40 CFR Appendix Table 1 to Subpart A of Part 192, Maximum Concentration of Constituents for Groundwater Protection
|Constituent concentration 1||Maximum|
|Nitrate (as N)||10.|
|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|
|Lindane (1,2,3,4,5,6-hexachlorocyclohexane, gamma insomer)||0.004|
|Toxaphene (C10 H10 Cl6, technical chlorinated camphene, 67-69 percent chlorine)||0.005|
|2,4-D (2,4-dichlorophenoxyacetic acid)||0.1|
|2,4,5-TP Silvex (2,4,5-trichlorophenoxypropionic acid)||0.01|
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.