Ala. Admin. Code r. 335-6-10-.07 Toxic Pollutant Criteria Applicable to State Waters

• Library: Alabama Administrative Code
• Edition: 2023
• Currency: Current through Register Vol. 42, No. 3, December 29, 2023
• Year: 2023
• Citation: Ala. Admin. Code r. 335-6-10-.07

(1) The U.S. Environmental Protection Agency has listed the chemical constituents given in Table 1 as toxic pollutants pursuant to Section 307(a) (1) of the Federal Water Pollution Control Act (FWPCA). Concentrations of these toxic pollutants in State waters shall not exceed the criteria indicated in Table 1 to the extent commensurate with the designated usage of such waters.

(a) The freshwater and marine aquatic life criteria for certain pollutants are dependent on hardness or pH. For these pollutants, the criteria are given by the following equations. In the hardness-dependent equations for metals, a conversion factor converts the total recoverable value to a criterion expressed as the dissolved fraction in the water column. All numeric values listed for metals in Table 1 at the end of this chapter are expressed as dissolved metals unless otherwise noted Click to view image Click to view image Click to view image

(b) The marine aquatic life criteria apply only to coastal waters of the Escatawpa River Basin, coastal waters of the Mobile River - Mobile Bay Basin and coastal waters of the Perdido River Basin, as identified in Rule 335Use Classifications335-6-11-.02 of the Department's regulations. The acute aquatic life criteria apply to all waters of the State. The chronic aquatic life criteria apply only to waters classified Outstanding Alabama Water, Public Water Supply, Swimming and Other Whole Body Water-Contact Sports, Shellfish Harvesting, Fish and Wildlife, and Limited Warmwater Fishery, as identified in Rule 335Use Classifications335-6-11-.02 of the Department's regulations.

(c) For the purpose of establishing effluent limitations pursuant to Chapter 335-6-6 of the Department's regulations, the minimum 7-day low flow that occurs once in 10 years (7Qio) shall be the basis for applying the chronic aquatic life criteria, except as noted in Rule 335Specific Water Quality Criteria335-6-10-.09(6) and the minimum 1-day low flow that occurs once in 10 years (lQio) shall be the basis for applying the acute aquatic life criteria, except as noted in Rule 335Specific Water Quality Criteria335-6-10-.09(7)(c)(5) Where a permit specifies a minimum flow greater than lQio, the specified minimum flow may be used as the basis for applying the acute and chronic...