Section NR 257.04 - Monitoring and reporting requirementsThe following special monitoring and reporting requirements apply to all facilities subject to this chapter:
(1) Analyses for cyanide are not required when both of the following conditions are met: (a) The first wastewater sample of the calendar year has been analyzed and found to contain less than 0.07 mg/1.(b) The owner or operator of the aluminum forming facility certifies in writing to the department or control authority that cyanide is not and will not be used in the aluminum forming process.(2) As an alternative pretreatment monitoring procedure, the POTW user may measure and limit oil and grease to the levels shown in the pretreatment standards in lieu of measuring and regulating TTO.(3) Compliance with the maximum monthly average effluent limitations and pretreatment standards is required regardless of the number of samples analyzed and averaged. The maximum monthly average effluent limitations and pretreatment standards shall be the basis for monthly average discharge limits in direct discharge permits and for pretreatment standards.Wis. Admin. Code Department of Natural Resources NR 257.04
Cr. Register, November, 1989, No. 407, eff. 12-1-89.