Indiana Administrative Code
Title 327 - WATER POLLUTION CONTROL DIVISION
Article 5 - INDUSTRIAL WASTEWATER PRETREATMENT PROGRAMS AND NPDES
Rule 18 - Applicable Pretreatment Standards and Other Pretreatment Requirements
Section 18-6 - Intake water pollutant credits

Universal Citation: 327 IN Admin Code 18-6

Current through September 18, 2024

Authority: IC 13-14-8; IC 13-15-1-2; IC 13-15-2-1; IC 13-18-2; IC 13-18-3

Affected: IC 13-11-2; IC 13-13-5-1; IC 13-18-4

Sec. 6.

Categorical pretreatment standards may be adjusted to reflect the presence of pollutants in the industrial user's intake water in accordance with the following provisions:

(1) An industrial user wishing to obtain a credit for intake pollutants must file an application with the control authority. Upon request of the industrial user, the applicable categorical standard shall be calculated on a net basis, meaning that it shall be adjusted to reflect credit for pollutants in the intake water if the:

(A) applicable categorical pretreatment standards contained in 40 CFR Subchapter N specifically provide that they shall be applied on a net basis; or

(B) industrial user demonstrates that the control system it proposes or uses to meet applicable categorical pretreatment standards would, if properly installed and operated, meet the standards in the absence of pollutants in the intake waters.

(2) Credit for generic pollutants, such as:

(A) biochemical oxygen demand;

(B) total suspended solids; and

(C) oil and grease;

should not be granted unless the industrial user demonstrates that the constituents of the generic measure in the user's effluent are substantially similar to the constituents of the generic measure in the intake water or unless appropriate additional limits are placed on process water pollutants either at the outfall or elsewhere.

(3) Credit shall be granted only to the extent necessary to meet the applicable categorical pretreatment standard, up to a maximum value equal to the influent value. Additional monitoring may be necessary to determine eligibility for credits and compliance with standard adjusted under this section.

(4) Credit shall be granted only if the user demonstrates that the intake water is drawn from the same body of water as that into which the POTW discharges. The control authority may waive this requirement if it finds that no environmental degradation will result.

(5) Adjustments under this section to categorical pretreatment standards otherwise applicable to pollutants in the discharger's effluent shall be calculated as follows:

(A) The amount of pollutants present in the intake water shall be reduced to reflect:
(i) removal of the pollutants by any treatment of the intake water performed by or for the discharger; and

(ii) any further removal of the pollutants by the wastewater treatment technology employed by the discharger.

(B) The amount of the pollutants remaining after the reductions may be applied as an adjustment to the categorical standards otherwise applicable to the pollutants.

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