Minnesota Administrative Rules
Agency 167 - Pollution Control Agency
Chapter 7049 - WASTEWATER PRETREATMENT
Part 7049.0480 - NET/GROSS CALCULATION TO ADJUST CATEGORICAL STANDARDS

A. Categorical pretreatment standards may be adjusted to reflect the presence of pollutants in the industrial user's intake water according to this part. An 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 shall be calculated on a net basis, such as being adjusted to reflect credit for pollutants in the intake water, if the applicable categorical pretreatment standard specifically provides that they shall be applied on a net basis or if the industrial user demonstrates that the control system it proposes or uses to meet applicable categorical pretreatment standards will, 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, total suspended solids, and oil and grease shall not be granted unless:

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

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