- Table 1 to Subpart A of Part 192—Maximum Concentration of Constituents for Groundwater Protection
| Constituent concentration 1 | Maximum | Arsenic | 0.05 | Barium | 1.0 | Cadmium | 0.01 | Chromium | 0.05 | Lead | 0.05 | Mercury | 0.002 | Selenium | 0.01 | Silver | 0.05 | Nitrate (as N) | 10. | Molybdenum | 0.1 | Combined radium-226 and radium-228 | 5 pCi/liter | Combined uranium-234 and uranium-238 2 | 30 pCi/liter | Gross alpha-particle activity (excluding radon and uranium) | 15 pCi/liter | Endrin (1,2,3,4,10,10-hexachloro-6,7-exposy-1,4,4a,5,6,7,8,8a-octahydro-1,4-endo,endo-5,8-dimethanonaphthalene) | 0.0002 | Lindane (1,2,3,4,5,6-hexachlorocyclohexane, gamma insomer) | 0.004 | Methoxychlor (1,1,1-trichloro-2,2′-bis(p-methoxyphenylethane)) | 0.1 | Toxaphene (C | 0.005 | 2,4-D (2,4-dichlorophenoxyacetic acid) | 0.1 | 2,4,5-TP Silvex (2,4,5-trichlorophenoxypropionic acid) | 0.01 |
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1 Milligrams per liter, unless stated otherwise.
2 Where secular equilibrium obtains, this criterion will be satisfied by a concentration of 0.044 milligrams per liter (0.044 mg/l). For conditions of other than secular equilibrium, a corresponding value may be derived and applied, based on the measured site-specific ratio of the two isotopes of uranium.