18 AAC 83.555 - Adjustments in calculating effluent limitations

(a) Except as provided in (b) of this section, when part of a discharger's process wastewater is not being discharged into waters of the United States or contiguous zone because it is disposed into a well, into a POTW, or by land application, thereby reducing the flow or level of pollutants discharged into waters of the United States, the department will adjust the applicable effluent standards and limitations for the discharge in an APDES permit to reflect the reduced raw waste resulting from the disposal. The department will calculate the effluent limitations and standards in the permit by one of the following methods:
(1) if none of the waste from a particular process is discharged into waters of the United States, and effluent limitations guidelines provide a separate allocation for wastes from that process, the department will eliminate any allocation for the process from calculation of permit effluent limitations or standards;
(2) in any case where (a)(1) of this subsection does not apply, the department will adjust effluent limitations by multiplying the effluent limitation derived by applying effluent limitations guidelines to the total waste stream by the amount of wastewater flow to be treated and discharged into waters of the United States, and dividing the result by the total wastewater flow; effluent limitations and standards calculated in this manner may be further adjusted under 40 C.F.R. 125.30 - 125.32, adopted by reference in 18 AAC 83.010, to make them more or less stringent if discharge to a well, POTW, or by land application changes the character or treatability of the pollutants being discharged to receiving waters; this method may be algebraically expressed as:

P = E x N



P = the permit effluent limitation;

E = the limitation derived by applying effluent guidelines to the total wastestream;

N = the wastewater flow to be treated and discharged to waters of the United States; and

T = the total wastewater flow.

(b) This section does not apply if any adopted effluent limitation guideline
(1) controls concentrations of pollutants discharged but not mass; or
(2) specifies a different specific technique for adjusting effluent limitations to account for well injection, land application, or disposal into POTWs.
(c) This section does not alter a discharger's obligation to meet any more stringent requirements established under this chapter.
18 AAC 83.555
Eff. 7/29/2006, Register 179

Authority:AS 44.46.020

AS 46.03.010

AS 46.03.020

AS 46.03.050

AS 46.03.100

AS 46.03.110


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