23-18 Request for Amendment of Local Standard Regulations in the South Bend Municipal Code

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of the following daily maximum discharge limitations: [0.00019) mg/L total mercury. (3) The Director may, at the Director's sole discretion, implement local limits through allocation of the Daily Maximum Allowable Industrial Load (MAIL) and the Monthly MAIL to Significant Industrial Users. The Daily MAIL is the total daily loading of a pollutant available to be allocated to all Significant Industrial Users. The Monthly MAIL is the total loading of a pollutant available to be allocated to all Significant Industrial Users as a monthly average. The monthly age is calculated as the sum of the concentrations of all daily discharges measured during a calendar month divided by the number of daily discharges measured that month. Daily MAILs and Monthly MAILs for the following pollutants are hereby incorporated by reference: Arsenic c Cadmium c Chromium Copper c Cyanide 1 Lead n Nickel s Silver z Zinc (4) Significant Industrial Users (SIU) who have not been given an allocation for one of the pollutants listed above shall notify the City of South Bend at least 90 days in advance of a change in the characteristics of their wastewater that would increase the expected concentration of that pollutant in their wastewater discharge. In addition, the City may determine at any time that an SIU wastewater discharge requires a limitation for a pollutant, regardless of the concentration levels listed below, and may then develop a limit based on the MAIL. In any case, SIU discharge that is found to contain in excess of the following concentrations will be reviewed for the need for a limit. The Director may require more sensitive analysis when results are reported as less than the following concentrations or less than greater concentrations: Arsenic-0.2 mg/L Cadmium-0.1 mg/L Chromium-2.0 mg/L Copper-0.3 mg/L Lead-0.3 mg/L