N.J. Admin. Code § 7:14A-12.4

Current through Register Vol. 56, No. 21, November 4, 2024

Section 7:14A-12.4 - Minimum BOD[5] effluent standards

(a) For direct discharges to surface water for which BOD[5] or CBOD[5] water quality based effluent limitations based upon water quality studies acceptable to the Department have not been developed but are required under N.J.A.C. 7:9B-1.5 or 1.6, the minimum treatment requirements for BOD[5] specified in (b) below shall apply except when more stringent effluent limitations are required by:

1. Section 301 or 306 of the Federal Act;

2. The Delaware River Basin Commission or the Interstate Environmental Commission, as applicable.

(b) The minimum BOD[5] treatment requirements are as listed in the following table:

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(c) In applying the minimum treatment requirements contained in (b) above, the following substitutions may be made:

1. For industrial treatment works, TOC or COD may be substituted for BOD[5] when a long-term BOD[5]:COD or BOD[5]:TOC correlation has been demonstrated. In the absence of data to establish a long term correlation, the BOD[5]:COD ratio shall be assumed to be 1:2 and the BOD[5]:TOC ratio shall be assumed to be 1:1. If subsequent data are submitted which indicate that a different BOD[5]:COD or BOD[5]:TOC ratio would be more appropriate, a written request shall be submitted to the Department; and

2. For industrial or domestic treatment works, CBOD[5] may be substituted for BOD[5] as follows:

i. With prior approval of each regulatory agency with jurisdiction over the discharge, when applicable, if the effluent standard for BOD[5] is 30/45 mg/L, a CBOD[5] effluent standard of 25/40 mg/L, as allowed for in N.J.A.C. 7:14A-12.2(c)1 and 2, may be substituted; or

ii. With prior approval of each regulatory agency with jurisdiction over the discharge, when applicable, if the effluent standard for BOD[5] is other than 30/45 mg/L, CBOD[5] may be substituted for BOD[5] when a long term BOD[5]:CBOD[5] correlation has been demonstrated. When a request for a substitution of CBOD[5] for BOD[5] is made, the applicant shall submit data demonstrating the appropriate BOD[5]:CBOD[5] correlation. The correlation demonstration shall consist of a minimum of 12 BOD[5] and CBOD[5] analyses of split samples obtained at a frequency of twice per month, subject to the following restrictions:

(1) For limitations applicable year round, or for limitations applicable during warm weather (for example, May through October), the samples shall be obtained during the months of May through October.

(2) For limitations applicable during cold weather (for example, November through April), the samples shall be obtained during the months of November through April.

(3) The monthly and weekly BOD[5] effluent limitations shall be recalculated as CBOD[5] monthly and weekly effluent limitations using the approved correlation factor.

(d) Direct discharges to surface water from industrial treatment works shall be exempt from the minimum BOD[5] effluent standards in (b) above, when:

i. Statistically valid data indicate that the maximum projected BOD[5] concentration is consistently below the applicable effluent standard; or

ii. The Department determines that, based on wastewater generating activities, no potential exists for the discharge to add BOD[5], COD or TOC.

N.J. Admin. Code § 7:14A-12.4

Administrative correction.
See: 29 New Jersey Register 3822(a).
Administrative change.
See: 34 New Jersey Register 1902(a).