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Pg. 7 (c) Discharge of wastes having a B.O.D. concentration in excess of 800 parts per million or a suspended solids concentration in excess of • 700 parts per million shall not be permitted, and is hereby prohibited. SECTION 24-17. Permits and agreements for non-confrming discharges. Notwithstanding the provisions of §§24-13 through 24-16 any person may apply to the director of Public Works for a permit under §24-19 to discharge waste into the sanitary sewer system, which is of an unusual or otherwise prohibited strength or character. Such permit shall be granted by the director only upon execution by such person of an agreement, approved by the Rivanna Water and Sewer Authority setting forth the conditions, pretreatment or other limitations required to enable such wastes to be safely accepted into the system. SECTION 24-18. Rate and volume of discharge of industrial waste. Slug discharge or batch dumping of industrial waste is prohibited. Any person now discharging or proposinq to discharge industrial waste into the sanitary sewer system shall provide, at his own expense, a holding tank or holding tanks from which such waste shall be discharged at a uniform rate of flow over a twenty-four hour period. The requirement for a holding tank shall be waived by the director of Public Works provided that: (1) the total daily waste flow from the establishment of such person does •not exceed 50,000 gallons and the maximum rate of discharge is not greater than 1/3 of the capacity (with respect to rate -of -flow) of the sewer receiving the waste, and provided further that the receiving sewer has capacity for handling the maximum rate of industrial waste discharge from the establishment plus the maximum rate of waste flow from other contributors in the area tributary to the receiving sewer; or (2) the maximum rate of discharge from the establishment does not exceed 2.75 times the average rate of discharge as if taken over a twenty-four hour period, and such maximum rate of discharge is not greater than 1/3 of the capacity (with respect to rate -of -flow) of the sewer receiving the waste, and provided further that the receiving sewer has capacity for handling the maximum rate of industrial waste discharge from the establishment plus the maximum rate of waste flow from other contributors in the area tributary to the receiving sewer; and in addition (3) the character of the waste is such that pretreatment with attendant safety holding facilities is not required, and (4) in all other respects, the discharge of such waste is in full compliance with this article. SECTION 24-19. Permits for discharges; pretreatment; restrictions. (a) Any person now discharging, or desiring to discharge, industrial waste or pollutants into the sanitary sewer system shall make application for a permit to the Department of Public Works. Such application shall •include a complete chemical analysis of the waste being discharged or proposed to be discharged, including concentration of B.O.D. and