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-13.15 - Permit averaging periods

1. Limitations on industrial treatment works for conventional, non-conventional, and toxic pollutants shall, unless impracticable, be stated as maximum daily and average monthly discharge limitations;

2. Limitations for conventional and non-conventional pollutants discharged from a DTW shall, unless impracticable, be stated as average weekly and average monthly discharge limitations. Limitations on toxic pollutants discharged from a DTW shall, unless impracticable, be stated as maximum daily and average monthly discharge limitations;

3. Limitations on any pollutant or pollutant parameter where the monitoring frequency is once per month or less may be stated as a maximum daily limitation. Average monthly limitations may also be included on a site specific basis if the Department determines that such limitations are necessary to adequately regulate the discharge of pollutants from the facility;

4. For whole effluent toxicity where the effluent monitoring frequency is once per month or less, the maximum daily effluent limitation shall be stated as the No Observed Adverse Effect Concentration or minimum LC[50] (for acute whole effluent toxicity) or minimum IC[25] (for chronic whole effluent toxicity) and as a maximum acute or chronic toxic units. Average monthly limitations may also be included on a site specific basis if the Department determines that such limitations are necessary to adequately regulate the discharge of pollutants from the facility;

5. For limitations other than water quality based limitations which may be imposed on DTWs, where the average weekly limitation is calculated from the average monthly limitation, or the reverse, the Department may use a factor of 1.5 to calculate the average weekly limitation from the average monthly limitation or, alternatively, may, at the request of the applicant, use the statistical procedures at 7:14A-13.6 to determine the appropriate average weekly limitation; and

6. For intermittent flows, the maximum limitation shall be applicable during periods of actual discharge.