§ 55.023 SLUG DISCHARGES.

   (A)   General. For purposes of this chapter, the terms “SLUG”, “SLUG LOAD”, “SLUG LOADING” and “SLUG DISCHARGE” shall refer to any discharge meeting at least one of the following criteria:

      (1)   Any discharge of a non-routine, episodic nature, including but not limited to an accidental spill or a non-customary batch discharge, which has a reasonable potential to cause interference or pass through, or in any other way violate the POTW’s NPDES permit conditions;

      (2)   Any discharge at a flow rate or concentration, which could cause a violation of the prohibited discharge standards in § 55.016.

      (3)   Any discharge which exceeds, in either concentration or loading of any constituent, or in quantity of flow, any of the following criteria:

         (a)   A value equal to or greater than the average 24-hour concentration (in milligrams per liter) for a given constituent multiplied by a factor of five. The average 24-hour concentration value shall be calculated using all available data (representative of normal operation) from the most recent six-month period prior to the suspected slug discharge.

         (b)   A value equal to or greater than the average 24-hour loading (in pounds per day) for a given constituent multiplied by a factor of five. The average 24-hour loading value shall be calculated using all available data (representative of normal operation) from the most recent six-month period prior to the suspected slug discharge.

         (c)   A value equal to or greater than the average 24-hour discharge flow (in million-gallons per day) multiplied by a factor of five. The average 24-hour discharge flow value shall be calculated using all available data (representative of normal operation) from the most recent six-month period prior to the suspected slug discharge.

   (B)   Prohibition. Slug discharges as defined in division (A) above are prohibited, and shall constitute a violation of this chapter.

   (C)   Reporting. Known or suspected slug discharges shall be reported in accordance with the requirements of §§ 55.195 through 55.197.

   (D)   Slug discharge control plan. The Superintendent may require the development of a slug discharge control plan per the requirements of § 55.137.

(Ord. 6619, passed 1-28-13)