAL CHARACTERISTICS

Color (units) 15.0

Corrosivity (characteristic) noncorrosive

Odor (threshold number) 3.0

pH (units) 6.5-8.5

INORGANIC CHEMICALS

Bromate 0.01

Chloramine (as Cl₂) 4

Chlorine (as Cl₂) 4

Chlorine Dioxide 0.8

Chlorite 1.0

Cyanide (free) 0.2

Fluoride 4.0

Nitrate (as N) 10.0

Nitrite (as N) 1.0

Total Nitrate/Nitrite (as N) 10.0

METALS

Antimony 0.006

Asbestos (fibers/l and > 10 microns in length) 7.0x10⁶

Arsenic 0.05

Barium 2.0

Beryllium 0.004

Cadmium 0.005

Chromium 0.1

Copper 1.3

Lead 0.015

Mercury 0.002

Selenium 0.05

Silver 0.1

Thallium 0.002

Zinc 5.0

ORGANIC CHEMICALS

Pesticides and PCBs

Alachlor 0.002

Aldicarb 0.003

Aldicarb sulfone 0.002

Aldicarb sulfoxide 0.004

Atrazine 0.003

Carbofuran 0.04

Chlordane 0.002

Dalapon (sodium salt) 0.2

Dibromochloropropane (DBCP) 0.0002

2, 4-D 0.07

Dichlorophenoxyacetic acid (2, 4-) (2,4D) 0.07

Dinoseb 0.007

Diquat 0.02

Endothall 0.1

Endrin 0.002

Ethylene Dibromide (EDB) 0.00005

Glyphosate 0.7

Heptachlor 0.0004

Heptachlor epoxide 0.0002

Lindane 0.0002

Methoxychlor 0.04

Oxamyl (Vydate) 0.2

Pentachlorophenol 0.001

Picloram 0.5

Polychlorinated Biphenyls 0.0005

Simazine 0.004

Toxaphene 0.003

2, 4, 5-TP (Silvex) 0.05

VOLATILE ORGANIC CHEMICALS

Benzene 0.005

Benzo (a) pyrene (PAH) 0.0002

Carbon tetrachloride 0.005

1, 2 - Dichloroethane 0.005

1, 1 - Dichloroethylene 0.007

1, 1, 1-Trichloroethane 0.200

Dichloromethane 0.005

Di (2-ethylhexyl) adipate 0.4

Di (2-ethylhexyl) phthalate 0.006

Dioxin (2,3,7,8-TCDD) 0.00000003

para - Dichlorobenzene 0.075

o-Dichlorobenzene 0.6

cis-1,2 dichloroethylene 0.07

trans-1,2 dichloroethylene 0.1

1,2 Dichloropropane 0.005

Ethylbenzene 0.7

Hexachlorobenzene 0.001

Hexachlorocyclopentadiene 0.05

Monochlorobenzene 0.1

Styrene 0.1

Tetrachloroethylene 0.005

Toluene 1

Trichlorobenzene (1,2,4-) 0.07

Trichloroethane (1,1,1-) 0.2

Trichloroethane (1,1,2-) 0.005

Trichloroethylene 0.005

Vinyl chloride 0.002

Xylenes (Total) 10

OTHER ORGANIC CHEMICALS

Five Haloacetic Acids (HAA5) 0.06

     (Monochloroacetic acid)

     (Dichloroacetic acid)

     (Trichloroacetic acid)

     (Bromoacetic acid)

     (Dibromoacetic acid)

Total Trihalomethanes (TTHM) 0.08

RADIONUCLIDES

     The following are the maximum contaminant levels for

Radium-226 and Radium-228, and gross alpha particle

radioactivity, beta particle radioactivity, photon

radioactivity, and uranium concentration:

Combined Radium-226 and Radium-228 5pCi/l

Gross alpha particle activity,

including Radium-226 but

excluding Radon and Uranium 15pCi/l

Uranium 0.030 mg/l

Beta particle and photon radioactivity

     The average annual concentration from man-made

radionuclides of beta particle and photon radioactivity

from man-made radionuclides shall not produce an annual

dose equivalent to the total body or any internal organ

greater than four millirem/year.

     Except for the radionuclides listed below, the

concentration of man-made radionuclides causing four

millirem total body or organ dose equivalents shall be

calculated on the basis of a two liter per day drinking

water intake using the 168 hour data listed in "Maximum

Permissible Body Burden and Maximum Permissible Concentration

Exposure", NBS Handbook 69 as amended August 1962, U.S.

Department of Commerce. If two or more radionuclides are

present, the sum of their annual dose equivalent to the total

body or to any organ shall not exceed four millirem/year.

     Average annual concentrations assumed to produce a

total body or organ dose of four millirem/year:

    Radionuclide Critical Organ pCi per liter

     Tritium Total Body 20,000

     Strontium-90 Bone Marrow 8

2.2 A permit specific ground water quality standard for any pollutant not specified in Table 1 may be established by the Director at a level that will protect public health and the environment. This permit limit may be based on U.S. Environmental Protection Agency maximum contaminant level goals, health advisories, risk based contaminant levels, standards established by other regulatory agencies and other relevant information.