R317-6-2. Ground Water Quality Standards  


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  • 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.