New Jersey Administrative Code
Title 7 - ENVIRONMENTAL PROTECTION
Chapter 14A - NEW JERSEY POLLUTANT DISCHARGE ELIMINATION SYSTEM
Subchapter 13 - EFFLUENT LIMITATIONS FOR DSW PERMITS
Section 7:14A-13.8 - Calculation of effluent limitations using existing effluent quality
Universal Citation: NJ Admin Code 7:14A-13.8
Current through Register Vol. 56, No. 18, September 16, 2024
(a) Effluent limitations based on existing effluent quality shall be calculated according to the following procedure:
1. The maximum projected effluent
concentration shall be calculated in accordance with the statistical method
contained in the USEPA TSD, as amended and/or supplemented, unless the permittee
demonstrates that the method in the TSD is not applicable and that an alternative
statistical method more accurately estimates the maximum projected effluent
concentrations.
i. The following conditions apply:
(1) If at least 10 data points are available, a
site specific coefficient of variation shall be determined.
(2) If fewer than 10 data points are available,
the permit shall require monitoring and include a reopener clause to include
existing effluent quality limitations based on 10 or more data points.
(3) The 95 percent confidence interval and the 95
percent probability basis shall be used.
ii. Effluent data generated during a documented
facility upset, or other unusual event which has been identified and appropriately
remedied by the permittee, may be eliminated when determining effluent limitations
based on existing effluent quality;
2. The maximum daily limitation shall be set equal
to the maximum projected effluent concentration; and
3. The average monthly limitation shall be
calculated from the maximum daily limitation according to the procedure described in
7:14A-13.6, using the sampling frequency
required in the discharge permit. If the required sampling frequency is once per
month or less, an average monthly limitation may be eliminated for that pollutant or
pollutant parameter.
(b) Where an interim effluent limitation is required in accordance with 7:14A-13.11 for the time period prior to the effective date of a final effluent limitation, limitations reflecting existing effluent quality shall be calculated in accordance with (a) above.
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