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.