Rules & Regulations of the State of Tennessee
Title 0400 - Environment and Conservation
Subtitle 0400-40 - Water Resources (WPC)
Chapter 0400-40-14 - Pretreatment Requirements
Section 0400-40-14-.15 - NET/GROSS CALCULATION

Universal Citation: TN Comp Rules and Regs 0400-40-14-.15

Current through September 24, 2024

(1) Application.

Categorical Pretreatment Standards may be adjusted to reflect the presence of pollutants in the Industrial User's intake water in accordance with this rule. Any Industrial User wishing to obtain credit for intake pollutants must make application to the Control Authority. Upon request of the Industrial User, the applicable Standard will be calculated on a "net" basis (i.e., adjusted to reflect credit for pollutants in the intake water) if the requirements of paragraph (2) of this rule are met.

(2) Criteria.

(a) Either:
1. The applicable categorical Pretreatment Standards contained in 40 CFR Chapter I, subchapter N specifically provide that they shall be applied on a net basis; or

2. The 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.

(b) Credit for generic pollutants such as biochemical oxygen demand (BOD), total suspended solids (TSS), and 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.

(c) Credit shall be granted only to the extent necessary to meet the applicable categorical Pretreatment Standard(s), up to a maximum value equal to the influent value. Additional monitoring may be necessary to determine eligibility for credits and compliance with Standard(s) adjusted under this rule.

(d) 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 WWF discharges. The Control Authority may waive this requirement if it finds that no environmental degradation will result.

Authority: T.C.A. §§ 69-3-101 et seq. and 4-5-201 et seq.

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