40 CFR Table 1 to Subpart A of Part 192: 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 (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.